EU2+ and Ce3+ emission in sulphate based phosphors

摘要

Polyerystalline KMgSO4Cl:Eu and Na-5(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 degrees 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 urn in the PL emission spectra of the phosphor suggests the presence of Eu2+ in the host compound. Moreover a TL glow curve of the Na-5(PO4)SO4:Ce gives a better understanding of the TL mechanism (peaks at 271 and 310 degrees 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 Na-5(PO4)SO4:Ce phosphate sulphate phosphors first time. (C) 2007 Elsevier B.V. All rights reserved.