Long-term lumen depreciation behavior and failure modes of multi-die array LEDs

Asiri Jayawardena; Daniel Marcus; Ximena Prugue; Nadarajah Narendran

doi:10.1117/12.2030671

30 September 2013 Long-term lumen depreciation behavior and failure modes of multi-die array LEDs

Asiri Jayawardena, Daniel Marcus, Ximena Prugue, Nadarajah Narendran

Proceedings Volume 8835, LED-based Illumination Systems; 883510 (2013) https://doi.org/10.1117/12.2030671
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

One of the main advantages of multi-die array light-emitting diodes (LEDs) is their high flux density. However, a challenge for using such a product in lighting fixture applications is the heat density and the need for thermal management to keep the junction temperatures of all the dies low for long-term reliable performance. Ten multi-die LED array samples for each product from four different manufacturers were subjected to lumen maintenance testing (as described in IES-LM-80-08), and their resulting lumen depreciation and failure modes were studied. The products were tested at the maximum case (or pin) temperature reported by the respective manufacturer by appropriately powering the LEDs. In addition, three samples for each product from two different manufacturers were subjected to rapid thermal cycling, and the resulting lumen depreciation and failure modes were studied. The results showed that the exponential lumen decay model using long-term lumen maintenance data as recommended in IES TM-21 does not fit for all package types. The failure of a string of dies and single die failure in a string were observed in some of the packages.

Citation Download Citation

Asiri Jayawardena, Daniel Marcus, Ximena Prugue, and Nadarajah Narendran "Long-term lumen depreciation behavior and failure modes of multi-die array LEDs", Proc. SPIE 8835, LED-based Illumination Systems, 883510 (30 September 2013); https://doi.org/10.1117/12.2030671

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