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Proceedings Paper

Packaging efficiency analysis of phosphor-converted white LEDs
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Paper Abstract

In this paper, we present our study in packaging efficiency for phosphor-converted white LED (pcW-LED). Then the limit of luminous efficacy of a pcW-LED in different types of packaging is estimated. In the calculation, the EQE of the blue die is assumed 81% and the Stokes loss is counted, we obtain the limit of luminous efficacy, which reaches 300 lm/W, when the color appearance is green-white and the corresponding CCT is between 4000K to 5000K. More consideration for practical limit take consideration of phosphor quantum loss and geometry loss, and the limit of luminous for CRI around 60 is around 240 lm/W, and for CRI larger than 80 is around 175 lm/W.

Paper Details

Date Published: 26 September 2014
PDF: 7 pages
Proc. SPIE 9192, Current Developments in Lens Design and Optical Engineering XV, 91920S (26 September 2014); doi: 10.1117/12.2063770
Show Author Affiliations
Ching-Cherng Sun, National Central Univ. (Taiwan)
Yu-Yu Chang, National Central Univ. (Taiwan)
Cheng-Chien Chen, National Central Univ. (Taiwan)
Ching-Yi Chen, National Central Univ. (Taiwan)
Tsung-Hsun Yang, National Central Univ (Taiwan)

Published in SPIE Proceedings Vol. 9192:
Current Developments in Lens Design and Optical Engineering XV
R. Barry Johnson; Virendra N. Mahajan; Simon Thibault, Editor(s)

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