📖 Luminescence of M ions (M=C, Fe, Co, Ni, Mn, Ti) in ?-Al?O? phosphor. Insight into the effects of metal salt and sintering temperature on the luminescence of M:?-Al?O? phosphor.

A polyacrylamide gel route is used to synthesize the alumina-based light-emitting material M: ?-Al?O? (M=C, Fe, Co, Ni, Mn, Ti). Sintering temperature, pH value, organic additive, chelating agent, C and metal salt can significantly effects the formation of rhombohedral ?-Al?O? phase. The structure analysis shows that the carbon, Ti, Co, Ni doped Al?O? powders obvious suppress the formation of ?-Al?O?, in contrast, the Fe, Mn doped Al2O3 can accelerate the formation of ?-Al?O?. The carbon and metal salt introduction to the Al?O? precursor solution obvious influenced the sample morphology, band-gap, color and photoluminescence properties. The results show that the carbon and metal salt introduced to Al?O? precursor solution reduces the band-gap values and enhances the photoluminescence properties of M: ?-Al?O? powders. The photoluminescence mechanisms of M: ?-Al?O? powders have been discussed on the basis of the experimental results. The M: ?-Al?O? composites making them promising candidates as efficient light-emitting materials, pigments, photocatalysts and radiation detection including space dosimetry, environmental dosimetry, medical dosimetry and personal dosimetry.