High-Efficiency White LED Packaging With Reduced Phosphor Concentration

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...

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Bibliographic Details
Published inIEEE photonics technology letters Vol. 25; no. 7; pp. 694 - 696
Main Authors Chen, Ching-Yi, Yang, Tsung-Hsun, Hsu, Chien-Hung, Sun, Ching-Cherng
Format Journal Article
LanguageEnglish
Published IEEE 01.04.2013
Subjects
Cavity resonators
Encapsulation
Lenses
Light emitting diodes
Phosphors
photon recycling
Reflectivity
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Summary: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.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2013.2248141