Low Temperature Preparation of Ca_0.5Sr_0.5S⋅0.001CeS₂ Phosphor Thin Films Through Sol-Gel Processing

Abstract

Ca, Sr, Ce complex alkoxide solution was prepared from Ca(NO₃)₂ 4H₂0, Sr (NO₃)₂ and Ce (NO₃)₃⋅₆H₂O with ethylene glycol through sol-gel processing. Ca, Sr, Ce gel films were deposited on a silica glass substrate by spin coating method using the complex alkoxide solution. Ca_0.5Sr_0.5S 0.001CeS₂phosphor thin films were formed by firing at 750°C in flow H₂S gas. The emission spectrum of Ca_0.5Sr_0.5S⋅ 0.001CeS₂ phosphor thin films were detected nearly at 500 nm. It was equivalent to emission spectrum of Ca_0.5Sr_0.5S⋅0.001CeS₂ phosphor prepared by solid state reaction. Amorphous Ca_0.5Sr_0.5S⋅0.001CeS₂ thin film formed at 600°C also exhibited emission spectra, which were similar to those o f crystalline Ca_0.5Sr_0.5S0.001CeS₂ thin films fired at 750°C.