Journal
LIQUID CRYSTALS
Volume 48, Issue 1, Pages 63-74Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2020.1765262
Keywords
Tri-carbazole liquid crystalline isomers; nematic mesophases; hole transport materials; solution-processed OLED
Funding
- Huaiyin Institute of Technology [Z301B19582]
- China Scholarship Council
- University of Hull
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Two structural isomers of alkyl-substituted tri-carbazoles were synthesized to investigate the impact of substitution pattern on their liquid crystalline behavior, conductivity, and performance in OLEDs. The isomer with a 2,7-disubstitution pattern exhibited high conductivity and efficiency in OLEDs, while the isomer with a 3,6-substitution pattern showed lower conductivity and poor performance in OLEDs due to the lack of observable liquid crystalline behavior.
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.
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