Pr3+ and Tb3+ coactivated Na5Gd(WO4)4 showing tunable luminescence with high thermostability via modulation of excitation and temperature

In this work, Pr 3+ and Tb 3+ coactivated Na 5 Gd(WO 4 ) 4 (NGW) phosphors have been synthesized by high-temperature solid-state reactions and the scheelite crystal structure was determined for the first time. A color-tunable emission in NGW: Pr 3+ , Tb 3+ phosphors can be realized by the modulation of excitation wavelengths, namely, the fluorescence intensity ratio of Pr 3+ to Tb 3+ in this material could be changed by different excitation. With increasing temperature, the luminescence of NGW: Pr 3+ , Tb 3+ phosphor decreases almost linearly with the CIE coordinate variation from (0.306, 0.392) to ((0.375, 0.465) and result in the color of the photoluminescence variation from the blue-green to yellow. These results demonstrated that the investigated phosphors are attractive for application in display lighting and optical temperature sensing.