研究目的
Investigating the synthesis and photoluminescence properties of Ln3+ (Ln3+=Sm3+/Eu3+) doped Na2NbAlO5 phosphors for potential applications in white light-emitting diodes.
研究成果
The Na2-xNbAlO5: xLn3+ (Ln3+= Sm3+/Eu3+) phosphors synthesized by solid-state reaction exhibit promising photoluminescence properties, good thermal stability, and potential for applications in white light-emitting diodes. The energy transfer mechanisms were identified as electric dipole-dipole and dipole-quadrupole interactions for Sm3+ and Eu3+, respectively.
研究不足
The study focuses on the photoluminescence properties and energy transfer mechanisms of Sm3+ and Eu3+ doped Na2NbAlO5 phosphors. The potential limitations include the need for further optimization of the doping concentration and the exploration of other rare earth ions for broader applications.
1：Experimental Design and Method Selection:
The phosphors were synthesized by high-temperature-solid state reaction using Na2CO3, Nb2O5, Sm2O3, and Eu2O3 as raw materials. The mixtures were ground and sintered at 1250℃ for 6h under air condition.
2：Sample Selection and Data Sources:
The samples were characterized by SEM, XRD, EDX, photoluminescence, decay and thermal stability profiles.
3：List of Experimental Equipment and Materials:
X-ray diffractometer with Cu-Kα irradiation, UV-Visible Spectrophotometer, FLS-980 spectrometer, Hitachi S-3400N SEM, Otsuka QE-2100 quantum efficiency measurement system.
4：Experimental Procedures and Operational Workflow:
The samples were examined by XRD for phase identification, SEM for morphology, EDX for elemental analysis, and photoluminescence for emission and excitation spectra.
5：Data Analysis Methods:
The decay curves were fitted through second-order exponential to calculate the decay time. The energy transfer mechanisms were analyzed based on the critical distance and multipolar interactions.
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