Bezvikonnyi Oleksandr, Bernard Ronit Sebastine, Andruleviciene Viktorija, Volyniuk Dmytro, Keruckiene Rasa, Vaiciulaityte Kamile, Labanauskas Linas, Grazulevicius Juozas Vidas
Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko g. 59, LT-51423 Kaunas, Lithuania.
Department of Physics, Faculty of Mathematics and Natural Science, Kaunas University of Technology, Studentų g. 50, LT-51369 Kaunas, Lithuania.
Materials (Basel). 2022 Nov 29;15(23):8495. doi: 10.3390/ma15238495.
New derivatives of carbazole and diphenyl imidazole for potential multiple applications were synthesized and investigated. Their properties were studied by thermal, optical, photophysical, electrochemical, and photoelectrical measurements. The compounds exhibited relatively narrow blue light-emission bands, which is favorable for deep-blue electroluminescent devices. The synthesized derivatives of imidazole and carbazole were tested as fluorescent emitters for OLEDs. The device showed deep-blue emissions with CIE color coordinates of (0.16, 0.08) and maximum quantum efficiency of 1.1%. The compounds demonstrated high triplet energy values above 3.0 eV and hole drift mobility exceeding 10 cm/V·s at high electric fields. One of the compounds having two diphenyl imidazole moieties and -butyl-substituted carbazolyl groups showed bipolar charge transport with electron drift mobility reaching 10 cm/V·s at electric field of 8 × 10 V/cm. The synthesized compounds were investigated as hosts for green, red and sky-blue phosphorescent OLEDs. The green-, red- and sky-blue-emitting devices demonstrated maximum quantum efficiencies of 8.3%, 6.4% and 7.6%, respectively.
合成并研究了咔唑和二苯基咪唑的新型衍生物，用于潜在的多种应用。通过热学、光学、光物理、电化学和光电测量研究了它们的性质。这些化合物表现出相对较窄的蓝光发射带，这对深蓝色电致发光器件有利。将合成的咪唑和咔唑衍生物作为有机发光二极管（OLED）的荧光发射体进行了测试。该器件显示出深蓝色发射，CIE色坐标为（0.16, 0.08），最大量子效率为1.1%。这些化合物在高电场下表现出高于3.0 eV的高三重态能量值和超过10 cm²/V·s的空穴漂移迁移率。其中一种具有两个二苯基咪唑部分和丁基取代咔唑基的化合物表现出双极电荷传输，在8×10⁵ V/cm的电场下电子漂移迁移率达到10 cm²/V·s。对合成的化合物作为绿色、红色和天蓝色磷光OLED的主体进行了研究。绿色、红色和天蓝色发光器件的最大量子效率分别为8.3%、6.4%和7.6%。
