Bright White Light Emission from Ultrasmall Cadmium Selenide Nanocrystals

A simple treatment method using formic acid has been found to increase the fluorescence quantum yield of ultrasmall white light-emitting CdSe nanocrystals from 8% to 45%. Brighter white-light emission occurs with other carboxylic acids as well, and the magnitude of the quantum yield enhancement is s...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2012-05, Vol.134 (19), p.8006-8009
Main Authors: Rosson, Teresa E, Claiborne, Sarah M, McBride, James R, Stratton, Benjamin S, Rosenthal, Sandra J
Format: Article
Language:English
Subjects:
Cadmium Compounds - chemistry
CADMIUM SELENIDES
CARBOXYLIC ACIDS
CHAINS
Color
FLUORESCENCE
Formates - chemistry
FORMIC ACID
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
Light
LUMINESCENCE
Nanoparticles - chemistry
Particle Size
Selenium Compounds - chemistry
Spectrum Analysis
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Description
Summary:A simple treatment method using formic acid has been found to increase the fluorescence quantum yield of ultrasmall white light-emitting CdSe nanocrystals from 8% to 45%. Brighter white-light emission occurs with other carboxylic acids as well, and the magnitude of the quantum yield enhancement is shown to be dependent on the alkyl chain length. Additionally, the nanocrystal luminescence remains enhanced relative to the untreated nanocrystals over several days. This brightened emission opens the possibility for even further quantum yield improvement and potential for use of these white-light nanocrystals in solid-state lighting applications.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja300132p