2020/11/23 by Xueqi Wang, Xue‐Qi Wang, Shengyi Yang +7 · 21 citations
Chemistry · Engineering · Materials Science · #Acceptor #Atomic physics #Chemistry #Excited state #Fluorescence #Intersystem crossing #Luminescence and Fluorescent Materials #Materials science #Moiety #Molecule #Optics #Optoelectronics #Organic Electronics and Photovoltaics #Organic Light-Emitting Diodes Research #Photochemistry #Photoluminescence #Physics #Singlet state #Stereochemistry
paper · doi:10.1002/ange.202011384
published in Angewandte Chemie 133(10), 5273-5279 (Wiley)
openalex publication_date 2020/11/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Abstract Multi‐layer π‐stacked emitters based on spatially confined donor/acceptor/donor (D/A/D) patterns have been developed to achieve high‐efficiency thermally activated delayed fluorescence (TADF). In this case, dual donor moieties and a single acceptor moiety are introduced to form two three‐dimensional (3D) emitters, DM‐BD1 and DM‐BD2, which rely on spatial charge transfer (CT). Owing to the enforced face‐to‐face D/A/D pattern, effective CT interactions are realized, which lead to high photoluminescence quantum yields (PLQYs) of 94.2 % and 92.8 % for the two molecules, respectively. The resulting emitters exhibit small singlet–triplet energy splitting (Δ E ST ) and fast reverse intersystem crossing (RISC) processes. Maximum external quantum efficiencies (EQEs) of 28.0 % and 26.6 % were realized for devices based on DM‐BD1 and DM‐BD2, respectively, which are higher than those of their D/A‐type analogues.