• Login
    View Item 
    •   YODA Home
    • CSEM Archive
    • Research Publications
    • View Item
    •   YODA Home
    • CSEM Archive
    • Research Publications
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Spectrally resolved thermoluminescence versus electroluminescence spectra of PVK doped with 1 wt % of Ir(btp)(2)(acac)

    Thumbnail
    Author
    Glowacki, I.; Szamel, Z.; Wiosna-Salyga, G.
    Metadata
    Show full item record
    Abstract
    Spectrally resolved thermoluminescence (SRTL) of poly(N-vinylcarbazole) (PVK) doped with 1 wt% of bis [2-(2''-benzothienyl)pyridinato-N,C-3''](acetylacetonate) iridium (Ir(btp)(2)(acac)) is studied and compared with electroluminescence and photoluminescence results. Monochromatic thermoluminescence (TL) curves registered in the temperature range 15-320 K indicate that besides trapping sites localised on the PVK matrix, deep traps on Ir(btp)(2)(acac) molecules play a very important role. The SRTL experiments provide evidence that the dopant molecules act as emission centres which effectively compete with other radiative recombination centres present in PVK matrix. The SRTL spectra are compared with electroluminescence spectra of the single layer polymer light emitting diodes based on the same compounds. From the comparison of the SRTL and EL spectra results one can notice that the same radiative recombination mechanisms occur under both optical excitation at low temperature and electrical excitation. Even at 1 wt% of the dopant molecules embedded in PVK, the emission originates almost exclusively from triplet excitons of Ir(btp)(2)(acac) molecules. The studies prove that host-guest system works very effectively in the case when the dopant molecules are not only efficient emitter but they act also as trapping sites. (c) 2016 Elsevier B.V. All rights reserved.
    Publication Reference
    Organic Electronics, vol. 31, pp. 127-135, Apr 2016.
    Year
    2016
    URI
    https://yoda.csem.ch/handle/20.500.12839/70
    Collections
    • Research Publications

    Browse

    All of YODACommunities & CollectionsBy Issue DateAuthorsTitlesResearch AreasBusiness UnitsThis CollectionBy Issue DateAuthorsTitlesResearch AreasBusiness Units

    My Account

    Login

    DSpace software copyright © 2002-2022  DuraSpace
    Contact Us | Send Feedback
    DSpace Express is a service operated by 
    Atmire NV