Up-Conversion Luminescence and Temperature Characteristics Study of Ho3+/Yb3+ Co-doped NaGd(MoO4)2 Phosphors

In order to obtain the maximum up-conversion luminescence intensity of Ho 3+ /Yb 3+ -doped NaGd(MoO4)2 phosphors, samples with 1.00%Ho 3+ /22.89%Yb 3+ doping concentration were prepared by high-temperature solid-phase method.The doping concentration of 1.00%Ho 3+ /22.89%Yb 3+ corresponds to the maximum luminescence intensity of red light excited by a 980 nm laser.X-ray diffraction analysis showed that the prepared samples were in pure NaGd(MoO4)2 phase.Under the excitation of a 980 nm laser, the measured and theoretical luminescence intensities of the optimal sample are close to each other.The relationship between different pumping currents and up-conversion luminescence intensity was tested.The red light of the sample was proved to be a two-photon process.Up-conversion luminescence mechanism of the sample was discussed in detail.Finally, we measured the emission spectrum of the optimal sample in the up-conversion to temperature.It was fitted using the fluorescence intensity ratio formula, and its relative sensitivity was calculated to be 0.0204 K -1 at 440 K. topics: NaGd(MoO4)2 phosphor, two-photon process, temperature characteristic, up-conversion luminescence