Frontier luminous strategy of functional silica nanohybrids in sensing and bioimaging: From ACQ to AIE

Abstract

Fluorescent silica organic–inorganic nanohybrids which combine designable luminescence performance of organic fluorescent dyes and various outstanding advantages of silica nanomaterials have attracted increasing research interests in these fascinating areas. Optical transparency and facile functional modification properties of silica material provide great opportunities to integrate desired fluorescent molecules for various frontier luminous applications. However, conventional organic dyes are typically subject to aggregation‐caused quenching due to their aggregation in silica matrix, which could be detrimental for their performance in sensing and biomedical applications. The appearance of aggregation‐induced emission luminogens (AIEgens) paves a new way for developing highly efficient fluorescent silica nanohybrids (FSNs). FSNs with intensive luminescence could be obtained due to the formation of aggregates and the restricted intramolecular motion of AIEgens in silica inorganic matrix. In this review, the reported fabrication methodologies of various FSNs based on colloidal silica nanoparticles (SNs) and mesoporous SNs including physical entrapment and covalent strategies are summarized. Especially, the AIEgens‐functionalized silica hybrid nanomaterials are introduced in detail. Furthermore, chemical sensing, biosensing, and bioimaging applications of resultant FSNs are also discussed.

High-Efficiency Circularly Polarized Luminescence from Twisted Tetraarylethylene-Bridged Polybissilsesquioxane Nanotubes

“…It is worth noting that they are longer than that of BTSTAE (4.61 ns, Figure b). These results are understandable: compared with the organosiloxane precursor, the TAE units of the polybissilsesquioxanes are embedded in a more rigid environment, which greatly restricts the intramolecular motions of the AIEgens, leading to enhanced luminescence and longer fluorescence lifetimes of the hybrid silicas, ,− …”

Y‐Shaped Pyrene‐Based Aggregation‐Induced Emission Blue Emitters for High‐Performance OLED Devices

“…[27] In addition, the compounds Py-TPA, Py-2TPA, and Py-2TPE exhibited a similar absorption behavior with a slight red-shifted maximum absorption peak in six different polar solvents, which indicated that the electronic structure of the compounds in the ground state is independent of the solvent polarity (Figure S12, Supporting Information). [28] Both the TPA and TPE motifs are often exploited to construct AIEgens for potential applications in organic electronics, [29] bioimaging, [30] etc. To investigate the possible AIE feature of the compounds Py-TPA, Py-2TPA and Py-2TPE, their emission behavior was examined in dilute THF and THF/H 2 O mixtures, as shown in Figure 2.…”

Recent Advances of Interface Exciplex in Organic Light-Emitting Diodes

“…After deep and extensive research into doping technology [108][109][110][111][112][113], various novel strategies have been proposed to further improve the performances of interface exciplexbased devices. By adopting the strategy of synergistic sensitization using phosphor and interface exciplex, Chen et al developed a green-emitting fluorescent OLED based on the ultrathin fluorescent emission layer, as shown in Figure 8.…”