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Size Dependent Electroluminescence from CdSe Nanocrystallites (Quantum Dots)

Published online by Cambridge University Press:  28 February 2011

B.O. Dabbousi ,
O. Onitsuka ,
M.F. Rubner  and
M.G. Bawendi
B.O. Dabbousi
Affiliation:
MIT, Department of Chemistry, Cambridge, MA 02139
O. Onitsuka
Affiliation:
MIT, Department of Materials Science and Engineering, Cambridge, MA 02139
M.F. Rubner
Affiliation:
MIT, Department of Materials Science and Engineering, Cambridge, MA 02139
M.G. Bawendi
Affiliation:
MIT, Department of Chemistry, Cambridge, MA 02139
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Abstract

We obtain spectrally narrow (FWHM < 40 nm) electroluminescence from nearly monodisperse CdSe nanocrystallites (quantum dots) incorporated into thin films of polyvinyl carbazole (PVK) and an oxadiazole derivative (PBD) sandwiched between aluminum and ITO electrodes. The electroluminescence and photoluminescence spectra are nearly identical at room temperature and are tunable from ∼530 nm to ∼650 nm by varying the size of the dots. Voltage studies at 77K indicate that while only the dots electroluminesce at the lower voltages, both the dots and the PVK matrix electroluminesce at higher applied voltages. Variable temperature studies indicate that the electroluminescence efficiency increases substantially as the films are cooled down to cryogenic temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 358: Symposium F – Microcrystalline and Nanocrystalline Semiconductors , 1994 , 707
Copyright
Copyright © Materials Research Society 1995

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References

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