The spin-polarized organic light-emitting diode (spin-OLED) has been a long-sought device within the field of spintronics. We designed, fabricated, and studied spin-OLED with ferromagnetic electrodes that acts as bipolar spin valve (OSV), based on deuterated derivative poly(phenylene-vinylene) small hyperfine interaction. In double-injection limit, shows ~1% magneto-electroluminescence (MEL) response, which follows electrode coercive fields originates from space charge-limited current. stark...

We explore the possibility that hyperfine interaction causes recently discovered organic magnetoresistance (OMAR) effect. deduce a simple fitting formula from Hamiltonian relates saturation field of OMAR traces to coupling constant. compare results literature values for this parameter. Furthermore, we apply an excitonic pair mechanism model based on interaction, previously suggested by others explain various magnetic-field effects in organics, data. Whereas can few key aspects experimental...

The use of hydrogen as a clean and renewable alternative to fossil fuels requires suite flammability mitigating technologies, particularly robust sensors for leak detection concentration monitoring. To this end, we have developed class lightweight optical based on metasurface Pd nano-patchy particle arrays, which fulfills the increasing requirements safe fuel sensing system with no risk sparking. structure sensor is readily nano-engineered yield extraordinarily rapid response gas (<3 s at 1...

We measured magnetoconductance (MC) response in a number of unipolar and bipolar organic diodes based on π-conjugated polymers small molecules at fields |B|<100 mT various bias voltages temperatures. Similar to magneto-electroluminescence, the MC(B) shows sign reversal ultrasmall |B|<1-2 due interplay hyperfine Zeeman interactions opposite-charge polaron pairs. Surprisingly, similar was also devices, indicating existence like-charge pairs, however, with clear difference between interaction...

We present magnetoconductivity and magnetoluminescence measurements in sandwich devices made from the $\ensuremath{\pi}$-conjugated molecule tris-(8-hydroxyquinoline) aluminum $({\text{Alq}}_{3})$ demonstrate effects of more than 25% 50% magnitude, respectively. These are known to be caused by hyperfine coupling pairs paramagnetic species, it is often assumed that these electron-hole pairs. However, we show very large magnitude effect contradicts knowledge pair recombination processes...

We study the recently discovered organic magnetoresistance (OMAR) effect in a pair of materials that have similar chemical structures except one contains heavy atom to enhance spin-orbit coupling. use photoluminescence spectroscopy estimate coupling strength. In material with weak characteristic magnetic field scale is comparable hyperfine strong we find OMAR strongly reduced size and traces clearly exhibit second, higher which identify model our results using standard spin-dynamics Hamiltonian.

The magnetic field effect in organic light-emitting diodes, such as magnetoconductance and magnetoelectroluminescence, has been intensively explored the last few years. Here, we demonstrate of two excited-state spectroscopies films a prototype \ensuremath{\pi}-conjugated polymer, i.e., soluble derivative poly(phenylene vinylene), [2-methoxy-5-(2\ensuremath{'}-ethylhexyloxy)-poly(p-phenylene vinylene)] (MEH-PPV); these are magnetophoto-induced absorption (MPA) magnetophotoluminescence (MPL)....

Abstract We investigated curvature-enhanced spin-orbit coupling (SOC) and spinterface effect in carbon-based organic spin valves (OSVs) using buckyball C 60 70 molecules. Since the naturally abundant 12 has spinless nuclear, materials have negligible hyperfine interaction (HFI) same intrinsic SOC, but different curvature SOC due to their distinct curvatures. fitted thickness dependence of magnetoresistance (MR) OSVs at various temperatures modified Jullière equation. found that diffusion...

The cao vit gibbon (Nomascus nasutus) is one of the rarest primates on Earth and now only survives in a single forest patch less than 5000 ha Vietnam-China border. Accurate monitoring last remaining population critical to inform ongoing conservation interventions track success over time. However, traditional methods for gibbons, involving triangulation groups from their songs, are inherently subjective likely subject considerable measurement errors. To overcome this, we aimed use 'vocal...

We study a recently discovered organic magnetoresistive (OMAR) effect whose underlying mechanism is currently not known with certainty. examine the hypothesis that OMAR caused by spin-dynamics varying strength of hyperfine and spin–orbit coupling in semiconductor material. show unlike most other materials, C60 devices do exhibit effect. Therefore hydrogen atoms resulting strong nuclear necessary prerequisite for observation OMAR. investigate dependence on spin-coupling introduced heavy two...

We studied the spin response of various magnetic field effects and magnetotransport in both protonated deuterated aluminum tris(8-hydroxyquinoline) [Alq${}_{3}$]-based organic light emitting diodes spin-valve devices. Both conductivity-detected resonance magnetoresistance valves show substantial isotope dependence pointing to importance hyperfine interaction (HFI) \textonehalf{} charge polarons Alq${}_{3}$. In addition, low ($B$ 20 mT) magnetoelectroluminescence (MEL) is also sensitive,...

The buckminsterfullerene C${}_{60}$ molecules are composed of \ensuremath{\sim}99$%$ naturally abundant ${}^{12}$C carbon atoms having spinless nucleus and thus zero hyperfine interaction. Therefore it has been assumed that the spin diffusion length in C${}_{60}$-based spin-valves is large. We fabricated based on studied magnitude obtained giant magnetoresistance (GMR) as a function bias voltage, temperature, layer thickness. Surprisingly, we found GMR first increases thickness increases,...

Charge transport in amorphous organic semiconductors is governed by carriers hopping between localized states with small spin diffusion length. Furthermore, the interfacial resistance of valves (OSVs) poorly controlled resulting controversial reports magnetoresistance (MR) response. Here, surface‐initiated Kumada transfer polycondensation used to covalently graft π‐conjugated poly(3‐methylthiophene) brushes from La 0.67 Sr 0.33 MnO 3 (LSMO) bottom electrode. The covalent attachment along...

Interfacing an organic semiconductor C₆₀ with a non-magnetic metal (Cu or Pt) and magnetic (Fe Co) can create new class of spin-caloric materials.

Hyperfine interaction (HFI), originating from the coupling between spins of charge carriers and nuclei, has been demonstrated to strongly influence spin dynamics localized charges in organic semiconductors. Nevertheless, role localization on HFI strength thin films not yet experimentally investigated. In this study, statistical relation hypothesis that effective holes regioregular poly(3-hexylthiophene) (P3HT) is proportional $1/{N}^{0.5}$ examined, where $N$ number random nuclear within...

Abstract Chirality transfer from organic chiral molecules to lead halides is theorized as the origin of strong Rashba‐Dresselhaus effect causing large circular dichroism (CD) and circularly polarized luminescence (CPL) in metal halide perovskites (MHPs). Here, a concrete empirical evidence provided that such CD CPL can occur even nonchiral 2D Ruddlesden‐Popper (RPPs) (BA) 2 (MA) n −1 Pb I 3 +1 (where MA = CH NH BA (CH ) ). The responses occurring at excitonic transition MHPs are strongest...

Abstract Despite their excellent intrinsic stability, low‐dimensional Ruddlesden‐Popper (LDRP) perovskites face challenges with low power conversion efficiency (PCE), primarily due to the widen bandgap and limited charge transport caused by bulky spacer cation. Herein, we introduce formamidinium chloride (FACl) as an additive into (4‐FPEA) 2 MA 4 Pb 5 I 16 perovskite. On one hand, addition of FACl narrows through cation exchange between + FA , thereby extending light absorption range...

Abstract We studied spin dynamics of charge carriers in the superlattice-like Ruddlesden-Popper hybrid lead iodide perovskite semiconductors, 2D (BA) 2 (MA)Pb I 7 (with MA = CH 3 NH , and BA (CH ) ), 3D MAPbI using magnetic field effect (MFE) on conductivity electroluminescence their light emitting diodes (LEDs) at cryogenic temperatures. The semiconductors with distinct structural/bulk inversion symmetry breaking, when combined colossal intrinsic spin–orbit coupling (SOC), theoretically...