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Journal of Display Technology

Journal of Display Technology

| A JOINT IEEE/OSA PUBLICATION

  • Editor: Shin-Tson Wu
  • Vol. 1, Iss. 1 — Sep. 1, 2005
  • pp: 167–

Life of LED-Based White Light Sources

Nadarajah Narendran and Yimin Gu

Journal of Display Technology, Vol. 1, Issue 1, pp. 167- (2005)


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Abstract

Even though light-emitting diodes (LEDs) may have a very long life, poorly designed LED lighting systems can experience a short life. Because heat at the p-n-junction is one of the main factors that affect the life of the LED, by knowing the relationship between life and heat, LED system manufacturers can design and build long-lasting systems. In this study, several white LEDs from the same manufacturer were subjected to life tests at different ambient temperatures. The exponential decay of light output as a function of time provided a convenient method to rapidly estimate life by data extrapolation. The life of these LEDs decreases in an exponential manner with increasing temperature. In a second experiment,several high-power white LEDs from different manufacturers were life-tested under similar conditions. Results show that the different products have significantly different life values.

© 2005 IEEE

ToC Category:
Research Papers

Citation
Nadarajah Narendran and Yimin Gu, "Life of LED-Based White Light Sources," J. Display Technol. 1, 167- (2005)
http://www.opticsinfobase.org/jdt/abstract.cfm?URI=jdt-1-1-167

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