CaMgSi2O6:Eu2+ and Dy3+ co doped phosphors prepared by combining two chemical method

Abstract

Silicate system of the CaO–MgO–SiO2 has attracted great interest due to its high weather resistance which is endorsed by the physical and chemical stability [1, 2]. This property makes it applicable as host for luminescent materials. CaMgSi2O6 (diopside), an important component of the mantle and subduction slabs has been studied by many researchers [3]. Eu2+ activated alkaline earth silicate phosphors have a long afterglow characteristic and blue to green emission by the near ultraviolet [4] stimulation. Glass ceramic of CaO–MgO–SiO2 system has potential application on the optical devices [5, 6], for example, Ca2MgSi2O7:Eu2+ [7] and CaMgSi2O6:Eu2+, Dy3+ [8]. Ca2MgSi2O7: Eu2+ is a promising phosphor material for white light emitting diode (LED) [5]. In this study, CaMgSi2O6:Eu2+ and Dy3+co-doped CaMgSi2O6:Eu2+ phosphors were synthesized using sol gel technique followed by a modified molten salt method and thermal treatment in a weak reducing atmosphere. Crystalline phase identification by XRD and the measurements of photoluminescence (PL) excitation were performed. The XRD results reveal that the synthesized phosphors are crystalline and assigned to the diopside structure. The PL results indicate the emission spectra of CaMgSi2O6:Eu2+ and Dy3+ co-doped CaMgSi2O6:Eu2+ phosphors have a broad band at 450nm attributed to electronic transition from the 4f6 5d1 state to the 4f7 state.