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Electroluminescence Devices with CdS and CdS:Mn Nanoparticles and Polymer Blends

Published online by Cambridge University Press:  21 February 2011

Ch. Brugger ,
S. Tasch ,
M. Lal ,
P.N. Prasad  and
G. Leising
Ch. Brugger
Affiliation:
Institut fuer Festkoerperphysik, Technische Universitaet Graz, Austria
S. Tasch
Affiliation:
Institut fuer Festkoerperphysik, Technische Universitaet Graz, Austria
M. Lal
Affiliation:
Photonics Research Laboratory, State University of New York at Buffalo, Buffalo, NY
P.N. Prasad
Affiliation:
Photonics Research Laboratory, State University of New York at Buffalo, Buffalo, NY
G. Leising
Affiliation:
Institut fuer Festkoerperphysik, Technische Universitaet Graz, Austria
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Abstract

We have investigated the photophysical properties of surface capped CdS and CdS:Mn nanoparticles in the form of spin coated thin films of the pure nanoparticles and nanoparticle -polymer blends. The organic capping reagent was p-thiocresol. Electroluminescence (EL) devices were fabricated and characterized by their current/voltage characteristics and EL emission performance. This is to our knowledge the first report on Mn doped CdS nanoparticles applied in EL devices with a single layer device structure (ITO/CdS:Mn/Al). Photoluminescence (PL) and PL excitation measurements were performed on CdS:Mn nanoparticles in pyridine dispersion and on thin films. The PL excitation spectrum shows a narrow peak at 390nm. Excitation at this wavelength yields a broad PL spectrum spanning from about 450 to 700nm, which is dominated by a strong emission band at 585nm. This emission is attributed to transitions involving Mn levels in previous works. The EL emission peak is shifted to the red compared to the PL emission spectra. The characteristics and performance of these new types of EL devices will be presented and discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 581: Symposium F – Nanophase & Nanocomposite Materials II , 1999 , 405
Copyright
Copyright © Materials Research Society 2000

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References

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