Enhancement of Light Extraction from Organic Light-Emitting Diodes by SiO2 Nanoparticle-Embedded Phase Separated PAA/PI Polymer Blends. (13th June 2019)

• Record Type: Journal Article
• Authors: Tu, Trang T.K; Han, Joo Won; Kim, Dong Woo; Jeong, Yeun Tae; Gal, Yeong Soon; Bach, Long Giang; Kim, Yong Hyun; Lim, Kwon Taek
• Is Part Of: Molecular crystals and liquid crystals. Volume 686(2019)
• Page Start: 55
• Page End: 62
• Publication Date: 2019-06-13
• Subjects: light extraction -- nanoparticles -- phase separation -- nanopores and nanopillars -- Poly(amic acid)/Polyimide (PAA/PI); Molecular crystals -- Periodicals; Liquid crystals -- Periodicals; Liquid crystals; Molecular crystals; Periodicals; 548
• DOI: 10.1080/15421406.2019.1648036
• Languages: English
• ISSNs: 1542-1406

Abstract

Abstract: Using the phase separation of a binary immiscible polymer blend of poly(amic acid) and polyimide in combination with SiO2 nanoparticles, we have designed random nanopore and nanopillar patterns by a simple spin-coating technique. The spontaneously formed pattern structure was investigated by an atomic force microscope technique, which enhanced the external quantum efficiency of conventional green OLEDs up to a highest factor of 1.42. This enhancement is mainly attributed to the reduction of the total internal reflection at the interface of glass and air by the polymer hybrid layer on the backside of OLED devices. This work provides a new and practical approach to the development of efficient external outcoupling structures for OLEDs.