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학술지 Random Nano-Structures as Light Extraction Functionals for Organic Light-Emitting Diode Applications
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저자
신진욱, 조두희, 문제현, 주철웅, 박승구, 이종희, 한준한, 조남성, 황주현, 허진우, 추혜용, 이정익
발행일
201401
출처
Organic Electronics, v.15 no.1, pp.196-202
ISSN
1566-1199
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.orgel.2013.11.007
협약과제
13VB2200, 환경/감성형 OLED 면조명 기술, 추혜용
초록
In this study, we demonstrated a nano-structured random scattering layer (RSL) as an internal light extraction method to improve the light extraction efficiency of organic light-emitting diodes (OLEDs). Using dewetted Ag droplets as a hard mask, we textured the glass surface to have a scattering layer of the random structure. OLEDs equipped with the RSL showed more that 50% improvement in the external quantum efficiency (EQE) and luminance efficacy (LE) compared to OLEDs without the RSL. This improvement can be understood by the scattering effect which reduces the optical loss at wave-guided modes. Also, by combining the RSL and an external light extraction micro-lens array (MLA), it was possible to achieve further improvements of 105.8% and 92.06% in the EQE and the LE, respectively. © 2013 Elsevier B.V. All rights reserved.
키워드
Dewetting process, Light extraction, OLED, Planarization layer, Random nano-structure, Scattering layer
KSP 제안 키워드
Dewetting process, External Quantum Efficiency, External light, Extraction method, Glass surface, Guided mode, Microlens array, Nano-structured, Optical loss, Organic light-emitting diodes(OLEDS), Random structure