研究目的
Designing high-performance optical thermometer based on new thermally coupled levels (New-TCLs) in Bi3+-Tb3+-Eu3+ co-doped garnet type Ca3Sc2Si3O12 phosphor for high temperature environment.
研究成果
The New-TCLs technology in CSSO phosphors exhibits excellent temperature sensing features in a wide temperature range with high absolute and relative sensitivities, and good signal discrimination. This strategy offers a novel method for designing high-performance optical thermometers.
研究不足
The study focuses on the specific system of Bi3+-Tb3+-Eu3+ co-doped CSSO phosphors, and the applicability of the New-TCLs strategy to other phosphor systems is not explored. The temperature range is limited to 303 K–500 K.
1：Experimental Design and Method Selection:
The study involves constructing new thermally coupled levels (New-TCLs) based on different luminescent centers (Bi3+/Eu3+, Tb3+/Eu3+) in Ca3Sc2Si3O12 (CSSO) phosphors. The methodology includes steady-state rate equations to confirm the thermalization process among New-TCLs.
2：Sample Selection and Data Sources:
Samples are Bi3+, Tb3+, and Eu3+ singly- or co-doped CSSO phosphors. Data sources include photoluminescence excitation (PLE) and photoluminescence (PL) spectra, temperature-dependent emission intensities, and decay curves.
3：List of Experimental Equipment and Materials:
X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared (FT-IR) spectra, and luminescent mapping are used. Materials include CSSO phosphors doped with Bi3+, Tb3+, and Eu3+.
4：3+.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The procedure involves doping CSSO phosphors with Bi3+, Tb3+, and Eu3+, measuring PLE and PL spectra, analyzing temperature-dependent PL intensities, and fitting the fluorescence intensity ratio (FIR) versus temperature by Boltzmann distribution law.
5：Data Analysis Methods:
The analysis includes fitting the FIR values to Boltzmann distribution law, calculating absolute and relative temperature sensitivities, and establishing steady-state rate equations to understand the population distribution of New-TCLs.
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