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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.
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]
Copyright of Liquid Crystals is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 148751500
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: A novel nematic tri-carbazole as a hole-transport material for solution-processed OLEDs.
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  Data: <searchLink fieldCode="AR" term="%22Hu%2C+Guang%22">Hu, Guang</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> guanghu2019@hyit.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Kitney%2C+Stuart+P%2E%22">Kitney, Stuart P.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> stuart.kitney@npl.co.uk</i><br /><searchLink fieldCode="AR" term="%22Billa%2C+Muralidhar+Reddy%22">Billa, Muralidhar Reddy</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kelly%2C+Stephen+M%2E%22">Kelly, Stephen M.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> s.m.kelly@hull.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Lambert%2C+Brian%22">Lambert, Brian</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Harrison%2C+William%22">Harrison, William</searchLink><relatesTo>3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Liquid+Crystals%22">Liquid Crystals</searchLink>. Jan2021, Vol. 48 Issue 1, p63-74. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Organic+light+emitting+diodes%22">Organic light emitting diodes</searchLink><br /><searchLink fieldCode="DE" term="%22Molecular+shapes%22">Molecular shapes</searchLink><br /><searchLink fieldCode="DE" term="%22Carbazole%22">Carbazole</searchLink><br /><searchLink fieldCode="DE" term="%22Structural+isomers%22">Structural isomers</searchLink><br /><searchLink fieldCode="DE" term="%22Magnitude+%28Mathematics%29%22">Magnitude (Mathematics)</searchLink><br /><searchLink fieldCode="DE" term="%22Materials%22">Materials</searchLink>
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  Data: 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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  Data: <i>Copyright of Liquid Crystals is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.1080/02678292.2020.1765262
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      – Code: eng
        Text: English
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        PageCount: 12
        StartPage: 63
    Subjects:
      – SubjectFull: Organic light emitting diodes
        Type: general
      – SubjectFull: Molecular shapes
        Type: general
      – SubjectFull: Carbazole
        Type: general
      – SubjectFull: Structural isomers
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      – SubjectFull: Magnitude (Mathematics)
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      – SubjectFull: Materials
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      – TitleFull: A novel nematic tri-carbazole as a hole-transport material for solution-processed OLEDs.
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            NameFull: Hu, Guang
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            NameFull: Kitney, Stuart P.
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            NameFull: Billa, Muralidhar Reddy
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            NameFull: Kelly, Stephen M.
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              M: 01
              Text: Jan2021
              Type: published
              Y: 2021
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              Value: 48
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