کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1547486 | 997636 | 2007 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Stimulated emission from trapped excitons in SnO2 nanowires
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
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چکیده انگلیسی
The pump fluence dependent photoluminescence (PL) spectra of SnO2 nanowires were investigated, which were synthesized with a high-temperature chemical reduction method. The integrated intensity of the narrower peak at 3.2Â eV experiences a strong superlinear dependence on the pump fluence, and the narrowest width of the sharp peak is only 19Â meV. Moreover, under high excitation fluence, an ultrafast decay time (less than 20Â ps) appears in the time-resolved PL spectra. The emission of these SnO2 nanowires shows strong apparent stimulated emission behaviors although the SnO2 is a dipole forbidden direct gap semiconductor. The stimulated emission should relate to the localized islands on the surface of nanowire, which was observed through the high resolution transmission electron microscopy (HRTEM) image. The giant-oscillator-strength effect of bound exciton generated from the localized islands was considered to induce the stimulated emission of SnO2 nanowires.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica E: Low-dimensional Systems and Nanostructures - Volume 39, Issue 2, September 2007, Pages 223-229
Journal: Physica E: Low-dimensional Systems and Nanostructures - Volume 39, Issue 2, September 2007, Pages 223-229
نویسندگان
RuiBin Liu, YuJin Chen, FeiFei Wang, Li Cao, AnLian Pan, Guozhen Yang, Taihong Wang, Bingsuo Zou,