期刊
THIN SOLID FILMS
卷 516, 期 12, 页码 4288-4292出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2007.09.038
关键词
single-layer organic light-emitting diode; phenyldipyrenylphosphine oxide; ambipolar carrier transport; electroluminescence; exciton quenching
We investigated the carrier transport and recombination characteristics of single-layer organic light-emitting diodes (SLOLEDs) composed of a phenyldipyrenylphosphine oxide (POPy2) layer doped with orange fluorescent molecules of 2,5-bis-[bis-(4-methoxy-phenyl)-amino}-styryl]-terephthalonitrile (BST). The SLOLEDs achieved a high external quantum efficiency of 1.6% and a high luminance of 24,000 cd/m(2) at a low driving voltage of 8 V These very good electrolummescence characteristics originate from factors that include our use of the following: (1) the ambipolar POPy2 layer, which can transport balanced amounts of electrons and holes, (2) a high BST-doping concentration that traps injected carriers on BST molecules, and (3) insertion of an undoped POPy2 layer next to a metallic cathode to prevent exciton quenching. (c) 2007 Elsevier B.V. All rights reserved.
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