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SiO 2 doped with Er 3+ and Tm 3+ rare earth ions was prepared by sol–gel process. Three band emission, blue (460nm Tm), green (520nm Er), red (665nm Er, 705nm Tm) and (NIR) near infra-red (875nm Er or 865nm Tm) from Tm or Er single doped SiO 2 powder were measured. Simultaneous emission of Er and Tm ions was observed in the co-doped SiO 2 powder samples. Red,...
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