کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5403374 | 1392758 | 2007 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of Si nanocluster size and carrier-Er interaction distance on the efficiency of energy transfer
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
The effects of Si nanocluster (Si-nc) size and spacing from Er3+ ions were investigated through studies made on appropriate configurations of multilayers obtained by reactive magnetron sputtering at 650 °C and subsequently annealed at 900 °C. Si-nc larger than about 5 nm appear ineffective for resonant excitation of Er because of the resulting weak confinement responsible for negligible direct radiative recombination. This direct no-phonon transition probability is closely correlated to the energy transfer rate, both decreasing when Si-nc size increases. For large Si-nc having a bandgap lower than 1.26 eV, the energy transfer to the upper levels (second, third, etc.) of Er3+ is no more possible, leading to the observed abrupt decrease of the 1.54-μm emission. The latter is governed by the distance separating Er ions from their Si-nc sensitizers, whose behavior was well described by an exponentially decreasing exchange interaction. The characteristic interaction distance was found to be dependent on the amorphous or crystalline nature of Si-nc, and it appears as small as 0.4±0.1 nm for the former (amorphous) and of some nanometers for the crystallized Si-nc.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 126, Issue 2, October 2007, Pages 581-589
Journal: Journal of Luminescence - Volume 126, Issue 2, October 2007, Pages 581-589
نویسندگان
F. Gourbilleau, C. Dufour, R. Madelon, R. Rizk,