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Thermally activated delayed fluorescent phenothiazine-dibenzo[ a , j ]phenazine-phenothiazine triads exhibiting tricolor-changing mechanochromic luminescence

Okazaki, Masato ; Takeda, Youhei ; Data, Przemyslaw ; Pander, Piotr ; Higginbotham, Heather ; Monkman, Andrew P ; Minakata, Satoshi

Chemical science (Cambridge), 2017-04, Vol.8 (4), p.2677-2686 [Periódico revisado por pares]

England

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  • Título:
    Thermally activated delayed fluorescent phenothiazine-dibenzo[ a , j ]phenazine-phenothiazine triads exhibiting tricolor-changing mechanochromic luminescence
  • Autor: Okazaki, Masato ; Takeda, Youhei ; Data, Przemyslaw ; Pander, Piotr ; Higginbotham, Heather ; Monkman, Andrew P ; Minakata, Satoshi
  • Assuntos: Devices ; Emitters ; Fluorescence ; Mathematical analysis ; Mechanoluminescence ; Organic light emitting diodes ; X ray diffraction
  • É parte de: Chemical science (Cambridge), 2017-04, Vol.8 (4), p.2677-2686
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Novel U-shaped donor-acceptor-donor (D-A-D) π-conjugated multi-functional molecules comprising dibenzo[ , ]phenazine (DBPHZ) as an acceptor and phenothiazines (PTZ) as donors have been developed. Most importantly, the D-A-D compounds exhibit not only distinct tricolor-changeable mechanochromic luminescence (MCL) properties but also efficient thermally activated delayed fluorescence (TADF). Quantum chemical calculations, X-ray diffraction analysis, and systematic studies on the photophysical properties indicated that the "two-conformation-switchable" PTZ units play a highly important role in achieving multi-color-changing MCL. Time-resolved photophysical measurements revealed that the developed D-A-D compounds also exhibit efficient orange-TADF. Furthermore, organic light-emitting diode (OLED) devices fabricated with the new TADF emitters have achieved high external quantum efficiencies (EQEs) up to 16.8%, which significantly exceeds the theoretical maximum (∼5%) of conventional fluorescent emitters.
  • Editor: England
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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