Fast sintering method of phosphor-in-glass for high-power LEDs

Abstract Fast sintering of Phosphor-in-Glass (PiG) by means of CO 2 laser heating has been successfully achieved. PiGs samples fabricated at different exposure times were characterized and compared with a PiG sample synthetized through an electric furnace. An exposure time as short as 30 s and 12 W of optical power is necessary to sintering PiGs. Results show that the optimization of CO 2 laser approach can dramatically reduce up to 60 times the PiGs sintering. Luminous Efficacy (LE) of at least 79.7 lm/W as well as minimum Color Rendering Index (CRI) value of 70 for all fabricated PiGs were obtained. Correlated Color Temperature (CCT) value decreased gradually as the CO 2 laser exposure time increased. These results show that PiGs samples, synthetized with short exposure times, show excellent lighting properties.