Composition, film, organic light emitting element, method for providing light emitting composition, and program
AssigneeKyulux, Inc.
InventorsHayato KAKIZOE, Hiroaki OZAWA, Ayataka ENDO, YuSeok YANG
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Abstract
An organic light emitting element produced by using a light emitting composition that contains both a first compound having a PBHT value more than 0.730 and a second compound having ES1 lower than that of the first compound and AEsT less than 0.20 eV is excellent in durability. ES1 is the lowest excited singlet energy level, AEsT is the difference between the lowest excited singlet energy level and the lowest excited triplet energy level.
Claims33
A composition comprising both a first compound satisfying the following expression (1a) and a second compound satisfying the following expression (2b), the first compound and the second compound satisfying the following expression (A):
- PBHT(1) >0.730 expression (1a)
- ΔEST(2)<0.20 eV expression (2b)
- ES1(1) >ES1(2) expression (A)
- wherein PBHT(1) is a PBHT value of the first compound, ΔEs-r(2) is a difference between a lowest excited singlet energy level ES1(2) of the second compound and a lowest excited triplet energy level ET1(2) of the second compound, and ES1(1) is a lowest excited singlet energy level of the first compound.
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A method for providing a light emitting composition containing a first compound and a second compound, the method comprising designing the first compound to be combined with the second compound that has ΔEST(2) less than 0.20 eV,
- the method also comprising designing the second compound so that ES1(1) is higher than ES1(2) and PBHT(1) is more than 0.730.
Dependencies are inferred from the claim text.