Magneto-Electroluminescence in ITO/MEH-PPV:PEO:LiCF3SO3/Al Polymer Light-Emitting Electrochemical Cells.

Mingpeng Zhu,Gang Ni,Xueting Yuan

doi:10.3390/mi10080546

Mingpeng Zhu, Gang Ni + Show 1 more

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https://doi.org/10.3390/mi10080546

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Journal: Micromachines	Publication Date: Aug 17, 2019
Citations: 3	License type: CC BY 4.0

Affiliation: Fudan University

Abstract

Magnetic field effects (MFE) have been extensively studied in organic light emitting diodes because of their potential application in organic spintronics devices. However, only a few studies on MFE in organic light-emitting electrochemical cells (LEC) have been reported. In this paper, magnetic field effects on the electroluminescence of an LEC device with the structure of ITO/MEH-PPV:PEO:LiCF3SO3/Al were studied at various temperatures. The luminance–current–voltage curves of the device shows the typical bi-polar characteristics of LECs; positive magnetic electroluminescence (MEL) was observed with a value of about 2.5% (B = 42 mT, 250 K), showing a Lorentzian line shape. With a decrease in temperature, the MEL value and the threshold voltage increased accordingly, below the possible mechanism is discussed.

Highlights

Spin-related physical phenomena in organic semiconductors have been widely studied
Magneto-electroluminescence (MEL)—that is, a change in the electroluminescence upon application of a magnetic field, has been observed in non-magnetic organic light emitting diodes (OLEDs), the MEL values and signs depend on the organic materials, applied voltage, and temperature [1,2,3,4,5]
With a decrease in temperature, the change of MEL shows divergence, e.g., it decreases for Alq3-based devices [6] and increases for MEH-PPV based OLEDs [7]

Summary

Introduction

Spin-related physical phenomena in organic semiconductors have been widely studied. Magneto-electroluminescence (MEL)—that is, a change in the electroluminescence upon application of a magnetic field, has been observed in non-magnetic organic light emitting diodes (OLEDs), the MEL values and signs depend on the organic materials, applied voltage, and temperature [1,2,3,4,5]. With a decrease in temperature, the change of MEL shows divergence, e.g., it decreases for Alq3-based devices [6] and increases for MEH-PPV based OLEDs [7].

Results

Conclusion