Luminescent Properties and Energy Transfer of Green-Emitting Ca[sub 3]Y[sub 2](Si[sub 3]O[sub 9])[sub 2]:Ce[sup 3+],Tb[sup 3+] Phosphor

Green-emitting phosphors of have been synthesized by solid-state reaction. The luminescence properties were characterized by photoluminescence (PL) and photoluminescence excitation spectra, reflection spectra, and a detection system using an integrating sphere equipped with a spectrofluorometer. With co-doping as a sensitizer, the PL intensity of was found to increase dramatically by a factor of 5.8. For comparison, the emission intensity of composition-optimized is 126% of green commodity, ZnS:Cu,Al. The quantum efficiency of is as high as 77% compared to ZnS:Cu,Al (53%). The energy transfer from to is also of resonant type via a dipole–dipole mechanism with the energy-transfer critical distance of 6.78 Å. By utilizing the principle of energy transfer and appropriate tuning of activator contents, we are currently evaluating the potential application of as a highly efficient UV-convertible phosphor.