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20 October 2004 Uniform white light distribution with low loss from colored LEDs using polymer-doped polymer mixing rods
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Abstract
Colour mixing of red, green and blue (RGB) LEDs is demonstrated for a 6 cm long PMMA cylindrical rod with a transparent refractive index matched micro particle (TRIMM) diffuser sheet at the output end. Ray tracing simulations have been performed, and the output light distributions, transmittances and losses modelled and compared with experiment. Photographed and modelled colour mixing results are presented for rods with and without TRIMM sheet mixers. The TRIMM particles homogenize the light output of plain PMMA rods to form white light, with negligible backscattering. A simple method for measuring the concentration of the particles in the diffuser sheet is described, and computer modeling and analysis of TRIMM particle systems is discussed.
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Chris A. Deller, Geoff B. Smith, and Jim B. Franklin "Uniform white light distribution with low loss from colored LEDs using polymer-doped polymer mixing rods", Proc. SPIE 5530, Fourth International Conference on Solid State Lighting, (20 October 2004); https://doi.org/10.1117/12.556282
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