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Review
. 2020 May 19:8:373.
doi: 10.3389/fchem.2020.00373. eCollection 2020.

Recent Advancement in Boron-Based Efficient and Pure Blue Thermally Activated Delayed Fluorescence Materials for Organic Light-Emitting Diodes

Hyuna Lee  1 , Durai Karthik  1 , Raju Lampande  1 , Jae Hong Ryu  1 , Jang Hyuk Kwon  1
Affiliations
Review

Recent Advancement in Boron-Based Efficient and Pure Blue Thermally Activated Delayed Fluorescence Materials for Organic Light-Emitting Diodes

Hyuna Lee et al. Front Chem. .

Abstract

In the last few years, electron-deficient materials have been actively researched for application in organic light-emitting diode (OLED) as dopant and electron-transporting materials. The boron-containing materials are interesting as they give good emissive properties in solid state with an electron-accepting character. Recently, many boron-containing materials are used as emissive materials for thermally activated delayed fluorescence (TADF) OLED applications. In this review, boron acceptor-based push-pull small molecules used for application in blue TADF OLEDs are reviewed, covering their different types of acceptor, molecular design, structure-property relation, material properties, and device properties. Also, the importance of boron acceptors to address the key issue of blue TADF OLEDs is discussed.

Keywords: blue organic light-emitting diode (OLED); boron acceptor; electroluminescence; multiple resonance; thermally activated delayed fluorescence (TADF).

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Figures

Figure 1
Figure 1
General configuration of pz-π conjugation of B–C atoms in the organic conjugated systems.
Figure 2
Figure 2
Reported unbridged boron acceptor for blue thermally activated delayed fluorescence (TADF) emitters. In this molecular design, acceptor is highlighted in dark red color.
Figure 3
Figure 3
Reported partially bridged boron acceptor for blue thermally activated delayed fluorescence (TADF) emitters. In these molecules, acceptor is highlighted in dark green color.
Figure 4
Figure 4
Reported partially bridged boron acceptor for blue thermally activated delayed fluorescence (TADF) emitters. In these molecules, the acceptor is highlighted in blue and yellow color.
Figure 5
Figure 5
Reported partially bridged boron acceptors for blue thermally activated delayed fluorescence (TADF) emitters. In these molecules, acceptor is highlighted in purple color.
Figure 6
Figure 6
Reported structures of blue thermally activated delayed fluorescence (TADF) emitters using oxygen-based fully bridged boron acceptor and different donors.
Figure 7
Figure 7
Reported structures of blue thermally activated delayed fluorescence (TADF) emitters using oxygen-based fully bridged boron acceptor and different donors.
Figure 8
Figure 8
Reported structures of blue thermally activated delayed fluorescence (TADF) emitters using donor units attached to the different positions of the boron-based acceptor.
Figure 9
Figure 9
Reported structures of multiple resonance (MR)-thermally activated delayed fluorescence (TADF)-based materials for blue TADF.
See this image and copyright information in PMC

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