Nonconjugated\nPolyurethane Derivatives with Aggregation-Induced\nLuminochromism for Multicolor and White Photoluminescent Films

A simple and effective strategy to obtain solid-state\nmulticolor\nemitting materials is a particularly attractive topic. Nonconventional/nonconjugated\npolymers are receiving widespread attention because of their advantages\nof rich structural diversity, low cost, and good processability. However,\nit is difficult to control the molecular conformation or to obtain\nthe crystal structure of amorphous molecules, which means it is a\nchallenge to obtain nontraditional polymeric materials with multicolor\nemission. In this work, a polyurethane derivative (<b>PUH</b>) with red-shifted emission was synthesized by a simple one-pot polymerization\nreaction. By exploiting the aggregation-induced luminochromism of <b>PUH</b>, a series of plastic films with tunable emission from\nblue to orange, and white-light emission, was obtained by doping different\namounts of <b>PUH</b> into poly(methyl methacrylate) (PMMA),\nthereby changing the aggregation degree of <b>PUH</b>. This\nwork demonstrates the excellent promise of polyurethane derivatives\nfor the simple fabrication of large-scale flexible luminescent films.