Turn-on solid state luminescence by solvent-induced modification of intermolecular interactions

Abstract

Solid-state luminescent materials which are sensitive to external stimuli are of enormous importance due its potential for application as smart responsive materials and devices. Here we report the changes in...

Fast photoactuation of elastic crystals based on 3-(naphthalen-1-yl)-2-phenylacrylonitriles triggered by subtle photoisomerization

“…6, the dispersion energy was principally contributed by the p-p interaction. 71 The direction of the Coulomb energy is consistent with the direction of the C-HÁ Á ÁN hydrogen bonds (Fig. 6a).…”

Luminescence in Crystalline Organic Materials: From Molecules to Molecular Solids

“…[ 373 ] The proper choice of co‐formers may provide an elegant path to structures with a systematic shift of the π‐stack arrangement (Scheme 9) and the subsequent emission colors, as shown in a recent example (BZDSB), see Figure 21b. [ 374,375 ]…”

Multistimuli-Responsive Squaraine Dyad Exhibiting Concentration-Controlled Vapochromic Luminescence

“…Stimuli-responsive organic materials (SOMs) with intriguing luminescence switching properties have been widely studied for both fundamental research and practical applications in the areas of sensing, data security, memory, display devices, and anticounterfeiting. − The photophysical properties of SOMs are usually closely correlated with the interactions between the component molecules and can be readily tuned by external stimuli such as shear force, heat, and exposure to vapor, which are known as mechanochromism, thermochromism, and vapochromism, respectively. − Vapochromic materials, whose color or fluorescence is responsive to certain gases or volatile organic compounds (VOCs), are promising candidates for portable gas sensors for use in diagnosis, safety inspection, and toxic gas detection − and for smart inks used in anticounterfeiting and confidential data encryption. − The reported vapochromic mechanisms can be mainly classified into three types according to the role of the vapor molecules during the luminescence switching process: accelerating the rearrangement of luminophores from an unstable or metastable state to a stable state as a catalyst, − inserting into the cavity or crystal lattice of the luminophores as guests, − and reacting with luminophores as reactants. , In most cases, each organic solvent vapor plays only one of these roles and results in only one color change response during the vapochromic process (Scheme ). Therefore, examples exhibiting two color change responses induced by one solvent vapor are very limited.…”