介孔二氧化硅的时间分辨紫外光致发光

Time resolved ultraviolet photoluminescence of mesoporous silica.

作者信息

Anedda Alberto, Carbonaro Carlo M, Clemente Francesca, Corpino Riccardo, Ricci P Carlo

机构信息

Dipartimento di Fisica, Università di Cagliari and INFM UdR Cagliari, Cittadella Universitaria, I-09042 Monserrato (Ca), Italy.

出版信息

J Phys Chem B. 2005 Jan 27;109(3):1239-42. doi: 10.1021/jp0471397.

DOI:10.1021/jp0471397

PMID:16851086

Abstract

We studied the optical properties of sol-gel synthesized porous silica excited by synchrotron radiation in the 4-10 eV range. The spectral and temporal characteristics of the ultraviolet photoluminescence at about 3.7 eV are reported. The UV emission results from the contribution of two different centers: the first one centered at 3.7 eV with a decay time of 2.0 ns and the second one peaked at 3.9 eV with a decay time of 20 ns. We propose to assign the observed luminescence to different interacting surface silanols.

摘要

我们研究了在4 - 10电子伏特范围内由同步辐射激发的溶胶 - 凝胶合成多孔二氧化硅的光学性质。报道了约3.7电子伏特处紫外光致发光的光谱和时间特性。紫外发射来自两个不同中心的贡献：第一个中心位于3.7电子伏特，衰减时间为2.0纳秒，第二个中心在3.9电子伏特处达到峰值，衰减时间为20纳秒。我们建议将观察到的发光归因于不同相互作用的表面硅醇。