유기발광다이오드의 광효율 향상을 위한 친환경외부광추출 필름
Eco-friendly External Light Extraction Films for Enhanced Out-Coupling Efficiency of Organic Light Emitting Diodes
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초록
본 연구에서는 친환경 소재인 hydroxyethyl cellulose(HEC)와 glycerol을 활용하여 유기발광다이오드(OLED：organic lightemitting diode)의 광효율 향상을 위한 외부 광추출 필름을 제작했다. 기존 microlens array(MLA) 몰드에 HEC 및 glycerol 기반소재를 임프린팅하여 GHEC MLA 외부 광추출 필름을 제작하였다. GHEC MLA 필름이 OLED 소자의 외부양자효율 및 전류효율에미치는 효과를 평가한 결과, GHEC MLA 필름을 부착하지 않은 소자에 비해 약 20% 향상됨을 확인했다. 또한, GHEC MLA 필름은수 분 내로 물에 완전히 해리되는 우수한 친환경 특성을 입증하였다. 이를 통해 친환경 및 무독성의 GHEC MLA 필름은 차세대OLED 광효율 향상 기술에 적용되어 활용될 수 있음을 제안한다.
Abstract
In this study, we fabricated external out-coupling films for organic light emitting diodes (OLEDs) using ecofriendlymaterials, hydroxyethyl cellulose (HEC) and glycerol to improve the light extraction efficiency of OLEDs. HEC and glycerol-based microlens array (GHEC MLA) films were fabricated by imprinting method. The effect ofGHEC MLA film on the external quantum and current efficiency of OLEDs were evaluated, and we found that thelight-emitting performances of devices with the GHEC MLA film were improved by approximately 20% comparedto those without the film. Furthermore, the GHEC MLA film exhibited excellent dissociation properties, completelydissolving in water within a few minutes, thus establishing its eco-friendliness. Hence, we propose that this GHECMLA film could be employed as an eco-friendly and non-toxic light extraction film for next-generation OLEDs.
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