期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 2, 期 31, 页码 6387-6394出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4tc00867g
关键词
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资金
- Natural Science Foundation of China [21202114, 21161160446, 61036009, 61177016]
- National High-Tech Research Development Program [2011AA03A110]
- Natural Science Foundation of Jiangsu Province [BK2010003]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Research Supporting Program of Suzhou Industrial Park
Two novel carbazole derivatives, 3,3'-(2,6-dimethyl-1,4-phenylene)bis(9-phenyl-9H-carbazole) (DMCz) and 3,3'-(2,3,5,6-tetramethyl-1,4-phenylene)bis(9-phenyl-9H-carbazole) (TMCz), are designed and synthesized as host materials for blue phosphorescent organic light emitting diodes (PHOLEDs). Both the materials possess sufficiently high glass transition temperatures and triplet energies for the blue dopant Ir-complex iridium(m) bis(4,6-(difluorophenyl)-pyridinato-N,C)picolinate (Firpic, 2.65 eV). The device using DMCz as the host material showed a better performance than that of TMCz with a maximum power efficiency of 36.0 +/- 0.7 lm per W, a maximum current efficiency of 43.7 +/- 0.6 cd per A and a maximum external quantum efficiency (EQE) of 18.5 +/- 0.1%.
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