Abstract
The current search for efficient upconversion (UC) materials is driven by numerous potential applications; one of them is solar cell efficiency improvement. The data on the absolute UC efficiency of materials are of extreme importance for estimation of real feasibility of approaches suggested for applications; however, these data have been reported only for a few materials. In 1, an indirect method of evaluation of the significance of upconversion materials for solar cells is proposed. We discuss this method and support our considerations by the results of experimental measurements of the absolute UC efficiency of Er-doped modified ZBLAN glass.
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