期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 -, 期 -, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202316647
关键词
Amorphous Phosphorescent Film; Encryption; Organic Room-Temperature Phosphorescence; Ultra-Long Lifetimes; Visible-Light Excitation
A general and rational molecular-design strategy has been developed to enable visible-light excited ultra-long room-temperature phosphorescence (UL-RTP). The multi-esterification strategy boosts transition dipole moments, leading to the most efficient UL-RTP in flexible films upon excitation with blue light, which allows high-tech applications in time-delayed white LEDs and flashlight-activated afterglow encryption.
The development of ultra-long room-temperature phosphorescence (UL-RTP) in processable amorphous organic materials is highly desirable for applications in flexible displays, anti-counterfeiting, and bio-imaging. However, achieving efficient UL-RTP from amorphous materials remains a challenging task, especially with activation by visible light and a bright afterglow. Here we report a general and rational molecular-design strategy to enable efficient visible-light-excited UL-RTP by multi-esterification of a rigid large-plane phosphorescence core. Notably, multi-esterification minimizes the aggregation-induced quenching and accomplishes a ' four birds with one stone ' possibility in the generation and radiation process of UL-RTP: i) shifting the excitation from ultraviolet light to blue-light through enhancing the transition dipole moment of low-lying singlet-states, ii) facilitating the intersystem crossing process through the incorporation of lone-pair electrons, iii) boosting the decay process of long-lived triplet excitons resulting from a significantly increased transition dipole moment, and iv) reducing the intrinsic triplet nonradiative decay by substitution of high-frequency vibrating hydrogen atoms. All these factors synergistically contribute to the most efficient and stable visible-light-stimulated UL-RTP (lifetime up to 2.01 s and efficiency up to 35.4 % upon excitation at 450 nm) in flexible films using multi-esterified coronene, which allows high-tech applications in single-component time-delayed white light-emitting diodes and information technology based on flashlight-activated afterglow encryption. A general and rational molecular-design strategy has been developed to enable visible-light excited ultra-long room-temperature phosphorescence (UL-RTP). The multi-esterification strategy boosts transition dipole moments, leading to the most efficient UL-RTP in flexible films upon excitation with blue light, which allows high-tech applications in time-delayed white LEDs and flashlight-activated afterglow encryption.image
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