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

In this article, we prepared europium ions (Eu 3+ ) 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(WO 4 ) 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 Eu 3+ -doped LiLu(WO4)2. The emission spectra show the intra-configurational red emission characteristic of Eu 3+ ions, namely 5 D 0 → 7 F j , J = 0–4. The quenching emission by temperature as well as the 5 D 0 emission decay curves were measured and discussed. It was found that the quenching of luminescence is obtained for 1.5 at% Eu 3+ concentration. Judd–Ofelt intensity parameters (Ω 2 = 5.26 × 10 −20 cm 2 and Ω 4 = 1.04 × 10 −20 cm 2 ) and the ‘Commission Internationale de l’Eclairage’ (CIE) chromaticity coordinates were calculated from the emission spectrum of LiLu 1− x Eu x (WO 4 ) 2 for x = 0.015. The results indicate that Eu 3+ -doped LiLu(WO 4 ) 2 could be a suitable material for solid-state lighting applications.