Photoluminescence spectroscopy of Eu3+-doped LiLu(WO4)2 powder material prepared by solid-state reaction

In this article, we prepared europium ions (Eu3+) doped lithium lutetium double tungstate material using a classical solid-state reaction. X-ray diffraction (XRD), optical absorption and photoluminescence techniques were used to characterize the samples. XRD analysis and structural refinement measurements revealed that LiLu(WO4)(2) has a monoclinic structure with a P2/n space group with a formula unit (Z = 2). Additionally, we measured, analysed, and discussed the room-temperature photoluminescence emission and excitation spectra of Eu3+-doped LiLu(WO4)2. The emission spectra show the intra-configurational red emission characteristic of Eu3+ ions, namely D-5(0) -> F-7(j), J = 0-4. The quenching emission by temperature as well as the D-5(0) emission decay curves were measured and discussed. It was found that the quenching of luminescence is obtained for 1.5 at% Eu3+ concentration. Judd-Ofelt intensity parameters (Omega(2) = 5.26 x 10(-20) cm(2) and Omega(4) = 1.04 x 10(-20) cm(2)) and the 'Commission Internationale de l'Eclairage' (CIE) chromaticity coordinates were calculated from the emission spectrum of LiLu1-xEux(WO4)(2) for x = 0.015. The results indicate that Eu3+-doped LiLu(WO4)(2) could be a suitable material for solid-state lighting applications.