Facile preparation and luminescence performance of transparent YAG:Ce phosphor-in-tellurate-glass inorganic color converter for white-light-emitting diodes

In this paper, the Y₃Al₅O₁₂:Ce^{3 +} (YAG) phosphor-in-glass (PIG) was successfully fabricated by one-step low-temperature co-sintering technology, which showed excellent thermal behavior and high visible transparency in the sintering case of 600 °C without noticeable interaction with phosphor. The luminescence performance of PiG-based WLEDs could be easily improved by tuning the phosphor concentration and specimen thickness. Experimental results demonstrated that the ideal phosphor content and specimen thickness are 8 wt%, 0.8 mm, respectively. Notably, the obtained WLED with an 8% phosphor content and 0.8 mm thickness exhibits a high luminous efficacy (LE) of 102.6 lm/w, a correlated color temperature (CCT) of 6290 K and a color rendering index (CRI) of 71.4, under the operating current of 20 mA. In addition, the test of temperature-dependent photoluminescence (PL) indicated that the thermal stability of PiGs was superior to the phosphor-in-silicone (PiS) up to 200 °C. Therefore, we fabricate a high transparent PiG with promising candidate for applications in the WLEDs.