Lensfree OLEDs with over 50% external quantum efficiency via external scattering and horizontally oriented emitters

被引：105
作者：
Song, Jinouk [1 ]
Kim, Kwon-Hyeon [2 ]
Kim, Eunhye [1 ]
Moon, Chang-Ki [2 ]
Kim, Yun-Hi [3 ,4 ]
Kim, Jang-Joo [2 ]
Yoo, Seunghyup [1 ]
机构：
[1] Korea Adv Inst Sci & Technol, Sch Elect Engn, Daejeon 34141, South Korea
[2] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151744, South Korea
[3] Gyeongsang Natl Univ, Dept Chem, Jinju 66701, South Korea
[4] Gyeongsang Natl Univ, ERI, Jinju 66701, South Korea
来源：
NATURE COMMUNICATIONS | 2018年 / 9卷
基金：
新加坡国家研究基金会;
关键词：
D O I：
10.1038/s41467-018-05671-x
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
High efficiency is important for successful deployment of any light sources. Continued efforts have recently made it possible to demonstrate organic light-emitting diodes with efficiency comparable to that of inorganic light-emitting diodes. However, such achievements were possible only with the help of a macroscopic lens or complex internal nanostructures, both of which undermine the key benefits of organic light-emitting diodes as an affordable planar light source. Here we present a systematic way to achieve organic light-emitting diodes with ultrahigh efficiency even only with an external scattering film, one of the simplest low-cost outcoupling structures. Through a global, multivariable analysis, we show that scattering with a high degree of forwardness has a potential to play a critical role in realizing ultimate efficiency. Combined with horizontally oriented emitters, organic light-emitting diodes equipped with particle-embedded films tailored for forward-intensive scattering achieve a maximum external quantum efficiency of 56%.
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页数：10
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