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Nosaukums oriģinālvalodā 3,3'-Bicarbazole Structural Derivatives as Charge Transporting Materials for Use in OLED Devices
Pētniecības nozare 1. Dabaszinātnes
Pētniecības apakšnozare 1.4. Ķīmija
Autori Armands Rudušs
Kaspars Traskovskis
Elīna Otikova
Aivars Vembris
Raitis Grzibovskis
Marcis Lielbardis
Valdis Kokars
Atslēgas vārdi OLED, charge transport, 3,3′-bicarbazole, host materials, luminescence, thin films
Anotācija In this study we report novel 3,3′-bicarbazole based charge transporting materials mainly designed for a use in systems containing phosphorescent iridium (III) complex emitters. A low-cost oxidative coupling reaction using FeCl 3 was employed in the synthesis of 3,3′-bicarbazole compounds. Different derivatives of 3,3′-bicarbazole with 4-ethoxyphenyl- and ethyl- substituents at 9,9′- positions and (2,2-diphenylhydrazono)methyl- and 4-(dimethylamino)styryl- substituents at 6,6′- positions were synthesized. Obtained (2,2-diphenylhydrazono)methyl- derivatives exhibit glass transition temperatures that are sufficient for applications in electronic devices. Thin amorphous films of good optical quality can be produced from synthesized materials using spin-coating method. The effect of (2,2-diphenylhydrazono)methyl- substituents at 6,6′- and 4-ethoxyphenyl- substituents at 9,9′- positions on the charge transport properties of the 3,3′-bicarbazole derivatives was investigated. With the introduction of both electron acceptor and donor moieties to 3,3′-bicarbazole structure material electron and hole drift mobilities reach approximately 1·10 -5 cm 2 /V·s. Molecule ionization (I f ) levels and electron affinity (EA f ) levels in thin films were determined using photoelectric effect experiment. Depending on the nature of substituents at 6,6′- and 9,9′- positions I f levels range from -5.19 to -5.13 eV and EA f levels are from -2.44 to -2.38 eV.
DOI: 10.1117/12.2306850
Hipersaite: http://spie.org/Publications/Proceedings/Paper/10.1117/12.2306850 
Atsauce Rudušs, A., Traskovskis, K., Otikova, E., Vembris, A., Grzibovskis, R., Lielbardis, M., Kokars, V. 3,3'-Bicarbazole Structural Derivatives as Charge Transporting Materials for Use in OLED Devices. Proceedings of SPIE, 2018, Vol.10687: Organic Electronics and Photonics: Fundamentals and Devices, 1068718-1.-1068718-8.lpp. ISSN 0277-786X. e-ISSN 1996-756X. Pieejams: doi:10.1117/12.2306850
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ID 27460