Highly Efficient White Top-Emitting Organic Light-Emitting Diodes Comprising Laminated Microlens Films

被引：133
作者：
Thomschke, Michael [1 ]
Reineke, Sebastian [1 ]
Luessem, Bjoern [1 ]
Leo, Karl [1 ]
机构：
[1] Tech Univ Dresden, Inst Angew Photophys, D-01069 Dresden, Germany
来源：
NANO LETTERS | 2012年 / 12卷 / 01期
关键词：
Organic semiconductors; outcoupling; organic light-emitting diodes; optoelectronic devices; white OLEDs; top-emission; MICROCAVITIES; SIMULATION; EMISSION;
D O I：
10.1021/nl203743p
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
White top-emitting organic light-emitting diodes (OLEDs) attract much attention, as they are optically independent from the substrate used. While monochrome top-emitting OLEDs can be designed easily to have high-emission efficiency, white light emission faces obstacles. The commonly used thin metal layers as top electrodes turn the device into a microresonator having detrimental narrow and angular dependent emission characteristics. Here we report on a novel concept to improve the color quality and efficiency of white top-emitting OLEDs. We laminate a refractive index-matched microlens film on the top-emitting device. The microlens film acts both as outcoupling-enhancing film and an integrating element, mixing the optical modes to a broadband spectrum.
引用
收藏
页码：424 / 428
页数：5
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