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Review
. 2017 Sep 13;22(9):1522.
doi: 10.3390/molecules22091522.

Triarylborane-Based Materials for OLED Applications

Gulsen Turkoglu  1 , M Emin Cinar  2 , Turan Ozturk  3   4
Affiliations
Review

Triarylborane-Based Materials for OLED Applications

Gulsen Turkoglu et al. Molecules. .

Abstract

Multidisciplinary research on organic fluorescent molecules has been attracting great interest owing to their potential applications in biomedical and material sciences. In recent years, electron deficient systems have been increasingly incorporated into fluorescent materials. Triarylboranes with the empty p orbital of their boron centres are electron deficient and can be used as strong electron acceptors in conjugated organic fluorescent materials. Moreover, their applications in optoelectronic devices, energy harvesting materials and anion sensing, due to their natural Lewis acidity and remarkable solid-state fluorescence properties, have also been investigated. Furthermore, fluorescent triarylborane-based materials have been commonly utilized as emitters and electron transporters in organic light emitting diode (OLED) applications. In this review, triarylborane-based small molecules and polymers will be surveyed, covering their structure-property relationships, intramolecular charge transfer properties and solid-state fluorescence quantum yields as functional emissive materials in OLEDs. Also, the importance of the boron atom in triarylborane compounds is emphasized to address the key issues of both fluorescent emitters and their host materials for the construction of high-performance OLEDs.

Keywords: OLED; electroluminescence; fluorescence quantum yields; organic conjugated material; triarylborane.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Typical device configuration of OLEDs. “Reprinted (adapted) with permission from Li, Y.; Liu, J.-Y.; Zhao, Y-D.; Cao, Y.-C. Mater. Today 2017, 20, 258–266. Copyright 2017 Elsevier [1]”.
Figure 2
Figure 2
Three essential characteristic properties of boron atom for the molecular designs of new π-conjugated materials: (a) pπ-π* conjugation; (b) Lewis acidity; and (c) trigonal planar geometry.
Figure 3
Figure 3
Schematic demonstration of π-conjugated D–A systems containing triarylborane groups (a) in the main chain; (b) at the terminal positions and (c) as a pendant in the side chain.
Figure 4
Figure 4
Chemical structures of conjugated D–A type materials 1–8.
Figure 5
Figure 5
Triarylborane-based conjugated D–A type materials 9–15.
Figure 6
Figure 6
Triarylborane-based octupolar π-conjugated materials 16–20.
Figure 7
Figure 7
Triarylborane-based materials 21–37.
Figure 8
Figure 8
Carbazole possessing triarylborane-based materials 38–46.
Figure 9
Figure 9
Triarylborane-based florescent materials 47–60.
Figure 10
Figure 10
Triarylborane-based materials 61–65.
Figure 11
Figure 11
Triarylborane based phosphorescent materials 66–69.
Figure 12
Figure 12
Triarylborane-based TADF materials 70–78.
Figure 13
Figure 13
Triarylborane-substituted π-conjugated materials 79–81.
Figure 14
Figure 14
π-Conjugated materials 82–87 with Mes2B pendants.
Figure 15
Figure 15
π-Conjugated materials 88–93 with Mes2B pendants.
Figure 16
Figure 16
Triarylborane-substituted π-conjugated polymers P1–P9.
Figure 17
Figure 17
Triarylborane-based π-conjugated polymers P10–P17.
See this image and copyright information in PMC

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