Abstract
Mn2+-doped 1Al2O3-99SiO2 glasses have been prepared by a sol-gel method and their photoluminescence (PL) properties have been studied for the first time. The effect of ZrO2 and TiO2 on the luminescence properties has also been studied. In addition, the PL of Mn: 1Al2O3-99SiO2 is compared with Mn:SiO2. The emission spectra of all the samples containing Al2O3 show a band around 620 nm, and the sample without Al2O3 shows two bands around 620 and 650 nm. These emission bands are all assigned to the 4T1 → 6A1 transition of octahedrally coordinated Mn2+ · ZrO2 and TiO2 have fluorescence quenching effect. The relative fluorescence intensity of Mn2+-doped sol-gel 1Al2O3-99SiO2 is much stronger than that of Mn2+-doped sol-gel SiO2. The difference of the emission wavelength between host materials is explained in terms of the ligand field effect.
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