Abstract
In this article, a series of Eu-doped oxynitride phosphate glass samples are prepared. It is shown that the photoluminescence of Eu can be tuned through different alkaline earth metal ions (M 2+ ). The luminous intensity of Eu 2+ decreases with increasing ionic radius in the order of Mg＜Ca＜Sr＜Ba. And with the increased mismatch degree of radius between M 2+ and Eu ions, the luminescence of Eu 3+ gains intensity. The effects of M 2+ on structure and luminescence characteristics of glass are mainly due to the following three factors: the field strength of M 2+ , the degree of mismatch between M 2+ and Eu ions, and the influence of alkaline earth metals on the coordination tendency of N 3− and O 2− with Eu ions. The reduction mechanism is explained by combining the unequal substitution of Eu 3+ ions for divalent alkaline earth metal cations with the reduction of Eu 3+ by O 2− and N 3− ions. Our work provides a new perspective for studying the luminescence characteristics and mechanism of Eu ions in oxynitride Phosphate Glasses. • Eu 3+ captures the electron released from NHC and POHC and is reduced to Eu 2+ . • The introduction of N promotes the self-reduction of Eu 3+ ions. • Under large alkaline earth metal ion radius, Eu ion tends to coordinate with N 3− . • Tunable luminescence realized by doping with different alkaline earth metals.
Published Version
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