研究目的
To synthesize and enhance the luminescent intensity of novel red-emitting rare earth molybdate phosphors NaLa(MoO4)2:Eu3+ for potential applications in white LEDs.
研究成果
The NaLa(MoO4)2:Eu3+ phosphors were successfully synthesized with tetragonal Scheelite structure, exhibiting strong red emission at 616 nm under UV, NUV, and blue light excitation. Doping with Bi3+ (optimum concentration 0.02) and using NH4F flux (optimum dosage 5%) effectively enhanced luminescent intensity by up to 40%, making them suitable for white LED applications.
研究不足
The method may have limitations in scalability for industrial production, and the effects of higher doping concentrations or other fluxing agents were not explored. The reaction conditions are specific to the microwave and calcination setup used.
1：Experimental Design and Method Selection:
The phosphors were synthesized using a sol-gel method assisted by microwave to achieve homogeneous composition and uniform particle size, with calcination at 800°C.
2：Sample Selection and Data Sources:
Analytical reagents including (NH4)6Mo7O24·4H2O, HNO3, NaNO3, Eu2O3, La2O3, Bi(NO3)3, NH4F, citric acid, and aqueous ammonia were used as starting materials.
3：List of Experimental Equipment and Materials:
A WG700SL2011-KG microwave oven for heating, a drying oven at 90°C, a muffle furnace for calcination, a Nicolet 380 Fourier transform infrared spectrometer for FTIR, a Y2000 diffractometer for XRD, and an F-380 fluorescence spectrophotometer for PL measurements.
4：Experimental Procedures and Operational Workflow:
Dissolve Eu2O3 and La2O3 in HNO3, prepare solutions, mix with other reagents, adjust pH to 2-3, treat with ultrasonic wave, heat in microwave to form gel, dry at 90°C, grind precursor, calcine at 800°C for 3 hours.
5：Data Analysis Methods:
FTIR spectra analyzed for functional groups, XRD patterns compared with JCPDS card for phase identification, excitation and emission spectra recorded and analyzed for luminescent properties.
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