Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
The size dependence of semiconductor nanocrystals has been well explored for decades. This well-known size dependence enables NC to be used in lighting applications based upon the narrow emission from the core excitons. These excitonics of the core are well studied and well exploited in applications. In stark contrast the surface of the NC is at the forefront of a modern understanding NC. While there are some initial works on the surface science of NC, there is as yet no work on whether the surface maintains size dependent phenomena. Moreover can any size dependent surface phenomena be exploited in optical applications?
Here we reveal the size dependence of the surface emission from CdSe semiconductor nanocrystals for the first time. Via careful synthetic control of the sizes and surface passivations of ultrasmall CdSe NC, we show that there is a clear size dependence to specific aspects of the surface emission. The fraction of light emitted from the surface increases with surface area. We rationalize this observation in light of a strong size dependence to the surface Gibbs energy. This size dependence to the surface Gibbs energy provides a rational route to creating white light from a single nanocrystal.
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