Organic Light-Emitting Diodes: Investigating Morphology and Stability of Fac-tris (2-phenylpyridyl)iridium(III) Films for OLEDs (Adv. Funct. Mater. 12/2011)

Authors

  • Arthur R. G. Smith,

    1. Centre for Organic Photonics and Electronics, The University of Queensland, Brisbane, QLD 4072, Australia
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  • Jeremy L. Ruggles,

    1. School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia
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  • Hamish Cavaye,

    1. Centre for Organic Photonics and Electronics, The University of Queensland, Brisbane, QLD 4072, Australia
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  • Paul E. Shaw,

    1. Centre for Organic Photonics and Electronics, The University of Queensland, Brisbane, QLD 4072, Australia
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  • Tamim A. Darwish,

    1. Bragg Institute, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia
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  • Michael James,

    1. Bragg Institute, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia
    2. School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
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  • Ian R. Gentle,

    Corresponding author
    1. School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia
    • School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia.
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  • Paul L. Burn

    Corresponding author
    1. Centre for Organic Photonics and Electronics, The University of Queensland, Brisbane, QLD 4072, Australia
    • Centre for Organic Photonics and Electronics, The University of Queensland, Brisbane, QLD 4072, Australia
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Abstract

original image

Stable film morphology is critical for durable, high-performance organic light-emitting diodes. On page 2225, Ian R. Gentle, Paul L. Burn, and co-workers use neutron reflectometry to study the out-of-plane structure of blended thin films and multilayer structures. Uniformly blended films of fac-tris(2-phenylpyridyl)iridium(III) [Ir(ppy)3] in 4,4'-bis(N-carbazolyl)biphenyl (CBP) can be formed by evaporation, while 6 wt% films of Ir(ppy)3 in CBP, typically used in OLEDs, were found to phase-separate with moderate heating. Luminescence microscopy shows that phase separation leads to fiber-like structures of CBP (blue) and Ir(ppy)3 (green).

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