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SiO 2 glass doped with Ni 2+ and Mn 2+ has been prepared by the sol–gel process. Very strong visible light (its fluorescence efficiency is about 4 times of that of undoped sol–gel SiO 2 glass and about 160 times of that of ZnS nanocrystallites) from the SiO 2 glass doped with Ni 2+ and Mn 2+ has been observed. The emission wavelength of Ni ...
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