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Er 3+ /Yb 3+ co-doped ZrO 2 –Al 2 O 3 powders are prepared by a solid-state reaction method. The up-conversion luminescence spectra excited by 980nm shows three main emission bands. One red emission band is centered at 654nm and two green ones are centered at 545 and 525nm, corresponding to the transitions of 4 F 9/2 → 4 I 15/2 ...
Er 3+ :ZnO powder has been prepared by fluoride salt decomposition method. Upon continuous wave excitation around 980nm, Er 3+ :ZnO powder exhibit intense red emission originating from the 4 F 9/2 level of Er 3+ . The ratio of integrated emission at 650nm to that at 540nm is 21:1 with excitation of a diode laser of 10mW at room temperature. The up-conversion...
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