Preparation and characterization of SrS : Eu2+0.02, Dy3+0.01/polyvinyl butyral composites

Abstract

The SrS:Eu0.022+, Dy0.013+ phosphors modified with stearic acid (SA) were compounded with the polyvinyl butyral (PVB) matrix to improve its chemical stability and luminescence properties. The structure and luminescence properties of modified and unmodified SrS:Eu0.022+, Dy0.013+ and SrS:Eu0.022+, Dy0.013+/PVB composites were studied. The results of x-ray diffraction showed that the crystalline of the modified SrS:Eu0.022+, Dy0.013+ phosphors (SrS:Eu0.022+, Dy0.013+-SA) has almost no change compared with SrS:Eu0.022+, Dy0.013+ phosphors. The infrared spectra indicated that the SA molecules were anchored onto the surface of the phosphors and ─Sr─O─CO─ bonds were formed. Microstructure of the samples was characterized by scanning electron microscopy. The investigation of fluorescence spectra reflected that the emission peak position of SrS:Eu0.022+, Dy0.013+/PVB composites appeared at 611 nm with no migration, whereas the luminescence intensity increased. The results of water-resistant tests proved that SrS:Eu0.022+, Dy0.013+/PVB materials had better chemical stability than SrS:Eu0.022+, Dy0.013+ phosphors.