Organic electroluminescence device
View Patent ↗An organic electroluminescent device includes a pair of electrodes; and an organic layer between the pair of electrodes, which includes a light-emitting layer and contains a compound represented by the following formula (1): wherein each of R 1 to R 7 independently represents a hydrogen atom or a substituent with the proviso that at least one of R 1 to R 7 represents a deuterium atom or a substituent containing a deuterium atom.
1. An organic electroluminescent device comprising:
a pair of electrodes; and
an organic layer between the pair of electrodes, which comprises a light-emitting layer and contains a compound represented by the following Formula (Ia) or Formula (Ic):
wherein
each of R 2a to R 7a independently represents a hydrogen atom or a substituent with the proviso that at least one of R 2a to R 7a represents a deuterium atom or a substituent containing a deuterium atom,
n 1a represents an integer of 2 to 6, and
L 1a represents an n 1a -valent linking group,
(Ind) n -L Formula (Ic)
wherein
Ind represents a residue structure of the compound of the Formula (I),
L represents a linking group bound to the 2- or 3-position of the indole ring of the compound of the formula (I), and
n represents an integer of 2 or greater,
wherein
each of R 1 to R 7 independently represents a hydrogen atom or a substituent with the proviso that at least one of R 1 to R 7 represents a deuterium atom or a substituent containing a deuterium atom,
wherein in the above Formula (Ia) and Formula (I), the ratio between deuterium atoms and hydrogen atoms, as represented by the number of deuterium atoms:the number of hydrogen atoms is from 100:0 to 1:99.
2. The organic electroluminescence device according to claim 1 , wherein
the light emitting layer contains a phosphorescent material.
3. The organic electroluminescence device according to claim 1 , wherein
the light emitting layer contains at least one of a platinum complex phosphorescent material and an iridium complex phosphorescent material.
4. The organic electroluminescence device according to claim 1 , wherein
the light emitting layer contains a platinum complex phosphorescent material.
5. The organic electroluminescence device according to claim 1 , wherein
the light emitting layer contains a platinum complex phosphorescent material having a tetradentate ligand.
6. The organic electroluminescence device according to claim 1 , wherein
at least one of R 2 to R 7 in the formula (I) represents a deuterium atom.
7. The organic electroluminescence device according to claim 1 , wherein the compound represented by the formula (Ia) or formula (Ic) is contained in the light emitting layer.
8. The organic electroluminescence device according to claim 1 , wherein the compound represented by the formula (Ia) or (Ic) is contained in a layer adjacent to the light emitting layer.
9. The organic electroluminescence device according claim 1 , wherein
R 1 in the formula (I) represents an aryl group or a heteroaryl group.
10. The organic electroluminescence device according to claim 1 , wherein
one of R 2 and R 3 in the formula (I) is an alkyl group having a tertiary or quaternary carbon atom, and
the alkyl group is bound to the compound via the tertiary or quaternary carbon atom.
11. An organic electroluminescent device comprising:
a pair of electrodes; and
an organic layer between the pair of electrodes, which comprises a light-emitting layer and contains a compound represented by the following Formula (Ib):
wherein
each of R 2b , R 3b and R 5b represents a hydrogen atom or a substituent with the proviso that at least one of R 2b , R 3b and R 5b represents a deuterium or a substituent containing a deuterium atom
n 1b represents an integer of 2 to 4, and
L 1b represents an n 1b -valent linking group,
wherein in the above Formula (Ib), the ratio between deuterium atoms and hydrogen atoms, as represented by the number of deuterium atoms:the number of hydrogen atoms is from 100:0 to 1:99.