Valency and solubility limit of Cu ions in cubic and hexagonal phases of ZnS:Cu:Mn:Dy(Cl) phosphors |
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Authors: | P R Bote P K Patil J K Nandagave R D Lawangar-Pawar |
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Institution: | (1) Solid State Physics Research Laboratory, Department of Physics, Shaivji University, 416 004 Kolhapur, India |
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Abstract: | Polycrystalline ZnS:Cu:Mn:Dy (Cl) phosphors with varying concentration of Cu and fixed concentrations of Mn and Dy have been prepared, XRD studies showed that the cubic — hexagonal phase transformation in the phosphors is a sensitive function of Cu concentration so that cubic phase dominates at higher Cu concentrations. It has also been found that Cu enters into the cubic ZnS phase as Cu+ while in hexagonal ZnS phase as Cu2+ and their solubility limits are around 0.1 wt.% and 0.25 wt.% respectively. Attempt has been made to confirm the existence of Cu+ in cubic phase and Cu2+ in hexagonal phase from EL emission spectra of the phosphors. |
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