Push–Pull (Iso)quinoline Chromophores: Synthesis, Photophysical Properties, and Use for White‐Light Emission

Abstract

The photophysical properties of a series of conjugated push-pull (iso)quinolines have been studied. The compounds were synthesized by well-established and straightforward methodologies. The materials exhibited not only emission solvatochromism in a variety of non-polar solvents, but also tunable halochromism. Some of the compounds remained moderately luminescent after protonation and these had a red emissive form, which was used to obtain white light emission, both in solution and in thin film, by the controlled protonation of the initially blue-green emitting materials. This methodology has potential applications in white OLED fabrication with two forms of a single emitter in equilibrium.

A novel donor–π–acceptor halochromic 2,6-distyrylnaphthalene chromophore: synthesis, photophysical properties and DFT studies

“…This observation indicated that at specic pH, neutral and protonated form of the chromophore whose emission bands are complementary with a broad distribution could simultaneously exist in the solution and cause in white light emission. [42][43][44][45] Another surprising outcome that emerged from the data was a noticeable white light quantum yield (F) of 0.13. This nding represented the great potential of this chromophore for white lighting device fabrication.…”

Synthesis, Photophysical Properties, Theoretical Studies, and Living Cancer Cell Imaging Applications of New 7-(Diethylamino)quinolone Chalcones

“…This was accomplished by examining the emission characteristics of the fluorophores in solvents of different polarities. The emission spectra showed positive solvatochromism properties with increasing solvent polarity because the highly polar TICT state is specially stabilized concerning a planar local excited (LE) state in polar solvents. , This positive solvatochromic behavior was quantitatively determined using different solvent polarity plots, such as the plot of the maximum emission band regarding the empirical polarity scale E T (30) − as well as the plot of the relationship between Stokes shifts vs orientation polarizability (Lippert–Mataga plot). , The plot of emission maximum vs E T (30) (Figure d) displays a linear tendency of 4 , 5a , and 5b with negative slopes of −206.0 cm –1 ( R 2 = 0.63), – 214.5 cm –1 ( R 2 = 0.96), and −222.6 cm –1 ( R 2 = 0.95), respectively (Figure d). Nevertheless, compounds 5a and 5b showed many sheer slopes with linear coefficients better than those of 4 , evidencing a more significant variation of the solvatofluorochromism effect with the variation of solvent properties.…”

Tunable full-color emission of stilbazoles containing a 2-halo-3,4-dicyanopyridine acceptor

“…1). 19–45 This is due to the fact that the pyridine ring acts as an electron-withdrawing group in the push–pull chromophore system. 44,45 Moreover, stilbazoles are often characterized by facile preparation methods and a wide application range.…”

“…44,45 Moreover, stilbazoles are often characterized by facile preparation methods and a wide application range. For example, they can be used as non-linear optical materials (NLO), 19–22 light-absorbing components of dye-sensitized solar cells (DSSC), 23,24 organic light emitting diodes (OLED), 25,26 memory devices, 27 materials for two-photon absorption, 28,29 chemosensors, 30–36 fluorescent label probes 37–40 and dyes, 41–43 etc .…”

“…Thus, it should be noted that a huge amount of data on the synthesis and application of various heterocyclic styryl derivatives has been collected to date. 19–45,47–50 However, stilbazoles with a nicotinonitrile fragment remain less studied, and there are also no data about azastilbenes with a dicyanopyridine fragment in the literature.…”