| Autor: |
Izumi, Saika, Higginbotham, Heather F., Nyga, Aleksandra, Stachelek, Patrycja, Tohnai, Norimitsu, Silva, Piotr de, Data, Przemyslaw, Takeda, Youhei, Minakata, Satoshi |
| Zdroj: |
Journal of the American Chemical Society; January 2020, Vol. 142 Issue: 3 p1482-1491, 10p |
| Abstrakt: |
A new class of thermally activated delayed fluorescent donor–acceptor–donor–acceptor (D–A–D–A) π-conjugated macrocycle comprised of two U-shaped electron-acceptors (dibenzo[a,j]phenazine) and two electron-donors (N,N′-diphenyl-p-phenyelendiamine) has been rationally designed and successfully synthesized. The macrocyclic compound displayed polymorphs-dependent conformations and emission properties. Comparative studies on physicochemical properties of the macrocycle with a linear surrogate have revealed significant effects of the structural cyclization of the D–A-repeating unit, including more efficient thermally activated delayed fluorescence (TADF). Furthermore, an organic light-emitting diode (OLED) device fabricated with the macrocycle compound as the emitter has achieved a high external quantum efficiency (EQE) up to 11.6%, far exceeding the theoretical maximum (5%) of conventional fluorescent emitters and that with linear analogue (6.9%). |
| Databáze: |
Supplemental Index |
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