Prolonging Ultralong Organic Phosphorescence Lifetime to 2.5 s through Confining Rotation in Molecular Rotor

• DOI: 10.1002/adom.201800820
• Publication Date: 2019-02-26T06:15:22Z
• Authors: Mengping Li; Kun Ling; Huifang Shi; Nan Gan; Lulu Song; Suzhi Cai; Zhichao Cheng; Long Gu; Xuan Wang; Chaoqun Ma; Mingxing Gu; Qi Wu; Lifang Bian; Mingli Liu; Zhongfu An; Huili Ma; Wei Huang
• Keywords: 01 natural sciences; 0104 chemical sciences

Abstract Developing ultralong organic phosphorescence (UOP) materials has become a growing concern. To date, it remains formidable challenge to prolong the lifetime of under ambient conditions. A series fluoro‐substituted phenylboronic acid derivatives with UOP feature conditions is reported here. The 2,4‐difluorophenylboronic (24FBP) crystal up 2.50 s, which longest emission among single‐component pure phosphors. Combining experimental and theoretical study, upon stabilization triplet excitons by H‐aggregation, reasoned that rotation confinement in molecular rotors plays critical role prolonging lifetime. Given luminescence, 24FBP phosphor successfully applied anticounterfeiting. This result will pave way toward tuning expanding scope metal‐free phosphorescent luminescence their applications.