Long-Term-Stable Strong Second Harmonic Generation in Flexible DAST−PVDF Composite Films Realized by the Interface Interactions (Adv. Mater. Interfaces 17/2021)

DAST–PVDF Composite Films In article number 2100485, Xiaomeng Cheng, Xiangdong Xu, and co-workers demonstrate that the interface interactions of the electrostatic interactions and the intermolecular hydrogen bonds between 4-N,N-dimethylamino-4′-N′-methyl-stilbazolium tosylate (DAST) and polyvinylidene fluoride (PVDF) improve the conjugation of p electrons and molecular ordering of DAST, thus making tunable and long-term-stable strong nonlinear optical properties of flexible composite films.