Fabrication of the dispersed hollow polymer scattering layer for enhancing the light out-coupling of organic light-emitting diodes. (4th March 2018)

• Record Type: Journal Article
• Authors: Ban, Uk Hyeon; Kim, Dong Woo; Han, Joo Won; Kim, Yong Hyun; Park, Chan; Gal, Yeong-Soon; Lim, Kwon Taek
• Is Part Of: Molecular crystals and liquid crystals. Volume 663(2018)
• Page Start: 182
• Page End: 189
• Publication Date: 2018-03-04
• Subjects: Hollow particle -- light out-coupling -- OLED -- scattering layer; Molecular crystals -- Periodicals; Liquid crystals -- Periodicals; Liquid crystals; Molecular crystals; Periodicals; 548
• DOI: 10.1080/15421406.2018.1470714
• Languages: English
• ISSNs: 1542-1406

Abstract

ABSTRACT: A scattering layer is fabricated onto organic light emitting diodes (OLEDs) by using dispersed particles of cross-linked hollow polymers in a poly (methylmethacrylate) (PMMA) matrix to enhance the light extraction efficiency from OLEDs. The cross-linked hollow polymer particles were prepared by the organic-inorganic nanocomposite approach. First, silica nanoparticles of ca. 500 nm in size were prepared, and then cross-linked polymer shells of poly (butyl methacrylate) were formed on the particles by dispersion polymerization. The HF solution was used to etch the core template. The hollow polymeric particles dispersed in the PMMA solution was spin-coated on a glass substrate. After fabricating the OLED, the current efficiency was improved by 18% with 10 wt% content of hollow particles in the scattering layer, while it was improved by 8% with 30 wt% content of the particles. The hollow polymer scattering layer showed improved optical properties since the hollow particles allow light transmission through their hollow inner part and reflect the light by their solid shell.