Phosphor in glasses with Pb-free silicate glass powders as robust color-converting materials for white LED applications

Abstract

Phosphor-in-glass (PiG) typed robust color converters were fabricated using Pb-free silicate glasses for high-power white LED applications. SiO2-B2O3-RO(R = Ba, Zn) glass powder showed good sintering behavior and high visible transparency under the sintering condition of 750 degrees C for 30 min without noticeable interaction with phosphors. By simply changing the thickness of the PiG plate or mixing ratio of glass to Y3Al5O12:Ce3+ phosphor, CIE chromaticity coordinates of the LED can be easily controlled. Enhanced thermal quenching property of PiG compared to phosphor with conventional silicone resin suggests its prominent feasibility for high-power/high-brightness white LEDs. (C) 2012 Optical Society of America