Abstract
In this work, we report permanent reduction of Eu 3+ to Eu 2+ in sodium borate glasses by irradiation of near-infrared femtosecond laser. Glass composition of sodium borate was 85B 2O 3–15Na 2O. The glasses were doped with 0.05, 0.1, and 0.5 mol% Eu 2O 3. Absorption and fluorescence dynamics were studied to investigate valence state change of europium ions and the energy transfer between Eu 2+ and Eu 3+ ions. As the femtosecond laser intensity or exposure time increases, the emission band at 400 nm becomes stronger. However, the photoreduction efficiency decreases as the dopant concentration increases. We discuss the photoreduction mechanism under multiphoton absorption.
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