Dy3+/Ce3+ Codoped YAG Transparent Ceramics for Single-Composition Tunable White-Light Phosphor

Superior optical, thermal, and mechanical properties of transparent ceramics are very important in the applications of solid lasers, solid-state lighting, and transparent armors. Herein, a series of (Dy0.03CexY0.97-x)(3)Al5O12 transparent ceramics were fabricated using vacuum reactive sintering method. Importantly, these Dy3+/Ce3+ codoped yttrium aluminum garnet (YAG) transparent ceramics served as single-composition tunable white-light phosphors for UV-LEDs is developed for the first time. By combining with commercially available UV-LEDs directly, the optimal chromaticity coordinates and correlated color temperature (CCT) are (x=0.33, y=0.35) and 5609K, respectively. Notably, the codoping of Ce3+ enhances the luminescent intensity of Dy3+ ions while excited at 327nm. The emission color of YAG transparent ceramics can be tuned from white to yellow through energy transfer between Dy3+ and Ce3+. These new phosphors, possessing of pure CIE chromaticity and environmentally friendly nature, are promising for applications in white UV-LEDs.