Preparation of Dy3+-Doped Calcium Magnesium Silicate phosphors by a new synthesis method and its Luminescence Characterization

Reference Presenter Authors
08-021 Vinicius Ribas de Morais Morais, V.R.(Instituto de Pesquisas Energéticas e Nucleares); Yamagata, C.(Instituto de Pesquisas Energéticas e Nucleares); Leme, D.d.(Instituto de Pesquisas Energéticas e Nucleares); In recent years, rare-earth doped alkaline earth silicates have been researched extensively as a new generation of phosphors with persistent luminescence. Compared with the conventional sulphide materials used for this purpose, silicates yield luminescence with longer duration time and higher bright, as well as improved chemical stability and lower cost. In the present work, phosphors based on calcium magnesium silicates (CaMgSi2O6, Ca2MgSi2O7), doped with Dy3+, were prepared by joining the methods sol-gel and co-precipitation. Silica gel was obtained from sodium silicate solution. Ca, Mg and Dy hydroxides, precipitated from respective aqueous chloride solutions with NaOH, were added to the obtained gel. After washing for removal of Cl- ions, the product was annealed at 900°C for 2 hours. XRD results confirmed the formation of diopside and akermanite phases. The latter phase (Ca2MgSi2O7) showed a higher luminescence quenching concentration of Dy3+ than the former phase (CaMgSi2O6).
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