Optimization of luminescence properties of Tb^(3+)-doped a-Sr_2P_2O_7 phosphor synthesized by combustion method

摘要

In this paper, thermoluminescence(TL)properties of rare earth Tb^(3+)-doped α-Sr_2 P_2 O_7 were examined after β-irradiation and photoluminescence(PL)properties of samples were examined for proper excitation.All the samples were synthesized by high-temperature combustion method. The X-ray diffraction(XRD)and Fourier transform infrared(FTIR) spectroscopy characterization confirms the formation of pure α-phase with crystallized in orthorhombic structure of samples.The PL emission spectra of all samples exhibit characteristic green emission peaks of Tb^(3+) where the peak at545 nm has the highest emission intensity for Tb^(3+) concentration of 5.0 mol%. The TL glow curves of β-irradiated Tb^(3+)-doped α-Sr_2 P_2 O_7 phosphors were recorded at different heating rates of 2, 4, and 6 K·s^(-1). TL curves of all sample exhibit combination of two peaks: peak at420 K shifts toward higher temperature, while peak at525 K remains unaffected with the increase in Tb^(3+)concentration as well as fading effect. The activation energy and kinetic parameters of the samples were evaluated using thermoluminescence peak shape method.