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강영진,자엔레나,이준엽,고가연,오충훈,윤지선,정현호 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Two heteroleptic blue phosphorescent Ir(III) complexes were synthesized based on the main C^N chelate bipyridine ligands, with either a 4-positon (1) or 5-position (2) of bulky trimethylsilyl substituent, and acetylacetonate (acac) as an ancillary ligand. Their structure-electroluminescent property relationships were systematically investigated. The combination of trimethylsilyl substituent and acac ligand decreases the energy gap relative to the non-substituted counterpart: Ir(dfpypy)(acac), where dfpypy is 2'-6'-difluoro-2,3'-bipyridine. Blue PHOLEDs which use both complexes as a dopant, and mCPPO1 as a host material, were fabricated successfully. Complex 1 had the highest performance among the reported blue PHOLEDs without co-host, making it an outstanding blue triplet emitter in PHOLEDs with over 30% of external quantum efficiency. Furthermore, the efficiency roll-off dramatically improved in the 1-based device.