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Proceedings Paper

3,3'-Bicarbazole structural derivatives as charge transporting materials for use in OLED devices
Author(s): Armands Ruduss; Kaspars Traskovskis; Elina Otikova; Aivars Vembris; Raitis Grzibovskis; Marcis Lielbardis; Valdis Kokars
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Paper Abstract

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 FeCl3 was employed in the synthesis of 3,3′-bicarbazole compounds. Different derivatives of 3,3′-bicarbazole with 4-ethoxyphenyland 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)methylsubstituents 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 cm2/V·s. Molecule ionization (If) levels and electron affinity (EAf) levels in thin films were determined using photoelectric effect experiment. Depending on the nature of substituents at 6,6′- and 9,9′- positions If levels range from -5.19 to -5.13 eV and EAf levels are from -2.44 to -2.38 eV.

Paper Details

Date Published: 22 May 2018
PDF: 8 pages
Proc. SPIE 10687, Organic Electronics and Photonics: Fundamentals and Devices, 1068718 (22 May 2018); doi: 10.1117/12.2306850
Show Author Affiliations
Armands Ruduss, Riga Technical Univ. (Latvia)
Kaspars Traskovskis, Riga Technical Univ. (Latvia)
Elina Otikova, Riga Technical Univ. (Latvia)
Aivars Vembris, Univ. of Latvia (Latvia)
Raitis Grzibovskis, Univ. of Latvia (Latvia)
Marcis Lielbardis, Univ. of Latvia (Latvia)
Valdis Kokars, Riga Technical Univ. (Latvia)

Published in SPIE Proceedings Vol. 10687:
Organic Electronics and Photonics: Fundamentals and Devices
Sebastian Reineke; Koen Vandewal, Editor(s)

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