Abstract
The influence of site occupancy of Li +, including substitutional and interstitial sites, on the upconversion emissions of Er 3+ doped Y 3Al 5O 12 powders is reported. The intensity of green emission increases slightly when the Li + occupies substitutional site, but when the Li + enters into interstitial site it enhances drastically accompanied with a change of emission spectra. These phenomena originate from the increase, induced by interstitial Li +, in the lifetime of 4 I 11 / 2 level, the ratio of radiation rate in green emission and the absorptivity at 980 nm.
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