The thermal and optical characteristics of phosphor converted white light-emitting diodes (LEDs) with different phosphor concentrations ranging from to are investigated. The light output of LEDs with higher phosphor concentration is found to have larger degradation in constant current compared with pulse current than that with lower phosphor concentration. In addition, the junction temperatures of phosphor converted white LEDs raise with increasing phosphor concentration, so that the decreased phosphor conversion efficiency is observed both in pulse and constant current modes. The physical mechanisms for these observations are discussed. This study elucidates the phosphor dependent optical and thermal behavior of phosphor converted white LEDs.
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September 2010
Research Papers
Phosphor Concentration Effects on Optothermal Characteristics of Phosphor Converted White Light-Emitting Diodes
Jiun Pyng You,
Jiun Pyng You
Optoelectronics Packaging and Materials Laboratories,
e-mail: jpyou@uci.edu
University of California
, 916 Engineering Tower, Irvine, CA 92697
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Yeong-Her Lin,
Yeong-Her Lin
Optoelectronics Packaging and Materials Laboratories,
e-mail: yeonghel@uci.edu
University of California
, 916 Engineering Tower, Irvine, CA 92697
Search for other works by this author on:
Nguyen T. Tran,
Nguyen T. Tran
Optoelectronics Packaging and Materials Laboratories,
e-mail: ntran3000@yahoo.com
University of California
, 916 Engineering Tower, Irvine, CA 92697
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Frank G. Shi
Frank G. Shi
Optoelectronics Packaging and Materials Laboratories,
e-mail: fgshi@uci.edu
University of California
, 916 Engineering Tower, Irvine, CA 92697
Search for other works by this author on:
Jiun Pyng You
Optoelectronics Packaging and Materials Laboratories,
University of California
, 916 Engineering Tower, Irvine, CA 92697e-mail: jpyou@uci.edu
Yeong-Her Lin
Optoelectronics Packaging and Materials Laboratories,
University of California
, 916 Engineering Tower, Irvine, CA 92697e-mail: yeonghel@uci.edu
Nguyen T. Tran
Optoelectronics Packaging and Materials Laboratories,
University of California
, 916 Engineering Tower, Irvine, CA 92697e-mail: ntran3000@yahoo.com
Frank G. Shi
Optoelectronics Packaging and Materials Laboratories,
University of California
, 916 Engineering Tower, Irvine, CA 92697e-mail: fgshi@uci.edu
J. Electron. Packag. Sep 2010, 132(3): 031010 (4 pages)
Published Online: September 30, 2010
Article history
Received:
November 9, 2009
Revised:
June 16, 2010
Online:
September 30, 2010
Published:
September 30, 2010
Citation
You, J. P., Lin, Y., Tran, N. T., and Shi, F. G. (September 30, 2010). "Phosphor Concentration Effects on Optothermal Characteristics of Phosphor Converted White Light-Emitting Diodes." ASME. J. Electron. Packag. September 2010; 132(3): 031010. https://doi.org/10.1115/1.4002298
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