Title

Tuning the correlated color temperature of white LED with a guest-host liquid crystal

Authors

Authors

H. W. Chen; Z. Y. Luo; R. D. Zhu; Q. Hong;S. T. Wu

Comments

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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. (C) 2015 Optical Society of America

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

WOS:000354706800057

ISSN

1094-4087

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