Effect of 
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-factor anisotropy in the magnetoresponse of organic light-emitting diodes at high magnetic fields

Nikiforov, D. V.; Khachatryan, Bagrat; Tilchin, Jenya; Lifshitz, E.M.; Tessler, Nir; Ehrenfreund, E.

doi:10.1103/physrevb.98.235204

Cited by 6 publications

(14 citation statements)

References 26 publications

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“…In this section we describe quantitatively MFE with final expressions for MFE(B) effects. [47,48] We specifically describe the HF interaction, the effect of the exchange interaction, and the Δg mechanism; we add a non-Hermitian decay term, including dispersive decay and give formulae for the line shape. We also discuss thermal spin polarization and give a formula for its line shape.…”

Section: Calculation Of Mfe -Polaron Pair Modelmentioning

confidence: 99%

“…The interaction strength is in the range of 10-400 neV. [44,47,49] The second term in Eq. ( 1) is the Zeeman interaction given by…”

Section: The Effect Of Coherent Spin Mixingmentioning

confidence: 99%

“…However, in the case of PP in homopolymer layers the relative orientation of the two polarons should be taken into account. [47] The third term in Eq. ( 1) is the HF interaction,…”

Section: The Effect Of Coherent Spin Mixingmentioning

confidence: 99%

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Magnetic Field Effects of Charge Transfer Excitons in Organic Semiconductor Devices

Nikiforov

Ehrenfreund

2021

Israel Journal of Chemistry

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The topic of this review is the effect of magnetic field on photo‐current (PC) in organic semiconductor devices. Magnetic field modifies the fraction of the singlet/triplet population in the charge transfer excitons (CTE) whose lifetime is spin configuration dependent yielding magneto‐PC (MPC). We review MPC in the framework of the polaron pair model and emphasize the effect of CTE lifetime on MPC. In addition to a detailed calculation of the MPC response we find a range of physical parameters in which the response follows a simple ′fit function′. For example, a sum of wide and narrow Lorentzian functions, MPC(B)=cwB2/(B2+bw2)+cnB2/(B2+bn2), in the case of hyperfine interaction; or a Voigt profile V=L*G, where the sign * stands for the convolution operation between a Lorentzian (L) and a Gaussian (G) functions, in the case of thermal spin polarization. We provide expressions for the fit parameters in terms of physical parameters.

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Section: Calculation Of Mfe -Polaron Pair Modelmentioning

confidence: 99%

“…The interaction strength is in the range of 10-400 neV. [44,47,49] The second term in Eq. ( 1) is the Zeeman interaction given by…”

Section: The Effect Of Coherent Spin Mixingmentioning

confidence: 99%

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Magnetic Field Effects of Charge Transfer Excitons in Organic Semiconductor Devices

Nikiforov

Ehrenfreund

2021

Israel Journal of Chemistry

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“…[2][3][4][5][6][7][8][9][10] Importantly, it has been shown that the e-h recombination and dissociation has a Lorentzian line shape only if the spin-pair lifetime, τ is a single value. [21] In molecular OLEDs, the amorphous nature of the organic active layer, especially when vacuum-deposited may lead to a broad distribution of spin relaxation times, [22,23,24] and therefore the Lorentzian MEL(B) response may not occur frequently. In the present work we have taken into account the spin lifetime distribution by modifying the MEL(B) Lorentzian function, namely MEL ∝ 1/(1 + (B/B 0 ) 2 ) by the Cole-Cole function [25] ; MEL ∝ Re[1/(1 + (iB/B 0 ) α )], where α ≤ 1 is the dispersive parameter.…”

Section: Introductionmentioning

confidence: 99%

Disorder‐Induced Dispersive Magneto‐Electroluminescence of Blue Emitters in Organic Light Emitting Diodes

Pan

Kwon

Khanal

et al. 2021

Advanced Optical Materials

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Disorder‐induced inhomogeneity in blue‐fluorescent‐based organic light‐emitting diodes (OLEDs) based on mixtures of host and guest molecules is studied using magneto‐electroluminescence, MEL(B), response based on the so called “Δg mechanism”, where Δg is the difference in the Landé g‐factor of electrons and holes. The disorder in the organic active layer is manifested by a unique non‐Lorentzian MEL(B) response that is analyzed using a distribution of spin lifetimes for the injected electron–hole pairs that is determined by a dispersive parameter, α (<1). The carriers’ inhomogeneous response also influences the free carrier absorption spectrum, which shows characteristic properties described by a dispersive parameter β (<1). From the measured MEL(B) response at various injection conditions it is found that α is robust at increasing current density showing that the inhomogeneity is governed by intrinsic disorder in the device active layer. Also the obtained increase in α at low temperature indicates that the organic layer becomes more ordered, where longer‐lived electron–hole spin pairs are formed.

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“…The MEL responses originated from internal spin interaction processes in organic semiconductors. [21][22][23][24][25][26][27] Different spin interaction processes generally have different MEL characteristics such as line shape and linewidth. Thus, MEL can be served as "characteristic ngerprints" to identify the dynamic behaviours of underlying spin interactions in a non-destructive manner.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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Effect of g -factor anisotropy in the magnetoresponse of organic light-emitting diodes at high magnetic fields

Cited by 6 publications

References 26 publications

Magnetic Field Effects of Charge Transfer Excitons in Organic Semiconductor Devices

Magnetic Field Effects of Charge Transfer Excitons in Organic Semiconductor Devices

Disorder‐Induced Dispersive Magneto‐Electroluminescence of Blue Emitters in Organic Light Emitting Diodes

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

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