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Advanced functional materials: fully conjugated covalent organic frameworks with octapole structure -- new two-photon fluorescence materials with high quantum efficiency and high absorption cross section
. For small organic molecules researchers found that dipole compounds with donor – π – receptor (D – π – a) structure quadrupole compounds with D – π – D or a – π – a structure octapole compounds with multi branched structure (A3 – (D – nucleus) or D3 – (a – nucleus)) tend to show larger absorption cross sections. In addition previous studies have shown that conjugation length strength of receptor donor molecular height symmetry molecular planarity also affect the size of TPA cross section. Compared with one-dimensional linear molecules of dipole quadrupole compounds octapolar compounds with two-dimensional planarity tend to show more effective intramolecular charge transfer achieve larger absorption cross section.

believe that this research can add color to the application of COFS provide new research ideas for the design of COFS based nonlinear optical materials. The non-linear optical materials based on COFS will shine in the fields of optical information storage two-photon imaging up conversion laser optical limiting.
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