Photophysics of Deep Blue Acridane- and Benzonitrile-Based Emitter Employing Thermally Activated Delayed Fluorescence

We designed and synthesized a new organic light-emitting diode (OLED) emitter, SBABz4, containing spiro-biacridine donor (D) in the core surrounded by two benzonitrile acceptors (A). The dual A–DxD–A structure is shown to provide pure-blue emission in relation to its single A–D counterpart. Time-res...

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Published inJournal of physical chemistry. C Vol. 122; no. 39; pp. 22796 - 22801
Main Authors Drigo, Nikita A, Kudriashova, Liudmila G, Weissenseel, Sebastian, Sperlich, Andreas, Huckaba, Aron Joel, Nazeeruddin, Mohammad Khaja, Dyakonov, Vladimir
Format Journal Article
LanguageEnglish
Published American Chemical Society 04.10.2018
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Abstract We designed and synthesized a new organic light-emitting diode (OLED) emitter, SBABz4, containing spiro-biacridine donor (D) in the core surrounded by two benzonitrile acceptors (A). The dual A–DxD–A structure is shown to provide pure-blue emission in relation to its single A–D counterpart. Time-resolved photoluminescence (TRPL) recorded in the broad dynamic range from solutions and solid films revealed three emission components: prompt fluorescence, phosphorescence, and efficient thermally activated delayed fluorescence (TADF). The last is independently proven by temperature-dependent TRPL and oxygen-quenching PL experiment. From the PL lifetimes and quantum yield, we estimated maximum external quantum efficiency of 7.1% in SBABz4-based OLEDs and demonstrated 6.8% in a working device.
AbstractList We designed and synthesized a new organic light-emitting diode (OLED) emitter, SBABz4, containing spiro-biacridine donor (D) in the core surrounded by two benzonitrile acceptors (A). The dual A–DxD–A structure is shown to provide pure-blue emission in relation to its single A–D counterpart. Time-resolved photoluminescence (TRPL) recorded in the broad dynamic range from solutions and solid films revealed three emission components: prompt fluorescence, phosphorescence, and efficient thermally activated delayed fluorescence (TADF). The last is independently proven by temperature-dependent TRPL and oxygen-quenching PL experiment. From the PL lifetimes and quantum yield, we estimated maximum external quantum efficiency of 7.1% in SBABz4-based OLEDs and demonstrated 6.8% in a working device.
Author Sperlich, Andreas
Drigo, Nikita A
Huckaba, Aron Joel
Nazeeruddin, Mohammad Khaja
Dyakonov, Vladimir
Kudriashova, Liudmila G
Weissenseel, Sebastian
AuthorAffiliation École Polytechnique Fédérale de Lausanne (EPFL)
Bavarian Center for Applied Energy Research (ZAE Bayern)
Group for Molecular Engineering of Functional Materials
Experimental Physics 6
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Title Photophysics of Deep Blue Acridane- and Benzonitrile-Based Emitter Employing Thermally Activated Delayed Fluorescence
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