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Journal of Optics

, Volume 42, Issue 4, pp 355–359 | Cite as

Degradation analysis of commercial low power LEDs

  • P. R. YawaleEmail author
  • A. D. Shaligram
Research Article

Abstract

LEDs are used in a wide variety of applications. The modern high power LEDs demonstrates long lifetimes and robustness to atmospheric conditions and shocks. As high power LEDs are very useful in reduction of energy consumption a great deal of research has been carried out to understand their degradation rate. However there is very little published work on low power commercial LEDs. In this paper we report the analysis of electrical and optical degradation of low power aged LEDs. Electrical and optical characterization includes I-V measurement, optical output verses aging time, optical output verses operating current and spectral characteristics. It is observed that the forward bias voltage increases with increasing aging time and this effect is observed earlier in the LEDs which are overstressed. The spectral response shows shifting of peak wavelength slightly with age and decrease of light output also observed as function of aging.

Keywords

Degradation Defects Peak wavelength Bulk resistance LED life 

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Copyright information

© Optical Society of India 2013

Authors and Affiliations

  1. 1.Department of ElectronicsA.M. CollegePune 28India
  2. 2.Department of Electronic ScienceUniversity of PunePune 7India

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