Photoluminescence properties of LuTaO4:RE3+ (RE3+ = Eu3+, Tb3+) with M '-type structure

Abstract Lu 0.96 Eu 0.04 TaO 4 and Lu 0.96 Tb 0.04 TaO 4 with M′-type have been successfully synthesized by solid reaction method. The photoluminescence properties of LuTaO 4 :Eu 3+ and LuTaO 4 :Tb 3+ were investigated individually under 394 nm and 378 nm excitation. The results indicate that the charge-transfer transition of O 2−  → Eu 3+ and the 4f 8  → 4f 7 5d 1 transition of Tb 3+ dominate the excitation spectra of LuTaO 4 :Eu 3+ and LuTaO 4 :Tb 3+ , respectively, and the low energy part of charge-transfer transition of TaO 4 3− also contributes to both excitation spectra. Eu 3+ and Tb 3+ doped in M′-type LuTaO 4 exhibit their characteristic emission. The dominated emission of Eu 3+ corresponding to the electric dipole transition 5 D 0  →  7 F 2 is located at 613 nm and bright green luminescence of LuTaO 4 :Tb 3+ attributed to the transition 5 D 4  →  7 F 5 is centered at 547 nm. The fluorescence lifetimes of Eu 3+ and Tb 3+ are determined as 1.51 ms and 1.04 ms, respectively.

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