研究目的
To prepare and characterize Dy3+-doped PbO-free alkali-heavy-metal-borate glasses for luminescent applications, including lasing and solid-state lighting.
研究成果
The Dy3+-doped zinc sodium bismuth borate glasses, particularly at 0.3 mol% doping, exhibit excellent luminescent properties suitable for yellow lasing and solid-state lighting applications, with good thermoluminescence characteristics for dosimetry up to 3 kGy gamma doses. The research highlights the potential of PbO-free glasses in optoelectronics.
研究不足
The study is limited to specific glass compositions and Dy3+ doping concentrations; potential optimizations include exploring other rare earth dopants or varying glass matrices. The hazardous nature of PbO was avoided by using Bi2O3, but other environmental or scalability factors were not addressed.
1：Experimental Design and Method Selection:
The study involved preparing Dy3+-doped zinc sodium bismuth borate glasses using the melt-quench technique, with characterization via XRD, FTIR, absorption spectra, photoluminescence, decay curves, and thermoluminescence after gamma irradiation. Theoretical models like Judd-Ofelt theory and Inokuti-Hirayama model were applied for analysis.
2：Sample Selection and Data Sources:
Glasses with molar compositions 10 ZnO-5Na2CO3-10Bi2O3-(75-x)B2O3-xDy2O3 (x = 0.1, 0.3, 0.5, 0.7, 1 mol%) were prepared, named ZNBBD-1 to ZNBBD-5. High-purity chemicals (99.9%) from Sigma-Aldrich were used.
3：1, 3, 5, 7, 1 mol%) were prepared, named ZNBBD-1 to ZNBBD-High-purity chemicals (9%) from Sigma-Aldrich were used. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a temperature control furnace, density kit (Contech), Abbe refractometer, Bruker copper K alpha X-ray diffractometer, Shimadzu 8400 S FTIR spectrometer, Perkin Elmer 750 S spectrophotometer, Edinburgh Instruments FLS 980 spectrofluorimeter, 60Co gamma irradiation source (Gamma Chamber 5000), and RISO TL/OSL DA-20 reader. Materials included ZnO, Na2CO3, Bi2O3, B2O3, Dy2O3, and emery sheets for polishing.
4：Experimental Procedures and Operational Workflow:
Chemicals were weighed, ground, melted at 1000°C for 2 hours, quenched on a preheated stainless steel mould, annealed at 350°C for 3 hours, polished, and characterized. Density and refractive index were measured; XRD, FTIR, absorption spectra, photoluminescence, decay curves, and thermoluminescence after gamma irradiation (doses 0.25-5 kGy) were recorded.
5：25-5 kGy) were recorded. Data Analysis Methods:
5. Data Analysis Methods: Data were analyzed using Judd-Ofelt theory for radiative parameters, exponential fitting for lifetimes, Inokuti-Hirayama model for quenching, CIE chromaticity for color coordinates, and Computerized Glow Curve Deconvolution (CGCD) for thermoluminescence kinetics.
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X-ray diffractometer
copper K alpha
Bruker
To record X-ray diffractograms to confirm amorphous nature of glasses.
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FTIR spectrometer
8400 S
Shimadzu
To obtain Fourier transform infrared spectra for structural analysis.
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Spectrophotometer
750 S
Perkin Elmer
To record absorption spectra from 250 to 2100 nm.
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Spectrofluorimeter
FLS 980
Edinburgh Instruments
To acquire photoluminescence and decay curves, using xenon lamp as excitation source.
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Gamma irradiation source
Gamma Chamber 5000
To irradiate samples with gamma rays for thermoluminescence studies.
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TL/OSL reader
DA-20
RISO
To measure thermoluminescence of irradiated glass samples.
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Density kit
Contech
To measure density of glass samples.
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Abbe refractometer
To measure refractive index of glass samples.
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