Thermal Aging Performance Analyses of High Color Rendering Index of Glass-Based Phosphor-Converted White-Light-Emitting Diode

This paper reported the high-temperature performances of glass-based phosphor-converted warm-white light-emitting diodes (PC-WWLEDs). The fabrication and characteristics of low-temperature phosphor (Yellow:Ce:³⁺:YAG, Greed:Tb³⁺:YAG, Red:CaAlClSiN₃:Eu²⁺) doped glass were presented for high color rendering indexes warm-white-light-emitting diodes. As demonstrated, the PC-WLEDs maintained good thermal stability at the high temperature operation; the characterization results of color coordinates (x, y) = (0.32, 0.28) is as follows: quantum yield (QY) = 55%, color rending index (CRI) = 85, and correlated color temperature (CCT) = 3900 K. The results showed that the PC-WLEDs maintained good thermal stability at the high temperature operation. The QY decay, CRI attenuation and chromaticity shift in glass-based high-power PC-WLEDs were also compared with those of silicone-based counterparts thermally aged at 150 °C and 250 °C. These results indicated that the glass-based PC-WLEDs exhibited better thermal stability than the silicone. The color rendering indexes (CRIs) of glass phosphor hopefully have potential used as a phosphor layer for high-performance and low-cost PC-WLEDs for the next-generation indoor solid-state lighting applications.