Recent endeavors and perspectives in developing solution-processable host materials for thermally activated delayed fluorescence organic light-emitting diodes

Abstract

Solution-processable thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs) have attracted increasing attention in academia and industry owing to their feasibility for fabricating large-area and flexible devices. Solution-processable devices...

Bicarbazole-Benzophenone-Based Twisted Donor-Acceptor-Donor Derivatives as Blue Emitters for Highly Efficient Fluorescent Organic Light-Emitting Diodes

“…Despite their significance, the development of blue OLEDs has posed persistent challenges owing to the inherent instability of blue-emitting materials [ 10 , 11 , 12 ]. Recent research efforts have resulted in notable progress in the domain of promising host derivatives for the blue devices, offering promising avenues to overcome the efficiency limitations and reaching high internal quantum efficiency [ 13 , 14 , 15 , 16 ]. Simultaneously, scientists and engineers have made noteworthy strides in the creation of novel organic emitters tailored for blue OLEDs [ 17 , 18 , 19 ].…”

Unveiling the potential of nonconjugate linkers (sp3-cores) in through-space charge transfer emitters and host materials for thermally activated delayed fluorescence organic light emitting diodes

“…The emitters need to be doped into a compatible host material to prevent concentration quenching and triplet–triplet annihilations. 82,83 The host material must possess high triplet energy to prevent back-energy transfer from the emitter to the host, along with a suitable HOMO and LUMO for efficient energy transfer. High and balanced hole and electron mobilities (bipolar hosts) are crucial for complete charge recombination in emissive materials.…”

Bicarbazole-Benzophenone Based Twisted D-A-D Derivatives as Blue Emitters for Highly Efficient Fluorescent OLEDs

“…Despite their significance, the development of blue OLEDs has posed persistent challenges owing to the inherent instability of blue-emitting materials [9]. Recent research efforts have resulted in notable progress in the domain of solution-processable host materials for blue OLEDs, offering promising avenues to overcome the efficiency limitations observed in conventional fluorescent OLEDs and reached nearly perfect internal quantum efficiency [9,10]. This research thrust encompasses a multifaceted approach to address key challenges in designing high-performance host materials, with a particular emphasis on optimizing efficiency, ensuring long-term stability and enabling solution-based fabrication processes [10].…”

“…Recent research efforts have resulted in notable progress in the domain of solution-processable host materials for blue OLEDs, offering promising avenues to overcome the efficiency limitations observed in conventional fluorescent OLEDs and reached nearly perfect internal quantum efficiency [9,10]. This research thrust encompasses a multifaceted approach to address key challenges in designing high-performance host materials, with a particular emphasis on optimizing efficiency, ensuring long-term stability and enabling solution-based fabrication processes [10]. Simultaneously, scientists and engineers have made noteworthy strides in the creation of novel organic emitters tailored for narrow-band deep blue OLEDs [11].…”

“…As research continues to advance, the pursuit of innovative materials and tailored design strategies holds the promise of propelling blue OLED technology to even greater heights. [9][10][11][12][13][14] In this research article, we have designed a group of twisted D-A-D derivatives incorporating bicarbazole and benzophenone fragments that have been developed for potential use as blue emitters in OLEDs. These derivatives include 4,4'-bis(9'-butyl-[3,3']bicarbazol-9-yl)benzophenone (DB14), 4,4'-bis(9'-{2-ethylhexyl}-[3,3']-bicarbazol-9-yl)benzophenone (DB23) and 4,4'-bis(9'-octyl-[3,3']-bicarbazol-9-yl)benzophenone (DB29).…”