Aggregation induced enhanced emission of diphenylamine and pyridine based conjugated organic materials

Aggregate Science: From Structures to Properties

“…For example, in 2002, Park et al reported the compound (E)-CN-MBE with a bathochromically shifted absorption and enhanced emission within the process of aggregation due to the J-aggregate formation. [108][109][110][111] A negligible fluorescence quantum yield (Φ F ) of 0.001 was measured in a pure THF solution. However, the Φ F of nanoparticles (NPs) reached 0.69, which was attributed to the synergetic effect of intramolecular planarization and J-type aggregate formation.…”

Aggregation-induced emission enhancement (AIEE)-active boron-difluoride dyes with reversible mechanochromic fluorescence

“…But in the solid state, the rotation was restricted, therefore, they emit low or no uorescence in dilute solutions but intense uorescence in the solid state. Although a few examples of AIEE complexes ascribed to J aggregation, 36,37 excimer formation [38][39][40] have been reported, there have been limited reports on AIEE boron-diuoride dyes based on J(H)aggregate which are formed between chromophores with tight chromophore spacing and strong coupling, 41 and it is still highly signicant to explore new AIEE dyes based on boron-diuoride chromophore for developing new functional luminescent materials. On the other hand, the aggregation and deaggregation might be manipulated by external stimuli (heat, pressure and etc.)…”

Protonation induced redshift in the fluorescence of a pyridine derivative as a potential anti-counterfeiting agent

“…32 Moreover, utilization of the pyridine moiety generally enhances the optical and fluorescence aggregation properties as well as electron-transporting abilities in conjugated molecules. 32 Because of the lone pair electrons on nitrogen atoms, pyridine acts as an electron acceptor unit for proton binding. Furthermore, the combination of donor and acceptor units in the same molecule induces intramolecular charge transfer (ICT) leading to electron delocalization thus enhancing the electrical behavior of the system.…”

“…A pyridine ring is often chosen as the acceptor when designing the donor–acceptor system because of its well-known electron-withdrawing nature. 32 Moreover, utilization of the pyridine moiety generally enhances the optical and fluorescence aggregation properties as well as electron-transporting abilities in conjugated molecules. 32 Because of the lone pair electrons on nitrogen atoms, pyridine acts as an electron acceptor unit for proton binding.…”