研究目的
To study the effect of high pressure on the fluorescence lifetime for magnetic dipole 5D0→7F1 transition in YAG:Eu3+ crystal and to explain the observed changes with a comprehensive model.
研究成果
The fluorescence lifetime for the 5D0→7F1 transition in YAG:Eu3+ decreases with increasing pressure. A model considering the pressure effects on inter-ionic distance, ion volume, molecular volume, polarizabilities, and refractive indices successfully explains the observed changes, with good agreement between experimental and theoretical values.
研究不足
The study is limited to pressures up to 10.4 GPa and room temperature conditions. The model's accuracy depends on the assumptions about the constancy of the oscillator strength for the magnetic dipole transition and the effects of pressure on various parameters.
1：Experimental Design and Method Selection:
The study involved measuring the fluorescence lifetime of YAG:Eu3+ under high pressure using a diamond anvil cell (DAC) for pressure generation and a spectrofluorometer for measurements.
2：Sample Selection and Data Sources:
A small chip of YAG:Eu3+ was placed in a DAC with a methanol–ethanol mixture to ensure hydrostatic pressure conditions.
3：List of Experimental Equipment and Materials:
Equipment included an NBS type diamond anvil cell, a spectrofluorometer connected to a PC with a multiscaler card, and a mechanical chopper.
4：Experimental Procedures and Operational Workflow:
The fluorescence lifetime was measured at various pressures, with the pressure determined by the red shift of the 0–1 line.
5：Data Analysis Methods:
The decay curves were analyzed to determine the fluorescence lifetime, with standard deviations calculated for accuracy.
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