Characterization of YVO4:Eu3+ phosphors synthesized by microwave heating method
2005; Elsevier BV; Volume: 408-412; Linguagem: Inglês
10.1016/j.jallcom.2005.01.081
ISSN1873-4669
AutoresKazuyoshi Uematsu, A. Ochiai, Kenji Toda, Mineo Sato,
Tópico(s)Microwave-Assisted Synthesis and Applications
ResumoYVO4:Eu3+ phosphors were prepared using a domestic microwave oven operated at 2.45 GHz with 500 W. The temperature of raw materials with mixtures of Y2O3, V2O5 and Eu2O3 that were irradiated with the microwave increased to about 840 °C within 150 s. Subsequently, the temperature dropped sharply in spite of the continuing microwave irradiation. Measurement of the dielectric loss factor of the raw materials and products at 2.45 GHz at temperatures from 25 °C to 800 °C revealed a high absorption efficiency of microwave energy by V2O5, which provided a rapid increase in the raw material's temperature. A low dielectric loss factor observed for YVO4:Eu engendered a sharp temperature drop after completion of the reaction of Y2O3 with V2O5.
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