Intramolecular charge transfer effect for highly efficient deep red and near infrared thermally activated delayed fluorescence
Chen‐Zong Yang, Ze‐Hui Pan, Kai Zhang, Jing‐Wen Tai, Chuan‐Kui Wang, Lei Ding, Man‐Keung Fung, Jian Fan
Abstract
the introduction of multiple sub-acceptor units, thereby narrowing the bandgap. In this work, the intramolecular charge transfer (ICT) effect was applied for the development of acceptor units to achieve efficient DR/NIR TADFs. The ICT effect within the acceptor unit enhanced the π-electron delocalization, lowered the LUMO and redshifted the emission wavelength. In addition, the fusion of the donor unit into the planar acceptor skeleton rigidified the molecular structure and reduced the non-radiative decay. This proof-of-concept study demonstrated that ICT is an undoubtedly effective strategy for the rational design of efficient DR/NIR TADFs.