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Nanopatterned yttrium aluminum garnet phosphor incorporated film for high-brightness GaN-based white light emitting diodes

Authors
Cho, Joong-yeonPark, Sang-JunAhn, JinhoLee, Heon
Issue Date
3-11월-2014
Publisher
ELSEVIER SCIENCE SA
Keywords
White light emitting diodes; Moth-eye structures; Direct printing; YAG phosphor incorporated film; Spin-on glass
Citation
THIN SOLID FILMS, v.570, pp.326 - 329
Indexed
SCIE
SCOPUS
Journal Title
THIN SOLID FILMS
Volume
570
Start Page
326
End Page
329
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/96801
DOI
10.1016/j.tsf.2014.03.065
ISSN
0040-6090
Abstract
In this study, we fabricated high-brightness white light emitting diodes (LEDs) by developing a nanopatterned yttrium aluminum garnet (YAG) phosphor-incorporated film. White light can be obtained by mixing blue light from a GaN-based LED and yellow light of the YAG phosphor-incorporated film. If white light sources can be fabricated by exciting proper yellow phosphor using blue light, then these sources can be used instead of the conventional fluorescent lamps with a UV source, for backlighting of displays. In this work, a moth-eye structure was formed on the YAG phosphor-incorporated film by direct spin-on glass (SOG) printing. The moth-eye structures have been investigated to improve light transmittance in various optoelectronic devices, including photovoltaic solar cells, light emitting diodes, and displays, because of their anti-reflection property. Direct SOG printing, which is a simple, easy, and relatively inexpensive process, can be used to fabricate nanoscale structures. After direct SOG printing, the moth-eye structure with a diameter of 220 nm was formed uniformly on the YAG phosphor-incorporated film. As a result of moth-eye patterning on the YAG phosphor-incorporated film, the light output power of a white LED with a patterned YAG phosphor-incorporated film increased to up to 13% higher than that of a white LED with a non-patterned film. (C) 2014 Elsevier B. V. All rights reserved.
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공과대학 (신소재공학부)
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