2020
DOI: 10.1002/anie.202002477
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Perdeuterated Conjugated Polymers for Ultralow‐Frequency Magnetic Resonance of OLEDs

Abstract: The formation of excitons in OLEDs is spin dependent and can be controlled by electron‐paramagnetic resonance, affecting device resistance and electroluminescence yield. We explore electrically detected magnetic resonance in the regime of very low magnetic fields (<1 mT). A pronounced feature emerges at zero field in addition to the conventional spin‐1/2 Zeeman resonance for which the Larmor frequency matches that of the incident radiation. By comparing a conventional π‐conjugated polymer as the active materi… Show more

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Cited by 13 publications
(16 citation statements)
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“…In Ref. [3], we noted the similarity of these signals to the curvature of the static magnetic field effect, i.e., the magnetoresistance [13]. We note that this near-zero-frequency regime of oscillating magnetic field effects was previously predicted theoretically in radicalpair effects in reaction-yield-detected magnetic resonance (RYDMR) [14] and observed experimentally [15,16].…”
Section: Introductionsupporting
confidence: 74%
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“…In Ref. [3], we noted the similarity of these signals to the curvature of the static magnetic field effect, i.e., the magnetoresistance [13]. We note that this near-zero-frequency regime of oscillating magnetic field effects was previously predicted theoretically in radicalpair effects in reaction-yield-detected magnetic resonance (RYDMR) [14] and observed experimentally [15,16].…”
Section: Introductionsupporting
confidence: 74%
“…By exploring a significantly larger part of the full parameter space of the EDMR experiments at lower frequencies than in Ref. [3], including parallel driving conditions where B 1 B 0 , we are now able to provide a conclusive reasoning for the observed zero-field phenomena in OLED EDMR. Following an intuitive picture of the quasistatic magnetic field effect, a numerical procedure can be performed to compute the line shape and signal amplitude expected in a low-frequency magneticresonance experiment without the need of any quantitative microscopic assumptions or parameters.…”
Section: Introductionmentioning
confidence: 79%
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“…The application of these diverse π-conjugated polymers represents a potentially fertile field for chemistry and materials research (Dai et al, 2020 ; Saito et al, 2020 ). Recently, there is an increasing interest in conjugated polymers, and their applications are becoming more widespread, such as intrinsically conducting polymers (Aydemir et al, 2016 ), solar cells (Zhang et al, 2019 ; Liu et al, 2020 ), and organic light emitting diodes (OLEDs) (Lozano-Hernández et al, 2020 ; Milster et al, 2020 ). Besides, conjugated double bonds have more excellent reactivity compared to isolated double bonds, so conjugated polymers are widely used as substrates to prepare high-performance materials through chemical modification.…”
Section: Introductionmentioning
confidence: 99%