研究目的
Investigating the upconversion luminescence and optical temperature sensing properties of Yb3+/Er3+/Li+ tri-doped ZnMoO4 phosphors, including the effects of Li+ doping on luminescence enhancement and the establishment of a reliable temperature scale by mitigating thermal effects.
研究成果
Li+ doping in Yb3+/Er3+ tri-doped ZnMoO4 phosphors enhances green upconversion luminescence and improves color purity. A reliable temperature scale for optical thermometry was established by reducing pumping power to minimize thermal effects, showing good temperature sensitivity comparable to other materials, making it a promising candidate for temperature sensing applications.
研究不足
The synthesis resulted in samples with impurity phases, and it was difficult to obtain pure ZnMoO4 doped with trivalent rare earth ions. The thermal effect from laser radiation could not be completely eliminated due to low upconversion efficiency, though it was mitigated by reducing pump power and using a copper sample cell with good thermal conductivity.
1：Experimental Design and Method Selection:
A modified solid-state method was used to synthesize ZnMoO4:8%Yb3+/1%Er3+/x%Li+ phosphors, with rare earth ions introduced in solution form. The rationale was to enhance upconversion luminescence and study temperature sensing properties.
2：Sample Selection and Data Sources:
Samples with Li+ concentrations of 0%, 5%, 10%, 20%, 30%, and 40% were prepared. Raw materials included ammonium molybdate tetrahydrate, zinc oxide, lithium carbonate, Yb(NO3)3·6H2O, and Er(NO3)3·6H2O, purchased from specified suppliers.
3：List of Experimental Equipment and Materials:
Equipment included a Smartlab 9 X-ray diffractometer for XRD, Inspect F50 FE-SEM for morphology, EDAX octane super SEM energy dispersive spectrometer for elemental analysis, Hitachi F-4600 fluorescence spectrophotometer for upconversion spectra, FLS980 phosphorescence lifetime spectrometer for decay curves, and a home-made sample temperature control setup with a PID controller and k-type thermocouple for temperature-dependent measurements.
4：Experimental Procedures and Operational Workflow:
Raw materials were mixed, dissolved, evaporated, ground, and calcined at 800°C for 4 hours. Characterization involved XRD, SEM, EDS, upconversion spectra measurement under 980 nm excitation, decay curve measurement, and temperature-dependent luminescence studies with controlled pumping powers.
5：Data Analysis Methods:
XRD patterns were compared to PDF standards. Upconversion spectra were analyzed for intensity ratios. Decay curves were fitted using average lifetime calculations. Temperature sensitivity was evaluated using Boltzmann distribution law and linear fitting of Ln(IH/IS) vs. 1/T.
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