Conjugated push‐pull molecules that incorporate nitrogen heterocycles as electron‐withdrawing units are interesting materials because of their luminescence properties. These chromophores can be easily and reversibly protonated at the nitrogen atom of the heterocyclic ring and this can cause dramatic color changes. White and multi‐color photoluminescence both in solution and in the solid state can be obtained by an accurate control of the amount of acid. Thus, with a suitable design these compounds have potential applications in the development of colorimetric pH sensors and the fabrication of OLEDs based on only one material. We provide here a brief overview of our collaborative efforts made in this area.

中文翻译：

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通过质子化调节推挽氮杂环杂环发色团的光物理性质：法国-西班牙-捷克项目的简要概述

结合了氮杂环作为吸电子单元的共轭推挽分子由于其发光特性而成为令人感兴趣的材料。这些生色团可以在杂环的氮原子上容易地和可逆地质子化，并且可以引起显着的颜色变化。通过精确控制酸的量，可以得到溶液和固态的白色和多色光致发光。因此，通过适当的设计，这些化合物在比色pH传感器的开发和仅基于一种材料的OLED的制造中具有潜在的应用。我们在这里简要概述了我们在这一领域的合作。