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학술지 The Formation of An Optically Functional Nano-lens Array by Substrate Surface Treatment
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박영삼, 조두희
Journal of Materials Science : Materials in Electronics, v.31 no.3, pp.2331-2336
20HB1400, 디스플레이 일체형 투명 틀렉서블 복합 생체인식 디바이스 핵심기술 개발, 안성덕
Recently, a nano-lens array (NLA) technology has been developed to greatly enhance light extraction efficiencies and color stabilities of red, green and blue organic light-emitting diodes. The fabrications of N,N??-Di(1-naphthyl)-N,N??-diphenyl-(1,1??-biphenyl)-4,4??-diamine (C44H32N2, NPB) NLAs on oxide layers were accomplished by an organic vapor phase deposition during which surface tensions of NPB were increased by its crystallization. To emphasize the importance of the fabrication technology, the kinds of substrate materials on which NLAs are formed should be extended to high surface energy nitrides. Herein, to understand the role of the surface condition of a silicon nitride substrate in the formation of NLA, three types of nitride substrates are prepared by using surface treatment, while one NPB deposition recipe is used. Very interestingly, even though nano-lens is not observed in an untreated substrate with high surface energy, nano-lens is formed by surface treatment and the resulting decrease in surface energy. This indicates that NLA formation is not limited to an oxide substrate, but is determined by the difference in surface energy values between a substrate and a deposited material on the substrate. Furthermore, the morphological change of NPB by surface treatment is extensively discussed using contact angle experiments.
KSP 제안 키워드
Contact angle(CA), Lens array, Organic light-emitting diodes(OLEDS), Oxide layer, Silicon nitride substrate, Substrate material, Substrate surface, Surface conditions, Surface tension(ST), Surface treatments, extraction efficiency