Through adding two substituent phenyl groups on distyrylbenzene, we have obtained the cross stacking of 2,5-diphenyl-1,4-distyrylbenzene with two trans double bonds (trans-DPDSB) in crystalline state. In such a cross-stacking mode, the solid-state emission exhibits high-intensity, having characteristics similar to its single molecule. The organic light-emiiting diodes (OLEDs) with attractive performance have been achieved using trans-DPDSB as a light-emitting layer, and the amplified spontaneous emission of the needlelike crystals has been observed.

Strong supramolecular interactions, which induced tight packing and rigid molecules in crystals of cyano substituent oligo(para-phenylene vinylene) (CN-DPDSB), are the key factor for the high luminescence efficiency of its crystals; opposite to its isolated molecules in solution which have very low luminescence efficiency.

Restricted by the energy gap rule, near-infrared (NIR) luminescent materials face great challenges. Here, we report a newly designed and synthesized organic molecule, 5,5′-([1,2,5]­thiadiazolo­[3,4-c]­pyridine-4,7-diyl)­bis­(N,N-diphenylthiophen-2-amine) (DTPS-PT), which has strong donor and acceptor interactions for NIR emission applications. The results demonstrate that the higher planarity of the DTPS-PT molecular structure enhances the pi-conjugation and hybridization between the charge transfer state (CT) and localized pi states (LE). As a result, DTPS-PT exhibits NIR emissions from an LE involved in hybridized local and charge transfer (HLCT) states, showing a 79% high fluorescence quantum yield in the low polar solvent tetrachloromethane. For both doped and nondoped devices, the NIR OLEDs based on DTPS-PT achieved “real” NIR emission with the λonset above 700 nm. The best performing OLED device within the doped devices gave a maximum emission peak around 840 nm with a maximum radiance of 2202 mW Sr–1 m–2.

Deep-blue electroluminescence with a maximum EQE of 5.74% and CIEy ∼ 0.05 is achieved based on a newly designed D–π–A fluorophore with a HLCT excited state.

The supramolecular interactions are of importance for inducing the molecular orientation and constructing functional materials with high performance. In this manuscript we report uniaxially oriented molecular crystal of a cyano substituted oligo(p-phenylene vinylene) 1,4-bis(R-cyano-4-diphenylaminostyryl)-2,5diphenylbenzene (CNDPASDB) with high luminescence under the driving force of the three-dimensional supramolecular interaction networks. Amplified spontaneous emission (ASE) with a low threshold value of 30.5 kW/cm 2 was observed from a high-quality slab-like CNDPASDB crystal and verified by the variable pump stripe method. The net gain coefficient with 55 cm -1 is also measured. The tip of CNDPASDB crystal exhibits polarized self-waveguided emission due to the propagation of polarized light emitted from the uniaxially oriented CNDPASDB molecules along crystal surface.