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    Chemical Stabilities of the Lowest Triplet State in Aryl Sulfones and Aryl Phosphine Oxides Relevant to OLED Applications

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    Type
    Article
    Authors
    Li, Huifang
    Hong, Minki cc
    Scarpaci, Annabelle
    He, Xuyang
    Risko, Chad
    Sears, John S.
    Barlow, Stephen
    Winget, Paul
    Marder, Seth R.
    Kim, Dongwook
    Bredas, Jean-Luc cc
    KAUST Department
    KAUST Solar Center (KSC)
    Laboratory for Computational and Theoretical Chemistry of Advanced Materials
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2019-02-14
    Online Publication Date
    2019-02-14
    Print Publication Date
    2019-03-12
    Permanent link to this record
    http://hdl.handle.net/10754/631111
    
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    Abstract
    Aryl sulfones and phosphine oxides are widely used as molecular building blocks for host materials in the emissive layers of organic light-emitting diodes. In this context, the chemical stability of such molecules in the triplet state is of paramount concern to long-term device performance. Here, we explore the triplet excited-state (T1) chemical stabilities of aryl sulfonyl and aryl phosphoryl molecules by means of UV absorption spectroscopy and density functional theory calculations. Both the sulfur–carbon bonds of the aryl sulfonyl molecules and the phosphorus–carbon bonds of aryl phosphoryl derivatives are significantly more vulnerable to dissociation in the T1 state when compared to the ground (S0) state. Although the vertical S0→T1 transitions correspond to non-bonding→π-orbital transitions, geometry relaxations in the T1 state lead to -* character over the respective sulfur–carbon or phosphorus–carbon bond, a result of significant electronic state mixing, which facilitates bond dissociation. Both the activation energy for bond dissociation and the bond dissociation energy in the T1 state are found to vary linearly with the adiabatic T1-state energy. Specifically as T1 becomes more energetically stable, the activation energy becomes larger, and dissociation becomes less likely, i.e., more endothermic or less exothermic. While substitutions of electron-donating or accepting units onto the aryl sulfones and aryl phosphine oxides have only marginal influence on the dissociation reactions, extension of the -conjugation of the aryl groups leads to a significant reduction in the triplet energy and a considerable enhancement in the T1-state chemical stabilities.
    Citation
    Li H, Hong M, Scarpaci A, He X, Risko C, et al. (2019) Chemical Stabilities of the Lowest Triplet State in Aryl Sulfones and Aryl Phosphine Oxides Relevant to OLED Applications. Chemistry of Materials. Available: http://dx.doi.org/10.1021/acs.chemmater.8b04235.
    Sponsors
    We thank Solvay SA, the National Natural Science Foundation of China (21403037), and the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science, and Technology (2015R1D1A1A01061487) for support. We thank Jean-Pierre Catinat and Véronique Mathieu (Solvay) for measuring the phosphorescence spectrum of PPTSO.
    Publisher
    American Chemical Society (ACS)
    Journal
    Chemistry of Materials
    DOI
    10.1021/acs.chemmater.8b04235
    Additional Links
    https://pubs.acs.org/doi/10.1021/acs.chemmater.8b04235
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.chemmater.8b04235
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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