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Strong Photoluminescence in the Near-Infrared from Colloidally-Prepared HgTe Nanocrystals

Published online by Cambridge University Press:  09 August 2011

M. T. Harrison ,
S. V. Kershaw ,
M. G. Burt ,
A. L. Rogach ,
A. Kornowski ,
A. Eychmüller  and
H. Weller
M. T. Harrison
Affiliation:
BT Laboratories, Martlesham Heath, Ipswich, Suffolk, IP5 3RE, UK
S. V. Kershaw
Affiliation:
BT Laboratories, Martlesham Heath, Ipswich, Suffolk, IP5 3RE, UK
M. G. Burt
Affiliation:
BT Laboratories, Martlesham Heath, Ipswich, Suffolk, IP5 3RE, UK
A. L. Rogach
Affiliation:
Institut für Physikalische Chemie, Universität Hamburg, 20146 Hamburg, Germany.
A. Kornowski
Affiliation:
Institut für Physikalische Chemie, Universität Hamburg, 20146 Hamburg, Germany.
A. Eychmüller
Affiliation:
Institut für Physikalische Chemie, Universität Hamburg, 20146 Hamburg, Germany.
H. Weller
Affiliation:
Institut für Physikalische Chemie, Universität Hamburg, 20146 Hamburg, Germany.
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Abstract

We report here the first measurement of strong near-infrared room temperature photoluminescence (PL) from colloidally-prepared HgTe nanocrystals. X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM) measurements indicate that the nanoparticles are in the cubic coloradoite phase, with a diameter of approximately 4 nm. The absorption spectrum shows a pronounced electronic transition in the near-infrared, and the broad PL appears to consist of several overlapping features between 800 and 1400 nm with a peak at 1080 nm, which represent a dramatic shift from bulk HgTe behaviour. The quantum efficiency (QE) of the freshly prepared sample is around 50%, which is among the highest ever reported for a nanocrystalline material. Over a period of several days, the luminescence shifts further into the infrared yielding more dominant longer wavelength features. The observation of this strong infrared luminescence makes this material a promising candidate for application in optical telecommunication systems.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 536: Symposium F – Microcrystalline & Nanocrystalline Semiconductors - 1998 , 1998 , 217
Copyright
Copyright © Materials Research Society 1999

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