Intensified synthetic approach for GdYAG:Ce phosphors with ultrahigh color rendering toward healthy lighting

Process intensified synthetic approach for synthesizing gadolinium and cerium co-doped yttrium aluminum garnet (GdYAG:Ce) phosphors in white light-emitting diodes (wLED) is developed. By using a high-gravity rotating packed bed (RPB) reactor for preparation of sol-gel precursors, the significantly enhanced molecular mixing allows precise control and tuning of dry gel with designed structure to obtain nanosized particles of GdYAG:Ce precursors, which are prone to low temperature quick sintering process and therefore reduce the energy consumption of the electric furnace 76% compared to solid phase method. By analyzing the effect of cycling times and high gravity levels of RPB reactor on sintering and crystallization, sintering condition for emission spectrum adjustable GdYAG:Ce phosphors is optimized. Prototype devices based on blue chips and GdYAG:Ce phosphors exhibit high color rendering index of 83.8 and low correlation color temperature of 5357 K that are beneficial for creating a healthy and comfortable lighting environment.