Iridium compound and organic electroluminescent device using the same
An iridium compound is provided which is used as a light-emitting layer material of an organic EL device. An organic EL device using the iridium compound is high in device characteristics, including emission efficiency, brightness, color purity, and lifetime characteristics is also provided.
1 . An iridium compound of the following formula 1:
wherein A is CH or N; and
R 1 , R 2 , and R 3 are each independently a hydrogen atom, cyano group, hydroxy group, thiol group, nitro group, halogen atom, a substituted or unsubstituted C 1 -C 30 alkyl group, a substituted or unsubstituted C 1 -C 30 alkoxy group, a substituted or unsubstituted C 2 -C 30 alkenyl group, a substituted or unsubstituted C 6 -C 30 aryl group, a substituted or unsubstituted C 6 -C 30 arylalkyl group, a substituted or unsubstituted C 6 -C 30 aryloxy group, a substituted or unsubstituted C 2 -C 30 heteroaryl group, a substituted or unsubstituted C 2 -C 30 heteroarylalkyl group, a substituted or unsubstituted C 2 -C 30 heteroaryloxy group, a substituted or unsubstituted C 5 -C 30 cycloalkyl group, a substituted or unsubstituted C 2 -C 30 heterocycloalkyl group, a substituted or unsubstituted C 1 -C 30 alkylcarbonyl group, a substituted or unsubstituted C 7 -C 30 arylcarbonyl group, a C 1 -C 30 alkylthio group, —Si(R′)(R″)(R′″) where R′, R″ and R′″ are each independently a hydrogen atom or a C 1 -C 30 alkyl group, or —N(R′)(R″) where R′ and R″ are each independently a hydrogen atom or a C 1 -C 30 alkyl group.
2 . The iridium compound of claim 1 , wherein when A of the formula 1 is CH, R 1 is an electron donating group and R 2 and R 3 are each an electron withdrawing group.
3 . The iridium compound of claim 2 , wherein the electron donating group is a methyl group, an isopropyl group, a phenyloxy group, a benzyloxy group, a dimethylamino group, a diphenylamino group, a pyrrolidine group, or a phenyl group.
4 . The iridium compound of claim 2 , wherein the electron withdrawing group is a fluoro group, a cyano group, a trifluoromethyl group, or a phenyl group with a trifluoromethyl moiety.
5 . The iridium compound of claim 1 , wherein in the formula 1, A is CH or N; R 1 is a hydrogen atom, a methyl group, a pyrrolidyl group, a dimethylamino group, or a phenyl group; R 2 is a cyano group, CF 3 , C 6 F 5 , or a nitro group; and R 3 is a hydrogen atom or a cyano group.
6 . The iridium compound of claim 1 , which is a compound of the following formula 2:
7 . The iridium compound of claim 1 , which is a compound of the following formula 3:
8 . An organic EL device comprising an organic layer between a pair of electrodes, wherein the organic layer comprises an iridium compound of the following formula 1:
wherein A is CH or N; and
R 1 , R 2 , and R 3 are each independently a hydrogen atom, cyano group, hydroxy group, thiol group, nitro group, halogen atom, a substituted or unsubstituted C 1 -C 30 alkyl group, a substituted or unsubstituted C 1 -C 30 alkoxy group, a substituted or unsubstituted C 2 -C 30 alkenyl group, a substituted or unsubstituted C 6 -C 30 aryl group, a substituted or unsubstituted C 6 -C 30 arylalkyl group, a substituted or unsubstituted C 6 -C 30 aryloxy group, a substituted or unsubstituted C 2 -C 30 heteroaryl group, a substituted or unsubstituted C 2 -C 30 heteroarylalkyl group, a substituted or unsubstituted C 2 -C 30 heteroaryloxy group, a substituted or unsubstituted C 5 -C 30 cycloalkyl group, a substituted or unsubstituted C 2 -C 30 heterocycloalkyl group, a substituted or unsubstituted C 1 -C 30 alkylcarbonyl group, a substituted or unsubstituted C 7 -C 30 arylcarbonyl group, an C 1 -C 30 alkylthio group, —Si(R′)(R″)(R′″) where R′ and R″ are each independently a hydrogen atom or a C 1 -C 30 alkyl group, or —N(R′)(R″) where R′ and R″ are each independently a hydrogen atom or a C 1 -C 30 alkyl group.
9 . The organic EL device of claim 8 , wherein the organic layer is a light-emitting layer.
10 . The organic EL device of claim 8 , wherein the light-emitting layer comprises the iridium compound of 1 to 20 parts by weight, based on 100 parts by weight of a light-emitting layer forming material.
11 . The organic EL device of claim 8 , wherein when A of the formula 1 is CH, R 1 is an electron donating group and R 2 and R 3 are each an electron withdrawing group.
12 . The organic EL device of claim 11 , wherein the electron donating group is a methyl group, an isopropyl group, a phenyloxy group, a benzyloxy group, a dimethylamino group, a diphenylamino group, a pyrrolidine group, or a phenyl group.
13 . The organic EL device of claim 11 , wherein the electron withdrawing group is a fluoro group, a cyano group, a trifluoromethyl group, or a phenyl group substituted with a trifluoromethyl moiety.
14 . The organic EL device of claim 8 , wherein in the formula 1, A is CH or N; R 1 is a hydrogen atom, a methyl group, a pyrrolidyl group, a dimethylamino group, or a phenyl group; R 2 is a cyano group, CF 3 , C 6 F 5 , or a nitro group; and R 3 is a hydrogen atom or a cyano group.
15 . The organic EL device of claim 8 , wherein the iridium compound is a compound of the following formula 2:
16 . The organic EL device of claim 8 , wherein the iridium compound is a compound of the following formula 3: