研究目的
To prepare Er3+/Yb3+ co-doped BaGd2ZnO5 microcrystalline powder, analyze its spectral characteristics using Judd-Ofelt theory, calculate intensity parameters, transition probabilities, branching ratios, and energy level lifetimes, and measure up-conversion luminescence under 980 nm excitation to determine the photon absorption process.
研究成果
Er3+/Yb3+ co-doped BaGd2ZnO5 microcrystalline powder was successfully prepared and characterized. The Judd-Ofelt analysis provided intensity parameters indicating high asymmetry and ionic nature, with good optical performance. Up-conversion luminescence at 533 nm, 553 nm, and 670 nm was confirmed to result from two-photon absorption processes, demonstrating the material's potential for low-threshold laser applications.
研究不足
The powder sample presents challenges in measuring optical refraction index and absorption spectra due to strong scattering effects. The method for determining refractive index relies on emission spectra and lifetime measurements of Eu3+ ions, which may introduce uncertainties. The optical path length in powder is approximated based on refractive index comparisons, potentially affecting accuracy.
1：Experimental Design and Method Selection:
The study uses high-temperature solid-phase method for sample preparation, Judd-Ofelt theory for spectral analysis, and diffuse reflection spectroscopy for absorption measurements. A novel method is employed to calculate J-O parameters for powder samples, addressing limitations in refractive index and scattering effects.
2：Sample Selection and Data Sources:
The sample is prepared from raw materials including BaCO3, ZnO, Gd2O3, Er2O3, and Yb2O3 in specific mole ratios. XRD analysis confirms the crystal structure, and emission spectra are used for refractive index determination.
3：List of Experimental Equipment and Materials:
Equipment includes a muffle furnace for calcination, agate mortar for grinding, ceramic crucibles, Hitachi DMAX-3A for XRD, Zolix Omi-λ300 monochromator and PMTH-S1-CR131 photomultiplier for up-conversion spectra, Avantes ASPHERES-50-LS-HAL-12V integrating sphere and AvaSpec-2018 fiber spectrometer for diffuse reflection spectra. Materials are spectroscopic and analytical reagents.
4：Experimental Procedures and Operational Workflow:
Raw materials are weighed, ground, mixed, calcined at 1300°C for 4 hours, cooled, and ground again. XRD, up-conversion spectra under 980 nm laser excitation, and diffuse reflection spectra are measured. Absorption spectra are derived from diffuse reflection data using specific formulas.
5：Data Analysis Methods:
Data analysis involves least square fitting for J-O parameters, calculation of transition probabilities, branching ratios, and lifetimes using Judd-Ofelt equations, and fitting of up-conversion intensity vs. laser current to determine photon absorption number.
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X-ray diffraction equipment
DMAX-3A
Hitachi
Measuring XRD pattern of the prepared sample to confirm crystal structure.
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Monochromator
Omi-λ300
Zolix
Used in collecting up-conversion spectrum under 980 nm excitation.
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Photomultiplier
PMTH-S1-CR131
Zolix
Detecting light for up-conversion spectrum measurements.
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Integrating sphere
ASPHERES-50-LS-HAL-12V
Avantes
Recording diffuse reflection spectrum.
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Fiber spectrometer
AvaSpec-2018
Avantes
Recording diffuse reflection spectrum.
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Diode laser
Exciting the sample at 980 nm for up-conversion measurements.
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Muffle furnace
Calcining the sample at high temperature (1300°C).
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Agate mortar
Grinding and mixing raw materials.
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Ceramic crucible
Holding the sample during calcination.
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