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.
Highlights
Organic light-emitting diodes (OLEDs) have been actively investigated in the last three decades since the first discovery by Tang and Vanslyke (1987) because of their incomparable advantages as they offer low power consumption, high brightness, color purity, light weight, large viewing angle, and flexible nature compared to other lighting sources
This study showed that the ortho-carbazole triarylboron compounds can satisfy the high efficiency of blue thermally activated delayed fluorescence (TADF) emitters
We summarized the boron-containing aromatic acceptor moieties connected with several donors of push–pull small molecules for blue TADF OLED applications
Summary
Organic light-emitting diodes (OLEDs) have been actively investigated in the last three decades since the first discovery by Tang and Vanslyke (1987) because of their incomparable advantages as they offer low power consumption, high brightness, color purity, light weight, large viewing angle, and flexible nature compared to other lighting sources. Third-generation OLEDs were demonstrated with 100% IQE by using the concept of thermally activated delayed fluorescence (TADF) process in pure organic materials (Uoyama et al, 2012) These TADF materials are promising to achieve high efficiency and color purity in the blue OLEDs. recently, many reports were published on blue TADF emitters based on different types of donor and acceptor design concepts (Liang et al, 2019). The OLED device showed a maximum EQE of 22.6% (or 24.1%) and CIE color coordinates of (0.139, 0.150) or (0.139, 0.198) depending on the thickness of indium tin oxide (ITO) They showed that spatially hindered ortho donor–acceptor skeleton is effective for achieving small EST and efficient TADF emitter. They inserted the boron atom into the closed ring system and connected the phenyl linker and donor in the para position They reported 10H-phenoxaborin acceptor-based blue TADF emitters containing carbazole and 9,9-. Acceptor is highlighted in dark red color
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