Facile dimerization strategy for producing narrowband green multi-resonance delayed fluorescence emitters

Abstract

Establishing a simple molecular design strategy for enabling redshifted emissions while maintaining high color purity in multi-resonance thermally activated delayed fluorescence (MR-TADF) remains a crucial yet challenging task. Herein, we...

Organoboron-based multiple-resonance emitters: synthesis, structure–property correlations, and prospects

“…116,130,131,133,168,169 DOBNA and CzBN derivatives bearing boronic ester groups, which engage in Suzuki–Miyaura coupling with aryl halides, can be synthesised from brominated derivatives via Miyaura–Ishiyama borylation or iridium-catalysed direct aromatic C–H (Hartwig–Miyaura) borylation (Scheme 40). 118,135,185,259–261 An asymmetric bridge with N and O atoms was also demonstrated. 95…”

“…13, 14 and Tables 13, 14). 172–187 Although a methoxy group was deprotected by BBr 3 in the one-pot borylation procedure (Scheme 4), the methylthio (SMe) group was preserved under the same conditions ( BN(p)SCH 3 , Fig. 13).…”

Recent progress and prospects of fluorescent materials based on narrow emission

“…6n), by a facile dimerization strategy. 71 In a deoxygenated toluene solution, both p -CzB and m -CzB exhibited pure green emissions at 505 and 515 nm with narrow spectral FWHMs of 34 and 35 nm, respectively. The Δ E ST values of p -CzB and m -CzB were determined to be 0.17 and 0.13 eV, respectively.…”

Neoteric Advances in Oxygen Bridged Triaryl Boron‐based Delayed Fluorescent Materials for Organic Light Emitting Diodes

“…Among the reported boron based acceptors, the fully fused oxygen bridged triarylboron, 5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene (DOBNA) attracted significant attention because of its unique properties such as multi-resonance feature, rigid molecular structure, narrowband emission, and excellent TADF characteristics (Figure 3). [52][53][54][55][56][86][87][88][89] Consequently, numerous DOB-NA-based TADF emitters have been developed by adopting different molecular designs and achieved very high EQE. However, these materials often displayed severe efficiency rolloff and poor operational stability, which needs to be addressed from the molecular design perspective.…”