The effect of deuteration on organic magnetoresistance

Rolfe, N. J.; Heeney, Martin; Wyatt, P. B.; Drew, A.J.; Kreouzis, Theo; Gillin, W. P.

doi:10.1016/j.synthmet.2010.11.044

Cited by 11 publications

(5 citation statements)

References 32 publications

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“…The superior MR response of the D-Alq 3 OSV is maintained at various voltages (Fig. 2c) This observation is at variance with an earlier study in which much smaller dependence on the isotope exchange was reported 9,14 . Second, the MEL(B) response shows another feature at low fields (B<~2 mT) [ Fig.…”

Section: B Magneto-resistance In Organic Spin-valvessupporting

confidence: 48%

“…This should occur since the HFI constant, a HF , scales with the nuclear g-factor 13 , whereas the other proposed interactions are mostly isotope insensitive. Consequently, the isotope exchange effect on the MFE(B) response in Alq 3 -based OLED was recently studied to scrutinize the proposed spin-mixing models 9,14 . It was concluded that the MFE in Alq 3 -based OLED is not dominated by PP or BP species, since it was found that the HFI does not play a major role in determining the MC(B) and MEL(B) responses.…”

Section: Introductionmentioning

confidence: 99%

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Isotope effect in the spin response of aluminum tris(8-hydroxyquinoline) based devices

Nguyen

Basel

et al. 2012

Phys. Rev. B

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We studied the spin response of various magnetic field effects and magneto-transport in both protonated and deuterated aluminum tris(8-hydroxyquinoline) [Alq 3 ]-based organic light emitting diodes and spin-valve devices. Both conductivity-detected magnetic resonance in diodes and magneto-resistance in spin valves show substantial isotope dependence pointing to the importance of the hyperfine interaction (HFI) in the spin response of spin ½ charge polarons in Alq 3 . In addition the low field (B<20 mT) magneto-electroluminescence (MEL) response is also isotope sensitive, showing that HFI-induced spin mixing of polaron-pairs spin sublevels dominates this response too. However, the magneto-conductance (MC) response was found to be much less sensitive to isotope exchange at low fields, in agreement with previous studies. The disparity between the isotope sensitivity of MC and MEL responses in Alq 3 indicates that the HFI in the MC response is overwhelmed by an isotope independent spin mixing mechanism. We propose that collisions of spin ½ carriers -with triplet species such as polaron pairs may be the main spin mixing mechanism in the low field MC response in Alq 3 diodes.

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Section: B Magneto-resistance In Organic Spin-valvessupporting

confidence: 48%

Section: Introductionmentioning

confidence: 99%

Isotope effect in the spin response of aluminum tris(8-hydroxyquinoline) based devices

Nguyen

Basel

et al. 2012

Phys. Rev. B

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“…This scenario is supported by the observation of phosphorescence in Alq 3 films [95]. It is worth noting that the MC in fullerene-based OLEDs was not observable due to ) (blue lines) [65], and triple Lorentzian function (olive line) [91]. Reproduced with permission.…”

Section: Advances In Experimental Parts Of Magnetic Field Effect In Omentioning

confidence: 62%

“…This scenario was discussed before by Wang et al [60] Gillin et al found that OMAR can be better fit by the sum of two or three Lorentzian functions (see the olive line in Fig. 6) [90,91]. This suggests that there may be more than one OMAR mechanism involved in the effect depending on OSC materials, device fabrication and operating condition [60,90].…”

Section: Advances In Experimental Parts Of Magnetic Field Effect In Omentioning

confidence: 63%

A review on organic spintronic materials and devices: I. Magnetic field effect on organic light emitting diodes

Geng

Daugherty

et al. 2016

Journal of Science: Advanced Materials and Devices

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a b s t r a c tOrganic spintronics is an emerging and potential platform for future electronics and display due to the intriguing properties of organic semiconductors (OSCs). For the past decade, studies have focused on three types of organic spintronic phenomena: (i) magnetic field effect (MFE) in organic light emitting diodes (OLEDs), where spin mixing between singlet and triplet polaron pairs (PP) can be influenced by an external magnetic field leading to organic magnetoresistive effect (OMAR); (ii) magnetoresistance (MR) in organic spin valves (OSVs), where spin injection, transport, manipulation, and detection have been demonstrated; and (iii) magnetoelectroluminescence (MEL) bipolar OSVs or spin-OLEDs, where spin polarized electrons and holes are simultaneously injected into the OSC layer, leading to the dependence of electroluminescence intensity on relative magnetization of the electrodes. In this first of two review papers, we present major experimental results on OMAR studies and current understanding of OMAR using several spin dependent processes in organic semiconductors. During the discussion, we highlight some of the outstanding challenges in this promising research field. Finally, we provide an outlook on the future of organic spintronics.

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“…These are known as the low-field effect and the high-field effect. The low-field effect has been ascribed to the spin evolution of the PP excitations in the local hyperfine field before exciton formation. − This effect saturates at a field higher than the hyperfine field region, which is typically about 4 mT. However, in some cases, a further positive process is found, which does not saturate at high fields; and this is due to the field effect on the triplet excitons after the PP T → triplet exciton formation. , In particular, Chen et al reported an additional decay in the MEL( B ) response at the high-field region and low temperatures in Alq 3 -based OLEDs .…”

Section: Introductionmentioning

confidence: 99%

Degradation Analysis of Organic Light-Emitting Diodes through Dispersive Magneto-Electroluminescence Response

Mondal

Pan

Kwon

et al. 2023

ACS Appl. Mater. Interfaces

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Understanding the stability and degradation of organic light-emitting diodes (OLEDs) under working conditions is a significant area of research for developing more effective OLEDs and further improving their performance. However, studies of degradation processes by in situ noninvasive methods have not been adequately developed. In this work, tris-(8-hydroxyquinolino) aluminum (Alq3)-based OLED degradation processes have been analyzed through the investigation of the device dispersive magneto-electroluminescence (MEL(B)) response measured at room temperature. By studying the change in the MEL(B) response during the device degradation under different external stimuli, such as exposing the device to the atmosphere and prolonged illumination by a strong visible light source, we have gained insight into the microscopic spin-dependent phenomena that control the recombination of e–h polaron pairs in the device. We found that the device degradation leads to a shorter e–h polaron lifetime, smaller dispersive parameter, and broader lifetime distribution function that shows increased disorder in the active layer. This study could offer a potential tool that may be beneficial for assessing the degradation of OLED devices based on various active layers.

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The effect of deuteration on organic magnetoresistance

Cited by 11 publications

References 32 publications

Isotope effect in the spin response of aluminum tris(8-hydroxyquinoline) based devices

Isotope effect in the spin response of aluminum tris(8-hydroxyquinoline) based devices

A review on organic spintronic materials and devices: I. Magnetic field effect on organic light emitting diodes

Degradation Analysis of Organic Light-Emitting Diodes through Dispersive Magneto-Electroluminescence Response

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