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학술지 A Nanoporous Polymer Film as a Diffuser as well as a Light Extraction Component for Top Emitting Organic Light Emitting Diodes with a Strong Microcavity Structure
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표범, 주철웅, 김형석, 권병화, 이정익, 이종희, 서민철
Nanoscale, v.8 no.16, pp.8575-8582
Royal Society of Chemistry (RSC)
16PB1100, 에너지 절감을 위한 외광효율이 최대 100% 향상된 OLED용 광추출 기초 원천기술 개발, 이정익
To improve the viewing angle characteristic as well as the light extraction effect of strong microcavity devices, we fabricated a 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 a strong microcavity effect by changing the thickness of the hole transport layer (HTL; e.g. 30 nm and 60 nm) to investigate two different scattering effects of the NPF. Very interestingly, we could observe a significant enhancement of the external quantum efficiency (EQE) for each device (30 nm thick HTL: 18.0%, 60 nm thick HTL: 31.6%) when we attached a NPF formed on a 125 μm thick PET film coated with the NPF. Furthermore, the NPF successfully suppressed the viewing angle dependence to realize ideal angular emission even in the two extreme microcavity conditions although they are still different from that of a Lambertian distribution.
KSP 제안 키워드
Angle dependence, External Quantum Efficiency, Microcavity devices, Microcavity effect, Nanoporous polymer, Organic light-emitting diodes(OLEDS), PET film, Polymer films, Scattering effect, Scattering medium, hole transport layer