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.

Speckle-Free, Angle-Free, Cavity-Free White Laser with a High Color Rendering Index

“…To the best of our knowledge, only a few reports have been published regarding white RLs, ,, especially investigating their CRI and R9 values. Most of the previous studies found to calculate the CRI are from conventional lasers. , While a recent paper introduced the simple fabrication of a pure and stable white RL, the investigations on the critical factors and physical mechanism of its superior characteristics to conventional laser have not been thoroughly evaluated. By using the four monochromatic polymer films, the result suggests that white RL can not only provide an almost uniform chromaticity, as shown in the previous study but also have good performance and a high CRI under different pumping energy, whether under or above the threshold.…”

Optical spectrum investigations of LED backlight display panels and the blue light hazard

“…One approach is to mix the optical radiation from LEDs with the appropriate colors, each emitting a relatively narrow spectrum of blue, green, or red light to create a spectral power distribution that appears white. The other approach is to generate the white spectrum by using phosphor materials [2,3] together with a blue LED. When a phosphor material used in white LEDs is illuminated by blue light, it emits yellow light with a reasonably broad spectral power distribution.…”