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Proceedings Paper

Comparison of Y3Al5O12:Ce0.05 phosphor coating methods for white-light-emitting diode on gallium nitride
Author(s): Jun-Ho Yum; Soo-Yeon Seo; Seonghoon Lee; Yung-Eun Sung
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Paper Abstract

White light was obtained by mixing blue light from the emission of a GaN chip and a yellow light by the fluorescence of a Y3Al5O12:Ce0.05 yellow phosphor. A uniform coating of yellow phosphor on a GaN chip and an optimized thickness of a phosphor layer were necessary for achieving efficient white LED. Several methods for coating yellow phosphor particles such as the slurry method, the settling method, the electrophoretic deposition (EPD), and the modified EPD were examined for preparing the phosphor layer. The properties of the phosphor layer prepared by these methods were examined using SEM, XRD, and photoluminescence. The intensity of white light and the harmony between blue light and yellow light were dependent on the thickness of the phosphor layer. The properties of the phosphor layer made by the EPD such as packing density, thickness and uniformity could be more easily controlled than the slurry and settling methods. Further weak adhesion strength of phosphor particles by the EPD could be overcome via the use of a UV curable PVA+ADC layer on the phosphor layer in the EPD.

Paper Details

Date Published: 5 December 2001
PDF: 10 pages
Proc. SPIE 4445, Solid State Lighting and Displays, (5 December 2001); doi: 10.1117/12.450029
Show Author Affiliations
Jun-Ho Yum, Kwangju Institute of Science and Technology (South Korea)
Soo-Yeon Seo, Kwangju Institute of Science and Technology (South Korea)
Seonghoon Lee, Kwangju Institute of Science and Technology (South Korea)
Yung-Eun Sung, Kwangju Institute of Science and Technology (South Korea)


Published in SPIE Proceedings Vol. 4445:
Solid State Lighting and Displays
Ian T. Ferguson; Yoon-Soo Park; Nadarajah Narendran; Steven P. DenBaars, Editor(s)

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