Synthesis and Ultrafast Broadband Optical Limiting Properties of a Two-Branched Twistacene.

ABSTRACT: A novel two-branched twistacene (PyDN) has been designed and synthesized for application on ultrafast optical limiting. This twistacene exhibits excellent two photon absorption and two photon absorption-induced excited singlet state absorption, which was systematically investigated with a femtosecond Z-scan experiment, transient absorption spectrum, and two-photon excited fluorescence experiments. The admirable two photon absorption is attributed to the high degree of π electron delocalization in twistacene which is caused by introduction of two strong donors. The excited singlet state absorption cooperates with two-photon absorption to provide an excellent ultrafast optical limiting behavior with high linear transmittance, where the thresholds are 2.3-5.3 mJ/cm² in the s

SUBMITTER: Han Y 

PROVIDER: S-EPMC9181967 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature