Luminescent sintered silica glass prepared by adsorbing Pr ions into mesoporous SiO2-PVA nanocomposite
Luminescent sintered silica glass prepared by adsorbing Pr ions into mesoporous SiO2-PVA nanocomposite
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DOI：
10.1177/0021998315608430
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发表时间：
2016-08-01
影响因子：
2.9
通讯作者：
Fujino, Shigeru
中科院分区：
文献类型：
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作者：
Ikeda, Hiroshi;Murata, Takahiro;Fujino, Shigeru
通过将介孔SiO2-聚乙烯醇（PVA）纳米复合材料浸渍在硝酸镨溶液中，然后在1100 ℃烧结，制备出了Pr 3+掺杂的单块石英玻璃。在空气中烧结玻璃在紫外光激发下呈现粉红色发光。玻璃的光致发光强度取决于Pr离子的总浓度，这是通过改变硝酸镨溶液的浓度和浸泡时间来调节。通过使用1-或10-mM Pr溶液在60 min的浸泡时间下制备具有最高光致发光强度的玻璃。为了揭示浸渍条件如何影响光致发光强度，我们分析和讨论了Pr离子在介孔纳米复合材料表面上的吸附动力学。当浸渍时间小于60 min时，Pr离子扩散到纳米复合材料的孔隙中，没有发生聚集。为了制备具有高光致发光的Pr 3+掺杂石英玻璃，必须控制Pr溶液的浓度和浸泡时间。
A monolithic silica glass doped with Pr3+ was prepared by immersing a mesoporous SiO2-polyvinly alcohol (PVA) nanocomposite in a Pr nitrate solution and then sintering it at 1100? in air. The sintered glass exhibited pink emission when excited by ultraviolet irradiation. The photoluminescence intensity of the glass depended on the total concentration of Pr ions, which was adjusted by changing the concentration of the Pr nitrate solution and the immersion time. The glass with the highest photoluminescence intensity was prepared by using a 1- or 10-mM Pr solution at an immersion time of 60min. To reveal how the immersion conditions affected the photoluminescence intensity, we analyzed and discussed the adsorption kinetics of the Pr ions onto the surface of the mesoporous nanocomposite. At immersion times below 60min, the Pr ions diffused into pores of the nanocomposite without aggregating. To prepare Pr3+-doped silica glass with high photoluminescence, both the concentration of the Pr solution and the immersion time must be controlled.