Title:
ORGANIC ELECTROLUMINESCENT ELEMENT AND ELECTRONIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/138976
Kind Code:
A1
Abstract:
An organic electroluminescent element (1) which comprises a first light emitting layer (51) that is arranged between a positive electrode (3) and a negative electrode (4), and a second light emitting layer (52) that is arranged between the first light emitting layer (51) and the negative electrode (4), wherein: the first light emitting layer (51) contains a first host material and a first luminescent compound; the second light emitting layer (52) contains a second host material and a second luminescent compound; the triplet energy T1(H1) of the first host material and the triplet energy T1(H2) of the second host material satisfy the relation of mathematical formula (1); and the lowest unoccupied molecular orbital energy level LUMO(H2) of the second host material and the lowest unoccupied molecular orbital energy level LUMO(D2) of the second luminescent compound satisfy the relation of mathematical formula (2).　Mathematical formula (1): T1(H1) < T1(H2)
Mathematical formula (2): |LUMO(D2)| - |LUMO(H2)| < 0.74 eV
Inventors:
TOYOSHIMA HIROAKI (JP)
NISHIMURA KAZUKI (JP)
KAWAMURA YUICHIRO (JP)
NISHIMURA KAZUKI (JP)
KAWAMURA YUICHIRO (JP)
Application Number:
PCT/JP2021/048441
Publication Date:
June 30, 2022
Filing Date:
December 24, 2021
Export Citation:
Assignee:
IDEMITSU KOSAN CO (JP)
International Classes:
C09K11/06; H01L51/50; H05B33/12
Domestic Patent References:
| WO2021049655A1 | 2021-03-18 |
Foreign References:
| JP2013157552A | 2013-08-15 | |||
| JP2019186521A | 2019-10-24 | |||
| KR20190088651A | 2019-07-29 | |||
| US20210098713A1 | 2021-04-01 |
Attorney, Agent or Firm:
KINOSHITA & ASSOCIATES (JP)
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