Photoluminescence properties of silica-based mesoporous materials similar to those of nanoscale silicon

被引：0
|
作者：
Yu.D. Glinka
A.S. Zyubin
A.M. Mebel
S.H. Lin
L.P. Hwang
Y.T. Chen
机构：
[1] Institute of Atomic and Molecular Sciences,
[2] Academia Sinica,undefined
[3] P.O. Box 23-166,undefined
[4] Taipei 106,undefined
[5] Taiwan,undefined
[6] R.O.C.,undefined
[7] Institute of Surface Chemistry of the National Academy of Sciences of Ukraine,undefined
[8] prospekt Nauki 31,undefined
[9] Kiev 252650,undefined
[10] Ukraine,undefined
[11] Institute of Problems of Chemical Physics,undefined
[12] Russian Academy of Sciences,undefined
[13] Chernogolovka,undefined
[14] Moscow Region 142432,undefined
[15] Russia,undefined
[16] Department of Chemistry,undefined
[17] National Taiwan University,undefined
[18] Taipei 106,undefined
[19] Taiwan,undefined
[20] R.O.C.,undefined
来源：
The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics | 2001年 / 16卷
关键词：
PACS. 78.55.-m Photoluminescence – 78.55.Mb Porous materials – 71.15.Mb Density functional theory, local density approximation, gradient and other corrections;
D O I：
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中图分类号：
学科分类号：
摘要：
Photoluminescence (PL) from composites of 7- and 15-nm sized silica nanoparticles (SNs) and mesoporous silicas (MSs) induced by 266- (4.66-) and 532-nm (2.33-eV) laser light has been studied at room temperature. The multiband PL from MSs in the range of 1.0-2.1 eV is evidenced to originate from isolated bulk and surface non-bridging oxygens (NBOs) and from NBOs combined with variously placed 1-nm sized pore wall oxygen vacancies (OVs). The nature and diversity of NBO light-emitters are confirmed by ab initio calculations. The PL from SNs exhibits only a short wavelength part of the bands (1.5-2.1 eV) originated from isolated bulk and surface NBOs. This fact indicates that the highly OV-bearing structures occur only in extremely thin (∼ 1 nm) silica layers. The similarity of spectroscopic properties of silica-based nanoscale materials to those of surface-oxidized silicon nanocrystals and porous silicon, containing silica-passivating layers of the same width, is discussed.
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页码：279 / 283
页数：4
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