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Photoluminescence characterization of aged and regenerated mesoporous silica

机译:老化和再生的介孔二氧化硅的光致发光特性

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摘要

The investigation of the photoluminescence features of aged and regenerated mesoporous silica is reported. The emission spectrum of aged samples displays a blue band peaked at about 450 nm at room temperature with excitation channels at 250 and 200 nm. No UV emission band is detected. The regenerated samples recover the optical transparency of the samples, the vibrational properties in the 3000-3800 cm~(- 1) but for the isolated silanols band and the UV-blue emission features. Indeed beside the blue band peaked around 450 nm a UV band centred at 340 nm is reported whose relative contribution depends on the excitation wavelength. The aging and regeneration processes are discussed in view of the attribution of the observed emission features to specific surface defects.
机译:报道了老化的和再生的中孔二氧化硅的光致发光特征的研究。老化样品的发射光谱显示蓝带在室温下峰值约为450 nm,激发通道在250和200 nm。未检测到紫外线发射带。再生的样品恢复了样品的光学透明性,在3000-3800 cm-1(-1)范围内具有振动特性,但对于孤立的硅烷醇谱带和紫外-蓝色发射特性而言。实际上,据报道,除了蓝带在450 nm附近达到峰值外,还有一个以340 nm为中心的UV带,其相对贡献取决于激发波长。鉴于观察到的发射特征归因于特定的表面缺陷,讨论了老化和再生过程。

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