Title Effects of electron-withdrawing strengths of the substituents on the properties of 4-(carbazolyl-R-benzoyl)-5-CF3-1H-1,2,3-triazole derivatives as blue emitters for doping-free electroluminescence devices /
Authors Stanitska, Mariia ; Pokhodylo, Nazariy ; Lytvyn, Roman ; Urbonas, Ervinas ; Volyniuk, Dmytro ; Kutsiy, Stepan ; Ivaniuk, Khrystyna ; Kinzhybalo, Vasyl ; Stakhira, Pavlo ; Keruckiene, Rasa ; Obushak, Mykola ; Gražulevičius, Juozas Vidas
DOI 10.1021/acsomega.4c01077
Full Text Download
Is Part of ACS Omega.. Washington : American Chemical Society. 2024, vol. 9, iss. 12, p. 14613-14626.. ISSN 2470-1343
Abstract [eng] The synthesis of four 4-(carbazolyl-R-benzoyl)-5-CF3-1H-1,2,3-triazoles with extra groups ((3-methyl)-phenyl-, 4-fluorophenyl-, quinolinyl-, or (3-trifluoromethyl)-phenyl-) in the acceptor fragment has been reported. The effects of substituents with different electron-withdrawing strengths on the thermal, electrochemical, photophysical, and electroluminescence properties of the synthesized compounds are discussed. The results of X-ray analyses and density functional theory (DFT) calculations support unusual molecular packing and electronic properties. The compounds are capable of glass formation with glass transition temperatures ranging from 54-84 °C. Ionization potentials of the compounds are in the range of 5.98-6.22 eV and electron affinities range from 3.09 to 3.35 eV. Under ultraviolet excitation, the neat films of the compounds exhibit blue emission with photoluminescence quantum yields ranging from 18 to 27%. The films of selected compounds are used for the preparation of host-free light-emitting layers of organic light-emitting diodes with very simple device structures and an external quantum efficiency of 4.6%.
Published Washington : American Chemical Society
Type Journal article
Language English
Publication date 2024
CC license CC license description