High-performance warm-white light-emitting diode (LED) devices are in great demand toward green and comfortable solid-state lighting. Herein, we report a creative green-emission CaY 2 HfGa(AlO 4 ) 3 :Ce 3+ phosphor. CaY 2 HfGa(AlO 4 ) 3 :Ce 3+ compounds with different cerium ion doping contents have been successfully prepared through a conventional high-temperature solid-state method, and their phase and crystal structure have been revealed via the powder X-ray diffraction and Rietveld refinement. Impressively, the CaY 2 HfGa(AlO 4 ) 3 :Ce 3+ phosphors exhibit a broad-band excitation, which well covers the wavelength region from the 300 to 500 nm, corresponding to the commercial blueemitting LED chip. Upon 450 nm excitation, the optimal CaY 2 HfGa(AlO 4 ) 3 :2%Ce 3+ sample shows an intense broad-band green emission (the corresponding testing spectral range: 460− 750 nm) with a strongest peak about 534 nm. In addition, the CaY 2 HfGa(AlO 4 ) 3 :2%Ce 3+ sample possesses a broad full width at halfmaximum equal to 120 nm; moreover, its CIE chromaticity coordinate and the internal quantum efficiency are determined to be (0.3541, 0.5427) and 72.8%, respectively. A high-quality warm-white LED has been fabricated through incorporating our CaY 2 HfGa(AlO 4 ) 3 :2%Ce 3+ green phosphors and commercial red phosphors with the 450 nm blue LED chip. When upon the 20 mA bias driving current, the LED device demonstrates a bright warm-white light emission, which possesses a satisfactory color rendering index of 91, a low correlated color temperature of 4080 K, as well as a good luminous efficacy of 85.14 lm W −1 . The creative greenemitting CaY 2 HfGa(AlO 4 ) 3 :Ce 3+ garnet phosphor has a bright application prospect toward high-quality warm-white LED lighting.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.