DocumentCode
78836
Title
High-Efficiency White LED Packaging With Reduced Phosphor Concentration
Author
Chen, Ching-Yi ; Yang, Tsung-Han ; Hsu, Chia-Hsun ; Sun, Ching-Cherng
Author_Institution
Institute of Lighting and Display Science and the Department of Optics and Photonics, National Central University, Jhongli, Taiwan
Volume
25
Issue
7
fYear
2013
fDate
1-Apr-13
Firstpage
694
Lastpage
696
Abstract
In this letter, important factors for white light emitting diodes (LED) packaging, including lens encapsulation, reflectivity of cavity reflectors, and phosphor concentration are studied. Simulation as well as the corresponding experiment shows that reflectivity of the reflectors in packaging cavity is more effective than lens encapsulation to reach high efficiency. Besides, a white LED packaging without lens encapsulation but with high reflectivity of cavity reflectors may increase interaction possibility between blue photons and the phosphor so that the phosphor concentration can be reduced to meet the requested correlated color temperature.
Keywords
Cavity resonators; Encapsulation; Lenses; Light emitting diodes; Phosphors; Reflectivity; Light emitting diodes; phosphors; photon recycling;
fLanguage
English
Journal_Title
Photonics Technology Letters, IEEE
Publisher
ieee
ISSN
1041-1135
Type
jour
DOI
10.1109/LPT.2013.2248141
Filename
6473826
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