Enhanced outcoupling in down-conversion white organic light-emitting diodes using imprinted microlens array films with breath figure patterns. Issue 1 (1st January 2019)

• Record Type: Journal Article
• Authors: Han, Joo Won; Joo, Chul Woong; Lee, Jonghee; Lee, Dong Jin; Kang, Jisoo; Yu, Seunggun; Sung, Woo Jin; Cho, Nam Sung; Kim, Yong Hyun
• Is Part Of: Science and technology of advanced materials. Volume 20:Issue 1(2019)
• Page Start: 35
• Page End: 41
• Publication Date: 2019-01-01
• Subjects: Organic light-emitting diodes -- down-conversion -- light extraction -- white OLED -- outcoupling structures; 40 Optical, magnetic and electronic device materials -- 201 Electronics / Semiconductor / TCOs -- 204 Optics / Optical applications, organic light-emitting diodes; Materials -- Technological innovations -- Periodicals; 620.112
• DOI: 10.1080/14686996.2018.1551040
• Languages: English
• ISSNs: 1468-6996

Abstract

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-MLA films result in high-quality white light as well as enhanced light outcoupling efficiency for white OLEDs. The external quantum efficiency and power efficiency of OLEDs with DC-MLA films are increased by a factor of 1.35 and 1.86, respectively, 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. Graphical Abstract: