An intense green-emitting phosphor Na 2Gd 2B 2O 7:Ce 3+, Tb 3+ is developed on the basis of the highly efficient energy transfer from Ce 3+ to Tb 3+. The photoluminescence emission and excitation spectra, the lifetime, and the effect of Tb 3+ concentration are investigated in detail. Results confirm the occurrence of non-radiative energy transfer from Ce 3+ to Tb 3+ with an efficiency of over 80%. The intensity ratio of blue emission from Ce 3+ and green emission from Tb 3+can be tuned by adjusting their concentrations. The enhanced photoluminescence of Tb 3+ with sharp emission lines could be obtained by the broad band excitation peak at about 360 nm from the allowed 4f-5d absorption of Ce 3+ ions. The results suggest that the phosphor Na 2Gd 2B 2O 7:0.05Ce 3+, 0.12Tb 3+ with the optimal composition could potentially be used for near ultraviolet light-emitting diodes (n-UV LEDs).