Issue 28, 2023

Frequency-triggered circuit transition in organic light-emitting diodes probed by impedance spectroscopy

Abstract

We demonstrate frequency-triggered internal circuit transition in high-performance organic light-emitting diodes. Blue fluorescent light-emitting devices are fabricated based on a stable and efficient host-dopant material system. Broad-band impedance spectroscopy reveals that these diodes systematically undergo two abrupt spectral transitions at two bands of small-signal frequencies. Nyquist plots recorded over a wide range of conditions are fitted to an equivalent circuit model, decoupling the key interface and bulk parameters. The sharp conductance increases identified from this procedure are conceptually linked to the trap deactivation at specific cut-off frequencies, suggesting new opportunities for alternating-current applications of organic light-emitting diodes.

Graphical abstract: Frequency-triggered circuit transition in organic light-emitting diodes probed by impedance spectroscopy

Supplementary files

Article information

Article type
Paper
Submitted
03 Api. 2023
Accepted
15 Eka. 2023
First published
15 Eka. 2023

J. Mater. Chem. C, 2023,11, 9670-9677

Frequency-triggered circuit transition in organic light-emitting diodes probed by impedance spectroscopy

J. H. Park, Y. J. Shin, I. Kymissis, Y. Jeon and C. Kim, J. Mater. Chem. C, 2023, 11, 9670 DOI: 10.1039/D3TC01171B

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