β-Sialon:Eu2+ phosphor-in-glass: An efficient and potential green color conversion material for laser lighting systems

Abstract With the high demand of modern people for lighting quality, higher requirements have been put forward for the lighting technology. Compared with traditional light emitting diodes (LEDs), laser diode (LD)-driven lighting technology has more prominent advantages in the fields of industry, military and life. Here, we report a phosphor-in-glass (PiG) material formed by co-firing commercial β-Sialon:Eu2+ phosphor and SiO2-Na2CO3-H3BO3-CaO (SNBC) glass. It is found that the powder perfectly dispersed in the glass without obvious interface reaction. Fluorescence intensity of PiG sintered at 800 °C is the strongest, and the position of the luminescence peak is around 540 nm. Then through the analysis of different concentrations of PiG phosphors, it is found that the internal quantum efficiency (IQE) can reach 72%. The specific heat capacity decreases with the increase of temperature, indicating that the heat dissipation effect is fine. Under the blue LD irradiation of 450 nm, the luminous flux of the PiG sample reaches 363 lm and the high luminous efficiency of 154 lm/W. Our research found that the prepared β-Sialon-PiG can provide green light for high-power laser illumination and is a stable and efficient fluorescent conversion material.