Impact of die carrier on reliability of power LEDs

TL;DR

This study evaluates how different die carrier materials affect the thermal management and reliability of high-power LEDs, focusing on junction temperature, lifetime, and emission stability.

Contribution

It provides a comparative analysis of various carrier materials' impact on LED performance and reliability, including alumina, aluminium nitride, silicon, and diamond.

Findings

Diamond carriers improve heat extraction and reliability.

Higher junction temperatures reduce LED lifetime and stability.

Material choice significantly influences LED performance metrics.

Abstract

High power light emitting diodes (LEDs) suffer from heating effects that have a detrimental impact on the devices characteristics. The use LED carriers with high thermal conductivity promotes the extraction of heat away from the LED junction. Different materials can be used for this purpose, such as alumina, aluminium nitride, and silicon. Diamond has also been gaining momentum for demanding heat management applications. In order to evaluate the impact of the different carriers on the reliability of the devices, the junction temperature of Cree white Xamp XB-D LEDs was obtained with Ansys for various carrier at different LED current levels. The impact of the junction temperature on the LEDs lifetime, emission intensity, footprint and wavelength stability was then evaluated for each carrier based on the datasheet of the devices. The results provide additional knowledge regarding the impact of the carrier on the performance of the LED.