期刊
ORGANIC ELECTRONICS
卷 15, 期 11, 页码 3327-3332出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2014.09.009
关键词
Single layer; Phosphorescent materials; Organic light-emitting diode; Ambipolar host; Morphological stability; Recombination zone
资金
- National Science Council [NSC 102-3113-E-001-001, NSC 102-2627-E-002-002, NSC 102-2221-E-011-142, NSC 102-2511-S-131-002, NSC 102-2221-E-131-030-MY2, NSC 102-2221-E-131-026-MY2, MOST 103-2627-E-002-002, MOST 103-2622-E-131-007-CC3]
The authors report a small molecule host of 2,7-bis(diphenylphosphoryl)-9-[4-(N, N-diphenylamino)phenyl]-9-phenylfluorene (POAPF) doped with 8 wt% iridium(III)-bis[(4,6-difluorophenyl)pyridinato-N,C-2']picolinate (FIrpic) for use in efficient and single-layer blue phosphorescent organic light-emitting diodes (PHOLEDs) exhibiting a maximum external quantum efficiency of similar to 20.3% at brightness of 100 cd/m(2). The high performance of such single layer PHOLEDs is attributed to the POAPF host's high morphological stability, suitable triplet energy level, and equal charge carrier mobilities of hole and electron to form the broad carrier recombination zone in the emitting layer, thus reducing the triplet-triplet annihilation and resulting in a slight efficiency roll off of 0.5% from the brightness of 1 and 1000 cd/m(2). This work also systematically investigated the arrangement of the POAPF:FIrpic recombination zone for optimizing the performance of the single layer PHOLED. (C) 2014 Elsevier B.V. All rights reserved.
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