BACKGROUND ART An organic light-emitting device is a device in which a thin film containing a fluorescent organic compound is sandwiched between an anode and a cathode.

In the device produces, an exciton of the fluorescent compound is produced by injecting an electron or a hole from each of the electrodes and the light radiated when the exciton returns to the ground state is utilized.

In a research by Eastman Kodak Company in 1987 (Appl. Phys. Lett. 51,913 (1987) ), there is reported a light emission of about 1,000 cd/m2 at an applied voltage of about 10 V for a device of separated- function two-layered structure using ITO for anode, a magnesium-silver alloy for cathode, respectively, an aluminum-quinolinol complex as an electron-

transporting material, and a light-emitting material and a triphenylamine derivative as a hole transporting material. Related patents include U. S.

Patent No. 4,539, 507; U. S. Patent No. 4,720, 432 and U. S. Patent No. 4,885, 211.

Light-emission from ultraviolet to infrared is possible by changing a kind of the fluorescent organic compounds and researches of various compounds therefor have been conducted actively recently. For example, they are described in U. S. Patent No.

5,151, 629 ; U. S. Patent No. 5,409, 783; U. S. Patent No.

5,382, 477; Japanese Patent Application Laid-Open No.

H02-247278; Japanese Patent Application Laid-Open No.

H03-255190; Japanese Patent Application Laid-Open No.

H05-202356; Japanese Patent Application Laid-Open No.

H09-202878 and Japanese Patent Application Laid-Open No. H09-227576.

Besides other than the organic light-emitting device using monomeric materials as described above, an organic light-emitting device using a conjugated polymer has been reported by a group of Cambridge University (Nature 347,539 (1990) ). In this report, the light-emission in a monolayer by forming a film of polyphenylenevinylene in a coating system is confirmed. The related patents on organic light- emitting devices using conjugated polymers include U. S. Patent No. 5,247, 190; U. S. Patent No. 5,514, 878;

U. S. Patent No. 5,672, 678; Japanese Patent Application Laid-Open No. H04-145192 and Japanese Patent Application Laid-Open No. H05-247460.

Thus, recent progress in organic light-emitting devices is remarkable, and possibilities for a wide range of applications are indicated since it is characterized in that a thin and light-weight light- emitting device having high luminance at a low applied-voltage, diversity of light-emitting wavelength and high-speed response can be prepared.

However, there are numbers of problems in terms of durability such as the variation with time during use for a long period of time and the deterioration due to an atmospheric gas containing oxygen or humidity. Moreover, a light output of higher luminance, high conversion efficiency and the emission of blue, green and red light having high color purity are required under present circumstances in terms of applications such as a full-color display.

For example, Japanese Patent Application Laid- Open No. 2001-52868 discloses a diamine compound as a light-emitting material, but any emission of blue light with high color purity (chromaticity coordinates: x, y=0.14-0. 15,0. 09-0.10) is not obtained. Japanese Patent Application Laid-Open No.

Hll-312587 discloses an example using a similar diamino backbone, but any emission of blue light with

high color purity is not obtained.

DISCLOSURE OF THE INVENTION The present invention has been created to solve these problems of prior art, and it is an object of the present invention to provide an organic light- emitting device that exhibits the hue of light emission having extremely high purity and has a light output having high luminance and long life with a high degree of efficiency and further to provide an organic light-emitting device that is easily produced and can be prepared at a relatively low cost.

According to an aspect of the present invention, there is provided an organic light-emitting device comprising a pair of electrodes consisting of an anode and a cathode and an organic compound- containing layer sandwiched between the pair of electrodes, wherein at least one layer of said organic compound-containing layers contains at least one compound selected from the group consisting of compounds represented by general formula [1]: wherein

Y1 and Y3 can be bonded to Y2 and Y4 respectively to form a ring, and Xi and X3 can be bonded to Yi and/or Y2 and Y3 and/or Y4 respectively to form a ring; Xl, X2 and X3 are the same or different and are each independently a direct bond or a divalent group selected from the group consisting of alkylene, aralkylene, arylene, divalent heterocyclic, alkenylene, imino,-SiH2-, silylene, carbonyl, ether and thioether, each having no substituent or a substituent which can include a linking group consisting of arylene or divalent-heterocyclic, each having no substituent or a substituent; Yi to Y4 are the same or different and are each independently a group selected from the group consisting of alkyl, aralkyl, aryl, heterocyclic, amino, silyl, alkylene, aralkylene, alkenylene, imino, -SiH2-, silylene, carbonyl, ether and thioether, each having no substituent or a substituent which can include a linking group consisting of arylene or divalent heterocyclic, each having no substituent or a substitutent ; R1 to Re are the same or different and are each independently hydrogen, halogen or a group selected from the group consisting of alkyl, aralkyl and aryl, each having no substituent or a substitutent; and m+n is an integer from 0 to 10, and at least one compound selected from the group consisting of compounds represented by general formulas [2] to [6]:

wherein Arl to Ar3 are the same or different and are each independently hydrogen or a group selected from the group consisting of aryl, heterocyclic, alkyl and aralkyl, each having no substituent or a substituent; and Rg to R1l are the same or different and are hydrogen, halogen, cyano, a substituted amino or a group selected from the group consisting of alkyl, aralkyl and amino, each having no substituent or a substituent, and; wherein Ar4 to Ar7 are the same or different and are each independently a group selected from the group consisting of aryl and heterocyclic, each having no substituent or a substituent; and R12 and R13 are the same or different and are hydrogen, halogen, cyano, a substituted amino or a group selected from the group consisting of alkyl and aralkyl, each having no substituent or a substituent ;

wherein Ar8 to Arl2 are the same or different and are each independently a group selected from the group consisting of aryl and heterocyclic, each having no substituent or a substituent; and R14 is hydrogen, halogen, cyano, a substituted amino or a group selected from the group consisting of alkyl, aralkyl, aryl and heterocyclic, each having no substituent or a substituent ;

wherein Ar13 to Arl6 are the same or different and are each independently a group selected from the group consisting of aryl and heterocyclic, each having no substituent or a substituent, and any one to three of

Ar13 to Arl6 can be hydrogen or a group selected from the group consisting of alkyl and aralkyl, each having no substituent or a substituent; and R15 to Rig are the same or different and are hydrogen, halogen, cyano, a substituted amino or a group selected from the group consisting of alkyl, aralkyl, aryl and heterocyclic, each having no substituent or a substituent; wherein Rig and R20 are the same or different and are hydrogen or a group selected from the group consisting of alkyl, aralkyl and aryl, each having no substituent or a substituent; any pair of Rl9 combined to their respective fluorene structures are the same or different to each other; any pair of R20 combined to their respective fluorene structures are the same or different to each other; R21 to R24 are hydrogen, halogen, cyano, a substituted silyl or a group selected from the group consisting of alkyl, aralkyl and alkoxy, each having no substituent or a substituent; and p is an integer from 2 to 10.

In the organic light-emitting device of the present invention, the layer that contains the

compound represented by general formula [1] and the compound represented by any of general formulas [2] to [6] is preferably a light-emitting layer.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional view illustrating one example of the organic light-emitting device according to the present invention; Fig. 2 is a sectional view illustrating another example of the organic light-emitting device according to the present invention; Fig. 3 is a sectional view illustrating another example of the organic light-emitting device according to the present invention; Fig. 4 is a sectional view illustrating another example of the organic light-emitting device according to the present invention; Fig. 5 is a sectional view illustrating another example of the organic light-emitting device according to the present invention; and Fig. 6 is a sectional view illustrating another example of the organic light-emitting device according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail.

The compounds represented by the above general formulas [1] to [6] of the present invention will be first described.

The compounds represented by the general formulas [1] to [6] according to the present invention can be used mainly as a material for an organic light-emitting device. In the compound [1], an emission spectrum having a narrower half-value width, that is, the emission having better color purity can be obtained by introducing a relatively rigid structure such as a p-phenylene skeleton into a main molecular chain. Moreover, as the Stokes shift can be suppressed, it is also possible to suppress the transfer of light-emitting wavelength and bring the absorption to a longer wavelength side. When used as a dopant material, it is also possible to use a host material having an emission spectrum at a relatively longer wavelength side. Each of the compounds represented by the general formulas [1] to [6] can be used for both purposes, a dopant material and a host material, in a light-emitting layer, and a device having high color purity, high luminous efficiency and long life can be obtained. In particular, use of the compound represented by the general formula [1] as a dopant material in combination with any compound represented by the general formulas [2] to [6] that is a suitable host

material that easily causes energy transfer allows the emission with high color purity to be maintained and a device having better efficiency to be obtained.

The concentration of the dopant relative to the host material is preferably 0.01 to 50% by weight, more preferably 0.5 to 10% by weight.

Specific examples of the substituents in the above general formulas [1] to [6] are shown below.

Examples of substituted or unsubstituted chain and cyclic alkyl groups include methyl, ethyl, n- propyl, n-butyl, n-hexyl, n-decyl, iso-propyl, iso- butyl, tert-butyl, tert-octyl, trifluoromethyl, cyclohexyl and cyclohexylmethyl, but not limited thereto.

Examples of substituted or unsubstituted aralkyl groups include benzyl and phenetyl, but not limited thereto.

Examples of substituted or unsubstituted aryl groups include phenyl, 4-methylphenyl, 4- methoxyphenyl, 4-ethylphenyl, 4-fluorophenyl, 3,5- dimethylphenyl, triphenylamino, biphenyl, terphenyl, naphthyl, anthracenyl, phenanthrenyl, pyrenyl, tetracenyl, pentacenyl, fluorenyl, triphenylenyl and perylenyl, but not limited thereto.

Examples of substituted or unsubstituted heterocyclic groups include pyrrolyl, pyridyl, bipyridyl, methylpyridyl, terpyrrolyl, thienyl,

terthienyl, propylthienyl, furyl, quinolyl, carbazolyl, oxazolyl, oxadiazolyl, thiazolyl and thiadiazolyl, but not limited thereto.

Examples of substituted or unsubstituted alkylene groups include methylene, ethylene, propylene, iso-propylene, butylene, tert-butylene, hexylene, heptylene, cyclohexylene and cyclohexylmethylene, but not limited thereto.

Examples of substituted or unsubstituted aralkylene groups include benzylene, phenylethylene and phenethylene, but not limited thereto.

Examples of substituted or unsubstituted arylene groups include phenylene, biphenylene, 2, 3, 5, 6-tetrafluorophenylene, 2,5-dimethylphenylene, naphthylene, anthracenylene, phenanthrenylene, tetracenylene, pentacenylene and perylenylene, but not limited thereto.

Examples of substituted or unsubstituted divalent heterocyclic groups include furanylene, pyrrolylene, pyridinylene, terpyridinylene, thiophenylene, terthiophenylene, oxazolylene, thiazolylene and carbazolylene, but not limited thereto.

Examples of substituted or unsubstituted alkenyl groups include vinyl, allyl (2-propenyl), 1- propenyl, iso-propenyl and 2-butenyl, but not limited thereto.

Examples of substituted or unsubstituted amino groups include amino, methylamino, ethylamino, dimethylamino, diethylamino, methylethylamino, benzylamino, methylbenzylamino, dibenzylamino, anilino, diphenylamino, phenyltolylamino, ditolylamino and dianisolylamino, but not limited thereto.

Examples of substituted or unsubstituted carbonyl groups include acetyl, propionyl, isobutylyl, methacryloyl, benzoyl, naphthoyl, anthrayl and toluoyl, but not limited thereto.

Examples of substituted or unsubstituted alkoxy groups include methoxy, ethoxy, propoxy, 2-ethyl- octyloxy, phenoxy, 4-butylphenoxy and benzyloxy, but not limited thereto.

Examples of substituted or unsubstituted sulfide groups include methylsulfide, ethylsulfide, phenylsulfide and 4-methylphenylsulfide, but not limited thereto.

Examples of substituents that may be owned by the above substituents include alkyl groups such as methyl, ethyl, n-propyl, iso-propyl, tert-butyl, octyl, benzyl, phenethyl and the like; alkoxy groups such as aralkyl, methoxy, ethoxy, propoxy, 2-ethyl- octyloxy, phenoxy, 4-butylphenoxy, benzyloxy groups and the like; aryl groups such as phenyl, 4- methylphenyl, 4-ethylphenyl, 3-chlorophenyl, 3,5-

dimethylphenyl, triphenylamino, biphenyl, terphenyl, naphthyl, anthryl, phenanthryl and pyrenyl; heterocyclic groups such as pyridyl, bipyridyl, methylpyridyl, thienyl, terthienyl, propylthienyl, furyl, quinolyl, carbazolyl and N-ethylcarbazolyl; halogen, cyano and nitro, but not limited thereto.

The compounds shown by general formulas [1] to [6] are exemplified by compounds shown by the following formulae [1]-1 to [1]-91, [2]-1 to [2]-15, [3]-1 to [3]-14, [4]-1 to [4]-21, [5]-1 to [5]-14, and [6]-1 to [6] -7, respectively, but limited to them.

Table 1 R1 RS til m, n-"XI X2 X3 Yl Y2 Y3 Y4 R4 R8- 1 0, 0 Single Single Ph Ph Ph Ph bond cl bond Single Single bond bond - Single Single ) < Single Single 4 0, 0--bond bond Ph Ph i. r . . r I bond bond bcnd 6 0, 0-Single Single, Ph Ph bond bond -.- S. ngle t...... SingI. e. L- ! bond bond Single. Single 6 °10 _ 5i gle X sia L-Ph @ Ph @ 7 0, 0 _ _ Single 4 Single e Me eMe çMe 4Me 8 0, 0 bond bond Ph Ph 8 O O _ st i bsad Ph @ Ph e Single Single Me Me -IDME Me band-''bond Single Single to 010 Ph Ph 1 Single I Single 11 oto-bond--/F\me-/F\me bond Single-Single 12 0, 0 bond bond Ph Ph 14'010 Single. Single Ph Ph bond bond \i-f 0, . v S. ngle bond-8 : 9- \--i bond Single. Single I bond 1 Ei 0, 0 _ Single % Single eMe eMe eMe eMe 17 010 Singlo bond-Me-D Me Me 1 L 3 I SXgL eMel 4 Fel 4 3 Mej Table 2 Rl R5 [11 m, n--XI X2 X3 Yl Y2 Y3 Y4 R4 R8 18s a, a-- t : : 1 I ' l 1 Single Single Single l 2, 4 H bond bond bond f 1 ° ' e X--/-aMe-aMe Me '20 20 H Single Single Single Singia e 21 2, H Single Single Single Ph Ph bond bond j} 21 2, 0 H-.. Single Single single bond bond Single Single \-\- 23 210 H bond bond bond Ph Ph bond Single Single \ \ 24 2, 0 H bond bond bond Ph Ph bond band Single Single Single bond bond bond me Me Me Single Single Single bond bond bons 27 Single Single Single bond bond bond 28 370 H-Single Single Single Ph Ph bond bond bond 29 310 H-Single Single Single Ph oo Ph bond bond bond 30 sto H-Single Single Single Ph (b Ph bond bond bond 31 3, 0 H-Single Single Single bond bond bond 32 3, 0 F Single Single Single. m-7kMe 'bond bflnd bnd (ltle (1lle IVI j 1 Me I 34 4, 0 F Single Single Single. Ph Ph bond bond bond Single Single Single Single bond bond bond _ Me Me Me Me Me Me Me Me s. c'rQ -"S. tlgle S. tgle S.. rigl8 s C s :. v i v i. vi bond bond bond me Me Me Me 'bond bond bondMeMeMeMe 'band bad bond 'bond bond bond "s Y Table 3 {1] 4 m, n | RL X Y1 g Y2 J Y3 | Y4 1 R4 R8 3 7 4, O H. Single Single bond P h m P h m 38 m, n xi X2 xs Yi Y2 Y3 Y4 R4 R8 Single Single Single a band bond band 40 4, O H _ Sin} e $kgle Slngle « « « Single Single S3ngle Me Me _M __ '""'bond bond bond le Single 39 410 H bond bond bond Ph Ph 89 0""iT-f Ph"='"pr"" 42 4, 0 H Single Single Single bond bond bond - Single Single Singé ., 'fi bond bond bQnd Ph .-.. Ph , .,'. f 43 4 H Single Single Single Ph Ph bond bond bond 44 410 F single single Single ' bond bond brnd v - Single. Sing. Single bond bond bond '-Sing. e Single S3. ngla r v i i v bond bzd bond 46 510 H Single-Single Single bond bond bond , ! ! e Me Single Single Single h pu 47 5, 0 H-bond bond bond Ph'k Ph k Single Single Single Ph band bond bond Single Single Single Me Me me me 9 9 ph f t lY bond bond bond _ Single Single Single, ...-Më Me. Me Me Single Single Single 52 510 H bond bond bond Ph Ph Single Single Single 61 , 'bond bvnd bond P... P. _ _. Single Single-Single bond bond bond Me Me-aMe, \-/v/\"/\/ K 0 1 TT IT Single Single Single \/r"\/r/r bond bond bond 64 ngle Single Single So -H. bond bond-J-Me-J>-Me-Me--Me Me , ! sin J. /i singze .... le Me Table 4 R R5 [1] m, n--XI X2 X3 Yl Y2 Y3 Y4 R4 R8 57 | 1, 1 H | H bonagle I F F 5ingle < Me| 4 el 4 Me| 4 Jel . F F F ...,.,, _. _ 68 1, 1 H H SOnndle F F Single Ph Ph $$ FF 69 10 1 H H Single t Single < Me eMe eMe eMe _,. 1, 1 H H Single Single, Ph Ph bond F F Single Single 'Single S Single <-. <-.-.,-. 59 1, 1 II H bond" bond--Me Me-Me-. Me . r bondi Single single N Single M i __ -// Me bond Me bond bond bans '"'H 3 'i.' . M, bond bons Single Single 64 1, 1 H H bond bond M e -ome \-/-Me 65 1, 1 H H Single Single Ph Ph bond bond {Me Me Me Me Singl. e ,.. Singla , ? ., H H bond . i bond 7. y r .' V r'v n Single Single bond ... i bond .................. 68 aMe : a : aMe : : a 'honc bond ; r v l ; :. r l 1 li I t 11 t 1 . _ l _..,. __............ 69 1, 1 H H Smgle t bingdle eMe eMe ethe eMe _ m S _ W. w 70 1 J 1 H H Single e Sm gle < Me < ~Me < Me < Me sv..... _. Wo. 7 1 1, 1 EI H S ng1e X s ngle < Me < Me < Me < Me ... __., _ w..-.. 72 ill H H Single Single e M Me M '12 , I H . 1 H II v i \ J Table 5 HI R5 [11 m, n Xi X2 X3 Yi Y2 Y3 Y4 R4 R8 bond, i. ngle . bond bond Single Single 74 | 1, 1 H | H boindle I ß | bond < Me| 4 jel 4 Me| 4 Wel Singl. e Me Single _ _____ bcnd"'"M'."bond i e f 1 Ne Me f Me 75 2} 2 XI H Single 4, XP Single 4 Me 4 Me 4 ble 4 Me 76 2, 2 H II -0-b--Me-)-Me-<Me--Me Single Me Single bord 2 2 bond ! M M bond bondl \/ l 1 l 1 mye Singl Single . 01 Me bond bond 78 2, 2 H H Single _ Single < M e 4 M e 4 M e @ M e ! 79 1, 1 H F Single \ Single--Me-f-Me-f-Me--Me bond bond o l 1 U IP Single T' Single/ ; r\., r/"/f bond bond N--/ 82 1J H F F-§--Me-Me-Me--Me 83 2, 1 H F- F-n--Me-Me -Me-. Me bond'bond 82 11 H F single Me-//--\\-Me Me e bons Single Single v i -//- y \y it v M 2} 2 E F t Sing1e t eM eMe eMe t2Me 85 | 1, 1 EI | H t | t tMeE 4 el eMe| 4 VIeß me \\-Me \\-Me M e ** Tr /\"/\y \. f \t/ 86 2, 2 H H-4J- (1 : --<. Me-f-Me-<Me-fMe

Figs. 1 to 6 illustrate preferred examples of the organic light-emitting devices of the present invention.

The example of Fig. 1 shows one example having a structure in which an anode 2, a light-emitting layer 3 and a cathode 4 are provided on substrate 1 in this order. The light-emitting device of this example is useful when it possesses a hole- transporting capability, an electron-transporting capability and light-emitting performance singly by itself, or when compounds possessing them respectively are mixed for use.

The example of Fig. 2 has the structure in which an anode 2, a hole-transporting layer 5, an electron-transporting layer 6 and a cathode 4 are provided on substrate 1 in this order. This example is useful when a material having a hole-transporting capability and/or an electron-transporting capability is used for their respective layers and a light- emitting substance in combination with a mere hole- transporting substance or an electron-transporting substance having no light-emitting property. In this case, the light-emitting layer is comprised of hole- transporting layer 5 or electron-transporting layer 6.

The example of Fig. 3 has the structure in which an anode 2, a hole-transporting layer 5, a light-emitting layer 3, an electron-transporting

layer 6 and a cathode 4 are provided on a substrate 1 in this order, a carrier-transporting function and a light-emitting function being separated. The separation of the light-emitting layer from the charge-transporting layers extremely increases the freedom of material selection since compounds having a hole-transporting property, an electron- transporting property or a light-emitting property can be used in a suitable combination. For example, various compounds having different light-emitting wavelengths can be used to allow diversification of the hue of light emission. Further, it is also possible to try to improve the efficiency of light emission by effectively confining each carrier or exciton in the central light-emitting layer 3.

The example of Fig. 4 has the structure in which a hole-injecting layer 7 is arranged between anode 2 and hole-transporting layer 5 in the form of Fig. 3, which is effective in improving adhesiveness of anode 2 to hole-transporting layer 5, improving a hole-injecting property, being effective to reduce voltage.

Examples of Figs. 5 and 6 have the structure in which a layer for blocking a hole or an exciton from passing through to the side of the cathode 4 (hole- blocking layer 8) is inserted between light-emitting layer 3 and electron-transporting layer 6 in the

forms of Figs. 3 and 4. The use of a compound having a very high ionization potential as the hole-blocking layer 8 is an effective for improving the efficiency of light-emission in the structure.

Examples shown in Figs. 1 to 6 are very basic device structures, and the structures of the organic light-emitting device using the compounds of the present invention are not limited to them. It is possible to take various laminated structure, for example, to provide an insulating layer to an interface between an electrode and an organic layer, to provide an adhesion layer or an interference layer or to compose the hole-transporting layer from two layers having different ionization potentials.

The compounds represented by general formulas [1] to [6] for use in the present invention can be used in any forms in Figs. 1 to 6.

In particular, the organic layer using the compounds of the present invention is useful as a light-emitting layer, an electron-transporting layer or a hole-transporting layer. In addition, the layer formed by a vacuum deposition process or a solution coating process hardly causes crystallization or the like and is excellent in the stability with time.

Although the present invention uses the compounds represented by the general formulas [1] to [6] as constituent components especially for the

light-emitting layer, already known hole-transporting compounds, light-emitting compounds or electron- transporting compounds can also be used together as necessary.

Examples of these compounds include the followings: Hole-transportinq compounds CH3 CH3 N N \ N I I N- CH3 ß TOD 0-NID OL. Q aNJ9CH3 NXN N H N-Y-N N 3b'N N-0 N N HC s Pc-M HsC Pc-M m-MTDATA MnCI, GaCi, etc f S 3 N N / N N N N a DTDPFL spiro-PD N N aCH3 H3C CH3 N N C H H3C CH3 3 TPAC PDA Electron-transporting light-emitting materials Light-emitting materials '"NC CN s7 ! _. N (/ C C2Hs HgC 0 Y r tL L < u . CHg C2H5 DCM-1 Coumarin6 C2H5 N/O/O H C2H5 H C C H Nile red ° Quinacridone -aHC=HC- (D-&CH=CH-&N DTPABVi ,, r, Rubrene Coronene Light-emitting layer matrix materials and electron- transporting materials Polymer-based hole-transporting CH3 - (CH-GH- (CH-CH-f-C-CH N I C=O N u=O PVCz" DPA-PS N TPA-PMMA CH3 CHUG t (-C-CHn- (- C-CH C=O lc=o I I o NH O Nw O Nw TPD-PMMA TPD-PMAA CH3 CH3 A, CH3 0 CHg CHg CH2CH-CO---C CO N N CH3 n TPD-PCA s CH3 ] | H3 9 R n \ ln R : c8H17lc12H25 S b Poly thiophene Polysilane Polymer-based light-emitting materials and charge-transporting materials

In the organic light-emitting device of the present invention, the layers containing the compounds represented by the general formulas [1] to [6] and the layers comprising other organic compounds are generally formed into thin films by a vacuum deposition process or a coating process in which they are dissolved in a suitable solvent. In particular, when the film is formed by the coating process, it is

also possible to form the film in combination with suitable binding resins.

The above described binding resins can be selected from a wide range of binding resins, and include, but not limited to, polyvinylcarbazole resins, polycarbonate resins, polyester resins, polyallylate resins, polystyrene resins, acrylic resins, methacrylic resins, butyral resins, polyvinylacetal resins, diallylphthalate resins, phenol resins, epoxy resins, silicone resins, polysulfone resins, urea resins and the like. In addition, one of them or a mixture of two or more of them may be used in the form of a homopolymer or a copolymer.

The materials for the anode preferably have a large work function, and elemental metals such as gold, platinum, nickel, palladium, cobalt, serene, vanadium and alloys thereof and metal oxides such as tin oxides, zinc oxides, indium tin oxides (ITO) and indium zinc oxides can be used. In addition, conductive polymers such as polyaniline, polypyrrole, polythiophene and poyphenylene sulfide can be used.

These electrode materials can be. used singly or in combination.

The materials for the cathode preferably have a small work function, and elemental metals such as lithium, sodium, potassium, calcium, magnesium,

aluminum, indium, silver, lead, tin and chrome and alloys thereof can be used. Metal oxides such as indium tin oxides (ITO) can also be used. Moreover, the cathode may have one-layered structure or may have a multilayered structure.

The substrates for use in the present invention include, but not limited to, metal substrates, opaque substrates such as ceramic substrates, transparent substrates such as glass, quartz and plastic sheet.

Moreover, it is possible to control the color of emitted light using a color filter film, a fluorescent color conversion filter film, a dielectric reflecting film and the like for the substrate.

Furthermore, a protective layer or a sealing layer can also be provided to the prepared device for the purpose of preventing contact with oxygen, moisture and the like. The protective layer includes an inorganic material film such as a diamond thin film, a metal oxide or a metal nitride; a polymeric film such as a fluororesin, polyparaxylene, polyethylene, a silicone resin and a polystyrene resin; a photo-curable resin or the like. Moreover, the device itself can be covered with glass, a gas- impermeable film, metal or the like and packaged with a suitable sealing resin.

Examples

The present invention will now be described in detail with reference to examples, but the present invention is not limited to them.

<Example 1> An organic light-emitting device having the structure shown in Fig. 3 was prepared in a method illustrated below.

On a glass substrate as substrate 1, indium tin oxide (ITO) of 120 nm in thickness as anode 2 was deposited by a sputtering process and ultrasonically cleaned with acetone and isopropyl alcohol (IPA) in this order, and dried by boiling with IPA after the cleaning. Further, it was cleaned with UV/ozone. The resultant structure is referred to a transparent conductive supporting substrate.

There was prepared a 0. 5% by weight chloroform solution of the compound represented by the following structural formula:

The solution was dropped on the ITO electrode (anode 2) of the transparent conductive supporting substrate, and was subjected to a spin coating first at a revolution of 500 RPM for 10 seconds and then at a revolution of 1,000 RPM for one minute to form a film. It was dried in a vacuum oven at 80°C for 10 minutes to completely remove the solvent in the thin film. The formed TPD film (hole-transporting layer 5) had a thickness of 50 nm.

On hole-transporting layer 5 the above illustrated compound No. [1]-6 and the above illustrated compound No. [2]-1 (weight ratio of 5: 100) were subjected to co-deposition to provide light- emitting layer 3 of 20 nm. As for the conditions, the degree of vacuum at the deposition was 1.0 x 10-4 Pa and the speed of deposition was 0.2 to 0.3 nm/sec.

Moreover, aluminum-quinolinol (Alq3) was deposited by a vacuum deposition process in a thickness of 40 nm to form electron-transporting layer 6. As for the conditions for depositing these organic layers, the degree of vacuum at the deposition was 1.0 x 10-4 Pa and the speed of deposition was 0. 2 to 0.3 nm/sec.

Next, a vapor deposition material comprised of an aluminum-lithium alloy (lithium concentration of 1 atomic %) was used to form a metal layer film having a thickness of 10 nm on electron-transporting layer 6 by a vacuum deposition process, and further by the

vacuum deposition process an aluminum layer having a thickness of 150 nm was provided to form an electron- injecting electrode (cathode 4). As for the conditions, the degree of vacuum at the vapor deposition was 1.0 x 10-4 Pa and the speed of deposition was 1.0 to 1.2 nm/sec.

The resultant structure was covered with a protective glass plate and sealed with an acrylic resin-based adhesive material in a dry air atmosphere to prevent the degradation of the device due to moisture absorption.

When the thus obtained organic EL device was applied with a direct-current voltage of 9 V using an ITO electrode (anode 2) as a positive electrode and an Al-Li electrode (cathode 4) as a negative electrode, the emission of blue light having an emission luminance of 1,250 cd/rr, a maximum luminance of 3,770 cd/m2 and a luminous efficiency of 0.45 lm/W was observed.

<Examples 2 to 7> Devices were prepared and evaluated in the same manner as in Example 1 except that illustrated compounds shown in Table 6 replaced the illustrated compound [1]-6. The results are shown in Table 6.

Table 6 Illustrate Applied Luminance Maximum Example d compound voltage luminance Efficiency (cd/m2) (cd/m2) (lm/W) 2 [1]-34 9 1670 5200 0.60 3 [1]-41 8 1840 6150 0.65 4 [1]-46 9 1730 5480 0.60 5 [1]-57 9 2050 6990 0.67 6 [1]-64 8 2200 7270 0.72 7 [1]-66 8 2600 7700 0.85

<Example 8> A device was prepared in the same manner as in Example 1 except that the above illustrated compound No. [1]-41 and the above illustrated compound No. [2]- 15 (weight ratio of 5: 100) replaced the above illustrated compound No. [1]-6 and the above illustrated compound No. [2]-1 respectively to be subjected to the co-deposition to provide light- emitting layer 3 of 20 nm.

When the obtained device was applied with a direct-current voltage of 9 V using an ITO electrode (anode 2) as a positive electrode and an Al-Li electrode (cathode 4) as a negative electrode, the emission of blue light having an emission luminance of 1,680 cd/m2, a maximum luminance of 4,650 cd/m2 and a luminous efficiency of 0.57 lm/W was observed.

<Example 9> A device was prepared in the same manner as in

Example 8 except that the illustrated compound No. [1]-57 replaced the illustrated compound No. [1]-41.

When the obtained device was applied with a direct-current voltage of 9 V using an ITO electrode (anode 2) as a positive electrode and an Al-Li electrode (cathode 4) as a negative electrode, the emission of blue light having an emission luminance of 1,850 cd/m2, a maximum luminance of 4,950 cd/m2 and a luminous efficiency of 0.58 lm/W was observed.

<Example 10> A device was prepared in the same manner as in Example 1 except that the above illustrated compound No. [1]-41 and the above illustrated compound No. [3]-1 (weight ratio of 5: 100) replaced the above illustrated compound No. [1]-6 and the above illustrated compound No. [2]-1 respectively to be subjected to the co-deposition to provide light- emitting layer 3 of 20 nm.

When the obtained device was applied with a direct-current voltage of 8 V using an ITO electrode (anode 2) as a positive electrode and an Al-Li electrode (cathode 4) as a negative electrode, the emission of blue light having an emission luminance of 2,150 cd/m2, a maximum luminance of 6,840 cd/m2 and a luminous efficiency of 0.71 lm/W was observed.

<Example 11> A device was prepared in the same manner as in

Example 10 except that the illustrated compound No. [1]-39 replaced the illustrated compound No. [1]-41.

When the obtained device was applied with a direct-current voltage of 8 V using an ITO electrode (anode 2) as a positive electrode and an Al-Li electrode (cathode 4) as a negative electrode, the emission of blue light having an emission luminance of 2, 370 cd/m2, a maximum luminance of 7,320 cd/m2 and a luminous efficiency of 0.73 lm/W was observed.

<Example 12> A device was prepared in the same manner as in Example 1 except that the above illustrated compound No. [1]-46 and the above illustrated compound No. [4]-1 (weight ratio of 5: 100) replaced the above illustrated compound No. [l]-6 and the above illustrated compound No. [2]-1 respectively to be subjected to the co-deposition to provide light- emitting layer 3 of 20 nm.

When the obtained device was applied with a direct-current voltage of 8 V using an ITO electrode (anode 2) as a positive electrode and an Al-Li electrode (cathode 4) as a negative electrode, the emission of blue light having an emission luminance of 2,200 cd/m2, a maximum luminance of 6, 760 cdlm2 and a luminous efficiency of 0.72 lm/W was observed.

<Example 13> A device was prepared in the same manner as in

Example 1 except that the above illustrated compound No. [1]-41 and the above illustrated compound No. [5]-2 (weight ratio of 5: 100) replaced the above illustrated compound No. [1]-6 and the above illustrated compound No. [2]-1 respectively to be subjected to the co-deposition to provide light- emitting layer 3 of 20 nm.

When the obtained device was applied with a direct-current voltage of 8 V using an ITO electrode (anode 2) as a positive electrode and an Al-Li electrode (cathode 4) as a negative electrode, the emission of blue light having an emission luminance of 3,100 cd/m2, a maximum luminance of 7,250 cd/m2 and a luminous efficiency of 1.02 lm/W was observed.

Example 14> A device was prepared in the same manner as in Example 1 except that the above illustrated compound No. [1]-39 and the above illustrated compound No. [5]-9 (weight ratio of 5: 100) replaced the above illustrated compound No. [l]-6 and the above illustrated compound No. [2]-l respectively to be subjected to the co-deposition to provide light- emitting layer 3 of 20 nm.

When the obtained device was applied with a direct-current voltage of 8 V using an ITO electrode (anode 2) as a positive electrode and an Al-Li electrode (cathode 4) as a negative electrode, the

emission of blue light having an emission luminance of 4,500 cd/m2, a maximum luminance of 8,420 cd/m2 and a luminous efficiency of 1.18 lm/W was observed.

<Example 15> A device was prepared in the same manner as in Example 1 except that the above illustrated compound No. [1]-57 and the above illustrated compound No. [6]-1 (weight ratio of 5: 100) replaced the above illustrated compound No. [1]-6 and the above illustrated compound No. [2]-1 respectively to be subjected to the co-deposition to provide light- emitting layer 3 of 20 nm.

When the obtained device was applied with a direct-current voltage of 9 V using an ITO electrode (anode 2) as a positive electrode and an Al-Li electrode (cathode 4) as a negative electrode, the emission of blue light having an emission luminance of 1,980 cd/m2, a maximum luminance of 5,300 cd/m2 and a luminous efficiency of 0.60 lm/W was observed.

<Examples 16 to 21> The emission spectra of the devices prepared according to Examples 2,5, 10,12, 14 and 15 were observed with the MCPD-7000 and the CIE chromaticity coordinates were determined. The results are shown in Table 7.

Table 7 Example Example for CIE color coordinates device (x, y) 16 2 0.15, 0.07 17 5 0.15, 0.10 18 10 0.15, 0.09 19 12 0.15, 0.10 20 14 0.16, 0.11 21 18 0.15, 0.10

<Example 22> When the voltage was applied to the device prepared in Example 13 for 100 hours while maintaining the current density at 7.0 mA/cm2 in a nitrogen atmosphere, the initial luminance of 480 cd/m2 dropped to 410 cd/m2 after 100 hours, exhibiting only a small reduction of luminance.

<Comparative Example 1> A device was prepared in the same manner as in Example 1 except that, as light-emitting layer 3, there was used the following styryl compound:

When the obtained device was applied with a direct-current voltage of 10 V using an ITO electrode

(anode 2) as a positive electrode and an Al-Li electrode (cathode 4) as a negative electrode, the emission of greenish blue white light having an emission luminance of 120 cd/m2, a maximum luminance of 3,800 cd/m2 and a luminous efficiency of 0.17 lm/w was observed.

<Comparative Example 2> A device was prepared in the same manner as in Example 1 except that the styryl compound in Comparative Example 1 and the above illustrated compound No. [4]-1 (weight ratio of 5: 100) replaced the above illustrated compound No. [1]-6 and the above illustrated compound No. [2]-1 respectively to be subjected to the co-deposition to provide light- emitting layer 3 of 20 nm.

When the obtained device was applied with a direct-current voltage of 10 V using an ITO electrode (anode 2) as a positive electrode and an Al-Li electrode (cathode 4) as a negative electrode, the emission of greenish blue/white light having an emission luminance of 125 cd/m2, a maximum luminance of 4,500 cd/m2 and a luminous efficiency of 0.30 lm/W was observed.

<Comparative Example 3> The emission spectrum of the device prepared according to Comparative Example 2 was observed with the MCPD-7000 and the CIE chromaticity coordinates

were determined to be (x, y) = (0.16, 0.30).

As described above by illustrating embodiments and examples, the organic light-emitting devices of the present invention provide the emission having high luminance at a low applied voltage and are also excellent in color purity and durability, as a single layer or a mixed layer of a dopant/host by combining any of [2] to [6] with [1]. Moreover, it is possible to prepare the devices by using a vacuum deposition process, casting process or the like, and the devices having a large area can be prepared easily at a relatively low cost.