Emission enhancement and high sensitivity of a π-conjugated dye towards pressure: the synergistic effect of supramolecular interactions and H-aggregation

Abstract

We prepared a HLCT-type dye with high PL efficiency in solid solutions. In the crystalline state, the H-aggregated dye with weak supramolecular interactions showed enhanced emission under low pressures (5 MPa).

Fundamental Aspects of Xanthene Dye Aggregation on the Surfaces of Nanocluster Polyoxometalates: H‐ to J‐Aggregate Switching

“…The face‐to‐face orientation of RhB in a H‐dimer provides the π‐electrons with an extensive area for delocalization, which, in turn, is responsible for the much larger carrier mobilities revealed for OTFTs . In addition, recent advances in materials with exciting pressure‐induced emission enhancement also owes much to H‐aggregate formation …”

Deep-red fluorescence from isolated dimers: a highly bright excimer and imaging in vivo

“…15,16a For comparison, we prepared a similar luminophor, BTA-DMeO, in which the twisted TPA unit on the side of BTA-TPA was replaced by a benzene group. 6 This luminophor, adopting a continuous dimeric stacking (H-aggregation; Fig. S6 †), showed a PLQY as low as 9%.…”

“…However, our group recently prepared a deep-red benzothiadiazole (BTA) derivative exhibiting the HLCT state. 6 The luminophor presented good emissive abilities in the monomeric form, unexpectedly, which were seriously weakened in the solid state due to the formation of the H-aggregates. Clearly, even for HLCT-type LOMs, the molecular packing mode is still critical for the PL efficiency.…”

Construction of Enhanced Photostability Anthraquinone-Type Nanovesicles Based on a Novel Two-Step Supramolecular Assembly Strategy and Their Application on Multiband Laser-Responsive Composites

“…Small-molecular organic dyes (SMODs) have been applied in the field of nanogenerators, organic light-emitting diodes, bioimaging, cancer diagnosis, , and optical sensing devices owing to their excellent physical and chemical properties, such as high quantum efficiency, easily modified molecular structure, and low toxicity . But their abundance of aromatic ring rigid structures as optical sensors in nanodispersed solutions or solid films are usually accompanied by an obvious aggregation effect, − which leads to fluorescence aggregation-caused quenching (ACQ) , or light absorption intensity decreasing. , Addtionally, there is a common bottleneck for the development of SMODs that is their inferior photostability − and photobleaching property. − To overcome these problems, there are three main ways to improve the photostability of SMODs and to solve their excessive aggregation effect.…”