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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 and Aydemir, Murat and Dias, Fernando B. and Monkman, Andrew 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). p. 1500221.

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.

Item Type:Article
Keywords:Charge transfer states, Delayed fluorescence, OLED, Reverse intersystem crossing, Triplet fusion, Triplet–triplet annihilation.
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1002/advs.201500221
Publisher 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.
Date accepted:10 November 2015
Date deposited:01 February 2016
Date of first online publication:12 December 2015
Date first made open access:No date available

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