研究目的
Investigating the red persistent luminescence properties and mechanism in (Sr,Ca)AlSiN3:Eu2+ phosphors, and comparing it with SrAl2O4:Eu2+,Dy3+ to propose a new mechanism.
研究成果
The study demonstrates strong red persistent luminescence in (Sr,Ca)AlSiN3:Eu2+ with optimal performance at 0.15% Eu2+ concentration, showing a persistent time of ~9600s. A new mechanism involving direct excitation to the conduction band is proposed, differing from SrAl2O4:Eu2+,Dy3+. This work aids in designing new persistent luminescence materials and deepens understanding of the mechanisms involved.
研究不足
The study is limited to specific compositions of (Sr,Ca)AlSiN3:Eu2+ and may not generalize to other phosphors. The mechanism proposed is based on comparisons and may require further validation. The persistent time and brightness could be optimized further, and co-doping with other ions might enhance properties.
1：Experimental Design and Method Selection:
The study used high-temperature solid-state reaction method to synthesize (Sr,Ca)AlSiN3:Eu2+ phosphors. Theoretical models for persistent luminescence mechanisms were employed, including thermoluminescence and photoluminescence spectroscopy.
2：Sample Selection and Data Sources:
Samples with varying Sr/Ca ratios and Eu2+ concentrations were synthesized. Data were collected from XRD, PLE, PL, diffuse reflection, persistent time, and thermoluminescence measurements.
3：List of Experimental Equipment and Materials:
Equipment includes Philips X'Pert PW-3040 XRD spectrometer, Edinburgh Instruments FLS920 fluorescence spectrometer, Hitachi UH4150 UV-Vis-NIR spectrophotometer, Hitachi F-4600 spectrophotometer, SENSINGM PR-305 phosphor photometer, Shanghai Guanghao ZF-20D dark-box UV analyzer, and Guangzhou Radiation Technology TOSL-3DS thermoluminescence spectrometer. Materials include Ca3N2, Sr3N2, EuN, AlN (E-grade, Tokuyama), Si3N4 (E-grade, UBE), and pure metals (
4：9%, Beijing Founde Star Science & Technology Co, Ltd.). Experimental Procedures and Operational Workflow:
Metal nitrides were prepared by firing metals under nitrogen, mixed with AlN and Si3N4 in a glovebox, ground, and fired at 1800°C for 6h under nitrogen atmosphere. Samples were characterized using XRD, PLE, PL, diffuse reflection, persistent time, and thermoluminescence measurements with specified parameters.
5：Data Analysis Methods:
Data were analyzed using Fullprof Suite software for XRD pattern calculation, and statistical analysis of spectral data and persistent time curves was performed.
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Fluorescence spectrometer
FLS920
Edinburgh Instruments
Recording photoluminescence excitation and emission spectra using a Xe lamp as excitation source.
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UV-Vis-NIR spectrophotometer
UH4150
Hitachi
Recording diffuse reflection spectra using BaSO4 as reference standard.
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Spectrophotometer
F-4600
Hitachi
Recording persistent luminescence spectra.
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X-ray diffraction spectrometer
X'Pert PW-3040
Philips
Recording X-ray diffraction patterns for structural characterization of phosphor samples.
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Phosphor photometer
PR-305
SENSINGM
Measuring persistent time of afterglow intensity.
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Dark-box UV analyzer
ZF-20D
Shanghai Guanghao Analytical Instruments Co. Ltd.
Providing dark environment and UV excitation for persistent luminescence measurements.
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Thermoluminescence spectrometer
TOSL-3DS
Guangzhou Radiation Technology Co. Ltd.
Recording three-dimensional thermoluminescence and thermoluminescence excitation spectra.
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AlN
E-grade
Tokuyama
Used as a raw material in the synthesis of phosphors.
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Si3N4
E-grade
UBE
Used as a raw material in the synthesis of phosphors.
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Pure metals
Beijing Founde Star Science & Technology Co, Ltd.
Used to prepare metal nitrides for phosphor synthesis.
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