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학술대회 Improvement of Viewing Angle Dependence and Out-Coupling Efficiency of OLEDs with Strong Microcavity Structure by Introduction of Nanoporous Polymer Films
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저자
표범, 김형석, 주철웅, 권병화, 이정익, 이종희, 서민철
발행일
201605
출처
Society for Information Display (SID) International Symposium 2016, pp.1792-1795
DOI
https://dx.doi.org/10.1002/sdtp.11068
협약과제
16PB1100, 에너지 절감을 위한 외광효율이 최대 100% 향상된 OLED용 광추출 기초 원천기술 개발, 이정익
초록
To improve a viewing angle characteristic as well as a light extraction effect, we fabricated nanoporous polymer film (NPF) as a scattering medium as well as a light extraction component. We designed two types of organic light emitting diodes (OLEDs) with strong microcavity effect containing two different hole transport layer (HTL) thickness (e.g. 30 nm and 60 nm) to investigate each optical behavior of NPF. Very interestingly, we could observe a significant enhancement of external quantum efficiency (EQE) for each device [30 nm thick HTL: 18.0%, 60nm thick HTL: 31.6%] when we attached 125 um thick PET film coated with NPF. Furthermore, NPF successfully suppress the viewing angle dependence to realize ideal angular emission even though it's somehow different from that of Lambertian distribution.
키워드
Diffuser, Light extraction, Light scattering, Strong microcavity
KSP 제안 키워드
Angle dependence, External Quantum Efficiency, Microcavity effect, Nanoporous polymer, Optical behavior, Organic light-emitting diodes(OLEDS), PET film, Polymer films, Scattering medium, hole transport layer, light extraction