期刊
ORGANIC ELECTRONICS
卷 14, 期 11, 页码 2854-2858出版社
ELSEVIER
DOI: 10.1016/j.orgel.2013.08.006
关键词
Organic light emitting; High efficiency; Low roll-off; Co-host
资金
- 973 Program [2013CB328803, 2013CB922101]
- Science and Technology Commission of Shanghai Municipal [11PJ1404900, 12JC1404900]
- National Natural Science Foundation of China [61136004]
Highly efficient green phosphorescent organic light-emitting diodes (PHOLEDs) with low efficiency roll-off at high brightness have been demonstrated with a novel iridium complex. The host material 1,3-bis(carbazol-9-yl)benzene (mCP) with high triplet energy is also used as the hole transporting layer to avoid carrier accumulation near the exciton formation interface and reduce exciton quenching. It provides a new approach for easily fabricating PHOLED with high triplet energy emitter. Moreover, the hole blocking layer is extended into the light emitting layer to form a co-host, realizing better control of the carrier balance and broader recombination zone. As a consequence, a maximum external quantum efficiency of 20.8% and current efficiency of 72.9 cd/A have been achieved, and maintain to 17.4% and 60.7 cd/A even at 10,000 cd/m(2), respectively. (C) 2013 Elsevier B. V. All rights reserved.
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