We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Thermally Activated Delayed Fluorescence in an Organic Cocrystal: Narrowing the Singlet–Triplet Energy Gap via Charge Transfer.
- Authors
Sun, Lingjie; Hua, Weijie; Liu, Yang; Tian, Guangjun; Chen, Mingxi; Chen, Mingxing; Yang, Fangxu; Wang, Shufeng; Zhang, Xiaotao; Luo, Yi; Hu, Wenping
- Abstract
Harvesting non‐emissive spin‐triplet charge‐transfer (CT) excitons of organic semiconductors is fundamentally important for increasing the operation efficiency of future devices. Here we observe thermally activated delayed fluorescence (TADF) in a 1:2 CT cocrystal of trans‐1,2‐diphenylethylene (TSB) and 1,2,4,5‐tetracyanobenzene (TCNB). This cocrystal system is characterized by absorption spectroscopy, variable‐temperature steady‐state and time‐resolved photoluminescence spectroscopy, single‐crystal X‐ray diffraction, and first‐principles calculations. These data reveal that intermolecular CT in cocrystal narrows the singlet–triplet energy gap and therefore facilitates reverse intersystem crossing (RISC) for TADF. These findings open up a new way for the future design and development of novel TADF materials.
- Subjects
DELAYED fluorescence; SINGLET state (Quantum mechanics); BAND gaps; CHARGE transfer; ORGANIC semiconductors; TIME-resolved spectroscopy
- Publication
Angewandte Chemie, 2019, Vol 131, Issue 33, p11433
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201904427