研究目的
To develop a high-sensitive optical temperature sensing strategy based on the temperature-induced red-shift of the V-O charge transfer band edge and thermal population of the 5D1 state of Eu3+ ions in YVO4:10% Eu3+.
研究成果
The research successfully demonstrated a high-sensitive optical temperature sensing strategy by leveraging the temperature-induced red-shift of the V-O CTB edge and thermal population of the 5D1 state in Eu3+ ions. A high relative sensitivity of 3923/T2 was achieved, with excellent reversibility and stability in temperature cycling tests, indicating strong potential for developing advanced optical thermometers.
研究不足
The study is limited to a specific temperature range (300-480 K) and material system (YVO4:Eu3+). Potential limitations include the need for excitation at a fixed wavelength (358 nm) and the absence of in vivo or real-world application testing. Optimization could involve extending the temperature range or exploring other host materials.
1：Experimental Design and Method Selection:
The study utilized a high temperature solid-state route to prepare YVO4:10% Eu3+ powder samples. The methodology involved analyzing temperature-dependent excitation and emission spectra to investigate the effects of CTB red-shift and thermal population on luminescence properties for temperature sensing.
2：Sample Selection and Data Sources:
The sample was YVO4 doped with 10% Eu3+ ions, prepared using a solid-state synthesis method. Data were collected from fluorescence spectra and decay curves measured at various temperatures.
3：List of Experimental Equipment and Materials:
Equipment included a powder X-ray diffractometer (X?Pert3), a HORIBA fluorescence spectrometer (Florolog-3-21) with a 450 W xenon lamp and a pulsed HORIBA S-370 SpectraLED (peak wavelength 369 nm, FWHM 15 nm), a heating setup with a copper plate and heating tube, and a temperature controller (OMRON E5CC-800) with a type-K thermocouple. Materials included YVO4:10% Eu3+ powder.
4：Experimental Procedures and Operational Workflow:
The sample was pressed into a copper plate groove and heated from 300 to 480 K. Excitation and emission spectra were recorded using the fluorescence spectrometer under 358 nm excitation. Decay curves were measured to assess temperature quenching. Temperature cycling tests were conducted to evaluate reversibility.
5：Data Analysis Methods:
Data were analyzed using Arrhenius equation fittings to determine temperature dependences and calculate relative sensitivities. Spectral intensities and ratios were quantified to derive sensitivity parameters.
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