Metal‐free organic molecules with structurally diverse aggregation‐induced emission (AIE) behavior and new functional photophysical properties reveal unique structure–property relationships, especially bright luminescence, and have attracted extensive attention in the past few decades. Despite tremendous progress on fluorescent molecules development, the extended π‐conjugated organic AIE probes with their nanorange self‐assembly, coassembly, unique morphology, high biocompatibility, and light‐harvesting capabilities enable them as potential candidates in numerous translational application perspectives. In particular, a few important classes of AIE light up small molecules, supramolecules, oligomers, polymers, including nanoparticles and photosensitizer molecules, with their emerging properties of thermally activated delayed fluorescence, room temperature phosphorescence, including emission switching stimuli‐responsive behavior and multifunctional properties, have been boosted by the rare features of aggregation at their condensed or solid states. This review highlights salient features of AIE‐based emitters, encompassing molecular design strategies, stimulating photophysical properties, mechanistic aspects, and their efficacy in various electronic and biomedical applications, broadly covering properties of small molecules to oligomers, macromolecules to polymers.

This work reports the fabrication of an n-channel OFET device using simple perylenemonoimide (PMI) derivatives by introducing a nonconjugated long alkyl chain (octadecyl) at the imide position. To demonstrate the primary role of the long pendant chain in the generation of OFET characteristics, a series of electronically similar PMI congeners were synthesized with different alkyl chainsnamely, hexyl, 2-ethylhexyl, octyl, and octadecyl. It was observed that the insertion of the octadecyl chain can significantly manipulate the supramolecular self-assembly in PMI-C18 with very good film-forming property, suggesting the prominent role of the pendant alkyl chain length in their condensed state intermolecular interaction. Along with the good film forming property, the long octadecyl chain at the imide position significantly improves the thermal, electrochemical, and photophysical properties, which help in generating OFET characteristics in PMI-C18, whereas other congeners do not show any device properties. With poly­(methyl methacrylate) (PMMA) as the dielectric, top-contact bottom-gate n-channel OFET were fabricated on an economical glass substrate using these simple PMI derivatives. Among them, PMI-C18 demonstrates OFET properties with electron mobility (μe) of 1 × 10–4 cm2 V–1 s–1 and current on/off ratio (I on/off) of 8.8 × 102. Moreover, the threshold voltage (V th) of 4.40 V obtained for PMI-C18 was the lowest among all the reported perylene monoimide core based OFET devices. Besides, these PMI cores also demonstrated the influence of the alkyl chain on the photophysical, electronic, and electrochemical properties along with the molecular packing and charge transport behavior. Thus, such simple yet strategic synthetic manipulations in PMIs could contribute to the development of imide based materials for OFET applications.

The development of an ew naphthalene appended naphthalimide derivative (NMI)w ith aggregation-induced enhanced emission (AIEE) property for the sensitive detection of 4-nitroaniline( 4-NA) in aqueous media is presented here. The newly designed naphthalimide AIEEgen has an exceptional blue-shifted condensed state emission that is devoid of any receptor site, accomplished ultrasensitived etection of 4-NA, whichi so ne of the broad-spectrump esticides that belong to the class III toxic chemical, at parts per billion level (LOD/36 ppb, K sv = 4.1 10 4 m À1 )i nw ater with excellent selectivity even in the presence of potentially competing aliphatic anda romatic amines. The reported probe is the first of its kind, demonstrating major advantages of receptor-free inner filter effect (IFE) mechanism for the sensitive detection of 4-NA using an AIEEgenic probe.E xcellent sensitivity for 4-NA is also achieved on paper-based teststrip for low-coston-site detection.

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