White light emission and optical gains from a Si nanocrystal thin film

We report a Si nanocrystal thin film consisting of free-standing Si nanocrystals, which can emit white light and show positive optical gains for its red, green and blue (RGB) components under ultraviolet excitation. Si nanocrystals with φ = 2.31 0.35 nm were prepared by chemical etching of Si powder...

Full description

Saved in:
Bibliographic Details
Published inNanotechnology Vol. 26; no. 47; pp. 475203 - 7
Main Authors Wang, Dong-Chen, Hao, Hong-Chen, Chen, Jia-Rong, Zhang, Chi, Zhou, Jing, Sun, Jian, Lu, Ming
Format Journal Article
LanguageEnglish
Published England IOP Publishing 27.11.2015
Subjects
Annealing
Emission
Filtering
Gain
Nanocrystals
optical gain
photoluminescence
Si nanocrystal
Silicon
Thin films
White light
Online AccessGet full text

Cover

More Information
Summary:We report a Si nanocrystal thin film consisting of free-standing Si nanocrystals, which can emit white light and show positive optical gains for its red, green and blue (RGB) components under ultraviolet excitation. Si nanocrystals with φ = 2.31 0.35 nm were prepared by chemical etching of Si powder, followed by filtering. After being mixed with SiO2 sol-gel and thermally annealed, a broadband photoluminescence (PL) from the thin film was observed. The RGB ratio of the PL can be tuned by changing the annealing temperature or atmosphere, which is 1.00/3.26/4.59 for the pure white light emission. The origins of the PL components could be due to differences in oxygen-passivation degree for Si nanocrystals. The results may find applications in white-light Si lasing and Si lighting.
Bibliography:NANO-107997.R1
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0957-4484
1361-6528
1361-6528
DOI:10.1088/0957-4484/26/47/475203