Using magneto-electroluminescence as a fingerprint to identify the spin polarization and spin–orbit coupling of magnetic nanoparticle doped polymer light emitting diodes

Jia, Weiyao; Ikoma, Tadaaki; Chen, Lixiang; Zhu, Hong Qiang; Tang, Xiantong; Qu, Fenlan; Xiong, Zuhong

doi:10.1039/c9ra01501a

Cited by 3 publications

(1 citation statement)

References 60 publications

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“…With a decrease in temperature, the change of MEL shows divergence, e.g., it decreases for Alq 3 -based devices [6] and increases for MEH-PPV based OLEDs [7]. The effect has been used as a tool to reveal the intrinsic spin-related process, such as spin-orbit coupling and hyperfine interaction in organic semiconductors [8]. However, the mechanism of MEL is still uncertain, several competing models, such as an exciton model, a bipolaron model, an exciton polaron interaction model and a triplet-triplet annihilation model, have been studied to try to explain it [2,9,10,11].…”

Section: Introductionmentioning

confidence: 99%

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

Zhu

Yuan

2019

Micromachines

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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.

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Section: Introductionmentioning

confidence: 99%

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

Zhu

Yuan

2019

Micromachines

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Effects of unipolar and bipolar charges on the evolution of triplet excitons in π-conjugated PLED

Bao,

Guan,

et al. 2023

Journal of Applied Physics

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Understanding and modulating the spin-pair correlation of conjugated polymer materials in π-conjugated polymer light-emitting devices (PLEDs) plays a crucial role in the development of their applications. We investigated the relationships between the internal hyperfine interactions (HFIs), triplet–triplet annihilation (TTA), and triplet–charge annihilation (TCA) spin evolution processes in π-conjugated PLED. Research has shown that in a unipolar π-conjugated PLED, the “M” shaped ultra-small magnetic field effect is due to the HFI between hole polarons and the spin-mixing process of charge carriers. Under high magnetic fields (15 mT<|B|<350 mT), the TCA process dominates the negative magneto-conductance (MC), and its intensity and sign are not controlled by temperature. In polar π-conjugated PLED, excess carriers can provide conditions for the generation of TCA. Moreover, π-conjugated polymers (emission layers) have relatively strong electron–phonon coupling, which can capture triplet excitons into adjacent organic layers to obtain higher triplet exciton concentrations, resulting in the TTA process. Under low-temperature conditions, excess carriers induce the magneto-electroluminescence (MEL) effect to undergo TTA and form P-type delayed fluorescence. This study can provide a new mechanism explanation for the HFI in PLED devices and a new approach for the effective utilization of triplets.

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Synthesis and Electron Transporting Properties of Polyfluorene-<i>graft</i>-Polystyrene

Cheng

Kanehashi

Ogino

2022

JFST

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Using magneto-electroluminescence as a fingerprint to identify the spin polarization and spin–orbit coupling of magnetic nanoparticle doped polymer light emitting diodes

Abstract: The existence of spin polarization was confirmed while spin–orbit coupling was ruled out in Fe3O4-based PLEDs by magneto-electroluminescence analysis.

Cited by 3 publications

References 60 publications

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

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

Effects of unipolar and bipolar charges on the evolution of triplet excitons in π-conjugated PLED

Synthesis and Electron Transporting Properties of Polyfluorene-<i>graft</i>-Polystyrene

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