Design and development of a high-power laser-driven multiple phosphor-converted white light source with a side-by-side configuration

Phosphor-converted white light sources have become extremely popular because of their numerous applications and energy efficiency. Nevertheless, there are frequent issues with power, colour rendering indices (CRIs), lu-minous efficacy, and thermal management with the traditional design of these sources. In this study, we show the design and development of a high-power laser-driven multiple phosphor-converted white light source using a side-by-side configuration. The proposed design of a white light source with combinations of red‒green‒yellow phosphors generates white light with irradiation of 450 nm blue laser diode. The white light generated through the combination of these phosphors was analyzed in terms of its CRI, luminous efficacy, and spectral characteristics. The proposed design overcomes the shortcomings of traditional sources, offering improved power output, enhanced colour rendering capabilities, and efficient thermal management. The designed source has a photoluminance broad-emission spectrum ranging from 480-730 nm with a luminous value of 615 lux at 1.5 m in the forward direction at 45°. The developed design has CRI~80, colour temperature 5197 K (cool white light) and CIE1931 chromaticity coordinates (0.33, 0.34), which are very close to the proper white light chromaticity (0.33, 0.33). The source is less hazardous to human vision due to the lack of bright spots and uni-form illumination. The performance evaluation demonstrated the feasibility and efficacy of this approach, mak-ing it a promising illumination system for various lighting applications, such as PC-LD table lamps and auto-mobile PC-LD headlight structures.