研究目的
To develop Mn4+ doped oxide phosphors with high luminescence efficiency and thermal stability for indoor plant cultivation applications by incorporating Mn4+-Mg2+ pairs into a CaGdAlO4 host to reduce non-radiative channels.
研究成果
Mn4+/Mg2+ co-doped CaGdAlO4 phosphors exhibit enhanced red emission, quantum efficiency, and thermal stability due to reduced non-radiative channels. The optimal doping concentration is 0.5 mol%, and the phosphor is suitable for LED applications in plant cultivation, with demonstrated deep red emission and good color stability.
研究不足
The thermal quenching behavior is attributed to the relatively small band gap of the CaGdAlO4 host and strong electron-phonon coupling, limiting high-temperature performance. The synthesis requires high temperatures (1450°C), and the doping concentration is limited to avoid concentration quenching.
1：Experimental Design and Method Selection:
The study uses a conventional solid-state reaction approach to synthesize Mn4+/Mg2+ co-doped CaGdAlO4 phosphors. Theoretical models include density functional theory (DFT) for electronic structure calculations and Dexter theory for multipolar interactions in concentration quenching analysis.
2：Sample Selection and Data Sources:
Samples are prepared with varying doping concentrations (x = 0 to
3：02 mol%) of Mn4+ and Mn4+/Mg2+ in CaGdAlO4 host. Raw materials are analytical purity chemicals purchased from Guangzhou Reagent Co. Ltd. List of Experimental Equipment and Materials:
Equipment includes a Bruker D8 Advance X-ray powder diffractometer, Horiba Fluorolog-3 spectrometer, TAP-02 high-temperature heating instrument, and CASTEP software for DFT calculations. Materials include CaCO3, Gd2O3, Al2O3, MnCO3, MgO, BaSO4 for quantum efficiency measurements, and components for LED fabrication (glue A, curing agent B, 365 nm InGaN chip).
4：Experimental Procedures and Operational Workflow:
Raw materials are weighed, mixed, ground, pre-calcined at 500°C for 3h, sintered at 1450°C for 5h, and cooled. Characterization involves XRD, photoluminescence spectra, decay time, thermal quenching, quantum efficiency measurements, and LED device fabrication.
5：Data Analysis Methods:
Data analysis includes Rietveld refinement for crystal structure, Gaussian fitting for excitation spectra, double-exponential fitting for decay curves, and equations for critical distance, quantum efficiency, crystal field parameters, and activation energy.
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