Visualizing electroluminescence process in light-emitting electrochemical cells

Visualizing electroluminescence process in light-emitting electrochemical cells

Electroluminescence occurs via recombination reactions between electrons and holes, but these processes have not been directly evaluated. Here, we explore the operation dynamics of ionic liquid-based light-emitting electrochemical cells (LECs) with stable electroluminescence by multi-timescale spect...

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Bibliographic Details
Published in:Nature communications Vol. 14; no. 1; p. 992
Main Authors: Yasuji, Kosuke, Sakanoue, Tomo, Yonekawa, Fumihiro, Kanemoto, Katsuichi
Format: Journal Article
Language:English
Published: London Nature Publishing Group UK 01-03-2023
Nature Publishing Group
Nature Portfolio
Subjects:
639/301/1005/1007
639/624/1020/1091
Bias
Chemical reactions
Doping
Dynamics
Electrochemical cells
Electrochemistry
Electroluminescence
Electrons
Evaluation
Humanities and Social Sciences
Injection
Ionic liquids
Ions
Measuring instruments
Modulation
multidisciplinary
Recombination
Recombination reactions
Science
Science (multidisciplinary)
Spectroscopy
Spectrum analysis
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Summary:Electroluminescence occurs via recombination reactions between electrons and holes, but these processes have not been directly evaluated. Here, we explore the operation dynamics of ionic liquid-based light-emitting electrochemical cells (LECs) with stable electroluminescence by multi-timescale spectroscopic measurements synchronized with the device operation. Bias-modulation spectroscopy, measuring spectral responses to modulated biases, reveals the bias-dependent behavior of p-doped layers varying from growth to saturation and to recession. The operation dynamics of the LEC is directly visualized by time-resolved bias-modulation spectra, revealing the following findings. Electron injection occurs more slowly than hole injection, causing delay of electroluminescence with respect to the p-doping. N-doping proceeds as the well-grown p-doped layer recedes, which occur while the electroluminescence intensity remains constant. With the growth of n-doped layer, hole injection is reduced due to charge balance, leading to hole-accumulation on the anode, after which LEC operation reaches equilibrium. These spectroscopic techniques are widely applicable to explore the dynamics of electroluminescence-devices. The recombination between electrons and holes in electroluminescence processes has never been directly evaluated. Here, Yasuji et al. directly visualize, with spectroscopic techniques, operation dynamics in light-emitting electrochemical cells during device operation, leading to a rapid device evaluation.
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ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-023-36472-6