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Proceedings Paper

Next-generation high-reliability laser light engine by glass phosphor-converted layer (Conference Presentation)
Author(s): Yung-Peng Chang; Jin-Kai Chang; Wei-Chih Cheng; Chun-Nien Liu; Li-Yin Chen; Wood-Hi Cheng

Paper Abstract

A new scheme of high-reliability laser light engine (LLE) employing a novel glass-based phosphor-converted layer is proposed and demonstrated. The LLE module consists of a high-power blue light laser array and a color wheel, which includes two glass-based phosphor-converted layers of yellow Ce:YAG and green Ce:LuAG and a micro motor. The combinations of blue, yellow, and green lights produce high-purity phosphor-converted white-laser-diodes (PC-WLDs). The lumen degradation and chromaticity shift in the glass-based phosphor-converted layer under different laser powers are presented and compared with those of silicon-based PC-WLDs. The results showed that the glass based PC-WLDs exhibited in lower lumen loss and less chromaticity shifts than the silicon-based PC-WLDs. The long term reliability study evaluation in glass- and silicone-based PC-WLDs under high-power 120 W at room temperature for 20,000 hours is also presented and compared. The result showed that the silicone-based PC-WLDs exhibited 50% in lumen decay which failed in operation, while the glass-based PC-WLDs only exhibited 2% in lumen decay. This indicates that the proposed LLE modules are benefit to employ in the area where the silicone-based material fails to stand for long and strict reliability is highly required. This study demonstrates the advantages of adapting novel glass as a phosphor-converted color wheel in the LLE modules that provide unique high-reliability as well as better performance for use in the next-generation laser projector system.

Paper Details

Date Published: 29 November 2016
PDF: 1 pages
Proc. SPIE 9954, Fifteenth International Conference on Solid State Lighting and LED-based Illumination Systems, 995407 (29 November 2016); doi: 10.1117/12.2235625
Show Author Affiliations
Yung-Peng Chang, Taiwan Color Optics, Inc. (Taiwan)
National Chung Hsing Univ. (Taiwan)
Jin-Kai Chang, National Sun Yat-Sen Univ. (Taiwan)
Wei-Chih Cheng, Taiwan Color Optics Inc. (Taiwan)
Chun-Nien Liu, National Chung Hsing Univ. (Taiwan)
Li-Yin Chen, National Sun Yat-Sen Univ. (Taiwan)
Wood-Hi Cheng, National Chung Hsing Univ. (Taiwan)

Published in SPIE Proceedings Vol. 9954:
Fifteenth International Conference on Solid State Lighting and LED-based Illumination Systems
Matthew H. Kane; Nikolaus Dietz; Ian T. Ferguson, Editor(s)

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