One-pot aqueous synthesis of high quality near infrared emitting Cd1−xHgxTe nanocrystals

Vladimir Lesnyak; Andrey Lutich; Nikolai Gaponik; Markus Grabolle; Alexei Plotnikov; Ute Resch-Genger; Alexander Eychmüller

doi:10.1039/B913200G

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One-pot aqueous synthesis of high quality near infrared emitting Cd_1−xHg_xTe nanocrystals†

Vladimir Lesnyak,^a Andrey Lutich,^b Nikolai Gaponik,^a Markus Grabolle,^c Alexei Plotnikov,^d Ute Resch-Genger^c and Alexander Eychmüller*^a

Author affiliations

* Corresponding authors

^a Physical Chemistry, TU Dresden, Bergstr. 66b, Dresden, Germany
E-mail: alexander.eychmueller@chemie.tu-dresden.de
Fax: +49(0)35146337164
Tel: +49(0)35146334331

^b Photonics and Optoelectronics Group, Department of Physics and CeNS, Ludwig-Maximilians-Universität München, Amalienstr. 54, Munich, Germany

^c BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Str. 11, Berlin, Germany

^d Helmholtz Center Berlin for Materials and Energy, Glienicker Str. 100, Berlin, Germany

Abstract

An efficient one-pot aqueous synthesis of alloyed Cd_1−xHg_xTe nanocrystals (NCs) is realized and the influence of the experimental conditions and of the initial composition of the NCs on their optical properties is discussed. This approach obtains stable NCs with an emission tunable in the red and the near infrared (NIR) spectral regions ranging from 640 to 1600 nm thereby covering the second and third telecommunication windows. The high photoluminescence quantum efficiency (PL QE) of these colloids with values up to 55% for red emitting, and up to 60% for NIR emitting samples is indicative of the excellent quality of the NCs.

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Supplementary files

PL spectra of a series of size-selected fractions of Cd0.95Hg0.05Te/TGA NCs, transmission spectrum of benzyl alcohol, PL and absorption spectra of IR 26 in benzyl alcohol PDF (361K)

Article information

DOI: https://doi.org/10.1039/B913200G
Article type: Paper
Submitted: 03 Jul 2009
Accepted: 28 Sep 2009
First published: 23 Oct 2009

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J. Mater. Chem., 2009,19, 9147-9152

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One-pot aqueous synthesis of high quality near infrared emitting Cd_1−xHg_xTe nanocrystals

V. Lesnyak, A. Lutich, N. Gaponik, M. Grabolle, A. Plotnikov, U. Resch-Genger and A. Eychmüller, J. Mater. Chem., 2009, 19, 9147 DOI: 10.1039/B913200G

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Journal of Materials Chemistry