Mediation of exciton concentration on magnetic field effects in NPB : Alq3-based heterojunction OLEDs

Song, Jiayi; Cheng, Wang; Guan, Yunxia; Bao, Xi; Li, Wan Jiao; Chen, Lijia; Niu, Lianbin

doi:10.1039/d3ra03608a

RSC Adv.

2023

DOI: 10.1039/d3ra03608a

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Mediation of exciton concentration on magnetic field effects in NPB : Alq3-based heterojunction OLEDs

Jiayi Song

Wang Cheng

Yunxia Guan

et al.

Abstract: Organic light-emitting diodes (OLEDs) are considered one of the most promising new display technologies owing to their advantages, such as all-solid-state, high color gamut, and wide viewing angle.

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Cited by 3 publications

References 42 publications

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Magneto‐Electroluminescence Responses Mediated by Magneto‐Conductance in Polymer and Thermally Activated Delayed Fluorescence‐Emitter‐Based Light‐Emitting Diodes

Mujahid,

Lin,

et al. 2024

Advanced Photonics Research

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The magneto‐electroluminescence (MEL) responses of polymer and thermally activated delayed fluorescence‐emitter‐based light‐emitting diodes (TADF LEDs) under constant voltage and current regimes are characterized to elucidate that the current as regulated by magneto‐conductance (MC) mediates MEL of devices. Through the analytical fitting of MC and MEL curves, it is disclosed that MC (as interpreted by the polar pair model) partially involves the changes in the curve features, magnitudes, and shapes of MEL responses. A negative curve feature in the MEL response of TADF‐based LEDs is visualized under the electric bias in a low magnetic field regime. This feature should be attributed to the mediation of the MEL by the negative MC due to the unbalanced carrier dynamics of the device. When carrier dynamics are balanced, the specific negative curve feature at low magnetic field regime disappears. In this work, the solid correlation between the MEL and MC responses is revealed and the negative curve feature of MEL under the constant voltage at the low magnetic field regime that involves the contribution from the triplet exciton charge reaction in TADF‐based LEDs is validated.

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Magneto‐Electroluminescence Responses Mediated by Magneto‐Conductance in Polymer and Thermally Activated Delayed Fluorescence‐Emitter‐Based Light‐Emitting Diodes

Mujahid,

Lin,

et al. 2024

Advanced Photonics Research

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show abstract

Molecular design and synthesis of highly soluble hole transporting materials based on phenylnaphthalene cores for solution-processible OLEDs

Kim,

Lee,

Park

et al. 2024

Dyes and Pigments

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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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Mediation of exciton concentration on magnetic field effects in NPB : Alq3-based heterojunction OLEDs

Abstract: Organic light-emitting diodes (OLEDs) are considered one of the most promising new display technologies owing to their advantages, such as all-solid-state, high color gamut, and wide viewing angle.

Cited by 3 publications

References 42 publications

Magneto‐Electroluminescence Responses Mediated by Magneto‐Conductance in Polymer and Thermally Activated Delayed Fluorescence‐Emitter‐Based Light‐Emitting Diodes

Magneto‐Electroluminescence Responses Mediated by Magneto‐Conductance in Polymer and Thermally Activated Delayed Fluorescence‐Emitter‐Based Light‐Emitting Diodes

Molecular design and synthesis of highly soluble hole transporting materials based on phenylnaphthalene cores for solution-processible OLEDs

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

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