Abstract
In this paper, using calcium chloride and sodium molybdate as raw material, polyethylene glycol (PEG2000) as surfactant, the nanocomposites of CaMoO4: Eu3+ were prepared by a direct feeding microwave synthesis method. The as-prepared sample was characterized by X-ray diffraction (XRD), scanning electron micrograph (SEM) and photoluminescence spectrum (PL). The XRD Pattern showed that the samples are scheelite structure of CaMoO4. The SEM image showed that the majority of as-prepared sample is a relatively flake structure, and some fine particles attached to it. PL spectra showed that as-prepared samples have strong luminescence properties; it had purity red emission at 615 nm. The effects of different Eu3+ ions doping amount and surface active agent on the photoluminescence properties were studied. The results showed that when the molar ratio of Eu3+ was 0.10, PEG2000 as surfactant, the luminescence intensity of as-prepared sample was maximum.
Highlights
Molybdate has superior optical, electrical, magnetic properties, in terms of scintillator, light soldering, sensors and catalysts has a wide application prospect
We report on a direct feeding microwave synthesis method to synthesize CaMoO4:Eu3+ red phosphors
At a molar ratio of Ca:Mo:Eu of 1:1:0.1, 1.1 g of CaCl2 was dissolved in 50 ml of 2% PEG aqueous solution, dispersed and dissolved with ultrasonic waves, add 1 mmol of Eu3+ reserve liquid, mixed uniform for A solution. 2.42 g of Na2MoO4·2H2O was dissolved in 50 mL of 2% PEG aqueous solution, the dispersion was dissolved by ultrasonic mixing, for B solution
Summary
Electrical, magnetic properties, in terms of scintillator, light soldering, sensors and catalysts has a wide application prospect. Molybdate system because of it’s in the near UV region has wide and strong charge transfer absorption band. Li et al 100 ions prepared in near ultraviolet excitation efficient red phosphor, used for white light emitting diode to arouse people’s great interest [1]-[11]. Several techniques were used to synthesize CaMoO4:Eu3+ red phosphors, such as high temperature solid-state, hydrothermal, sol-gel, chemical co-precipitation, combustion, microwave radiation method and so on. We report on a direct feeding microwave synthesis method to synthesize CaMoO4:Eu3+ red phosphors. Nanocomposites of CaMoO4:Eu3+ were prepared by a direct feeding microwave synthesis method. 2.42 g of Na2MoO4·2H2O was dissolved in 50 mL of 2% PEG aqueous solution, the dispersion was dissolved by ultrasonic mixing, for B solution. The precipitate was centrifuged, washed with the deionized water for several times and dried at 60 ̊C in the vacuum for 8 h, The final product was collected for the characterization
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