Highly Luminescent Inorganic–Organic Hybrids with Molecularly Dispersed Perylene

Abstract

A highly photoluminescent material was obtained by the incorporation of perylene into an inorganic−organic hybrid film. Octosilicate, a layered alkali silicate, was modified with a cationic surfactant, dioleyldimethylammonium ion, to accommodate perylene molecularly and uniformly. The perylene-doped dioleyldimethylammonium octosilicate films were fabricated by simply casting the toluene solution of perylene with dispersed dioleyldimethylammonium octosilicate on substrates. Near-unity photoluminescence quantum efficiency was achieved for hybrids containing a high concentration of perylene.

Organophilic Clay with Useful Whiteness

“…When perylene was used (1.1 wt % loading), Φ E was 18 and 4% for 2C18-LU and N400, respectively. Iron in the silicate layer has been reported to be a possible reason for the quenching of the luminescence from dyes incorporated into smectites. , In our separate study on the photoluminescence of perylene adsorbed in a surfactant-modified synthetic layered silicate (no iron in the structure), Φ E close to 100% was observed . In the present study, the lower iron content of 2C18-LU (3.9%) over N400 (9.1%) is a possible reason for the efficient photoluminescence (higher intensity and Φ E ) compared with that from N400 samples.…”

“…62,63 In our separate study on the photoluminescence of perylene adsorbed in a surfactant-modified synthetic layered silicate (no iron in the structure), Φ E close to 100% was observed. 64 In the present study, the lower iron content of 2C18-LU (3.9%) over N400 (9.1%) is a possible reason for the efficient photoluminescence (higher intensity and Φ E ) compared with that from N400 samples. As the beneficial effect of quenching on the dye stability was reported recently, 65 further characterization (including stability) of the present products is being investigated, and the results will be reported subsequently.…”

Soap-Free Emulsion Composed of Polymer Solutions and an Aqueous Clay Suspension

“…The excitation spectra were monitored for the emission at 470 and 554 nm for perylene and R6G, respectively. 18 Morphology of the emulsion containing the fluorescent dye was characterized using confocal laser scanning microscope. The fluorescence microscope images were captured within 10 s in order to avoid the diffusion of the emulsion droplet under the microscope.…”

“…For the photoluminescence spectra in Figure d,e, excitation wavelengths of 412 and 526 nm for perylene and R6G were used. The excitation spectra were monitored for the emission at 470 and 554 nm for perylene and R6G, respectively . Morphology of the emulsion containing the fluorescent dye was characterized using confocal laser scanning microscope.…”

Intercalation of a Cationic Cyanine Dye Assisted by Anionic Surfactants within Mg–Al Layered Double Hydroxide

“…Layered materials such as layered double hydroxides (LDHs) and clay minerals have been commonly used as confinement matrixes for organic photoactive species (dye). , In addition to prevent their possible degradation, the use of the 2D inorganic materials improves the organization of the dyes and their photoluminescent properties. − Indeed, in contrast to bulk solid dyes where multiple organizations can be formed, showing a lack of consistence in the photoluminescent properties with possible red-shifted fluorescence, line broadening, and even luminescence quenching, the intercalation of dyes within the interlayer space of the host inorganic matrixes drives to the formation of J -aggregates at very low dye contents. ,− In those singular aggregates with head-to-tail arrangement of the dye molecules that can be observed at large concentrations of bulk dye, the absorption occurs at a longer wavelength than that of the initial absorption band, with the observation of a sharp absorption band and resonance fluorescence. − …”