Correlated Color Temperature Tunable White Led With A Dynamic Color Filter

Abstract

We proposed a new device structure to dynamically tune the correlated color temperature (CCT) of a white light-emitting-diode (WLED). The key component is a dynamic color filter, consisting of a liquid crystal (LC) cell sandwiched between two cholesteric LC films whose Bragg reflection band covers the blue wavelength of the WLED. When a voltage is applied to the LC cell, the transmittance of blue light is changed, while the longer wavelength part remains unaffected, resulting in a tunable CCT. Validated by experiment, our design exhibits several advantages, such as reasonably wide tuning range (6916K to 3253K), low operation voltage (∼3.2 V), simple device configuration, and low cost. It is a strong contender for next generation smart lighting.

Publication Date

3-21-2016

Publication Title

Optics Express

Volume

24

Issue

6

Number of Pages

A731-A739

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/OE.24.00A731

Socpus ID

84962709899 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84962709899

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