Title:
ORGANIC LIGHT EMITTING ELEMENT
Document Type and Number:
WIPO Patent Application WO/2004/060026
Kind Code:
A1
Abstract:
An organic white light emitting element having a high emission efficiency, especially a highly efficient organic white light emitting element having such an emission spectrum that a peak exists in each wavelength region of red, green and blue. Since the spectral region of the lowest emission efficiency is red region, a highly efficient organic white light emitting element is obtained by introducing a red phosphorescence material. In order to prevent emission of light only from the red phosphorescence material, a second light emitting region (114) employing the red phosphorescence material (124) as a light emitting body is spaced apart from a first light emitting region (113) emitting light on the short wavelength side as compared with the second light emitting region, as shown on Fig.(1). In the arrangement of Fig.(1), an electron transporting material is preferably employed in a layer (115) between the first light emitting region and the second light emitting region and a Hall block material is more preferably employed.
Inventors:
SEO SATOSHI
YAMAZAKI HIROKO
YAMAZAKI HIROKO
Application Number:
PCT/JP2003/016168
Publication Date:
July 15, 2004
Filing Date:
December 17, 2003
Export Citation:
Assignee:
SEMICONDUCTOR ENERGY LAB (JP)
International Classes:
H01L51/50; H05B33/14; (IPC1-7): H05B33/14; H05B33/22; H05B33/12
Domestic Patent References:
| WO2001008230A1 | 2001-02-01 |
Foreign References:
| JPH0878163A | 1996-03-22 | |||
| JPH04284395A | 1992-10-08 | |||
| JP2001313180A | 2001-11-09 | |||
| US20020027416A1 | 2002-03-07 |
Other References:
BALDO, M.A. ET AL: "Highly efficient phosphorescent emission from organic electroluminescent devices", NATURE, vol. 395, 10 September 1998 (1998-09-10), pages 151 - 154, XP002949186
OBRIEN, D.F. ET AL: "Improved energy transfer in electrophosphorescent devices", APPLIED PHYSICS LETTERS, vol. 74, no. 3, 1999, pages 442 - 444, XP002933920
BALDO, M.A. ET AL: "Very high-efficiency green organic light-emitting devices based on electrophosphorescence", APPLIED PHYSICS LETTERS, vol. 75, no. 1, 1999, pages 4 - 6, XP002949187
BALDO M A ET AL.: "HIGHLY EFFICIENT PHOSPHORESCENT EMISSION FROM ORGANIC ELECTROLUMINESCENT DEVICES", NATURE, vol. 395, 1998, pages 151 - 154, XP001002103, DOI: doi:10.1038/25954
See also references of EP 1578172A4
OBRIEN, D.F. ET AL: "Improved energy transfer in electrophosphorescent devices", APPLIED PHYSICS LETTERS, vol. 74, no. 3, 1999, pages 442 - 444, XP002933920
BALDO, M.A. ET AL: "Very high-efficiency green organic light-emitting devices based on electrophosphorescence", APPLIED PHYSICS LETTERS, vol. 75, no. 1, 1999, pages 4 - 6, XP002949187
BALDO M A ET AL.: "HIGHLY EFFICIENT PHOSPHORESCENT EMISSION FROM ORGANIC ELECTROLUMINESCENT DEVICES", NATURE, vol. 395, 1998, pages 151 - 154, XP001002103, DOI: doi:10.1038/25954
See also references of EP 1578172A4
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