Solid laser lighting with high photoelectric conversion efficiency and compact size has been increasingly vital in lighting applications. Extensive research has been conducted to obtain high-quality color converters for application to high-power and high-luminance laser lighting. Currently, Y3Al5O12:Ce3+ phosphor in glass (Ce:PiG) and Y3Al5O12:Ce3+ phosphor-in-glass film (Ce:PiF) possessing high efficiency, low cost, easy fabrication, and controllable chromaticity are becoming the most mainstream research directions. In this study, by modifying the glass particle size and sintering temperature, investigating the relevant host glass, and so forth, high-performance Ce:PiG was developed through a one-step co-sintering technology. It possesses a high internal quantum efficiency, approaching 100% of the original phosphors (92.5%). The luminous efficacy (LE) of the Ce:PiG was 240 lm/W at 2.18 W/mm2 under 450 nm blue laser diode (LD) excitation, which is the best result yet reported. Furthermore, to enhance the laser saturation threshold, the fabricated Ce:PiF relying on a sapphire substrate can withstand an 8 W/mm2 blue incident power density. The obtained sample can even reach an LE of 251.5 lm/W, which is an obvious improvement to Ce:PiG. In addition, the result, an LD module combined with the sample that meets the standard white light source, indicates that this work has good prospects for white laser lighting.

No abstract

No abstract

Phosphor-in-glass (PiG) film has been proposed as an ideal color converter in laser diodes (LDs) lighting for its advantages of outstanding thermal conductivity (TC) and superior efficiency. Herein, yellow-emitting Y 1.31 Ce 0.09 Gd 1.6 Al 5 O 12 (Ce: GdYAG)-PiG composite films are successfully elaborated through a practical blade-coating approach. Systematical studies are performed on its microstructure, thermal stability, and luminescence performance pumped by LDs. Noteworthy, the highest internal quantum efficiency of film (94.2%) retains 97.1% of the raw phosphors (97%). Particularly, by further introducing micrometer BN with high TC as light scattering center to enhance heat dissipation and increase porosity, the thermal and optical properties of the sample are greatly improved. The luminescence intensity of the sample at 423 K is increased to 1.8 times that at 298 K. The thermal diffusion (TD) and TC of the sample are increased from 1.571 to 4.227 mm 2 s −1 and 6.4 to 13.0 W m −1 K −1 , respectively. At the same time, the maximum saturation threshold under laser irradiation of Ce: GdYAG + micrometer BN composite film is raised from 3.12 to 5.42 W mm −2 and 260.6 to 354.1 lm, respectively. The combination of excellent optical and thermal performances, coupled with facile and low-cost synthetic strategy, could push forward the practical application in solid-state laser lighting.

No abstract