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Generating Light from Upper Excited Triplet States: A Contribution to the Indirect Singlet Yield of a Polymer OLED, Helping to Exceed the 25% Singlet Exciton Limit

Jankus, Vygintas; Aydemir, Murat; Dias, Fernando B.; Monkman, Andrew P.

Generating Light from Upper Excited Triplet States: A Contribution to the Indirect Singlet Yield of a Polymer OLED, Helping to Exceed the 25% Singlet Exciton Limit Thumbnail


Authors

Vygintas Jankus

Murat Aydemir



Abstract

The mechanisms by which light is generated in an organic light emitting diode have slowly been elucidated over the last ten years. The role of triplet annihilation has demonstrated how the “spin statistical limit” can be surpassed, but it cannot account for all light produced in the most efficient devices. Here, a further mechanism is demonstrated by which upper excited triplet states can also contribute to indirect singlet production and delayed fluorescence. Since in a device the population of these TN states is large, this indirect radiative decay channel can contribute a sizeable fraction of the total emission measured from a device. The role of intra- and interchain charge transfer states is critical in underpinning this mechanism.

Citation

Jankus, V., Aydemir, M., Dias, F. B., & Monkman, A. P. (2016). Generating Light from Upper Excited Triplet States: A Contribution to the Indirect Singlet Yield of a Polymer OLED, Helping to Exceed the 25% Singlet Exciton Limit. Advanced Science, 3(1), Article 1500221. https://doi.org/10.1002/advs.201500221

Journal Article Type Article
Acceptance Date Nov 10, 2015
Online Publication Date Dec 12, 2015
Publication Date Jan 13, 2016
Deposit Date Feb 1, 2016
Publicly Available Date Feb 1, 2016
Journal Advanced Science
Publisher Wiley Open Access
Peer Reviewed Peer Reviewed
Volume 3
Issue 1
Article Number 1500221
DOI https://doi.org/10.1002/advs.201500221
Keywords Charge transfer states, Delayed fluorescence, OLED, Reverse intersystem crossing, Triplet fusion, Triplet–triplet annihilation.

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Published Journal Article (434 Kb)
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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
© 2015 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.







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