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학술지 고효율 상부발광 올레드 응용을 위한 유기 나노렌즈의 형성 거동
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저자
박영삼
발행일
202101
출처
폴리머, v.45 no.1, pp.129-133
ISSN
0379-153X
출판사
한국고분자학회
DOI
https://dx.doi.org/10.7317/pk.2021.45.1.129
협약과제
20HB3500, 500ppi급 지문인식 센서를 위한 유기포토다이오드 핵심기술 개발, 박영삼
초록
Recently, an organic nano-lens array (NLA) technology has been developed to increase light extraction efficiencies of top-emitting organic light emitting diodes (OLEDs) without the deterioration of organic films. To achieve optically efficient OLEDs, the size of NLA must be at least several hundred nanometers, explaining the importance of the understanding of formation characteristics of NLA determined by vaporizer heating conditions. Herein, nano-lens generation occurs dominantly when heating temperature increases from 300 to 320 °C. From 320 to 340 °C, its growth is predominant, which is explained by Ostwald ripening and coalescence. Additionally, as the temperature and the dwell time at target temperature increase, the area ratio of nano-lens to substrate increases, which is attributed to the increase in the amount of vapor generated during heating. With NLA, optical simulations indicate that a large amount of light is extracted otherwise trapped inside OLEDs, indicating that NLA is an optically excellent light extraction structure.
키워드
Organic light emitting diode, Organic nano-lens, Top-emitting
KSP 제안 키워드
Area ratio, Dwell Time, Extraction structure, Lens array, Optical simulation, Organic light-emitting diodes(OLEDS), Target temperature, extraction efficiency, heating temperature, light extraction, light-emitting diode(LED)