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Exciton and Defect Photoluminescence Signatures in Single Crystal Rubrene

Published online by Cambridge University Press:  26 February 2011

Oleg Mitrofanov ,
David V Lang ,
Christian Kloc ,
Theo Siegrist ,
Woo-Young So ,
Michael A Sergent  and
Arthur P Ramirez
Oleg Mitrofanov
Affiliation:
[email protected], Bell Labs, Lucent Technologies, Device Physics, 600 Mountain Ave, Murray Hill, NJ, 07974, United States
David V Lang
Affiliation:
[email protected], Columbia University, New York, NY, 10027, United States
Christian Kloc
Affiliation:
[email protected], Bell Labs, Lucent Technologies, Device Physics, 600 Mountain Ave, Murray Hill, NJ, 07974, United States
Theo Siegrist
Affiliation:
[email protected], Bell Labs, Lucent Technologies, Device Physics, 600 Mountain Ave, Murray Hill, NJ, 07974, United States
Woo-Young So
Affiliation:
[email protected], Columbia University, New York, NY, 10027, United States
Michael A Sergent
Affiliation:
[email protected], Bell Labs, Lucent Technologies, Device Physics, 600 Mountain Ave, Murray Hill, NJ, 07974, United States
Arthur P Ramirez
Affiliation:
[email protected], Bell Labs, Lucent Technologies, Device Physics, 600 Mountain Ave, Murray Hill, NJ, 07974, United States
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Abstract

Radiative recombination processes provide valuable information about exciton dynamics and allow detection of defects in rubrene crystals. We demonstrate that the photoluminescence spectra of crystalline rubrene reflect exciton dissociation through oxygen-related defects in addition to the direct exciton recombination. The defect-assisted exciton dissociation results in a well-defined photoluminescence band. These defects play an important role in charge transport. Dark- and photo-conductivity is higher in rubrene crystals with a large density of the defects. The observations strongly suggest that the oxygen-related defect forms a bandgap state and acts as an acceptor center in crystalline rubrene.

Keywords

luminescenceorganicelectrical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 965: Symposium S – Organic Electronics – Materials, Devices and Applications , 2006 , 0965-S13-08
Copyright
Copyright © Materials Research Society 2007

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References

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