Photoluminescence from gas-suspended SiOx nanoparticles synthesized by laser ablation

被引：117

作者：

Geohegan, DB ^{[1
]}

Puretzky, AA ^{[1
]}

Duscher, G ^{[1
]}

Pennycook, SJ ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA

来源：

APPLIED PHYSICS LETTERS | 1998年 / 73卷 / 04期

关键词：

D O I：

10.1063/1.121892

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Time-resolved photoluminescence (PL) spectra are reported for gas-suspended 1-10 nm diameter SiOx particles formed by laser ablation of Si into 1-10 Torr He and Ar. Three spectral bands (1.8, 2.5 and 3.2 eV) similar to PL from oxidized porous silicon were measured, but with a pronounced vibronic structure. Particle size and composition were determined with Z-contrast transmission electron microscopy imaging and high resolution electron energy loss spectroscopy linescans of individual nanoparticles. Maximized violet (3.2 eV) PL from the gas-suspended nanoparticles was correlated with an ex situ SiO1.4 overall particle stoichiometry. Cryogenically-collected gas-suspended nanoparticles produced web-like-aggregate films exhibiting very weak FL. Standard anneals restored strong PL bands without vibronic structure, but otherwise in agreement with the PL measured from the gas-suspended nanoparticles. (C) 1998 American Institute of Physics.

引用

页码：438 / 440

页数：3

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