Preparation and temperature sensing behavior of NaY(MoO4)2: Pr3+, Tb3+ phosphors

Abstract

Adding sodium citric as chelator, NaY(MoO4)2: Pr3+, Tb3+ phosphors were prepared by hydrothermal method. XRD (X-ray diffraction) is employed to confirm the microscopic arrangement of the samples, and the test data show that phosphors are body – centered tetragonal structure. The FE-SEM (Field Emission Scanning Electron Microscope) results indicate that the addition of sodium citrate has a certain effect on the morphology of the samples. It was found from the measured temperature-dependent emission spectrum that Pr3+ and Tb3+ has different quenching trends, and temperature can be characterized by FIR (fluorescence intensity ratio) of Pr3+ ion and Tb3+ ion. Moreover, the experimental results display that with the rise of the molar ratio of Cit3−/Re3+, the sensitivity of phosphors gradually decreases, but the relative sensitivity gradually increases. The relative sensitivity of obtained samples has a higher value of 3.00% K−1 (Cit3−/Re3+ = 2). From the CIE chromaticity coordinates, it displays that the luminous color of phosphors changed continuously with the change of temperature.