Hostname: page-component-586b7cd67f-dlnhk Total loading time: 0 Render date: 2024-11-30T20:14:27.519Z Has data issue: false hasContentIssue false
  • English
  • Français

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: [email protected])
Get access

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 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Ye, S., Xiao, F., Pan, Y.X., Ma, Y.Y., Zhang, Q.Y., Mat. Sci. Eng. R 71, 1 (2010)Google Scholar
Silver, J. and Withnall, R., Color Conversion Phosphors for LEDs, Chapter 3, in Luminescent Materials and Applications, Edited by Kitai, A., John Wiley and Sons Ltd. (2008)Google Scholar
Schubert, E.F., Light Emitting Diodes, Second Edition, Cambridge University Press (2006)Google Scholar
Fasol, G. and Nakamura, S., The Blue Laser Diode: GaN Based Blue Light Emitters and Lasers, Springer, Berlin (1997)Google Scholar
Im, W.B., Kim, Y., Fellows, N.N., Masui, H., Hirata, G.A., DenBaars, S.P. and Seshadri, R., Appl. Phys. Letts. 93, 091905 (2008)Google Scholar
Yen, W.M., Shionoya, S., Yamamoto, H., Phosphor Handbook, CRC Press, Boca Raton, FL, USA (2007)Google Scholar
Yen, W.M. and Weber, M.J., Inorganic Phosphors: Compositions, Preparation and Optical Properties, CRC Press (2004)Google Scholar
Dutta, P.S., U.S. Patent 8974695 (2015)Google Scholar
Wyszecki, G. and Stiles, W.S., Color Science: Concepts and Methods, Quantitative Data and Formulas (Wiley, New York, 1967)Google Scholar
Tsao, J. Y., Coltrin, M. E., Crawford, M. H., Simmons, J. A., Proc. IEEE, 98, 1162 (2010)CrossRefGoogle Scholar