Effect of a boron nitride reflective layer on the optical and thermal performance of full-spectrum white LEDs

Full-spectrum white LEDs are gaining popularity as a solution for health lighting. However, they still face challenges such as low light output and thermal stability. Boron nitride (BN) nanoparticle doping has been widely used to enhance the light efficiency and stability of conventional LEDs. However, there is currently a lack of systematic research on the effect of boron nitride particles on the optical and thermal performance of full-spectrum white-light LEDs. In this paper, full-spectrum white LED devices containing a BN-doping reflective layer were fabricated. The effects of the BN doping concentration on the devices' light efficiency, color temperature, and thermal stability were discussed in detail. The data prove that increasing the concentration of BN doping can improve the luminescence efficiency and thermal stability of the device. In particular, at a BN doping concentration of 10%, the luminescence efficiency is 16% higher and the surface temperature is 29.4°C lower than that of devices without the BN-doping reflective layer. The experiment conducted under both cold and hot environments demonstrates that the BN-doping reflective layer can effectively suppress the T-droop effect caused by high temperature. As a result, the device consistently maintains a higher cold-to-heat ratio compared to devices without the BN-doping reflective layer.