Highly Luminescent 2D-Type Slab Crystals Based on a Molecular Charge-Transfer Complex as Promising Organic Light-Emitting Transistor Materials.
basic_science · Level V
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- Record sourced from PubMed, PMID 28745406.
- Also identified by DOI 10.1002/adma.201701346.
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Abstract
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<sub>F</sub> ≈ 60%) is realized by non-negligible oscillator strength of the S<sub>1</sub> transition, and rigidified 2D-type structure. Moreover, this luminescent 2D-type CT crystal exhibits balanced ambipolar transport (µ<sub>h</sub> and µ<sub>e</sub> of ≈10<sup>-4</sup> cm<sup>2</sup> V<sup>-1</sup> s<sup>-1</sup> ). 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.