期刊
JOURNAL OF LUMINESCENCE
卷 138, 期 -, 页码 39-43出版社
ELSEVIER
DOI: 10.1016/j.jlumin.2013.01.027
关键词
Silica nanoparticles; Surface defects; Time-resolved photoluminescence; UV laser irradiation; Conversion processes
类别
资金
- FAE project, PO FESR Sicilia [2007/2013 4.1.1.1]
- group of the Laboratory of Amorphous Materials Physics (Palermo University)
The effects induced on the blue luminescence centered around 2.8 eV, characteristic of silica nanoparticles, were investigated by monitoring its intensity during and after exposure to the third and the fourth harmonic of a Nd:YAG pulsed laser. The luminescence trend is found to be dependent on the UV photon energy: 3.50 eV photons induce a partial bleaching followed by a recovery in the postirradiation stage; 4.66 eV photons cause a total bleaching permanent after the irradiation. These results are interpreted as the conversion of luminescent defects towards stable and metastable configurations. (C) 2013 Elsevier B.V. All rights reserved.
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