研究目的
Investigating the enhancement of middle infrared fluorescence and upconversion of Er3+-doped transparent germanate glasses containing LaF3 nanocrystals.
研究成果
The study successfully demonstrated significant enhancement of NIR, MIR, and upconversion fluorescence in Er3+-doped oxyfluoride germanate glasses containing LaF3 nanocrystals through controlled heat treatment. The incorporation of Er3+ ions into LaF3 nanocrystals was quantitatively estimated, showing potential for applications in optical communication and fiber lasers.
研究不足
The study is limited by the technical constraints of heat treatment temperatures and durations, and the potential for further optimization in the incorporation of Er3+ ions into LaF3 nanocrystals.
1：Experimental Design and Method Selection:
The oxygerminate glasses were prepared by the conventional melt-quenching method with the composition of 20PbF2-71GeO2-5Al2O3-4La2O3-2ErF3 in mol%. The samples were heat treated at various temperatures and durations to precipitate LaF3 nanocrystals.
2：Sample Selection and Data Sources:
Analytical regent Al(OH)3, anhydrous powders of GeO2, ErF3 with 5N purity and PbF2, La2O3 with 4N purity were used as starting materials.
3：List of Experimental Equipment and Materials:
Different scanning calorimetry (DSC) curve was used to measure the thermal parameter. Bruker D8 polycrystalline X-ray diffraction (XRD) analysis was performed to analyze the crystalline phase and structure. Absorption spectra was measured by using Lambda 900/UV/VIS/NIR spectrophotometer. Static and dynamic upconversion, NIR and MIR fluorescence spectra were measured by an Edinburgh FLS920 Fluorospectrophotometer with a semiconductor laser diode operating at 980 nm.
4：Experimental Procedures and Operational Workflow:
The samples were melted at 1300oC for 40 min, cast into a stainless steel plate, annealed, cut into slices, and polished for heat treatment and optical measurements.
5：Data Analysis Methods:
The multi-phonon relaxation rate was expressed by a given equation to analyze the fluorescence intensity enhancement.
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