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Infrared to visible upconversion of Er3+ ions in Yb3+ doped fluorohafnate glasses |
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| Affiliation: | 1. Lobachevsky State University of Nizhny Novgorod, 23 Prospekt Gagarina, Nizhny Novgorod, Russia;2. G.G. Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences, 49 Tropinin str., Nizhny Novgorod, Russia;1. School of Physics, University of Sydney, Camperdown, NSW 2006, Australia;2. School of Electronic Engineering, La Trobe University, Bundoora 3083, Australia |
| Abstract: | The upconversion of infrared radiation into green and red luminescence has been studied for Er3+ and Yb3+ ions in fluorohafnate glasses. At room temperature normalized upconversion efficiency of 8.4x10-4 cm2/W has been obtained for the green emission (545 nm) of Er3+ in doped samples containing 4.5 mol% (Yb3+) and 0.75 mol% (Er3+) pumped by 974 nm light with an absorbed intensity of 2.5 mW/cm2. Both green and red upconversion radiations slightly decrease with increasing temperature. Room-temperature measured efficiency is compared with the calculated one obtained from the rate equation model of Wright. |
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