Kim, Gyeong Heon Lampande, Raju Kong, Ji Hoon Lee, Jung Min Kwon, Jang Hyuk Lee, Jae Kyun Park, Jung Hwan 2024-01-20T07:03:42Z 2024-01-20T07:03:42Z 2021-09-05 2015-05 2046-2069 https://pubs.kist.re.kr/handle/201004/125488 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%. English ROYAL SOC CHEMISTRY EFFICIENT GREEN BLUE OLEDS DENSITY ENERGY DERIVATIVES DEVICES COMPLEXES EXCHANGE PHOLEDS New bipolar host materials for high performance of phosphorescent green organic light-emitting diodes Article 10.1039/c5ra04593b 1 RSC ADVANCES, v.5, no.40, pp.31282 - 31291 RSC ADVANCES 5 40 31282 31291 scie scopus 000353165800006 2-s2.0-84927562262 Chemistry, Multidisciplinary Chemistry Article EFFICIENT GREEN BLUE OLEDS DENSITY ENERGY DERIVATIVES DEVICES COMPLEXES EXCHANGE PHOLEDS OLEDs biphenyl pyrimidine indenocarbozole