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A Review on the Reliability of GaN-Based LEDs

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4 Author(s)
Meneghini, M. ; Dept. of Inf. Eng., Univ. of Padova, Padova ; Trevisanello, L.-R. ; Meneghesso, G. ; Zanoni, E.

We review the degradation mechanisms that limit the reliability of GaN-based light-emitting diodes (LEDs). We propose a set of specific experiments, which is aimed at separately analyzing the degradation of the properties of the active layer, of the ohmic contacts and of the package/phosphor system. In particular, we show the following: 1) low-current density stress can determine the degradation of the active layer of the devices, implying modifications of the charge/deep level distribution with subsequent increase of the nonradiative recombination components; 2) high-temperature storage can significantly affect the properties of the ohmic contacts and semiconductor layer at the p-side of the devices, thus determining emission crowding and subsequent optical power decrease; and 3) high-temperature stress can significantly limit the optical properties of the package of high-power LEDs for lighting applications.

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Device and Materials Reliability, IEEE Transactions on  (Volume:8 ,  Issue: 2 )