Synthesis of Red‐Emitting, Small Particle Size Luminescent Oxides Using an Optimized Combustion Process

摘要: A novel ceramic synthesis technique, combustion synthesis, was explored to produce red-emitting Cr{sup 3+}-doped Y{sub 3}Al{sub 5}O{sub 12} and Eu{sup 2}O{sub 3} phosphors with improved physical luminescent properties. This technique involves the reaction of metal nitrates (oxidizers) an organic fuel (urea, carbohydrazide, glycine) at 500 C. Resulting powders are well-crystallized, a large surface area small particle size. The spectral energy distribution observed using photoluminescence measurements. effects processing parameters such as type fuel, fuel-to-oxidizer ratio, furnace temperature, batch water content were studied. An increase in phosphor brightness increasing temperature observed. Postreaction heat treatments (1000, 1300, 1600 C) increased luminous intensity as-synthesized powders. Residual carbon chromium site symmetry investigated possible explanations for treatment temperature. By tailoring chemistry, optimal conditions producing most have been identified.