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Degradation of High-Brightness Green LEDs Submitted to Reverse Electrical Stress

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5 Author(s)
Meneghini, M. ; Univ. of Padova, Padova, Italy ; Zehnder, U. ; Hahn, B. ; Meneghesso, G.
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This letter describes an extensive analysis of the reverse-bias degradation of green light-emitting diodes. The analysis consists in a wide set of stress tests carried out under different negative-bias levels. The results presented in this letter indicate the following: 1) Leakage current is strongly correlated to the presence of reverse-bias luminescence; 2) reverse current flows through preferential leakage paths and is due to a soft-breakdown mechanism that is possibly correlated to the presence of structural defects; 3) reverse-bias stress can induce an increase in the leakage current, with a corresponding decrease in the breakdown voltage of the samples; and 4) the degradation rate has a linear dependence on the (reverse) stress-current level, suggesting that degradation is induced by hot carriers. On the basis of the evidence collected in this letter, degradation can be ascribed to the generation/propagation of point defects due to the injection of highly accelerated carriers.

Published in:

Electron Device Letters, IEEE  (Volume:30 ,  Issue: 10 )

Date of Publication:

Oct. 2009

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