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Singlet energy transfer and singlet-singlet annihilation in light-emitting blends of organic semiconductors

Appl. Phys. Lett. 95, 183305 (2009); doi:10.1063/1.3253422

Published 3 November 2009

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A. Ruseckas,1 J. C. Ribierre,1 P. E. Shaw,1 S. V. Staton,2 P. L. Burn,3 and I. D. W. Samuel1
1Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St Andrews, St. Andrews KY16 9SS, United Kingdom
2Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, United Kingdom
3Centre for Organic Photonics and Electronics, University of Queensland, Chemistry Building, Queensland 4072, Australia
Excitation energy transfer from host to guest is studied in spin-cast blends of 4,4[prime]-bis(N-carbazolyl)biphenyl (CBP) and a phosphorescent fac-tris(2-phenylpyridyl)iridium(III)-cored dendrimer using time resolved fluorescence. The kinetics of energy transfer are consistent with homogeneous dispersion of the dendrimers in the CBP host. Diffusion-controlled singlet-singlet exciton annihilation is observed in the CBP host at moderate excitation densities, similar to those encountered in high brightness light-emitting devices and organic lasers. The results are important for organic lighting and the understanding of exciton diffusion in guest-host systems for electrophosphorescence. ©2009 American Institute of Physics
History: Received 27 May 2009; accepted 11 September 2009; published 3 November 2009
Permalink: http://link.aip.org/link/?APPLAB/95/183305/1
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KEYWORDS and PACS

Keywords
PACS
  • 71.35.-y
    Excitons and related phenomena
  • 66.30.H-
    Self-diffusion and ionic conduction in solid nonmetals
  • 78.55.Kz
    Photoluminescence in solid organic materials
  • 78.47.Cd
    Time-resolved luminescence in condensed matter
  • 85.60.Jb
    Light-emitting devices
  • YEAR: 2009

PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
Publisher:
AIP is a member of CrossRef AIP

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