Praseodymium-doped calcium stannates phosphor coatings prepared by electrostatic spray deposition

Ca2SnO4:Pr3+ phosphor coatings were prepared on silica glass substrates at a low temperature by electrostatic spray deposition using a soluble inorganic salt. The deposited films were pyrolyzed at 500 °C for 1 h in air. Final annealing was performed at 1000 °C for 1 h in air. Gels dried at 80 °C for 24 h were subjected to thermogravimetric analysis at 25–925 °C to analyze the thermal decomposition process. Crystal structure and surface morphology of the films were examined by X-ray diffraction analysis and scanning electron microscopy. Photoluminescence spectra were measured by a fluorescent spectrophotometer. The phosphor film annealed at 1000 °C showed orthorhombic structure and red emission at 626 nm.