Ultranarrow Luminescence Linewidth of Silicon Nanocrystals and Influence of Matrix
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- 作者：Ilya Sychugov ; Anna Fucikova ; Federico Pevere ; Zhenyu Yang ; Jonathan G. C. Veinot ; Jan Linnros
- 刊名：ACS Photonics
- 出版年：2014
- 出版时间：October 15, 2014
- 年：2014
- 卷：1
- 期：10
- 页码：998-1005
- 全文大小：494K
- ISSN：2330-4022
文摘
The luminescence linewidth of individual silicon nanocrystals was characterized by single-dot spectroscopy, and an ultranarrow linewidth of 鈭?00 渭eV at 10 K was found. This value is, in fact, limited by system resolution and represents only the upper limit of the homogeneous linewidth. In addition, the effect of the matrix was investigated for nanocrystals coated with organic ligands, embedded in silicon dioxide, as well as for nanocrystals with only a thin passivating layer. It was found that, depending on the matrix, the room-temperature bandwidth may vary by an order of magnitude, where values as small as 鈭?2 meV (鈭? nm) at 300 K were detected for nanocrystals with a thin passivation. The observed values for silicon nanocrystals are similar and even surpass some of those for direct-band-gap quantum dots. The narrow linewidth at room temperature enables the use of silicon nanocrystals for nontoxic narrow-band labeling of biomolecules and for application as phosphors in white-light-emitting devices.