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Proceedings Paper

Optical modeling with precise spatial-chromatic light distribution in phosphor-converted white LEDs
Author(s): Ching-Cherng Sun; Yu-Yu Chang; Yu-Huan Wang; Ching-Yi Chen; Yi-Chien Lo; Han-Hsiang Cheng
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Paper Abstract

White light LEDs become more and more important in display and lighting in various structures. Here a new modeling algorithm for phosphor-converted white light-emitting diodes (pcW-LEDs) is proposed, aiming to perform accurate simulation for color appearance, where potentially enabling optical designers to remove yellowish/bluish spots in LED lighting. The proposed modeling method is applied to simulate a pcW-LED with a hemi spherical lens. The simulation accurately predicts the blue and yellow light distribution. The model is further verified by applying a total internal reflector lens to the pcW-LED. In the midfield region, the blue and yellow light distribution exhibit large variations as the observation distance changed; this varying light pattern for both the blue and yellow lights can be accurately predicted by using the proposed model. The well-established optical model should facilitate designing a pcW-LED that features high-quality illumination and enhances color uniformity.

Paper Details

Date Published: 3 September 2015
PDF: 6 pages
Proc. SPIE 9578, Current Developments in Lens Design and Optical Engineering XVI, 95780V (3 September 2015); doi: 10.1117/12.2188092
Show Author Affiliations
Ching-Cherng Sun, National Central Univ. (Taiwan)
Yu-Yu Chang, National Central Univ. (Taiwan)
Yu-Huan Wang, National Central Univ. (Taiwan)
Ching-Yi Chen, National Central Univ. (Taiwan)
Yi-Chien Lo, National Central Univ. (Taiwan)
Han-Hsiang Cheng, National Central Univ. (Taiwan)

Published in SPIE Proceedings Vol. 9578:
Current Developments in Lens Design and Optical Engineering XVI
R. Barry Johnson; Virendra N. Mahajan; Simon Thibault, Editor(s)

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