Dual-Responsive Thermally Activated Delayed Fluorescence of Spiropyran Derivatives

Abstract

A series of photochromic dyes SP1-3 with dual-responsive thermally activated delayed fluorescence (TADF) characteristic were reported in this research for the first time. Benefited from the reversible light-responsive property of SP1-3, the eigen TADF of these compounds could be regulated between 588 nm and 678 nm or tuned on/off by different wavelengths of light irradiations in polyvinylpyrrolidone (PVP) matrix. The emission lifetime of spiropyran derivative was prolonged to millisecond level for the first time. Besides, the delayed fluorescence of SP1 and SP3 could also be manipulated by mechanical force because of the mechanochromism property of SP1 and SP3. This research was a big breakthrough for photochromic materials and could broad the scope of it.

Molecular Cage with Dual Outputs of Photochromism and Luminescence Both in Solution and the Solid State

“…Compared to other stimuli-responsive materials, 1−7 this class of photoactive compounds have unique advantages, such as contactless control and quick responsiveness, which have enabled their wide applications such as in photoresponsive materials, 8−11 biomedical materials, 12−14 and supramolecular materials. 15−17 Many conventional photochromic luminophores, e.g., azobenzenes, 18 diarylethenes, 19,20 spiropyrans, 21,22 and so on, 23,24 suffer from the aggregation-caused quenching (ACQ) effect at high concentrations. 25 One potential solution to this ACQ problem is covalently coupling the photochromic unit with AIEgens, i.e., materials exhibiting aggregation-induced emission (AIE) 26 properties.…”

“…Many conventional photochromic luminophores, e.g., azobenzenes, diarylethenes, , spiropyrans, , and so on, , suffer from the aggregation-caused quenching (ACQ) effect at high concentrations . One potential solution to this ACQ problem is covalently coupling the photochromic unit with AIEgens, i.e., materials exhibiting aggregation-induced emission (AIE) properties.…”

A time-resolved and visualized host–guest self-assembly behavior controlled through kinetic trapping

“…Such non-equilibrium states are now more frequently reported only in supramolecular polymerization. [7][8][9][10][11][12] To date, a number of studies have made a celebrated effort to clarify the phenomenon and provide inherent insights into kinetic traps in supramolecular assembly. 13 On the other hand, the relevant time-controlled kinetic non-equilibrium process tends to be investigated in 1D supramolecular polymerization of intended aromatic molecules, and more effort needs to be put into uncovering the complexity of supramolecular self-assembly systems.…”

C3-Symmetric Propeller-like Phenanthridine Derivative with Multiple Write-In Modes for Programmable Anti-Counterfeiting

“…Second, reported SRCMs with multiple stimuli-responsive behaviors work in a combinational mode, i.e. , their outputs are a simple combination of the response of an individual stimulus. ,− Further, their reversibility to different stimuli is poorly engineered, and therefore, they are incompetent to construct sophistical logics and advanced anti-counterfeiting schemes. Third, conventional multiple stimuli-responsive molecules generally possess complex molecular structures, requiring tedious synthesis as well as a rigorous fabrication process, which further limit the practical application of SRCMs.…”