Low driving voltage white organic light-emitting diodes with high efficiency and low efficiency roll-off

被引：18

作者：

Zhang, Zhensong ^{[1
]}

Yan, Pingrui ^{[1
]}

Yue, Shouzhen ^{[1
]}

Chen, Yu ^{[1
]}

Wu, Qingyang ^{[1
]}

Qu, Dalong ^{[1
]}

Guo, Runda ^{[1
]}

Wang, Peng ^{[1
]}

Zhao, Yi ^{[1
]}

Liu, Shiyong ^{[1
]}

机构：

[1] Jilin Univ, Coll Elect Sci & Engn, State key Lab Integrated Optoelect, Changchun 130012, Peoples R China

来源：

ORGANIC ELECTRONICS | 2013年 / 14卷 / 09期

基金：

美国国家科学基金会;

关键词：

White light; High efficiency; Low operating voltage; Low efficiency roll-off; Charge carrier balance; TRIPLET EXCITONS; DEVICES; BLUE; ORANGE; STATE; EMISSION; HOST;

D O I：

10.1016/j.orgel.2013.05.024

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Single emission layer white organic light-emitting diodes (WOLEDs) showing high color stability, low turn-on voltage, high efficiency and low efficiency roll-off by incorporating iridium(III) bis[(4,6-difluo-rophenyl)-pyridinato-N, C-2] (FIrpic) and bis(2-phenylbenzothiazolato) (acetylacetonate) iridium(III) (Ir(BT)(2)(acac)) phosphors dyes have been demonstrated. Our WOLEDs without any out-coupling schemes as well as n-doping strategies show low operating voltages, low turn-on voltage (defined for voltage to obtain a luminance of 1 cd/m(2)) of 2.35 V, 79.2 cd/m(2) at 2.6 V, 940.5 cd/m(2) at 3.0 V and 10300 cd/m(2) at 4.0 V, respectively, and achieve a current efficiency of 40.5 cd/A, a power efficiency of 42.6 lm/W at a practical brightness of 1000 cd/m(2), and a low efficiency roll-off 14.7% calculated from the maximum efficiency value to that of 5000 cd/m(2). Such improved properties are attributed to phosphors assisted carriers transport for achieving charge carrier balance in the single light-emitting layer (EML). Meanwhile the host-guest energy transfer and direct exciton formation process are two parallel pathways serve to channel the overall excitons to dopants, greatly reduced the unfavorable energy losses. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：2172 / 2176

页数：5

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