Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/5635
Title: Observation of white-light amplified spontaneous emission from carbon nanodots under laser excitation
Authors: Zhang, WF
Tang, L
Yu, SF 
Lau, SP 
Keywords: Carbon
Emission spectroscopy
Spontaneous emission
Issue Date: 1-Apr-2012
Publisher: Optical Society of America
Source: Optical materials express, 1 Apr. 2012, v. 2, no. 4, p. 490-495 How to cite?
Journal: Optical materials express 
Abstract: A conventional laser irradiation method is applied to fabricate carbon nanodots (C-dots). By uniformly dispersing the C-dots into NMethylpyrrolidone (NMP) solution, white-light amplified spontaneous emission can be observed from the mixture under laser excitation at 266 nm. Peak wavelength and linewidth of the emission spectra are found to be around 450 and 120 nm respectively. It is verified that the presence of NMP enhances the emission efficiency of C-dots over the broad emission spectrum. This is because the excitation energy, which is not absorbed by the C-dots, is captured by the NMP and is subsequently transferred to the Cdots. Optical gain per peak power of the mixture at ~450 nm is found to be ~64 cm⁻¹MW⁻¹, which is about 39% higher than that without the use of NMP.
URI: http://hdl.handle.net/10397/5635
ISSN: 2159-3930 (eISSN)
DOI: 10.1364/OME.2.000490
Rights: © 2012 Optical Society of America. This paper was published in Optical Materials Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ome/abstract.cfm?uri=ol-2-4-490. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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