Development of waste glass frits-based phosphor in glass system for solid-state lighting

Abstract. Laser-based solid-state lighting is the future of the high-brightness lighting and long-distance automobile
illumination industry. It has started replacing light-emitting diode (LED)-based lighting equipment with high thermal
stabilities and transparencies, i.e., phosphor in glass (PiG). PiGs have received special attention because of their simple
fabrication process and easy colour tuning. The study of glass is usually conducted in the field of phosphor fabrication,
with very limited studies on its recycling. We demonstrated the utilization of rejected glass from other sources due to
scratches, cracks and defects by some other means by recycling with the development of PiGs. The waste glass slides were
crushed into fine powders, and the pulverized samples were sieved to an average particle size of 30 lm. Fine glass frits
were mixed with Ce-doped Y3Al5O12 and sintered at 730C for 30 min to refabricate glass as a PiG to overcome the
recycling route for waste glass. A prototype design of laser-driven PiGs (LD-PiGs) has been developed for white light
generation. Different concentrations of YAG:Ce (20–50%) in fine glass frits had colour rendering indices (CRIs)[60. The
25 wt.% YAG:Ce-developed PiG pellet showed better results than the other compositions in terms of photoluminescence
emission intensity, CRI 69, colour-correlated temperature 5566 K and colour coordinates (0.331, 0.3328). PiG pellets are
much better than YAG:Ce and UV-adhesive matrix screens printed on glass substrates used as white light sources.
LD-PiGs exhibit superior thermal robustness.