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High-efficiency stretchable light-emitting polymers from thermally activated delayed fluorescence

Journal Article · · Nature Materials
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  1. University of Chicago, IL (United States)
  2. Argonne National Laboratory (ANL), Argonne, IL (United States). Nanoscience and Technology Division
  3. Soochow University, Suzhou (China)
  4. Chinese Academy of Sciences (CAS), Changchun (China)
  5. University of Chicago, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States). Nanoscience and Technology Division
  6. University of Chicago, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Molecular Engineering
  7. University of Chicago, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States). Nanoscience and Technology Division; Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Molecular Engineering
Stretchable light-emitting materials are the key components for realizing skin-like displays and optical biostimulation. All the stretchable emitters reported to date, to the best of our knowledge, have been based on electroluminescent polymers that only harness singlet excitons, limiting their theoretical quantum yield to 25%. Here we present a design concept for imparting stretchability onto electroluminescent polymers that can harness all the excitons through thermally activated delayed fluorescence, thereby reaching a near-unity theoretical quantum yield. We show that our design strategy of inserting flexible, linear units into a polymer backbone can substantially increase the mechanical stretchability without affecting the underlying electroluminescent processes. As a result, our synthesized polymer achieves a stretchability of 125%, with an external quantum efficiency of 10%. Additionally, we demonstrate a fully stretchable organic light-emitting diode, confirming that the proposed stretchable thermally activated delayed fluorescence polymers provide a path towards simultaneously achieving desirable electroluminescent and mechanical characteristics, including high efficiency, brightness, switching speed and stretchability as well as low driving voltage.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Dutch Research Council; National Natural Science Foundation of China; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2349304
Journal Information:
Nature Materials, Journal Name: Nature Materials Journal Issue: 6 Vol. 22; ISSN 1476-1122
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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