Publication Date:
2015-07-15
Description:
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-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 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-LEDs.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
