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Adv Mater. 2017 Apr;29(13). doi: 10.1002/adma.201605987. Epub 2017 Feb 01.

Efficient Triplet Exciton Fusion in Molecularly Doped Polymer Light-Emitting Diodes.

Advanced materials (Deerfield Beach, Fla.)

Dawei Di, Le Yang, Johannes M Richter, Lorenzo Meraldi, Rashid M Altamimi, Ahmed Y Alyamani, Dan Credgington, Kevin P Musselman, Judith L MacManus-Driscoll, Richard H Friend

Affiliations

  1. Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, UK.
  2. King Abudulaziz City for Science and Technology, Riyadh, 12371, Saudi Arabia.
  3. Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada.
  4. Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS, UK.

PMID: 28145598 DOI: 10.1002/adma.201605987

Abstract

Solution-processed polymer organic light-emitting diodes (OLEDs) doped with triplet-triplet annihilation (TTA)-upconversion molecules, including 9,10-diphenylanthracene, perylene, rubrene and TIPS-pentacene, are reported. The fraction of triplet-generated electroluminescence approaches the theoretical limit. Record-high efficiencies in solution-processed OLEDs based on these materials are achieved. Unprecedented solid-state TTA-upconversion quantum yield of 23% (TTA-upconversion reaction efficiency of 70%) at electrical excitation well below one-sun equivalent is observed.

© 2017 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords: molecularly doped polymer OLEDs; singlet exciton fission; solid-state TTA upconversion; solution-processing; triplet exciton fusion

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