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A design methodology for phosphor mixtures for tunable spectrum LEDs

Published online by Cambridge University Press:  11 August 2016

Partha S. Dutta  and
Kathryn M. Liotta
Partha S. Dutta*
Affiliation:
Smart Lighting Engineering Research Center, Rensselaer Polytechnic Institute, Troy, New York, 12180, USA Auterra Inc, Schenectady, New York, 12308, USA
Kathryn M. Liotta
Affiliation:
Smart Lighting Engineering Research Center, Rensselaer Polytechnic Institute, Troy, New York, 12180, USA
*
*(Email: duttap@rpi.edu)
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Abstract

Spectrum tuning in phosphor converted white light emitting diodes (pc-WLED) is done by mixing powders of phosphor compounds (with different emission wavelengths) in different weight ratios. In this paper, a new methodology for designing unique full spectrum phosphor mixtures (with fixed weight ratios of different emission phosphor) has been presented that could provide a wide range of pc-WLED spectrum. This is done by optimizing the excitation and emission spectra of the phosphor compounds used in the mixture. A unique phosphor mixture comprising of Eu2+ and Ce3+-Na1+ activated compounds of SrGa2S4, CaGa2S4, SrS, CaS and CaF2 was used to produce full spectrum warm, neutral and cool white LEDs with color temperatures between 2500 K and 7500 K and with color rendering index exceeding 95.

Keywords

luminescenceabsorptionpowder
Type
Articles
Information
MRS Advances , Volume 1 , Issue 50: Electronics and Photonics , 2016 , pp. 3435 - 3440
Copyright
Copyright © Materials Research Society 2016 

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References

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