![]() Twisting a PAH out of planarity adds up newer properties such as increasing triplet yields by increasing inter-system crossing (ISC), localizing electron density at the central benzene ring, and increasing the Cotton effect and dissymmetry factors in cases of both absorption ( g abs) and emission ( g lum). In multi-peri-substituted acenes, twisting of the core could result in appreciable tuning in the optoelectronic and chiroptical properties. explored the structural aspects of twisted acenes (twistacenes) extensively, in which the highly substituted acene core exhibited deviation from its planarity. While the exquisite properties of the acenes are anticipated for their flat, rigid π-conjugated backbones with reasonably low HOMO-LUMO gaps, the discussion on the possible existence of a core-twisted acene backbone in the solid state (arising from the steric factor in multi-peri-substituted acenes) is often understated. The widespread applications of PAHs include organic thin film transistors (OTFTs), organic light-emitting diodes (OLEDs), perovskite solar cells, third-generation photovoltaics or singlet-fission materials, TADF emitters, etc. Polycyclic aromatic hydrocarbons (PAHs) in the field of organic electronics are considered the Holy Grail because of their tunable optoelectronic properties resulting from their unique structure, mechanical flexibility, solution processability, etc.
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