研究目的
To prepare Pr3+ doped CaTiO3 red emitting phosphor with enhanced photoluminescence and ultrahigh temperature sensitivity using NaF flux assisted solid-state reaction, and to investigate its structural, optical, and thermometric properties.
研究成果
The NaF flux assisted synthesis successfully enhanced the PL intensity and temperature sensitivity of Pr3+ doped CaTiO3 phosphor. The material exhibits high color purity, long afterglow, and ultrahigh temperature sensitivity, making it a promising candidate for optical temperature sensors and red-emitting applications. The IVCT state plays a crucial role in the emission and thermal response mechanisms.
研究不足
The study is limited to specific Pr3+ and NaF concentrations; excess NaF quenches PL intensity. The temperature sensing range is 298-523 K, and the sensitivity might be affected by material defects and synthesis conditions. Further optimization for practical applications in harsh environments is needed.
1：Experimental Design and Method Selection:
The phosphors were synthesized via conventional solid-state reaction method with NaF flux assistance. The doping amounts of Pr3+ and NaF were optimized. Characterization included XRD, FE-SEM, UV-vis DR, PLE, PL, afterglow decay, TL, and temperature-dependent PL measurements.
2：Sample Selection and Data Sources:
Samples were CaTiO3: xPr3+ (x=0%,
3：45%, 6%, 75%, 9%) and CaTiO
4：6%Pr3+ + yNaF (y=0%, 0%, 5%, 0%, 5%, 0%, 5%). Raw materials included TiO2, CaCO3, NaF, C2H5OH, and Pr2(C2O4)3·10H2O. List of Experimental Equipment and Materials:
X-ray diffractometer (PANalytical X’Pert PRO), FE-SEM (Hitachi-SU8010), UV-vis spectrophotometer (Shimadzu UV-2700), fluorescence spectrophotometer (Hitachi F-7000 and F-4500), luminescence meter system (Beijing Nuclear Instrument Factory), temperature-controlled oven (TAP-02).
5：2). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Raw materials were mixed, ground, dried, and calcined at 1300°C for 2h. XRD patterns were obtained with Cu Kα radiation. Morphologies were observed by FE-SEM. UV-vis DR, PLE, PL spectra were recorded. Afterglow and TL were measured after UV irradiation. Temperature-dependent PL spectra were recorded from 298 to 523 K.
6：2h. XRD patterns were obtained with Cu Kα radiation. Morphologies were observed by FE-SEM. UV-vis DR, PLE, PL spectra were recorded. Afterglow and TL were measured after UV irradiation. Temperature-dependent PL spectra were recorded from 298 to 523 K. Data Analysis Methods:
5. Data Analysis Methods: XRD data analyzed with GSAS software for Rietveld refinement. Particle size estimated from SEM images. Bandgap calculated using Kubelka-Munk and Tauc's functions. ET mechanism analyzed using critical distance and multipolar interaction models. Trap depth calculated from TL data. Temperature sensitivity parameters Sa and Sr derived from FIR values.
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