Stable and Color-Tailorable White Light from Blue LEDs Using Color-Converting Phosphor-Glass Composites

Commercial Ce3+:YAG phosphors were embedded in glass frits. Thermal condition for the viscous sintering of the composite materials was optimized. The phosphor-glass composites had maximum external efficiency of 30% and maximum light extraction efficiency of 39%. Color temperatures of the composites composed of fluorescent glass frits containing Eu3+ and Mn2+ combined with blue LEDs shifted from similar to 7000 to similar to 4000K.