색변환 백색 OLED의 광추출 효율 향상을 위한 마이크로 렌즈 어레이 필름

Abstract

We demonstrate high performance down-conversion microlens array (DC-MLA) films for white organic light-emitting diodes (OLEDs). The DC-MLA films are readily fabricated by an imprinting method based on breath figure patterns which are directly formed on the polymer substrate with a novel concept. The DC-MAL films result in high quality white light as well as enhanced light outcoupling efficiency for white OLEDs. The power efficiency of OLEDs with DC-MLA films is increased by a factor of 1.86 compared to OLEDs without outcoupling films. Moreover, the white OLEDs with DC-MLA films achieve a high color rendering index of 84.3. It is anticipated that the novel DC-MLA films fabricated by the simple imprinting process with breath figure patterns can contribute to the development of efficient white OLEDs.