Light-emitting material comprising orthometalated iridium complex, light-emitting device, high efficiency red light-emitting device, and novel iridium complex
View Patent ↗A light-emitting material comprises a compound having a partial structure represented by the following formulas (8), (20) and tautomers thereof: wherein the variables are as defined in the specification.
1. An organic light-emitting device comprising a light-emitting layer or a plurality of organic compound layers containing a light-emitting layer between a pair of electrodes, wherein at least one layer comprises at least one material having a partial structure selected from the following formula (8) and a tautomer thereof:
wherein X 201 , X 202 , X 203 and X 204 each represents a nitrogen atom or C—R and forms a nitrogen-containing heteroaryl 6-membered ring with —C═N—, with the proviso that at least one of X 201 , X 202 , X 203 and X 204 represents a nitrogen atom; R represents a hydrogen atom or substituent; and Z 201 represents an atomic group for forming a heteroaryl ring.
2. An organic light-emitting device comprising a light-emitting layer or a plurality of organic compound layers containing a light-emitting layer between a pair of electrodes, wherein at least one layer comprises at least one material having two or three different ligands and a partial structure selected from the following formula (8) and a tautomer thereof:
wherein X 201 , X 202 and X 203 each represents a nitrogen atom or C—R and forms a nitrogen-containing heteroaryl 6-membered ring with —C═N—, with the proviso that at least one of X 201 , X 202 and X 203 represents a nitrogen atom; X 204 represent C—R; R represents a hydrogen atom or substituent; and Z 201 represents an atomic group for forming an aryl or heteroaryl ring.
3. The organic light-emitting device of claim 2 , wherein X 201 represents a nitrogen atom.
4. The organic light-emitting device of claim 2 , wherein X 202 represents a nitrogen atom.
5. The organic light-emitting device of claim 2 , wherein X 203 represents a nitrogen atom.