New bipolar host materials for high performance of phosphorescent green organic light-emitting diodes
- New bipolar host materials for high performance of phosphorescent green organic light-emitting diodes
- 김경헌; 람판디; 공지훈; 이정민; 권장혁; 이재균; 박정환
- OLEDs; biphenyl pyrimidine; indenocarbozole
- Issue Date
- RSC advances
- VOL 5, NO 40, 31282-31291
- We report a series of four bipolar host materials with indenocarbozole and biphenyl pyrimidine moieties for efficient phosphorescent green organic light-emitting diodes (OLEDs). All four host materials possess excellent electro-optical properties as well as good thermal and morphological stability due to their high glass transition temperature of 129 degrees C and decomposition temperature of 363-401 degrees C. The new materials also show good triplet energy of 2.76 eV and excellent charge carrier transport properties. The fabricated OLED device with 11-[3-(2,6-diphenyl-pyrimidin-4-yl)-phenyl]-12,12-dimethyl-11,12-dihydro-11-aza-indeno[2,1-a]fluorene (mDPPICz1) as green host shows maximum current and power efficiency as high as 75.8 cd A(-1) and 87.1 lm W-1 at 1000 cd m(-2), and an almost ideal external quantum efficiency of 21.7%.
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