Prediction of intensity and color degradation of LEDs

Miran Bürmen; Franjo Pernuš; Boštjan Likar

doi:10.1117/12.698987

13 February 2007 Prediction of intensity and color degradation of LEDs

Miran Bürmen, Franjo Pernuš, Boštjan Likar

Proceedings Volume 6486, Light-Emitting Diodes: Research, Manufacturing, and Applications XI; 64860M (2007) https://doi.org/10.1117/12.698987
Event: Integrated Optoelectronic Devices 2007, 2007, San Jose, California, United States

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.

Citation Download Citation

Miran Bürmen, Franjo Pernuš, and Boštjan Likar "Prediction of intensity and color degradation of LEDs", Proc. SPIE 6486, Light-Emitting Diodes: Research, Manufacturing, and Applications XI, 64860M (13 February 2007); https://doi.org/10.1117/12.698987

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