期刊
ORGANIC ELECTRONICS
卷 13, 期 12, 页码 2807-2815出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2012.08.031
关键词
Fluorescent blue emitter; Hybrid white organic light-emitting diodes; High efficiency and CRI; Emission mechanism
资金
- Science Fund for Creative Research Groups of NSFC [20921061]
- National Natural Science Foundation of China [50973104, 60906020, 21161160442, 61036007, 60937001]
- Ministry of Science and Technology of China (973 program) [2009CB623604, 2009CB930603]
- Foundation of Jilin Research Council [20090127, 201105028]
We present a simple hybrid white organic light-emitting diodes (WOLED) consisting of only two layers, i.e., a hole-transporting layer and an emitting layer. The emitting layer is formed by simply co-doping a green phosphor and a red phosphor in bis[2-(2-hydroxyphenyl)-pyridine]beryllium (Bepp(2)), which acts as the blue emitter, electron-transport material, and high triplet energy host for the phosphors, i.e., a multifunctional chromophore. This simple device exhibits a maximum power and quantum efficiency of 46.8 lm W-1 and 16.5%, respectively, with a good CRI up to 90. The versatile experimental techniques are performed to gain a deep understanding of the emission mechanism. We believe that this simple design concept can provide a new avenue for achieving ultrahigh performance WOLEDs for lighting application. (C) 2012 Elsevier B.V. All rights reserved.
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