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학술지 Direct Formation of Random Wrinkle on Emission Surface for Improved Light Out Coupling and Stable Angular Spectrum of White Organic Light Emitting Diodes
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저자
강소현, 주철웅, 하병학, 김주연, 이종희, 유병곤, 조남성, 노지환, 문제현
발행일
201901
출처
Journal of Luminescence, v.205, pp.66-71
ISSN
0022-2313
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.jlumin.2018.09.003
협약과제
17ZB1900, 초저가 플렉서블 Lighting Surface 기술 개발, 유병곤
초록
To enhance the light out coupling and stabilize the angular spectrum of white organic light emitting diodes (WOLEDs), we formed a randomly distributed corrugation directly on the external glass surface. Using a metallic master, which was prepared using laser ablation, we have imprinted the corrugation pattern directly on the glass surface. Our method yields 32% increase in the external quantum efficiency, widened luminance distribution and low angular spectra variation. Considering WOLED as a lighting source, this feature is particularly appealing. Besides the implications of the spectrally stable efficient WOLEDs through random corrugation, our work suggests a new structural approach for various light applications in which efficiency and spectral stability matter.
키워드
Light extraction, Organic light emitting diodes, Transfer method, Wrinkles
KSP 제안 키워드
Angular spectrum, External Quantum Efficiency, Glass surface, Organic light-emitting diodes(OLEDS), Spectral stability, Transfer method, White organic light-emitting diodes, laser ablation, light extraction, light-emitting diode(LED), lighting source