A Green-Emitting Phosphor Sr[sub 3]La(PO[sub 4])[sub 3]:Ce[sup 3+],Tb[sup 3+] with Efficient Energy Transfer for Fluorescent Lamp

Green-emitting phosphors of have been synthesized by a solid-state reaction. The energy transfer from to is a resonant type via a dipole–dipole mechanism with an energy-transfer critical distance of 7.6 Å. By utilizing the principle of energy transfer and appropriate tuning of activator contents, we have also made an attempt to observe a strong green emission performance displayed by this phosphor for use as a coating material on compact fluorescent lamps (CFLs). The results clearly indicate that the luminous efficiency based on was found to be 69 lm/W. The good luminous efficiency and lumen maintenance (2000 h, 91.8%) of the green-emitting CFL demonstrate that this phosphor can be suitable for application on a short UV fluorescent lamp. Additionally, the green phosphor has advantages of environmental friendliness and low cost.