Eu2+掺杂P2O5-BaO-Na2O-K2O与Na2O-TeO2-ZnO系统玻璃的制备与光谱性质

用高温熔融法,把Eu₂O₃掺入到P₂O₅-BaO-Na₂O-K₂O与Na₂O-TeO₂-ZnO系统玻璃中。测定了玻璃的荧光光谱与激发光谱。结果表明,Eu离子在P₂O₅-BaO-Na₂O-K₂O玻璃中呈现出Eu³⁺态。然而在Na₂O-TeO₂-ZnO系统玻璃中,尽管在空气气氛下,大部分的Eu离子在玻璃中以二价的状态存在。从玻璃的结构及化学组分解释了产生Eu²⁺的原因。在磷酸盐玻璃配料中加入适量的硅粉(Si)作还原剂,能有效地把玻璃中的极大部分Eu³⁺还原成Eu²⁺,获得含Eu²⁺的优质透明磷酸盐玻璃。

Preparation of P2O5-BaO-Na2O-K2O and Na2O-TeO2-ZnO Glasses Containing Eu2+ and Their Emission Spectra

The preparations and optical spectra of Eu²⁺ ions doped-glass have been attracted much attentions due to their applications in optical devices such as Faraday rotators, lasers, high dense light storage and so on. In order to obtain more Eu²⁺ ions, many complex preparations have been done, for example under strong reductive atmosphere and so on. It is necessary to explore easy and simple method that can obtain glasses with high concentration of Eu²⁺. In the present paper, under air atmosphere Eu₂O₃ incorporated P₂O₅-BaO-Na₂O-K₂O glasses and Na₂O-TeO₂-ZnO glasses were prepared by melting at 1200℃. The emission spectra of Eu ions in the glasses were measured at room temperature. The structural and compositional effects on the valence-state of Eu ions were discussed. The results indicated that the Eu ions in the phosphate glass exist in the state of trivalent. However, some of the Eu ions in the Na₂O-TeO₂-ZnO glasses were divalent, although the glasses were prepared under air atmosphere. The Eu³⁺ ions could be effectively reduced to Eu²⁺ ions by the reductive action of silicon powder. Since the network of the tellurate glasses easily distorted and zinc oxide presented, Eu ions replaced the sites of the Zn²⁺ ions and the Eu²⁺ ions exist steadily in the glasses. The tellurate glasses containing overall Eu²⁺ ions with good optical property can be prepared by the proper melting processing and addition of silicon quantity.