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Colloidal CuInSe2 Nanocrystals in the Quantum Confinement Regime: Synthesis, Optical Properties, and Electroluminescence

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† School of Materials Science and Engineering, 5 Zhongguancun South Street, Beijing Institute of Technology, Beijing 100081, China
‡ Department of Chemistry, Institute for Optical Sciences, and Centre for Quantum Information and Quantum Control, 80 St. George Street, University of Toronto, Toronto, Ontario M5S 3E4, Canada
§ Department of Materials Science and Engineering, 184 College Street, University of Toronto, Toronto, Ontario M5S 3E4, Canada
⊥ Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British Columbia V8W 3V6, Canada
E-mail: [email protected] (H.Z.); [email protected] (G.D.S.).
Cite this: J. Phys. Chem. C 2011, 115, 25, 12396–12402
Publication Date (Web):June 1, 2011
https://doi.org/10.1021/jp204249j
Copyright © 2011 American Chemical Society
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    Abstract

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    Photoluminescent, near-stoichiometric colloidal CuInSe2 nanocrystals are synthesized in large batches and with good colloidal quality. An organometallic method is used with a moderate reaction temperature (≤200 °C) to produce CuInSe2 nanocrystals with size-tunable photoluminescence spectra ranging from ∼600 to ∼850 nm. Two-dimensional photoluminescence excitation–emission maps are reported for the CuInSe2 nanocrystals, highlighting the size-tunable excitonic features. Type I heterostructured CuInSe2/ZnS nanocrystals are prepared and purified. They are found to have absolute photoluminescence quantum yields up to ∼26%. The potential to use CuInSe2/ZnS core/shell nanocrystals as a potential low toxicity active layer in light-emitting diodes is demonstrated by fabricating electroluminescent devices.

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    (1) Theoretical calculations, (2) enlarged images of CuInSe2 nanocrystals, (3) EDS analysis results, (4) UV–vis absorption spectra and STEM image, (5) evolution of UV–vis and PL spectra during CuInSe2/ZnS NCs growth, (6) EDS spectra of CuInSe2/ZnS NCs, and (7) PLE and line-narrowed PL spectra. This material is available free of charge via the Internet at http://pubs.acs.org.

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