Abbreviated Journal Title
Opt. Express
Keywords
CADMIUM SELENIDE NANOCRYSTALS; ELECTRIC-FIELD; EMISSION; DISPLAYS; GREEN; DYES; RED; Optics
Abstract
We demonstrate an electro-optic method to tune the correlated color temperature (CCT) of white light-emitting-diode (WLED) with a color conversion film, consisting of fluorescent dichroic dye doped in a liquid crystal host. By controlling the molecular reorientation of dichroic dyes, the power ratio of the transmitted blue and red lights of the white light can be accurately manipulated, resulting in different CCT. In a proof-of-concept experiment, we showed that the CCT of a yellow phosphor-converted WLED can be tuned from 3200 K to 4100 K. With further optimizations, the tuning range could be enlarged to 2500 K with fairly good color performance: luminous efficacy of radiation (LER) > 300 lm/W, color rendering index (CRI) > 75, and Duv < 0.005. Besides, the operation voltage is lower than 5 V and good angular color uniformity is achieved with remote-phosphor coating. This approach is promising for next generation smart lighting.
Journal Title
Optics Express
Volume
23
Issue/Number
10
Publication Date
1-1-2015
Document Type
Article
Language
English
First Page
13060
Last Page
13068
WOS Identifier
ISSN
1094-4087
Recommended Citation
Chen, Haiwei; Luo, Zhenyue; Zhu, Ruidong; Hong, Qi; and Wu, Shin-Tson, "Tuning the correlated color temperature of white LED with a guest-host liquid crystal" (2015). Faculty Bibliography 2010s. 6462.
https://stars.library.ucf.edu/facultybib2010/6462
Comments
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