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학술지 Surface Wrinkle Formation by Liquid Crystalline Polymers for Significant Light Extraction Enhancement on Quantum Dot Light-emitting Diodes
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저자
염수영, 김학전, 김기태, 주철웅, 조현진, 조현수, 최수경, 이원준, 정연식, 권병화, 나준희
발행일
202008
출처
Optics Express, v.28 no.18, pp.26519-26530
ISSN
1094-4087
출판사
Optical Society of America (OSA)
DOI
https://dx.doi.org/10.1364/OE.401328
협약과제
20PB2200, 수평분자 배열 극대화를 이용한 고효율/장수명 청색발광 소재‧소자 기술개발, 조현수
초록
We propose an optimal outcoupling structure of a quantum-dot light-emitting diode (QLED) and present material properties based on numerical calculations via the ray-tracing method, in which light extraction properties are obtained according to the surface wrinkles on a substrate. After analyzing the designed microstructure elements, the optimal model was derived and applied to the QLEDs; consequently, the outcoupling efficiency enhanced by 31%. The liquid crystalline polymer forming the random surface wrinkles not only achieves an excellent light extraction through plasma crosslinking but also facilitates large-area processes. We propose an optical design rule for high-efficiency QLED design by analyzing the electro-optical efficiency, emission spectrum, and angular radiation pattern of the optical device.
KSP 제안 키워드
Design rule, Electro-optical efficiency, Liquid-crystalline polymer(LCP), Numerical calculation, Optical devices, Optimal model, Quantum Dot(QD), Radiation Pattern, Ray tracing method, designed microstructure, emission spectrum