Abstract
Mn4+ doped and Mn4+/Cr3+ co-doped alkali metal titanate phosphors have been prepared by solid state reaction method. A part of Li+ ions in the Li2MgTiO4: Mn4+ are substituted with Na+ and K+ ions and consequently the intensity of Mn4+ emission at 678nm is enhanced by 1.7 and 2.5 times, respectively. In the Mn4+/Cr3+ co-doped (Li0.95K0.05)2MgTi0.999O4, both emission of Cr3+at 726nm and emission of Mn4+ at 678nm of Mn4+ are observed. It is interesting to find that the intensity ratio of 726–678nm emissions in the Mn4+/Cr3+ phosphor continually increases with excitation wavelength increasing from 290nm to 455nm, which means that the intensity ratio in turn can be used to identify the excitation light wavelength. This refers a possible approach to design novel compact light-wavelength detector or spectrometer based on the phosphor. The mechanism of Na+ or K+ substitution induced luminescence enhancement in the Mn4+ phosphor and the competition between the Cr3+ and Mn4+ emissions in the Mn4+/Cr3+ co-doped has been discussed.
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