Supersonic microwave co-assistance (SMC) efficient synthesis of red luminescent Eu3+ activated silver molybdates and their phase-dependent evolution processes?

CrystEngComm Pub Date: 2013-05-13 DOI: 10.1039/C3CE40553B

Abstract

The chemical effects of high intensity ultrasound and microwave irradiation on the preparation of europium(III) activated silver molybdates were investigated and characteristic red emission was successfully achieved at a very low temperature (70 °C) in 40 minutes. X-ray powder diffraction results proved that the crystal phase of silver molybdate was heavily related to the pH value. Scanning electron microscopic images revealed rod-like structures of Ag2Mo3O10·1.8H2O and Ag2Mo2O7 were obtained in the range of pH values between 2 and 5, while growing particles of Ag2MoO4 were formed at pH values of 7 and 8. Furthermore, it has been found that the encapsulation of europium(III) in monoclinic crystal structure (Ag2Mo2O7) resulted in enhanced luminescence intensities compared to other crystal phases.

Graphical abstract: Supersonic microwave co-assistance (SMC) efficient synthesis of red luminescent Eu3+ activated silver molybdates and their phase-dependent evolution processes
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