Thermoresponsive scattering coating for smart white LEDs

Jurica Bauer, Paul P C Verbunt, Wan Yu Lin, Yang Han, My Phung Van, Hugo J. Cornelissen, Joan J.H. Yu, Cees W.M. Bastiaansen, Dirk J. Broer

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)
135 Downloads (Pure)


White light emitting diode (LED) systems, capable of lowering the color temperature of emitted light on dimming, have been reported in the literature. These systems all use multiple color LEDs and complex control circuitry. Here we present a novel responsive lighting system based on a single white light emitting LED and a thermoresponsive scattering coating. The coated LED automatically emits light of lower correlated color temperature (CCT) when the power is reduced. We also present results on the use of multiple phosphors in the white light LED allowing for the emission of warm white light in the range between 2900 K and 4150 K, and with a chromaticity complying with the ANSI standards (C78.377). This responsive warm white light LED-system with close-to-ideal emission characteristics is highly interesting for the lighting industry.

Original languageEnglish
Pages (from-to)A1868-A1879
Number of pages12
JournalOptics Express
Issue number25
Publication statusPublished - 1 Jan 2014


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