Phosphor-Converted Laser-Based Illuminant With High Color Rendering Index and Low Blue Light Hazard

Abstract

Laser-based illuminant has been a topic of increasing interest in recent years and both of color quality and blue light hazards are the key issues that need to be addressed. In this paper, the performances of color quality and blue light hazard were investigated by comparing 465 nm laser-excited phosphor materials and traditional 452 nm laser-excited phosphor materials respectively. Phosphor-converted laser-based illuminant (pc-LBI) consisting of 465-nm and 635-nm LDs (LBI-465) has a color rendering index (CRI) of 88.7, which was 8.2% higher than that of pc-LBI consisting of 452-nm and 635-nm LDs (LBI-452). The correlated color temperature (CCT) of white light of both pc-LBIs ranges from 2200 K to 5000 K with the adjustment of red lasers. The blue light hazard efficiency of radiation (BLHER) of LBI-465 is below 0.15, which is 19% lower than that of LBI-452. The results showed that high color quality and low blue light hazard were simultaneously achieved by LBI-465. In addition, the above experimental results are in good agreement with the simulated results. Based on these above results, pc-LBI is believed to render laser-based white light sources with good color performance and boost the growth of solid-state lighting.