Analysis of the spectral degradation of LEDs emissions under temperature stress conditions

Giovanni Mazzanti, Gaetano Pasini, Lorenzo Peretto, Roberto Tinarelli

Abstract

This paper presents the experimental results of an accelerated-life-test carried out on colored LEDs under temperature stress conditions. The main purpose of the work has been to investigate over the dependence of their reliability vs. their color. A deep analysis of the time variation of spectral components (RGB) under thermal stress has shown that the spectral components for each colored LED change in a different way over time. The main conclusion of this work is that the reliability of LEDs is strongly affected by the procedure and elements used for coloring the LED yielding to have different reliabilities for different colors.

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IMEKO TC

TC10 - Measurement for Diagnostics, Optimization and Control

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