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Trap-induced conversion from singlet fission to intersystem crossing via in situ heating of rubrene-based organic light-emitting diodes

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Abstract

An in situ heating method was used to investigate the effect of high temperature on the magneto-electroluminescence (MEL) of rubrene-based organic light-emitting diodes. The change of MEL indicated that the microscopic mechanism of the device converted from singlet fission (SF) to intersystem crossing (ISC) at 380 K. Analysis of the surface morphology, electroluminescence spectrum, and current–voltage curve of the device suggested that the SF-to-ISC conversion was caused by a large number of exciton traps generated in the organic layers of the device. These traps blocked the movement of excitons, which suppressed SF. By contrast, ISC was promoted by traps and became the main process. This work provides a detailed investigation of the dynamics of exciton evolution and deepens our understanding of electron–hole interaction mechanisms in organic devices at high temperature.

Graphical abstract: Trap-induced conversion from singlet fission to intersystem crossing via in situ heating of rubrene-based organic light-emitting diodes

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Publication details

The article was received on 11 Nov 2018, accepted on 05 Dec 2018 and first published on 08 Dec 2018


Article type: Paper
DOI: 10.1039/C8TC05677C
Citation: J. Mater. Chem. C, 2019, Advance Article
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    Trap-induced conversion from singlet fission to intersystem crossing via in situ heating of rubrene-based organic light-emitting diodes

    H. Zhu, W. Jia, L. Chen, X. Tang, Y. Hu, R. Pan, J. Deng and Z. Xiong, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C8TC05677C

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