Efficient narrowband electroluminescence based on a hetero-bichromophore thermally activated delayed fluorescence dyad. Issue 12 (4th March 2022) - Yu, You-Jun
Abstract : A hetero-bichromophore thermally activated delayed fluorescence (TADF) emitter named BOQAO was designed and synthesized, which consists of two multi-resonance TADF (MR-TADF) cores, t BuBO and t BuQAO. Abstract : A hetero-bichromophore thermally activated delayed fluorescence (TADF) emitter named BOQAO was designed and synthesized, which consists of two multi-resonance TADF (MR-TADF) cores, t BuBO and t BuQAO. The short-range intramolecular charge transfer (ICT) characteristics of t BuBO and t BuQAO weaken its electron-donating and electron-withdrawing ability, respectively. Thus, weak long-range ICT from t BuBO to t BuQAO is established in BOQAO for holding blue fluorescence emission with a slight redshift, keeping a small FWHM, and maintaining the TADF properties, simultaneously. The simple doped devices exhibited high color purity with FWHMs of less than 35 nm in a wide doping ratio range from 1 wt% to 40 wt%. At a 5 wt% doping ratio, the device based on BOQAO exhibited the best device performance with an EQE of 21.8% and an FWHM of 32 nm. This work provides a simple and practical strategy for suppressing aggregation-induced spectral broadening for the development of MR-TADF.