Controlling optoelectronic properties of carbazole-pyridinium luminophores via kinetic polymorphism
Abstract
This study demonstrates the use of kinetic polymorphism to modulate the optoelectronic properties of the donor–acceptor luminophore KL1421 without chemical modification. By employing a swift precipitation method, we selectively isolated three distinct polymorphs arising from specific rotational conformers of the pyridinium subunit, as confirmed by structural and vibrational analysis. These structural variations result in tunable band gaps (2.80–2.95 eV) and high solid-state quantum yields (61–80%), where geometric constraints on the donor–acceptor twist angle directly influence HOMO–LUMO overlap. Furthermore, temperature-dependent photoluminescence reveals that out-of-plane pyridinium rotamers, which restrict π–π+ interactions, promote thermally activated non-radiative transitions via triplet traps, distinguishing the mechanism from delayed fluorescence and highlighting the potential of kinetic control for tailoring functional organic materials.
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BibTeX
@article{viter2026controlling,
title = {{Controlling optoelectronic properties of carbazole-pyridinium luminophores via kinetic polymorphism}},
author = {Roman Viter and Matiss Martins Drava and Alice Sciortino and Mahmoud Abid and Viktor Zabolotnii and Marco Cannas and Mikhael Bechelany and Artis Kinens},
journal = {Materials Advances},
year = {2026},
month = sep,
doi = {10.1039/d6ma00494f},
url = {https://hal.umontpellier.fr/hal-05749322v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Controlling optoelectronic properties of carbazole-pyridinium luminophores via kinetic polymorphism
AU - Roman Viter
AU - Matiss Martins Drava
AU - Alice Sciortino
AU - Mahmoud Abid
AU - Viktor Zabolotnii
AU - Marco Cannas
AU - Mikhael Bechelany
AU - Artis Kinens
PY - 2026
DA - 2026/09/14
JO - Materials Advances
DO - 10.1039/d6ma00494f
UR - https://hal.umontpellier.fr/hal-05749322v1
AB - This study demonstrates the use of kinetic polymorphism to modulate the optoelectronic properties of the donor–acceptor luminophore KL1421 without chemical modification. By employing a swift precipitation method, we selectively isolated three distinct polymorphs arising from specific rotational conformers of the pyridinium subunit, as confirmed by structural and vibrational analysis. These structural variations result in tunable band gaps (2.80–2.95 eV) and high solid-state quantum yields (61–80%), where geometric constraints on the donor–acceptor twist angle directly influence HOMO–LUMO overlap. Furthermore, temperature-dependent photoluminescence reveals that out-of-plane pyridinium rotamers, which restrict π–π+ interactions, promote thermally activated non-radiative transitions via triplet traps, distinguishing the mechanism from delayed fluorescence and highlighting the potential of kinetic control for tailoring functional organic materials.
SN - 2633-5409
ER -