A novel nematic tri-carbazole as a hole-transport material for solution-processed OLEDs.
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| Title: | A novel nematic tri-carbazole as a hole-transport material for solution-processed OLEDs. |
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| Authors: | Hu, Guang1,2 (AUTHOR) guanghu2019@hyit.edu.cn, Kitney, Stuart P.3 (AUTHOR) stuart.kitney@npl.co.uk, Billa, Muralidhar Reddy2 (AUTHOR), Kelly, Stephen M.2 (AUTHOR) s.m.kelly@hull.ac.uk, Lambert, Brian3 (AUTHOR), Harrison, William3 (AUTHOR) |
| Source: | Liquid Crystals. Jan2021, Vol. 48 Issue 1, p63-74. 12p. |
| Subjects: | Organic light emitting diodes, Molecular shapes, Carbazole, Structural isomers, Magnitude (Mathematics), Materials |
| Abstract: | Two structural isomers of alkyl-substituted tri-carbazoles were synthesised to study the effect of the substitution pattern on their liquid crystalline behaviour and conductivity and performance in test OLEDs. The isomer with a 2,7-disubstitution pattern in the central carbazole exhibits a monotropic nematic phase, a high conductivity up to 10 Cd A−1 and is suitable as a hole-transport material for solution-processed OLEDs, achieving a high efficiency. The tri-carbazole isomer with a 3,6-substitution pattern, in the central carbazole, does not exhibit observable liquid crystalline behaviour, exhibits conductivity values two orders of magnitude lower than that of its 2,7-disubstituted isomer and performs poorly in OLEDs with the same configuration. Two structural isomers of alkyl-substituted tri-carbazoles A and B exhibit significantly different liquid crystalline behaviour, conductivity and performance in test OLEDs dependent upon their molecular shape. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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