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

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