Down-conversion light outcoupling films using imprinted microlens arrays for white organic light-emitting diodes. (January 2017)

• Record Type: Journal Article
• Authors: Oh, Ji Yoon; Kim, Jin Hee; Seo, Yoon Kyung; Joo, Chul Woong; Lee, Jonghee; Lee, Jeong-Ik; Yu, Seunggun; Yun, Changhun; Kang, Moon Hee; Choi, Bum Ho; Kim, Yong Hyun
• Is Part Of: Dyes and pigments. Volume 136(2017)
• Page Start: 92
• Page End: 96
• Publication Date: 2017-01
• Subjects: Organic light-emitting diodes -- Color conversion -- Light extraction -- White OLED -- Outcoupling structures; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2016.08.017
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: We have developed down-conversion outcoupling films to enhance the light outcoupling efficiency in white organic light-emitting diodes (OLEDs). The down-conversion outcoupling films consist of outcoupling structures and color conversion materials, which are prepared by a simple solution-based micro-imprint process and are adopted into OLEDs. The down-conversion films successfully realize white light by converting blue rays from blue phosphorescent OLED. The OLEDs based on the down-conversion films with outcoupling structures show a great improvement of power efficiency by a factor of 1.32 compared to the reference OLED based on down-conversion films without outcoupling structures. Furthermore, the influence of a concentration of color conversion materials on color rendering index of OLEDs is investigated. The results strongly indicate that readily fabricated down-conversion light outcoupling films by a simple micro-imprint process are highly promising for enhanced light extraction performance and high color rendering index of white OLEDs. Highlights: A facile approach to enhance the efficiency in white OLEDs based on down-conversion light outcoupling films is demonstrated. Down-conversion light outcoupling films are prepared with a simple micro-imprint process. Down-conversion light outcoupling films successfully produce white light with a large enhancement of the efficiency of OLEDs.