研究目的
To characterize the luminescence and cathodoluminescence properties of MIPr(PO3)4 (MI=Na, Li, K) and PrP5O14 poly-crystals synthesized by the flux method, with the aim of assessing their suitability as hosts for lanthanide ions and their potential applications in lighting and scintillator technologies.
研究成果
The MIPr(PO3)4 (MI=Na, Li, K) and PrP5O14 phosphates exhibit intense red–orange emissions and fast decay times, making them good candidates for displaying applications. Their intense 5d-4f electric-dipole parity-allowed emission in the UV upon electron excitation suggests potential use as scintillators. The structural differences between ultraphosphates and polyphosphates do not significantly affect the optical and scintillation properties of Pr3+ in these materials.
研究不足
The study is limited to the characterization of luminescence and cathodoluminescence properties at room temperature. The influence of structural differences and monovalent alkali ions on the optical properties was noted, but further studies are needed to fully understand these effects.
1：Experimental Design and Method Selection
The synthesis of MIPr(PO3)4 (MI=Na, Li, K) and PrP5O14 poly-crystals was carried out using the flux method. The spectroscopic properties were characterized under laser excitation at 488 nm and electron excitation.
2：Sample Selection and Data Sources
Samples were synthesized from a mixture of alkali metal ions carbonates and praseodymium oxide dissolved in phosphoric acid, with appropriate MI/Pr/P molar ratios.
3：List of Experimental Equipment and Materials
X’PERT Pro PANAnalytical diffractometer, Ar laser, Spectra Physics optical parametric oscillator (MOPO-730), Nd:YAG laser (Quanta-Ray CG-230), CCD camera (Hamamatsu PMA-11), Scanning Electron Microscope (Hitachi S-2500).
4：Experimental Procedures and Operational Workflow
The solution was thermally treated in a vitreous graphite crucicle at temperatures between 300-400°C for 5 to 7 days. The obtained crystals were washed in boiling water to remove excess phosphoric acid. XRD patterns, visible fluorescence spectra, decay times, and cathodoluminescence spectra were recorded.
5：Data Analysis Methods
The emission spectra and decay times were analyzed to characterize the luminescence properties. The cathodoluminescence spectra were used to assess the scintillation properties.
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