Ion beam induced luminescence in amorphous silica: Role of the silanol group content and the ion stopping power
Ion beam induced luminescence in amorphous silica: Role of the silanol group content and the ion stopping power
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DOI：
10.1016/j.jnoncrysol.2015.08.002
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发表时间：
2015-11
影响因子：
3.5
通讯作者：
D. Bachiller-Perea;D. Jiménez-Rey;A. Muñoz-Martín;F. Agullo-lopez
中科院分区：
文献类型：
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作者：
D. Bachiller-Perea;D. Jiménez-Rey;A. Muñoz-Martín;F. Agullo-lopez
用MeV能量的轻离子（H、He）和重离子（C、Si、Br）对三种不同硅醇含量（可忽略、中等和高）的SiO2进行了原位发光（IL）的比较实验。在所有情况下，IL光谱由两个主要特征组成：峰值在460 nm（2.7 eV）的蓝色带和峰值在650 nm（1.9 eV）的红色带。这两种排放的相对产量和它们的动力学作为注量的函数是强烈敏感的离子阻止能力，也是适度依赖于OH含量。IL的动力学行为进行了讨论，与以前的结果，从红外光谱得到的二氧化硅网络压实。我们证实，辐照引起的结构无序在自陷激子迁移到色心复合中起着至关重要的作用。增加OH含量的主要作用是大大提高红光与蓝光发射产额的比率。这可以解释由一个额外的非桥接氧空穴中心产生通道产生的外部Si-O-H键的断裂通过电子激发，与应变的本征键的断裂竞争。
Comparativein situionoluminescence (IL) experiments using light (H, He) and heavy ions (C, Si, Br) at MeV energies have been performed on three types of silica with different silanol group content (negligible, medium and high). In all cases the IL spectra consist of two predominant features: a blue band peaked at 460 nm (2.7 eV) and a red band peaked at 650 nm (1.9 eV). The relative yields of these two emissions and their kinetics as a function of fluence are strongly sensitive to the ion stopping power and are, also, moderately dependent on the OH content. The IL kinetic behavior is discussed in relation to previous results of the silica network compaction obtained from infrared spectroscopy. We confirm that the structural disordering induced by irradiation plays a crucial role on the migration of self-trapped excitons up to the recombination in color centers. The main effect of an increasing OH content is to greatly enhance the ratio of the redversusthe blue emission yield. This can be explained by an additional non-bridging oxygen hole center generation channel produced by the scission of extrinsic Si–O–H bonds by electronic excitation that competes with the scission of strained intrinsic bonds.