研究目的
Investigating the effect of Hf4+ doping on the structure and enhancement of upconversion luminescence in Yb:Tm:LiNbO3 crystals.
研究成果
Hf4+ doping enhances the upconversion luminescence of Yb:Tm:LiNbO3 crystals, with significant improvements in blue and red emissions. The study provides a new strategy for improving the properties of upconversion luminescence in these crystals.
研究不足
The study is limited to the effects of Hf4+ doping on Yb:Tm:LiNbO3 crystals and does not explore other dopants or host materials. The experimental conditions are specific to the Czochralski method and may not be directly applicable to other growth techniques.
1：Experimental Design and Method Selection:
The Czochralski method was used to grow Hf:Yb:Tm:LiNbO3 crystals with varying Hf4+ concentrations. X-ray diffraction and infrared transmission spectra were employed to investigate the dopant occupancy and defect structure. UV–VIS–NIR absorption spectra and upconversion luminescence under 980 nm excitation were measured.
2：Sample Selection and Data Sources:
Crystals were grown with Hf4+ concentrations of 2 mol%, 4 mol%, and 6 mol%. The raw materials were of 99.99% purity.
3：99% purity.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: SHMADZU XRD-6000 diffractometer, Nicolet-710 FT-IR spectrometer, Varian Cary 5000 spectrometer, 980 nm diode laser, Zolix-SBP300 grating spectrometer with CR131 photomultiplier tube.
4：Experimental Procedures and Operational Workflow:
Crystals were grown, polarized, cut, and polished. Measurements were taken at room temperature with specified parameters for each instrument.
5：Data Analysis Methods:
Lattice constants were calculated by the least square method. The intensity of upconversion luminescence was analyzed in relation to Hf4+ concentration.
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