Polyurethanes containing indole-based non-linear optical chromophores: from linear chromophore to H-type

Two new H type of indole-based chromophores were designed and successfully introduced to the polymeric system, the resultant polymers demonstrated enhanced NLO effects, good processability, thermal stability and nearly excellent transparency, indicating the advantages of H type chromophore moieties. And they could be promising candidates for the practical applications as new photonic materials.