Manipulating heat transport of photoluminescent composites in LEDs/LDs

Abstract

Photoluminescent composites play a critical role of light converters in light-emitting devices, especially in high-power light-emitting diodes and laser diodes, while the nonradiative Stokes loss in photoluminescent particles not only generates thermal phonons with temperature rise but also degrades their photonic/electronic properties. Moreover, these micro/nanoscale heat sources are usually dispersed in a low-thermal-conductivity polymer matrix, which makes it tough to dissipate heat out efficiently, resulting in significant thermal quenching. Reinforcing the heat dissipation of photoluminescent composites is considerably important and challenging since their optical performance will be easily damaged by the thermal reinforcement processes. In this Perspective, we briefly introduce the heat generation and transportation mechanisms in photoluminescent composites and then emphasize the recent progresses in heat manipulation of photoluminescent composites. Finally, we outline some challenges and possible solutions for addressing the thermal management of photoluminescent composites as well as some future directions in this field.