Dy 3+ /Ce 3+ 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 (Dy 0.03 Ce x Y 0.97− x ) 3 Al 5 O 12 transparent ceramics were fabricated using vacuum reactive sintering method. Importantly, these Dy 3+ /Ce 3+ codoped yttrium aluminum garnet ( YAG ) transparent ceramics served as single‐composition tunable white‐light phosphors for UV ‐ LED s is developed for the first time. By combining with commercially available UV ‐ LED s directly, the optimal chromaticity coordinates and correlated color temperature ( CCT ) are ( x  = 0.33, y  = 0.35) and 5609 K, respectively. Notably, the codoping of Ce 3+ enhances the luminescent intensity of Dy 3+ ions while excited at 327 nm. The emission color of YAG transparent ceramics can be tuned from white to yellow through energy transfer between Dy 3+ and Ce 3+ . These new phosphors, possessing of pure CIE chromaticity and environmentally friendly nature, are promising for applications in white UV ‐ LED s.