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Journal Article
고효율 상부발광 올레드 응용을 위한 유기 나노렌즈의 형성 거동
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- Authors
- 박영삼
- Issue Date
- 2021-01
- Citation
- 폴리머, v.45, no.1, pp.129-133
- ISSN
- 0379-153X
- Publisher
- 한국고분자학회
- Language
- Korean
- Type
- Journal Article
- Abstract
- 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.
- KSP Keywords
- 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)