Efficient single-layer "twistacene"-doped polymer white light-emitting diodes

被引：142

作者：

Xu, QF ^{[1
]}

Duong, HM

Wudl, F

Yang, Y

机构：

[1] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA

[2] Univ Calif Los Angeles, Exot Mat Inst, Los Angeles, CA 90095 USA

[3] Univ Calif Los Angeles, Dept Chem & Biochem, Los Angeles, CA 90095 USA

来源：

APPLIED PHYSICS LETTERS | 2004年 / 85卷 / 16期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.1808250

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Bright, efficient, and stable white polymer light-emitting diodes based on blue polyfluorene doped by a "twistacene," 6, 8, 15, 17-tetraphenyl-1.18, 4.5, 9.10, 13.14-tetrabenzoheptacene (3) (TBH), are demonstrated. In "twistacene" the terminal pyrene moieties serve two functions: (i) to stabilize the inherently unstable heptacene and (ii) to enable the oligoacene to be a strongly fluorescent molecule. As a result, efficient and very bright white polymer light-emitting diodes are obtained. The maximum luminance of the devices exceeds 20 000 cd/m(2). The maximum luminous efficiency is 3.55 cd/A at 4228 cd/m(2) while the maximum power efficiency is 1.6 lm/W at 310 cd/m(2). The device obtains a stable white balance by a combination of energy transfer from the blue polyfluorene to TBH by 1% TBH doping plus the host emission. The device emission color is not a function of bias current, which is ideal for various applications, from lighting to the backlight for liquid crystal displays. (C) 2004 American Institute of Physics.

引用

页码：3357 / 3359

页数：3

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