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Nonlinear Optical and Transport Properties of Fullerene Crystals

Published online by Cambridge University Press:  15 February 2011

Hugh J. Byrne ,
Lidia Akselrod ,
Andreas T. Werner ,
Wolfgang K. Maser ,
Mathias Kaiser ,
Wolfgang W. RÜhle  and
Siegmar Roth
Hugh J. Byrne
Affiliation:
Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569-Stuttgart, Germany
Lidia Akselrod
Affiliation:
Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569-Stuttgart, Germany
Andreas T. Werner
Affiliation:
Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569-Stuttgart, Germany
Wolfgang K. Maser
Affiliation:
Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569-Stuttgart, Germany
Mathias Kaiser
Affiliation:
Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569-Stuttgart, Germany
Wolfgang W. RÜhle
Affiliation:
Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569-Stuttgart, Germany
Siegmar Roth
Affiliation:
Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569-Stuttgart, Germany
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Abstract

Picosecond time resolved photoluminescence and photoconductivity measurements are performed to investigate the influence of high intensity illumination on the properties of Fullerene crystals. A highly nonlinear dependence of both the photoluminescence characteristics and the photoconductive response of the fullerenes is seen and temperature dependent measurements indicate that the nonlinear processes are associated with an insulatormetal-like phase transition in the material, and thus that the electronic properties of the excited state are dramatically altered at high excited state densities. The observed behaviour is compared and contrasted to the changes in the optical properties upon photochemical modification of the pristine material via Raman spectroscopy. Application of a simple phenomenological model to calculate the contribution of intermolecular exchange and correlation energies in the excited state supports the proposal that the observed phenomena originate from a Mott-like phase transition. A further manifestation of this behaviour is the emergence of a broadband electroluminescent emission above a critical injection current density.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 359: Symposium G – Science and Technology of Fullerene Materials , 1994 , 451
Copyright
Copyright © Materials Research Society 1995

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References

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