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Nanomaterials 2016, 6(2), 32; doi:10.3390/nano6020032

Energy Transfer between Conjugated Colloidal Ga2O3 and CdSe/CdS Core/Shell Nanocrystals for White Light Emitting Applications

Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada
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Author to whom correspondence should be addressed.
Academic Editor: Thomas Nann
Received: 31 December 2015 / Revised: 21 January 2016 / Accepted: 4 February 2016 / Published: 15 February 2016
(This article belongs to the Special Issue Current Trends in Colloidal Nanocrystals)
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Abstract

Developing solid state materials capable of generating homogeneous white light in an energy efficient and resource-sustainable way is central to the design of new and improved devices for various lighting applications. Most currently-used phosphors depend on strategically important rare earth elements, and rely on a multicomponent approach, which produces sub-optimal quality white light. Here, we report the design and preparation of a colloidal white-light emitting nanocrystal conjugate. This conjugate is obtained by linking colloidal Ga2O3 and II–VI nanocrystals in the solution phase with a short bifunctional organic molecule (thioglycolic acid). The two types of nanocrystals are electronically coupled by Förster resonance energy transfer owing to the short separation between Ga2O3 (energy donor) and core/shell CdSe/CdS (energy acceptor) nanocrystals, and the spectral overlap between the photoluminescence of the donor and the absorption of the acceptor. Using steady state and time-resolved photoluminescence spectroscopies, we quantified the contribution of the energy transfer to the photoluminescence spectral power distribution and the corresponding chromaticity of this nanocrystal conjugate. Quantitative understanding of this new system allows for tuning of the emission color and the design of quasi-single white light emitting inorganic phosphors without the use of rare-earth elements. View Full-Text
Keywords: Förster resonance energy transfer; colloidal nanocrystals; white light; photoluminescence spectroscopy; donor; acceptor; gallium oxide; II–VI semiconductor; time-resolved photoluminescence spectroscopy Förster resonance energy transfer; colloidal nanocrystals; white light; photoluminescence spectroscopy; donor; acceptor; gallium oxide; II–VI semiconductor; time-resolved photoluminescence spectroscopy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Stanish, P.C.; Radovanovic, P.V. Energy Transfer between Conjugated Colloidal Ga2O3 and CdSe/CdS Core/Shell Nanocrystals for White Light Emitting Applications. Nanomaterials 2016, 6, 32.

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