Access to tetracoordinate boron-doped polycyclic aromatic hydrocarbons with delayed fluorescence and aggregation-induced emission under mild conditions

Abstract

A series of tetracoordinate boron-doped polycyclic aromatic hydrocarbons have been synthesized under mild conditions, featuring delayed fluorescence and aggregation-induced emission.

Double boron-embedded multiresonant thermally activated delayed fluorescent materials for organic light-emitting diodes

“…There are two types mainly utilized for the synthesis of the DB-MR-TADF emitters. These are (i) BuLi-based tandem borylation using Hunig base; (ii) One shot double borylation by using BBr 3 / BI 3 and reducing aromatic solvents 49,[83][84][85][86][87][88][89][90] . In type-1, under the inert atmosphere in the reducing solvents, the halogen will be replaced by using lithiation, and then transmetalation was done by using BBr 3 with the temperature controls [90][91][92][93] .…”

Multiple-boron–nitrogen (multi-BN) doped π-conjugated systems for optoelectronics

“…Doping four-coordinated boron atoms into π-conjugated systems could markedly decrease the LUMO level and increase the electron affinity, which is also true for π-conjugated systems consisting of 6-membered BN-chelate units. 192,208,209 In the subsection, we will focus on molecules with exceptionally low LUMO levels in different applications.…”

Wide-range color-tunable polycyclo-heteraborin multi-resonance emitters containing B–N covalent bonds

“…26 This work not only provides a new family of MR BN-PAHs with facile synthesis procedures free of lithium reagents and with high yields, but also provides an opportunity to finely manipulate the electronic structures of BN-PAHs through B–N covalent bonds, which may uncover unforeseen optoelectronic properties. 27–30 However, at this initial stage, the performance of B–N embedded emitters still lags far behind their classical B,N-PAH counterparts. For instance, the FWHMs of those emitters are still larger than the cutting-edge values of B,N-MR emitters and they still need to demonstrate their color tunability for full-color emission.…”