Ultrafast optical spectroscopy of surface-modified silicon quantum dots: unraveling the underlying mechanism of the ultrabright and color-tunable photoluminescence

Lei Wang; Qi Li; Hai-Yu Wang; Jing-Chun Huang; Ran Zhang; Qi-Dai Chen; Huai-Liang Xu; Wei Han; Zheng-Zhong Shao; Hong-Bo Sun

doi:10.1038/lsa.2015.18

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Ultrafast optical spectroscopy of surface-modified silicon quantum dots: unraveling the underlying mechanism of the ultrabright and color-tunable photoluminescence

Original Articles

- Ultrafast optical spectroscopy of surface-modified silicon quantum dots: unraveling the underlying mechanism of the ultrabright and color-tunable photoluminescence
- Light: Science & Applications Vol. 4, Issue 1, (2015)
- Affiliations：
  
  1.State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
  2.College of Physics, Jilin University, Changchun 130012, China
  3.State Key Laboratory of Molecular Engineering of Polymers, Advanced Material Laboratory, Department of Macromolecular Science, Fudan University, Shanghai 200433, China
- Author bio：
  
  HY Wang, State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China Email: haiyu_wang@jlu.edu.cn
  Or HB Sun, State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China E-mail: hbsun@jlu.edu.cn
- Funds：
- DOI：10.1038/lsa.2015.18
  CLC：
- Published：2015-03，
  
  Published Online：04 December 2014，
  
  Received：16 August 2014，
  
  Revised：26 November 2014，
  
  Accepted：01 December 2014
- Accepted：
Scan QR Code
Wang, L. et al. Ultrafast optical spectroscopy of surface-modified silicon quantum dots: unraveling the underlying mechanism of the ultrabright and color-tunable photoluminescence. Light: Science & Applications, 4, e245 (2015).
DOI：

Wang, L. et al. Ultrafast optical spectroscopy of surface-modified silicon quantum dots: unraveling the underlying mechanism of the ultrabright and color-tunable photoluminescence. Light: Science & Applications, 4, e245 (2015). DOI： 10.1038/lsa.2015.18.

摘要

Abstract

In this work

the fundamental mechanism of ultrabright fluorescence from surface-modified colloidal silicon quantum dots is investigated in depth using ultrafast spectroscopy. The underlying energy band structure corresponding to such highly efficient direct bandgap-like emissions in our surface-modified silicon quantum dots is unraveled by analyzing the transient optical spectrum

which demonstrates the significant effect of surface molecular engineering. It is observed that special surface modification

which creates novel surface states

is responsible for the different emission wavelengths and the significant improvement in the photoluminescence quantum yields. Following this essential understanding

surface-modified silicon quantum dots with deep blue to orange emission are successfully prepared without changing their sizes.

关键词

Keywords

quantum confinementsilicon quantum dotssurface molecular engineeringultrafast spectroscopywave function modification

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