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Luminescence properties of Cr-doped silica sol gel glasses

机译：Cr掺杂硅溶胶玻璃的发光性能

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Abstract: The emission of Cr-doped silica glass obtained by the sol- gel method is characterized by an orange broad band with a maximum at 610 nm. Its nature is examined by the absorption, excited state absorption, emission, excitation and lifetime measurements over a wide range of temperature and for different concentration of Cr ions. Our measurement show that in spite of fact that the absorption properties of Cr- doped silica sol-gel glass are predominantly associated with Cr$+4$PLU$/ centers, the observed in visible range emission can be assigned neither to Cr$+3$PLU$/ nor to Cr$+4$PLU$/ ions. The discussion of the nature of observed emission was carried out for all possible valencies of the Cr ions. In conclusion is suggested that it may be ascribed to the transitions on the monovalent Cr$+1$PLU$/ ion. The reducing agents occurring during the sol-gel process and leading to lowering the Cr valency are discussed. !13
机译：摘要：通过溶胶-凝胶法获得的掺铬石英玻璃的发射具有橙色宽带，其最大波长为610 nm。通过在很宽的温度范围内以及不同浓度的Cr离子的吸收，激发态吸收，发射，激发和寿命测量来检查其性质。我们的测量结果表明，尽管事实上，Cr掺杂的硅溶胶玻璃的吸收特性主要与Cr $ + 4 $ PLU $ /中心相关，但在可见光范围内观察到的发射均不能归因于Cr $ + 3 $ PLU $ /离子或Cr $ + 4 $ PLU $ /离子。对所有可能的Cr离子价态进行了观察到的发射性质的讨论。结论表明，这可能归因于单价Cr $ + 1 $ PLU $ /离子上的跃迁。讨论了在溶胶-凝胶过程中出现并导致Cr价降低的还原剂。 ！13

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