title: Preparation of a photo-degradation- resistant quantum dot-polymer composite plate for use in the fabrication of a high-stability white-light-emitting diode.
abstract: We report on the synthesis of highly fluorescent double-ZnS-shell-capped, yellow-emitting Cu-In-S quantum dots (QDs) with a surprisingly high quantum yield of 92%, the preparation of a free-standing QD-polymethylmethacrylate composite plate, and the application of the QD plate in the fabrication of QD-based white-light-emitting diodes (WLEDs). A free-standing QD plate with QDs embedded uniformly inside a polymeric matrix is used to fabricate a remote-type, resin-free WLED. The QD plate-based WLED displays a high luminous efficiency; however, it suffers from a significantly unstable device performance due to QD degradation upon prolonged photo-excitation. An exceptional operational stability of the QD plate-based WLED is realized by generating hybrid double layers of an organic adhesion layer and a gas barrier layer of sol-gel-derived silica, rendering the QD plate impermeable to oxygen. Our success in achieving a color converter robust against photo-degradation and applying it in the fabrication of a reliable QD-based LED is greatly encouraging as regards the development of next-generation QD-based LED lighting sources.
authors.affiliation: Department of Materials Science and Engineering, Hongik University, Seoul 121-791, Korea.
authors.forename: Eun-Pyo
authors.initials: EP
authors.lastname: Jang
authors.forename: Woo-Seuk
authors.initials: WS
authors.lastname: Song
authors.forename: Ki-Heon
authors.initials: KH
authors.lastname: Lee
authors.forename: Heesun
authors.initials: H
authors.lastname: Yang
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008029:Lighting / Q000295:instrumentation*; D050997:Nanomedicine; D011108:Polymers / Q000737:chemistry* / Q000528:radiation effects; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D045663:Quantum Dots; D012666:Semiconductors
chemical_list: D011108:Polymers; D019904:Polymethyl Methacrylate