کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1483961 1510514 2009 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Luminescence properties of nonbridging oxygen hole centers at the silica surface
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Luminescence properties of nonbridging oxygen hole centers at the silica surface
چکیده انگلیسی

Two variants of the surface-nonbridging oxygen hole center, (Si–O)3Si–O
• and (Si–O)2(H–O)Si–O
• , stabilized in porous films of silica nano-particles were investigated by time resolved luminescence excited in the visible and UV spectral range by a tunable laser system. Both defects emit a photoluminescence around 2.0 eV with an excitation spectrum evidencing two maxima at 2.0 and 4.8 eV, this emission decreases by a factor ∼2 on increasing the temperature from 8 up to 290 K. However, the different local structure influences the emission lineshape, the quantum yield and the decay lifetime. Such peculiarities are discussed on the basis of the symmetry properties of these defects.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 355, Issues 18–21, 1 July 2009, Pages 1020–1023
نویسندگان
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