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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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