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Proceedings Paper

Prediction of intensity and color degradation of LEDs
Author(s): Miran Bürmen; Franjo Pernuš; Boštjan Likar
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Paper Abstract

In this paper, a current-accelerated method for fast estimation of the intensity and color degradation with corresponding variability of light-emitting diodes (LEDs) is presented. The method is based on automated periodical spectral measurements of emitted light of LEDs under different current loads, which include nominal and several different above nominal currents. The intensity and color degradation and corresponding variability among different LEDs at a specified current are estimated by detailed analysis of the acquired spectral data at above nominal currents. The method was validated by comparing the predicted values with the measured values at nominal current. The proposed method was tested on white LEDs (luminous intensity ranged from 5 to 20 cd) from five manufacturers (Nichia, Etgtech, Sansen, Daina, and Velleman). The results show that the intensity and color degradation and corresponding variability among different LEDs is significant and, therefore, should be considered with great care when designing highly demanding lighting products.

Paper Details

Date Published: 13 February 2007
PDF: 10 pages
Proc. SPIE 6486, Light-Emitting Diodes: Research, Manufacturing, and Applications XI, 64860M (13 February 2007); doi: 10.1117/12.698987
Show Author Affiliations
Miran Bürmen, Univ. of Ljubljana (Slovenia)
Franjo Pernuš, Univ. of Ljubljana (Slovenia)
Boštjan Likar, Univ. of Ljubljana (Slovenia)


Published in SPIE Proceedings Vol. 6486:
Light-Emitting Diodes: Research, Manufacturing, and Applications XI
Klaus P. Streubel; Heonsu Jeon, Editor(s)

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