The Calcium Silicate Mn + Pb Phosphor Phase Relationships and Preparation

Abstract

Phase relations were examined in the vicinity of CaSiO~ in the system to pseudowollastonite inversion temperature. Addition of MnSiO, to (Ca,Pb) CaSiO~-MnSiO~-PbSiO,. Lead solid solutions in CaSiO, lower the wollastonite SiO, ss markedly lowers the solubility of lead in (Ca,Mn,Pb)SiO~ss and causes a change in structure from pseudowollastonite to wollastonite. Application of the phase data is used to demonstrate how the synthesis technique can be varied to produce major differences in particle size of the phosphor.

Luminescence properties of CdSiO3:Mn2+ phosphor

“…According to the XRD phase analyzed and the charge balance rule, the Mn 2+ ions occupied in the Cd 2+ sites of the CdSiO 3 host and not any Mn 2+ ion is expected to occupy the Si 4+ sites. It can be referred that the phase structure of CdSiO 3 is similar to that of the CaSiO 3 , which has been reported early in 1950s [16], because the configuration of both Ca and Cd have the very similar outermost shells, 4s 2 for calcium and 4d 10 5s 2 for cadmium. And their ionic radii are very close in size, 0.099 and 0.097 nm for calcium and cadmium, respectively.…”

Enhancement of luminescence intensity and increase of emission lifetime in Eu3+-doped 3CdO–Al2O3–3SiO2 amorphous system

“…All of these advantages have led to the method to make materials with specific optical and electrical properties [3]. The amorphous sol-gel glasses have been reported as promising host materials for highly doped with transition metal ions and rare-earth ions [4,5]. Many trivalent rare-earth ions such as Eu 3+ , Tm 3+ , Er 3+ and Pr 3+ were used to dope as absorption and emission centers in these materials [6,7].…”

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“…14 Metal silicates have been widely reported as promising host materials for rare earth and transition metal ions with excellent luminescence properties in the blue, green and red spectral regions. 15 Mn 2z -activated zinc orthosilicate (Zn 2 SiO 4 ) has been used as a green component in cathode ray tubes and electroluminescent devices because of its high luminescence efficiency and chemical stability. 1,16 Eu 3z -activated CaSiO 3 and MgSiO 3 gels and crystalline samples have been prepared by the sol-gel process and the effect of the sintering temperature on the luminescence properties of Eu 3z studied.…”