Effects of N,N-dimethylacetamide as drying control chemical additive on characteristics of Zn₂SiO₄:Mn,Ba phosphor powders prepared by spray pyrolysis

Zn₂SiO₄:Mn,Ba phosphor powders were prepared by ultrasonic spray pyrolysis from spray solutions with and without a drying control chemical additive (DCCA). N,N-dimethylacetamide (DMA) used as the DCCA affected the morphology, surface area, mean crystallite size, and photoluminescence intensity of Zn₂SiO₄:Mn,Ba phosphor powders. The phosphor powders prepared from a spray solution with an optimum concentration of DMA of 1M had a finer size and narrower size distribution than those prepared from a spray solution without DMA. The mean crystallite size of the phosphor powders was changed from 37 to 44 nm depending on the concentration of DMA added to the spray solutions. The Brunauer-Emmett-Teller (BET) surface areas of the phosphor powders prepared from spray solutions with concentrations of DMA of 0.5, 1, and 3 M were 5.1, 3.2, and 2.1m²/g, respectively. The phosphor powders prepared from the spray solution with an optimum concentration of DMA of 1M had an 8% higher photoluminescence intensity than the commercial product.