ZnO-doped yellow phosphor compound for enhancing phosphor-conversion layer's performance in white LEDs

This research paper builds upon prior investigations by introducing the utilization of ZnO particles to augment the performance of YAG:Ce phosphor films through the manipulation of tunable scattering factors. Employing Mie-scattering theory, the optical simulation works are performed to demonstrate the performance of a conventional blue-excited while Light-Emitting Diode (LED) upon the varying concentration of ZnO nanoparticles. Specifically, the study carried out the assessments on optical properties, including lumen output, color rendition ability, and light distribution uniformity with ZnO amounts ranging within 0-35 wt%. The scattering simulation of the ZnO is also presented to understand the change in the LED's optical results. Based on previously studies, the simulation inputs were determined, including wavelength of the blue LED chip, particle radii of the phosphor and ZnO, the conversion layer thickness, and the driving current of the LED. The acquired data demonstrate the capability of ZnO to enhance the scattering of lights, the angular color distribution, and lumen efficiencies of white light emitted by the LED by selecting appropriate ZnO concentration. These findings highlight the potential of ZnO for the optimization of LED technologies.