Stimuli-responsive triplet-triplet annihilation upconversion with guanidyl functionalized annihilators for enhanced ratiometric sensing of trace water in MeOH

Recent advances of triplet–triplet annihilation upconversion in solvent-free solid materials

“…Compared with the strategies of covalently linking the UC components on the polymer matrix to avoid the accumulation of molecules resulting from the limited dispersive capacity of the polymer matrix, the orderly assembly of components by supramolecular interactions showed advantages. Our studies have shown that the supramolecular self-assembly of the UC components significantly improved the TTA-UC efficiencies in the solution 64–67 and also demonstrated that well-organized photosubstrates by supramolecular interactions showed unique photochemical and photophysical properties. 68–81 In 2022, we 52 prepared an organic–inorganic nanocomposite by the self-assembly of poly( N -vinyl-2-pyrrolidone) (PVP) and LAPONITE®XLG clay and was used as an excellent solid matrix for TTA-UC.…”

Anthracene-(aminomethyl)phenylboronic acid ester-immobilized glass substrates as fluorescent sensing materials based on photo-induced electron transfer for detection and visualization of water

“…In recent years, there has been increasing interest in the development of fluorescent sensors and their functional materials, including polymers, membranes, and sensor-immobilized substrates for detecting and visualizing water in solids, solutions, and gas or on material surfaces, because such fluorescent sensing systems for water are crucial to environmental and quality control monitoring, industrial processes, food inspection and so on. 1–24 Actually, some kinds of organic fluorescent sensors for water, based on ICT (intramolecular charge transfer), 25–33 ESIPT (excited state intramolecular proton transfer), 34–37 PET (photo-induced electron transfer), 38–52 or solvatochromism have been developed which exhibit photophysical changes in wavelength, intensity, and lifetime of fluorescence emission depending on the water content. Hence, over the last decade and a half, we continued to make much effort to design and develop PET-type fluorescent sensors for water in solvents.…”

Supramolecular Annihilator with DPA Parallelly Arranged by Multiple Hydrogen-Bonding Interactions for Enhanced Triplet–Triplet Annihilation Upconversion

“…Supramolecular assembly presents an excellent strategy to precisely arrange and control the orientation of molecules [39][40][41][42][43][44][45]. Previously, we have demonstrated that chemically tuning the structures of sensitizers, as well as the host-guest complexation, could significantly facilitate the TTET process [46,47], and, by carefully regulating the aggregation state of the annihilator, the TTA process was selectively manipulated without disturbing the TTET process [48,49]. Moreover, by self-assembling the annihilators on the edge of an inorganic clay nanosheet through electrostatic attraction, a UC quantum yield (Φ UC ) record in the solid state was achieved [50].…”