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Carbazole-Derived Group of Uniform Materials Based on Organic Salts: Solid State Fluorescent Analogues of Ionic Liquids for Potential Applications in Organic-Based Blue Light-Emitting Diodes
journal contribution
posted on 2014-02-06, 00:00 authored by Noureen Siraj, Farhana Hasan, Susmita Das, Lucy W. Kiruri, Karen
E. Steege Gall, Gary A. Baker, Isiah M. WarnerIn this study, we report synthesis
and characterization of novel
carbazole-based group of uniform materials based on organic salts
(GUMBOS), as well as potential applications of these compounds. These
organic-based compounds exhibit high thermal stability (decomposition
temperatures in the range of 395–432 °C) and photostability.
In addition, these compounds have appreciably high fluorescence quantum
yields (73–99%) with broad emissions in the visible region
and quantum yields which depend on the GUMBOS counteranion. The physicochemical,
optical, and electrochemical properties of these materials are investigated
and detailed here. Evaluation of band gap values (3.4 eV), HOMO–LUMO
energy levels, and measured fluorescence quantum yields as compared
to carbazole suggest potential use in organic light-emitting diodes.
Computational results are found to be complementary to experimental
results, and calculated band gaps are in agreement with experimentally
obtain values.