论文部分内容阅读
Er~(3+)/Yb~(3+) co-doped silica-alumina monolithic xerogels were prepared with the same concentration on 2 000 Er/Si ppm and 6 000 Al/Si ppm.The Yb/Si content was varied from 0 to 4 000 ppm.Densification of the samples was achieved by thermal treatment in air at 950 ℃ for 120 hours with a heating rate 0.1 ℃/min.Photoluminescence spectroscopy was used to obtain information about the effective excitation efficiency of Er~(3+) ions by co-doping with Yb 3+ ions.The infrared-to-visible up-conversion luminescence has been investigated upon continuous wave excitation at 980 nm.The samples exhibit red,green and blue up-conversion emission.It is found that the intensity of up-conversion luminescence increases with increasing Yb~(3+) doping concentration.An opposite behavior is observed for the 4I_(13/2) luminescence of the Er~(3+) ions.
Er ~ (3 +) / Yb ~ (3+) co-doped silica-alumina monolithic xerogels were prepared with the same concentration on 2 000 Er / Si ppm and 6 000 Al / Si ppm.The Yb / Si content was varied from 0 to 4 000 ppm. Densification of the samples was achieved by thermal treatment in air at 950 ° C for 120 hours with a heating rate 0.1 ° C / min. Photoluminescence spectroscopy was used to obtain information about the effective excitation efficiency of Er ~ (3+ ) ions by co-doping with Yb 3+ ions. The infrared-to-visible up-conversion luminescence has been investigated upon continuous wave excitation at 980 nm. The samples exhibit red, green and blue up-conversion emission. It is found that the intensity of up-conversion luminescence increases with increasing Yb ~ (3+) doping concentration. An opposite behavior is observed for the 4I_ (13/2) luminescence of Er ~ (3+) ions.