Eu2+ and Ce3+ emission in sulphate based phosphors

Polycrystalline KMgSO4Cl:Eu and Na5(PO4)SO4:Ce phosphors prepared by a wet chemical method have been studied for its photoluminescence (PL) and thermoluminescence (TL) characteristics. The TL glow curve of the compound has a prominent peak at 200 °C and may be useful for TL study. TL sensitivity of the KMgSO4Cl:Eu phosphor is found to be 1.7 times less than that of TLD-CaSO4:Dy. The presence of bands at around 420, 435 and 445 nm in the PL emission spectra of the phosphor suggests the presence of Eu2+ in the host compound. Moreover a TL glow curve of the Na5(PO4)SO4:Ce gives a better understanding of the TL mechanism (peaks at 271 and 310 °C) involved in the concerned phosphor. The PL emission spectra are observed at 382 nm for the various concentrations. In this paper we report PL and TL characteristics of KMgSO4Cl:Eu halosulphate and Na5(PO4)SO4:Ce phosphate sulphate phosphors first time.