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Synthesis, photo- and electroluminescence of new polyfluorene copolymers containing dicyanostilbene and 9,10-dicyanophenanthrene in the main chain / A. A. Yakimanskiy, K. I. Kaskevich, E. V. Zhukova [et al.] // Materials. - 2023. - Vol. 16, Is. 16. - Ст. 5592, DOI 10.3390/ma16165592. - Cited References: 25. - This work was supported by the Russian Science Foundation, grant no. 23-43-00060 . - ISSN 1996-1944
Кл.слова (ненормированные):
copolyfluorene -- phenanthrene-9,10-dicarbonitrile -- α,α′-dicyanostilbene -- luminescence -- OLEDs
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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Держатели документа:
Institute of Macromolecular Compounds RAS, Bolshoi Prospect of Vasilyevsky Island 31, St. Petersburg, 199004, Russian Federation
A.N. Frumkin Institute of Physical Chemistry and Electrochemistry RAS, Leninskiy Prospect 31, bld.4, Moscow, 119071, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
School of Non-Ferrous Metals and Material Science, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
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.; Томилин, Феликс Николаевич; Ivanova, D. A.; Yakimansky, A. V.
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Effect of complexation with closo-decaborate anion on photophysical properties of copolyfluorenes containing dicyanophenanthrene units in the main chain / A. A. Yakimanskiy, K. I. Kaskevich, T. G. Chulkova [et al.] // Micro. - 2023. - Vol. 3, Is. 4. - P. 930-940, DOI 10.3390/micro3040063. - Cited References: 23. - This work was supported by the Russian Science Foundation, grant no. 23-43-00060 . - ISSN 2673-8023
Кл.слова (ненормированные):
CAM-B3LYP -- charge transfer -- copolyfluorene -- energy transfer -- hole-electron distribution -- nitrilium derivatives of closo-decaborate anions -- lambda-diagnostic -- luminescence -- phenanthrene-9,10-dicarbonitrile -- TD-DFT
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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Держатели документа:
Institute of Macromolecular Compounds, RAS, Bolshoi Prospect of Vasilyevsky Island 31, Saint Petersburg 199004, Russia
Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
Kurnakov Institute of General and Inorganic Chemistry, RAS, Moscow 119991, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Laboratory for Digital Controlled Drugs and Theranostics, Federal Research Center KSC SB RAS, Krasnoyarsk 660041, Russia

Доп.точки доступа:
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.; Рогова, Анастасия Владимировна; Tomilin, F. N.; Томилин, Феликс Николаевич; Zhizhin, Konstantin Yu.; Yakimansky, Alexander V.
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