Issue 3, 2019

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

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

Article information

Article type
Paper
Submitted
11 nóv. 2018
Accepted
05 des. 2018
First published
08 des. 2018

J. Mater. Chem. C, 2019,7, 553-557

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, 7, 553 DOI: 10.1039/C8TC05677C

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