Authors: Martin, C; Borreguero, C; Kennes, K; Van der Auweraer, M; Hofkens, J; de Miguel, G; Garcia-Frutos, EM

J. Mater. Chem. C. vol: 7. page: 2050-7526.
Date: feb-07. 2019.
Doi: 10.1039/c8tc05476b.

In this paper, a new D-A bipolar luminescent azaindole is synthesized and fully characterized. The triphenylamine (TPA) derivative acting as a hole-transporting unit (D) and 2-cyanoacrylic acid acting as an electron-transporting unit (A) are incorporated in the same molecule. This luminogen, based on azaindole, presents aggregation-induced emission (AIE) characteristics. The theoretical calculations together with the photophysical characterization show the potential applicability of this new compound as electroluminescent material for non-doped OLEDs. A double-layer light-emitting device was developed showing that the presence of a better acceptor group in the azaindole derivative can reduce the electroplex and electromer formation in favor of the electron-hole recombination in the HOMO-LUMO of the molecule. These results pointed out the importance of the molecular design of the emissive material for a better OLED performance..