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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yakimanskiy A. A., Kaskevich K. I., Zhukova E. V., Berezin I. A., Litvinova L. S., Chulkova T. G., Lypenko D. A., Dmitriev A. V., Pozin S. I., Nekrasova N. V., Tomilin F. N., Ivanova D. A., Yakimansky A. V.
Заглавие : Synthesis, photo- and electroluminescence of new polyfluorene copolymers containing dicyanostilbene and 9,10-dicyanophenanthrene in the main chain
Колич.характеристики :14 с
Место публикации : Materials. - 2023. - Vol. 16, Is. 16. - Ст.5592. - ISSN 19961944 (eISSN), DOI 10.3390/ma16165592
Примечания : Cited References: 25. - This work was supported by the Russian Science Foundation, grant no. 23-43-00060
Аннотация: Using palladium-catalyzed Suzuki polycondensation, we synthesized new light-emitting fluorene copolymers containing the dicyano derivatives of stilbene and phenanthrene and characterized them by gel permeation chromatography, UV-vis absorption spectroscopy, spectrofluorimetry, and cyclic voltammetry. The photoluminescence spectra of the synthesized polymers show significant energy transfer from the fluorene segments to the dicyanostilbene and 9,10-dicyanophenanthrene units, which is in agreement with the data of theoretical calculations. OLEDs based on these polymers were fabricated with an ITO/PEDOT-PSS (35 nm)/p-TPD (30 nm)/PVK (5 nm)/light emitting layer (70–75 nm)/PF-PO (20 nm)/LiF (1 nm)/Al (80 nm) configuration. Examination of their electroluminescence revealed that copolymers of fluorene with dicyanostilbene show yellow-green luminescence, while polymers with 9,10-dicyanophenanthrene have a greenish-blue emission. The 9,10-dicyanophenanthrene units have a more rigid structure compared to dicyanostilbene and, in OLEDs based on them, an increase in maximum brightness is observed with an increase in the content of the additive to the polymer chain. In particular, the device using fluorene copolymer with 9,10-dicyanophenanthrene (2.5 mol%) exhibited a maximum brightness of 9230 cd/m2 and a maximum current efficiency of 3.33 cd/A.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yakimanskiy, Anton A., Kaskevich, Ksenia I., Chulkova, Tatiana G., Krasnopeeva, Elena L., Savilov, Serguei V., Voinova, Vera V., Neumolotov, Nikolay K., Zhdanov, Andrey P., Rogova, Anastasia V., Tomilin F. N., Zhizhin, Konstantin Yu., Yakimansky, Alexander V.
Заглавие : Effect of complexation with closo-decaborate anion on photophysical properties of copolyfluorenes containing dicyanophenanthrene units in the main chain
Колич.характеристики :11 с
Место публикации : Micro. - 2023. - Vol. 3, Is. 4. - P.930-940. - ISSN 26738023 (eISSN), DOI 10.3390/micro3040063
Примечания : Cited References: 23. - This work was supported by the Russian Science Foundation, grant no. 23-43-00060
Аннотация: The functionalization of copolyfluorenes containing dicyanophenanthrene units by closo-decaborate anion is described. Target copolyfluorenes were analyzed using SEM, UV-vis, luminescence, NMR, and Fourier-transform infrared (FTIR) spectroscopy. The effect of complexation with the closo-decaborate anion on the photophysical properties was studied both experimentally and theoretically. The PL data indicate an efficient charge transfer from fluorene to the dicyanophenanthrene units coordinated to the closo-decaborate. The coordination of closo-decaborate clusters to the nitrile groups of copolyfluorenes provides an important route to new materials for sensors and light-emitting devices while, at the same time, serving as a platform for further study of the nature of boron clusters.
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