Abstract
Abstract Rod-like Lu2O3:Eu3+ nanoparticles were successfully prepared by solvothermal method and subsequent calcination. Thermogravimetric (TG), X-ray diffraction (XRD) Fourier transform infra-red spectroscopy (FT-IR), scanning electron microscopy (SEM) and photoluminescence (PL) spectrum were utilized to characterize the samples. According to the results of XRD and SEM, 600 °C is the optimum calcination temperature. PL spectra show that concentration quenching occurs when the concentration of Eu3+ in Lu2O3 reaches 4%. The symmetry of the local environment of Eu3+ activators in Lu2O3 has been described in the frame of Judd-Ofelt (J-O) theory. Then the luminescence properties of Lu2O3:Eu3+ and Lu2O2S:Eu3+ phosphors were compared. By comparison, it was found that the synthesized Lu2O3:Eu3+ phosphors had higher luminescence intensity and longer fluorescence time than Lu2O2S:Eu3+ phosphors at their respective optimal Eu3+ doping concentrations. The reasons for the luminescence differences were attributed to the lower band-gap energy of the matrix and the lower symmetry around Eu3+.
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