Luminescence of M ions (M=C Fe Co Ni Mn Ti) in ��-Al���O��� phosphor

A polyacrylamide gel route is used to synthesize the alumina-based light-emitting material M: α-Al₂O₃ (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 α-Al₂O₃ phase. The structure analysis shows that the carbon Ti Co Ni doped Al₂O₃ powders obvious suppress the formation of α-Al₂O₃ in contrast the Fe Mn doped Al2O3 can accelerate the formation of α-Al₂O₃. The carbon and metal salt introduction to the Al₂O₃ precursor solution obvious influenced the sample morphology band-gap color and photoluminescence properties. The results show that the carbon and metal salt introduced to Al₂O₃ precursor solution reduces the band-gap values and enhances the photoluminescence properties of M: α-Al₂O₃ powders. The photoluminescence mechanisms of M: α-Al₂O₃ powders have been discussed on the basis of the experimental results. The M: α-Al₂O₃ 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.