Improvements on Remote Diffuser-Phosphor-Packaged Light-Emitting Diode Systems

Hua Xiao; Yi-Jun Lu; Tien-Mo Shih; Li-Hong Zhu; Si-Qi Lin; Patrick J. Pagni; Zhong Chen

doi:10.1109/JPHOT.2013.2293612

IEEE Photonics Journal (Jan 2014)

Improvements on Remote Diffuser-Phosphor-Packaged Light-Emitting Diode Systems

Hua Xiao,
Yi-Jun Lu,
Tien-Mo Shih,
Li-Hong Zhu,
Si-Qi Lin,
Patrick J. Pagni,
Zhong Chen

Affiliations

Hua Xiao: <formula formulatype="inline"><tex Notation="TeX">$^{1}$</tex></formula> Department of Electronic Science, Fujian Engineering Research Center for Solid-State Lighting, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, China
Yi-Jun Lu: Department of Electronic Science, Fujian Engineering Research Center for Solid-State Lighting, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, China
Tien-Mo Shih: <formula formulatype="inline"><tex Notation="TeX">$^{2}$</tex></formula> Department of Physics, Xiamen University, Xiamen, China
Li-Hong Zhu: Department of Electronic Science, Fujian Engineering Research Center for Solid-State Lighting, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, China
Si-Qi Lin: Department of Electronic Science, Fujian Engineering Research Center for Solid-State Lighting, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, China
Patrick J. Pagni: <formula formulatype="inline"><tex Notation="TeX">$^{5}$</tex></formula> Department of Mechanical Engineering, University of California, Berkeley, CA, USA
Zhong Chen: Department of Electronic Science, Fujian Engineering Research Center for Solid-State Lighting, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, China

DOI: https://doi.org/10.1109/JPHOT.2013.2293612
Journal volume & issue: Vol. 6, no. 2
pp. 1 – 8

Abstract

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By modifying traditional remote phosphor-diffuser-packaged light-emitting diode systems, we have managed to increase the luminous efficacy from 145.7 to 162.3 lm/W. One mechanism responsible for this achievement is associated with randomizing the directions of light beams transmitting through an interior diffuser, whose position is optimized based on an overall merit. The other mechanism is identified as the gradual attenuation of the undesirable blue-ring image along the distance from the diffuser toward the phosphor base. The identification of these two mechanisms is verified by luminous efficacy measurements, 3-D image plots, and combined Monte Carlo algorithm ray tracing simulation results. In addition, merits related to correlated color temperatures and issues pertaining to costs are briefly discussed.

Published in IEEE Photonics Journal

ISSN: 1943-0655 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics; Science: Physics: Optics. Light
Website: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=4563994

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