Efficient white organic light-emitting devices based on a novel phosphine oxide host with low driving voltage and excellent color stability

被引:4
作者
Guo, Runda [1 ]
Wu, Yukun [1 ]
Yan, Pingrui [1 ]
Yue, Shouzhen [1 ]
Wu, Qingyang [1 ,2 ]
Liu, Chang [1 ]
Hu, Shoucheng [1 ]
Zhao, Yi [1 ]
机构
[1] Jilin Univ, Coll Elect Sci & Engn, State Key Lab Integrated Optoelect, 2699 Qianjin St, Changchun 130012, Peoples R China
[2] Liaoning Prov Coll Commun, Dept Mech & Elect Engn, 102 Shenbei Rd, Shenyang 110122, Peoples R China
基金
中国国家自然科学基金;
关键词
WOLED; 4,6-Bis(diphenylphosphoryl)dibenzofuran; High efficiency; Color stability; Low turn-on voltage; EXCITED-STATE; DIODES; ELECTROPHOSPHORESCENCE; ENERGY;
D O I
10.1016/j.synthmet.2016.03.021
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Efficient phosphorescent white organic light-emitting devices (WOLEDs) based on a novel phosphine oxide host, 4,6-bis(diphenylphosphoryl)dibenzofuran (DBFDPO), with particularly low turn-on voltage and high color stability are reported. Without any electrical doping (p-doing or n-doping) strategies, the simplified optimal WOLEDs utilizing DBFDPO as the same host for blue/yellow emitters show low operating voltages, 1 cd/m(2) at 2.5 V (turn-on voltage), 46 cd/m(2) at 3 V and 2787 cd/m(2) at 5 V, and 12840 cd/m(2) at 7 V, respectively. A forward-viewing current efficiency (CE) of 413 cd/A (power efficiency (PE) of 34.0 lm/W) is achieved at the luminance of 673.4 cd/m(2) without any out-coupling enhancement structures. Furthermore, improved color stability is achieved through adjusting the yellow emitting layer. The Commission Internationale de I'Eclairage coordinates (CIE) of the optimal WOLED merely shift from (0.330, 0.405) to (0.327, 0.400) over a wide range of luminance (10-10,000 cd/m(2)). We have revealed that the competition of the two mechanisms of energy transfer and carrier-trapping/-assist transport severely impact on the spectra stability. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:210 / 215
页数:6
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