A new 2:1 donor (D):acceptor (A) mixed-stacked charge-transfer (CT) cocrystal comprising isometrically structured dicyanodistyrylbenzene-based D and A molecules is designed and synthesized. Uniform 2D-type morphology is manifested by the exquisite interplay of intermolecular interactions. In addition to its appealing structural features, unique optoelectronic properties are unveiled. Exceptionally high photoluminescence quantum yield (Φ ≈ 60%) is realized by non-negligible oscillator strength of the S transition, and rigidified 2D-type structure. Moreover, this luminescent 2D-type CT crystal exhibits balanced ambipolar transport (µ and µ of ≈10 cm V s ). As a consequence of such unique optoelectronic characteristics, the first CT electroluminescence is demonstrated in a single active-layered organic light-emitting transistor (OLET) device. The external quantum efficiency of this OLET is as high as 1.5% to suggest a promising potential of luminescent mixed-stacked CT cocrystals in OLET applications.

The formation of SAMs on oxides and semiconductor surfaces has become a significant issue recently in its various technological applications. We report an easy and convenient method for the tailoring of an ITO surface with an amine functional group. A dense self-assembled monolayer of 1,12-diaminododecane was formed on the ITO surface. The long alkyl chain amine was observed for the first time to form a stable self-assembled monolayer. The amine group in diaminododecane was found to have good affinity for the ITO material. The diamine functionality of diaminododecane was utilized for the preparation of another layer of heteropolyacid on the SAM/ITO surface.

The non-radiative decay of substituted dicyano-distyrylbenzenes in solution increase with the Franck–Condon energy, being opposite to the conventional energy gap law.