Nanopatterned yttrium aluminum garnet phosphor incorporated film for high-brightness GaN-based white light emitting diodes
- Authors
- Cho, Joong-yeon; Park, Sang-Jun; Ahn, Jinho; Lee, Heon
- Issue Date
- Nov-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://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/158747
- 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.
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