상세정보
학술지
Importance of Purcell Factor for Optimizing Structure of Organic Light-emitting Diodes
- 발행일
- 201904
- 출처
- Optics Express, v.27 no.8, pp.11057-11068
- ISSN
- 1094-4087
- 출판사
- Optical Society of America(OSA)
- 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)