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학술지 Importance of Purcell Factor for Optimizing Structure of Organic Light-emitting Diodes
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저자
조현수, 정진, 송진욱, 이재호, 이현구, 이종희, 문제현, 유승협, 조남성
발행일
201904
출처
Optics Express, v.27 no.8, pp.11057-11068
ISSN
1094-4087
출판사
Optical Society of America(OSA)
DOI
https://dx.doi.org/10.1364/OE.27.011057
협약과제
18PB3200, 그래핀 소재의 OLED 투명전극과 박막봉지 적용을 위한 2세대 이상 기판 기반의 플렉서블 OLED 소자/패널 기초 및 응용 기술 개발, 이정익
초록
The ratio of spontaneous emission inside a diode structure to that in free space is called the Purcell factor (F({\\lambda})). The structure of organic light-emitting diodes (OLEDs) has a significant influence on the spontaneous emission rate of dipole emitters. Therefore, to describe the optical properties of OLEDs, it is essential to incorporate F({\\lambda}) in the description. However, many optical studies on OLEDs continue to be conducted without considering F({\\lambda}) for simplicity's sake. Hence, in this study, using carefully designed bottom- and top-emitting OLEDs, we show that the external quantum efficiency obtained without considering F({\\lambda}) can be over- or under-estimated, and in some cases, the margin of error may be significant. We also reveal that the subtle distribution of the electroluminescence spectrum can be explained properly only by including F({\\lambda}). Both these results stipulate the importance of including F({\\lambda}) to maintain a quantitative agreement between theoretical and experimental data. Hence, the inclusion of F({\\lambda}) is important for designing OLEDs with enhanced efficiency or desired spectral characteristics.
KSP 제안 키워드
Electroluminescence spectrum, Experimental Data, External Quantum Efficiency, Free Space, Optical Studies, Organic light-emitting diodes(OLEDS), Purcell factor, Spectral characteristics, Top-emitting OLEDs, enhanced efficiency, light-emitting diode(LED)