Unveiling the unusual halochromic response and phase behavior of a dihydropyrrolo[3,2- <i>b</i> ]pyrrole electrochrome

A carbazole-functionalized pyrrolo[3,2-<i>b</i>]pyrrole (Cbz-DHPP) chromophore was synthesized, exhibiting high-contrast electrochromism, strong blue fluorescence, halochromism, and polymorphism. These findings advance understanding of DHPP structure-property relationships, while introducing new electrochromic colors and the first examples of halochromism and mesomorphic properties in DHPP-based materials, highlighting their potential in optoelectronic applications.