PROPERTIES OF A SERIES OF CARBAZOLE DERIVATIVES CONTAINING STYRENE
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and properties. With conjugated length of 3-position and 6-
position of the carbazole core increasing, HOMOs increase, and
LUMOs and energy gaps decrease, thereby improving the charge
injection and transport balance. Because of the influence of the
electron-donating character in the different N-alkyl substituents,
HOMO energies slightly decreased. Meanwhile, the LUMO and
energy gaps slightly increased, which led to the change in the
electron-accepting ability in the symmetric-type carbazole.
When the OPA of the compounds was studied, the good
agreement between the theoretical electronic transitions and
the experimental spectra indicates that a reasonable design of
these blue light-emitting polymers is possible, and this should
contribute to the development of organic LEDs. The TPA cross-
section was explored by extending the conjugation via vinyl-
benzene, styryl group from the 3, 6-position of the bilateral
carbazole unit and various carbazole N-alkyl substituents. The
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changed slightly. Hence, the result corroborated that increasing
the molecular conjugation length via vinylene bridge can enhance
the TPA cross-section and that the various electron-donating
effects of N-alkyl substituents in the 9-position of carbazole also
affect the TPA cross-section. Although simpler carbazole deriva-
tives have been designed and synthesized in optical materials,
bisstyryl carbazole based on better coplanarity and conjugation
is reasonably well suited for TPA optical storage, organic electro-
luminescent, and two-photon microscopy biological imaging ap-
plication. The investigation on its applications is progressing in
our laboratory, and the results will be released in the future.
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SUPPORTING INFORMATION
Figure for Supporting Information the results of NMR, IR, and LC-
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Acknowledgements
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This work was partially supported by the National Basic Research
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