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학술지 A Randomly Nano-structured Scattering Layer for Transparent Organic Light Emitting Diodes
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저자
허진우, 신진욱, 조두희, 문제현, 주철웅, 박승구, 황주현, 조남성, 이종희, 한준한, 추혜용, 이정익
발행일
201410
출처
Nanoscale, v.6 no.18, pp.10727-10733
ISSN
2040-3364
출판사
Royal Society of Chemistry (RSC)
DOI
https://dx.doi.org/10.1039/c4nr01520g
협약과제
14PB2400, 그래핀 소재의 OLED 투명전극과 박막봉지 적용을 위한 기판 사이즈 5.5세대 이상의 그래핀 필름 및 OLED 소자/패널 기초 및 응용 기술 개발, 이정익
초록
A random scattering layer (RSL) consisting of a random nano-structure (RNS) and a high refractive index planarization layer (HRI PL) is suggested and demonstrated as an efficient internal light-extracting layer for transparent organic light emitting diodes (TOLEDs). By introducing the RSL, a remarkable enhancement of 40% and 46% in external quantum efficiency (EQE) and luminous efficacy (LE) was achieved without causing deterioration in the transmittance. Additionally, with the use of the RSL, the viewing angle dependency of EL spectra was reduced to a marginal degree. The results were interpreted as the stronger influence of the scattering effect over the microcavity. The RSL can be applied widely in TOLEDs as an effective light-extracting layer for extracting the waveguide mode of confined light at the indium tin oxide (ITO)/OLED stack without introducing spectral changes in TOLEDs. © the Partner Organisations 2014.
KSP 제안 키워드
External Quantum Efficiency, Nano-structured, Organic light-emitting diodes(OLEDS), Scattering effect, Scattering layer, Spectral changes, Waveguide mode, high refractive index, indium tin oxide(ITO), light-emitting diode(LED), luminous efficacy