研究目的
To develop new red phosphors based on europium doped and substituted Barium Lanthanum Aluminate (BaLaAlO4: Eu3+) for potential applications in lighting and display devices, particularly for phosphor-converted LEDs (pcLEDs) to achieve high color purity.
研究成果
The BaLaAlO4:Eu3+ phosphor synthesized via modified solid-state reaction exhibits strong red emission at 626 nm with high color purity and moderate thermal stability. Substitution effects, particularly at La sites, enhance photoluminescence intensity. The phosphor shows potential as a red emitter for solid-state lighting applications, with recommendations for further development to optimize performance in practical devices.
研究不足
The phosphor synthesis requires high temperatures (up to 1000°C), and the morphology shows irregular shapes with agglomeration, which might affect coating applications. The study is limited to laboratory-scale synthesis and characterization; scalability and device integration were not addressed.
1：Experimental Design and Method Selection:
The phosphors were synthesized using a modified solid-state reaction technique involving an intermediate combustion process. The method was chosen for its simplicity and effectiveness in producing the desired crystal phase.
2：Sample Selection and Data Sources:
Stoichiometric ratios of precursors (Ba(NO3)2, La2O3, AlCl3·6H2O, CO(NH2)2, Eu2O3) were used. Samples were prepared with varying Eu3+ concentrations (1-8 mol%) and substitutions (Ba, La, Al sites).
3：List of Experimental Equipment and Materials:
Equipment included BRUKER XRD instrument model D2 PHASER, Spectrum One FTIR spectrophotometer, Carl Zeiss MA15/EVO 18 SEM, JOBIN YVON-Spex spectrofluorometer (Fluorolog version-3; model FL3-11), Hitachi 650-40 Fluorescence Spectrophotometer. Materials included precursor salts, water, nitric acid, KBr pellets.
4：Experimental Procedures and Operational Workflow:
Precursors were dissolved in water and nitric acid, fired at 600°C for 1 hour, milled, and annealed at 1000°C for 1 hour in air. Characterization involved XRD, FT-IR, SEM, PL excitation/emission, temperature-dependent PL, and lifetime measurements.
5：Data Analysis Methods:
Data were analyzed using standard techniques: XRD patterns compared with JCPDS files, FT-IR for bond vibrations, PL spectra for emission characteristics, CIE chromaticity for color coordinates, Judd-Ofelt theory for spectral parameters, and Arrhenius equation for thermal stability.
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