DOI: https://doi.org/10.29363/nanoge.inform.2019.053
Publication date: 8th January 2019
In the last few years co-crystals of conjugated organic compounds have attracted much attention as next-generation composite materials for organic optoelectronics. The vivid interest is driven by targeted materials design concepts inter alia via the isometric approach,1 creating segregated or mixed-stacked co-crystal systems. Reversible segregated-mixed stack conversion can be induced by external multi-stimuli, generating large color changes by switching between localized exciton vs. charge-transfer (CT) emission.2 Combined pump-probe, low-temperature PL and atomistic quantum-chemical studies reveal the spectral signatures and kinetics of exciton generation, transport and deactivation.3,5 Switching from 1D to 2D mixed-stacking motif gives rise to well-balanced ambipolar charge transport materials, being a prerequisite for optimized electrically driven light emission, and allowing for the first CT-crystal-based organic light emitting transistors (OLET).4 Systematic opening new pathways in the field. Targeted crystal design allows for systematic color variation and intermolecular TADF characteristics while keeping the structural characteristics.5
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