Supramolecular Network Conducting the Formation of Uniaxially Oriented Molecular Crystal of Cyano Substituted Oligo(p-phenylene vinylene) and Its Amplified Spontaneous Emission (ASE) Behavior

Abstract

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.

Molecular crystals based on 9,10-distyrylanthracene derivatives with high solid state fluorescence efficiency and uniaxial orientation induced by supramolecular interactions

“…The torsional angles of the double bonds   (2,3,4,5) is 179.9° in the CNDSA crystal and 179.3° in the t-BUDSA (Table 2), larger than that of DSA (172.2°), resulting in relatively less twisted molecular structure. The torsional angles   (1,2,3,4) of CNDSA and t-BUDSA are 54.4° and 60.7°, larger than that of DSA (4.6°) and   (3,4,5,6) between the double bonds and the adjacent phenyl ring are 20.6° for CNDSA and 4.6° for t-BUDSA, smaller than that of DSA (75.0°) due to the effect of internal steric hindrance between the vinylene moieties and the substituents moieties (CN and t-BU). The analyses demonstrate that the two compounds have nonplanar conformation in their crystals.…”

“…Organic single crystals increasingly highlight their positions in material science and have attracted extensive attention [1][2][3] due to their unique properties, such as high thermostability and charge transport ability, low light propagation loss and reflecting mirror structure [4]. So they are prospectively applied in optical waveguides [5], solid-state laser [6], and many other high-tech areas [7,8].…”

“…As usual, molecular packing models can affect the fluorescence properties of organic crystals, as well as their practical applications. Among the packing models, uniaxially oriented packing is the most conductive to crystal optical properties, which is beneficial to the light propagation and stimulated emission due to the emission from the same orientation single molecules [4] During the last decade, only few works have reported on the uniaxially oriented molecular crystals [9], because it is difficult to make the organic molecules packing in the same orientation due to the multiple conformation of organic molecules and the various interactions in the crystals [4]. Curtis and co-workers [9] reported two -stack molecular crystals of alkyl bithiazole oligomers and the influence of intermolecular (-) interactions on the spectra of conjugated molecules in the solid state.…”

“…Curtis and co-workers [9] reported two -stack molecular crystals of alkyl bithiazole oligomers and the influence of intermolecular (-) interactions on the spectra of conjugated molecules in the solid state. Ma and co-workers [4] reported a uniaxially oriented molecular crystal of cyano substituted oligo(p-phenyl enevinylene) (CNDPASDB) and its photophysical properties. Yan and co-workers [10] reported the uniaxially oriented crystals based on peptide.…”

Low Optical Loss Amplified Spontaneous Emission and Lasing in a Solution‐Processed Organic Semiconductor

“…Early in 1996, solid‐state organic lasing has been successfully demonstrated by Hide et al from an optically pumped thin‐film waveguide of MEH–PPV/polystyrene film, while Tessler et al made the first vertical microcavity laser based on conjugated polymers as gain materials. Subsequently, optically pumped lasers has been demonstrated in a broad range of conjugated polymers, oligomers, and evaporated small molecular films . Most recently, low threshold lasing under quasi continuous‐wave photoexcitation was reported by Adachi and coworkers Despite success in optically pumped lasing, the electrically pumped “injection laser” remains as a significant challenge.…”