Thermoresponsive scattering coating for smart white LEDs

H,J. Cornelissen, J. Yu, G. Cennini, J. Bauer, P.P.C. Verbunt, C.W.M. Bastiaansen, D.J. Broer

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Abstract

A novel responsive lighting system is presented capable of lowering the color temperature of emitted light on dimming. It is based on a single white light emitting LED and a thermo-responsive scattering coating. The coated LED automatically emits light of lower correlated color temperature (CCT) when the power is reduced, while maintaining a chromaticity close to the black body curve. Existing systems all use multiple color LEDs, additional control circuitry and mixing optics. An optical ray tracing model can explain the experimental results.

Original languageEnglish
Title of host publicationFourteenth International Conference on Solid State Lighting and LED-based Illumination Systems
PublisherSPIE
ISBN (Print)9781628417371
DOIs
Publication statusPublished - 2015
Event14th International Conference on Solid State Lighting and LED-based Illumination Systems, August 12-13, 2015, San Diego, CA, USA - San Diego, CA, United States
Duration: 12 Aug 201513 Aug 2015

Publication series

NameProceedings of SPIE
Volume9571

Conference

Conference14th International Conference on Solid State Lighting and LED-based Illumination Systems, August 12-13, 2015, San Diego, CA, USA
CountryUnited States
CitySan Diego, CA
Period12/08/1513/08/15

Keywords

  • black body line
  • correlated color temperature
  • liquid crystal
  • Phosphor converted white LED
  • scattering particles
  • thermo-optical materials
  • thin films
  • warm dimming

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  • Cite this

    Cornelissen, HJ., Yu, J., Cennini, G., Bauer, J., Verbunt, P. P. C., Bastiaansen, C. W. M., & Broer, D. J. (2015). Thermoresponsive scattering coating for smart white LEDs. In Fourteenth International Conference on Solid State Lighting and LED-based Illumination Systems [957106] (Proceedings of SPIE; Vol. 9571). SPIE. https://doi.org/10.1117/12.2189030