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Optical emission from C60-molecule-coupled Si nanocrystallites.
1National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China. hkxlwu@nju.edu.cn
The Journal of Chemical Physics
|July 21, 2004
Summary
This study reveals that C60-modified silicon nanocrystallites exhibit strong blue photoluminescence. This emission originates from specific defects within the silicon oxide layer, enhancing understanding of blue light from nanostructured silicon.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Physics
Background:
- Porous silicon and silicon nanocrystallites are investigated for optoelectronic applications.
- Understanding the origin of photoluminescence in silicon-based nanomaterials is crucial for device development.
Purpose of the Study:
- To investigate the origin of blue photoluminescence in C60-modified nanocrystalline silicon.
- To characterize the luminescent centers responsible for blue emission.
Main Methods:
- Surface passivation of silicon nanocrystallites with C60 molecules.
- Photoluminescence spectroscopy for characterization.
- Neutron irradiation experiments to support the proposed mechanism.
Main Results:
- A strong blue emission at approximately 460 nm was observed in C60/nanocrystalline Si systems after prolonged air storage.
- A luminescent center model involving an oxygen vacancy and interstitial oxygen in the SiOx layer was proposed.
- Radiative recombination within these centers explains the observed blue photoluminescence.
Conclusions:
- The study elucidates the mechanism behind blue emission in C60-modified silicon nanocrystallites.
- The findings contribute to a deeper understanding of light emission from silicon/oxygen nanostructures.
- This work has implications for developing novel silicon-based light-emitting materials.