A modular approach to efficient thermally activated delayed fluorescence from metal-perturbed intraligand charge-transfer excited state of Au(I) complexes

Yang, Jian-Gong1,2; Feng, Xingyu1; Xie, Guohua3; Li, Nengquan1; Li, Jiayu4; Song, Xiu-Fang1; Li, Ming-De4; Zhang, Jingling1; Chang, Xiaoyong5; Li, Kai1

2024-08-01

10.1007/s11426-024-2026-2

SCIENCE CHINA-CHEMISTRY   影响因子和分区

1674-7291

1869-1870

The efficient harvesting of triplet excitons is crucial to the realization of high-performance organic light-emitting diodes (OLEDs). Herein, we show that coordination of donor-acceptor (D-A) type molecules to a metal atom in a monodentate fashion can lead to thermally activated delayed fluorescence (TADF) emissions with wide color tunability only through varying the non-coordinating acceptor moiety. A panel of TADF gold(I) complexes with emission maxima (lambda max) of 545-645 nm from metal perturbed intraligand charge-transfer (MPICT) excited states have been developed. Synergetic effects of heavy atom-induced spin-orbit coupling (SOC), steric-induced donor-acceptor twisting and suppressed intramolecular motions lead to high emission efficiencies of 65%-85% in doped films with delayed fluorescence lifetime of as short as 2.0 mu s. Transient absorption spectroscopic studies on selected complexes determined the kISC to be 6.5 x 109 s-1. Theoretical calculations confirmed the participation of minor d orbital into the lowest excited state, which led to an SOC value of 5.19 cm-1 between the lowest-lying singlet and triplet excited states. The yellow to deep red solution-processed OLEDs based on the new gold(I) complexes incorporated with various D-A ligands demonstrated promising performances. This study validates a modular design for TADF metal complexes, which will broaden the choices of metal centers and allow for facile color tuning via simple ligand synthesis.

gold(I) complex OLED thermally activated delayed fluorescence (TADF) MPICT

SCI ; EI

英语

其他

National Natural Science Foundation of China["22322505","22271196","22301226"] ; Shenzhen Science and Technology Program[ZDSYS20210623091813040] ; Department of Science and Technology of Guangdong Province[2019QN01C617]

Chemistry

Chemistry, Multidisciplinary

WOS:001287409200001

SCIENCE PRESS

Web of Science

1.Shenzhen Univ, Coll Mat Sci & Engn, Guangdong Prov Key Lab New Energy Mat Serv Safety, Shenzhen Key Lab New Informat Display & Storage Ma, Shenzhen 518055, Peoples R China
2.Wuhan Text Univ, Dept Chem & Chem Engn, Hubei Key Lab Biomass Fibers & Ecodyeing & Finishi, Wuhan 430200, Peoples R China
3.Xiamen Univ, Inst Flexible Elect Future Technol, Xiamen 361005, Peoples R China
4.Shantou Univ, Dept Chem, Key Lab Preparat & Applicat Ordered Struct Mat Gua, Shantou 515031, Peoples R China
5.Southern Univ Sci & Technol, Dept Chem, Shenzhen 518055, Peoples R China

Yang, Jian-Gong,Feng, Xingyu,Xie, Guohua,et al. A modular approach to efficient thermally activated delayed fluorescence from metal-perturbed intraligand charge-transfer excited state of Au(I) complexes[J]. SCIENCE CHINA-CHEMISTRY,2024.

Yang, Jian-Gong.,Feng, Xingyu.,Xie, Guohua.,Li, Nengquan.,Li, Jiayu.,...&Li, Kai.(2024).A modular approach to efficient thermally activated delayed fluorescence from metal-perturbed intraligand charge-transfer excited state of Au(I) complexes.SCIENCE CHINA-CHEMISTRY.

Yang, Jian-Gong,et al."A modular approach to efficient thermally activated delayed fluorescence from metal-perturbed intraligand charge-transfer excited state of Au(I) complexes".SCIENCE CHINA-CHEMISTRY (2024).