Efficient Triplet Exciton Fusion in Molecularly Doped Polymer Light-Emitting Diodes.
Published version
Peer-reviewed
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Repository DOI
Change log
Authors
Yang, L
Richter, JM
Meraldi, L
Altamimi, RM
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.
Description
Keywords
molecularly doped polymer OLEDs, singlet exciton fission, solid-state TTA upconversion, solution-processing, triplet exciton fusion
Journal Title
Advanced Materials
Conference Name
Journal ISSN
0935-9648
1521-4095
1521-4095
Volume Title
Publisher
Wiley
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Sponsorship
D.D. acknowledges the Department of Physics (University of Cambridge) and the KACST–Cambridge University Joint Centre of Excellence for financial support. L.Y. thanks the Singapore Agency for Science, Technology and Research (A*STAR) for a PhD studentship. The authors thank the Engineering and Physical Sciences Research Council (EPSRC) for financial support.