Structure, optical and photoluminescence properties of LiGd 1−x Er x (WO 4 ) 2 green luminescence phosphor

Abstract Double tungstate of lithium and trivalent gadolinium ions were prepared by mean of solid state reaction, and have been studied using X-ray diffraction, Raman scattering and photoluminescence analysis. The Er 3+ concentration effects on the structural and optical properties were studied. The compounds crystallize in the scheelite like structure with space group I 4 1 / a , and Z = 2. Spectroscopic and structural properties of the Er 3+ ions doping elements in LiGd(WO 4 ) 2 have been determined at room temperature. Steady and time resolved photoluminescence spectroscopies of the synthesized compounds are reported. Samples exhibit intense green emission of Er 3+ ( 4 S 3/2 → 4 I 15/2 and 2 H 11/2 → 4 I 15/2 transitions) under 377 nm excitation wavelength and present luminescent quenching around 3 at% Er 3+ concentration. The decay time decrease with increasing the Er 3+ concentration.