Premium
Resonance‐Activated Spin‐Flipping for Efficient Organic Ultralong Room‐Temperature Phosphorescence
Author(s) -
Tao Ye,
Chen Runfeng,
Li Huanhuan,
Yuan Jie,
Wan Yifang,
Jiang He,
Chen Cailin,
Si Yubing,
Zheng Chao,
Yang Baocheng,
Xing Guichuan,
Huang Wei
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201803856
Subject(s) - intersystem crossing , phosphorescence , materials science , resonance (particle physics) , exciton , organic electronics , excited state , spin (aerodynamics) , molecule , triplet state , optoelectronics , heteroatom , singlet state , chemical physics , nanotechnology , atomic physics , condensed matter physics , physics , chemistry , fluorescence , optics , ring (chemistry) , organic chemistry , transistor , voltage , quantum mechanics , thermodynamics
Triplet‐excited‐state‐involved photonic and electronic properties have attracted tremendous attention for next‐generation technologies. To populate triplet states, facile intersystem crossing (ISC) for efficient exciton spin‐flipping is crucial, but it remains challenging in organic molecules free of heavy atoms. Here, a new strategy is proposed to enhance the ISC of purely organic optoelectronic molecules using heteroatom‐mediated resonance structures capable of promoting spin‐flipping at large singlet–triplet splitting energies with the aid of the fluctuation of the state energy and n‐orbital component upon self‐adaptive resonance variation. Combined experimental and theoretical investigations confirm the key contributions of the resonance variation to the profoundly promoted spin‐flipping with ISC rate up to ≈10 7 s −1 in the rationally designed NPX (X = O or S) resonance molecules. Importantly, efficient organic ultralong room‐temperature phosphorescence (OURTP) with simultaneously elongated lifetime and improved efficiency results overcoming the intrinsic competition between the OURTP lifetime and efficiency. With the spectacular resonance‐activated OURTP molecules, time‐resolved and color‐coded quick response code devices with multiple information encryptions are realized, demonstrating the fundamental significance of this approach in boosting ISC dynamically for advanced optoelectronic applications.