scholarly journals Floquet spin states in OLEDs

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
S. Jamali ◽  
V. V. Mkhitaryan ◽  
H. Malissa ◽  
A. Nahlawi ◽  
H. Popli ◽  
...  
Keyword(s):  
Zeeman Splitting ◽  
Static Field ◽  
Spin Coherence ◽  
Hyperfine Fields ◽  
Light Emitting ◽  
Dressed States ◽  
Quantum Transitions ◽  
Electrically Detected Magnetic Resonance ◽  
Potential Applicability ◽  
Two Level Systems

AbstractElectron and hole spins in organic light-emitting diodes constitute prototypical two-level systems for the exploration of the ultrastrong-drive regime of light-matter interactions. Floquet solutions to the time-dependent Hamiltonian of pairs of electron and hole spins reveal that, under non-perturbative resonant drive, when spin-Rabi frequencies become comparable to the Larmor frequencies, hybrid light-matter states emerge that enable dipole-forbidden multi-quantum transitions at integer and fractional g-factors. To probe these phenomena experimentally, we develop an electrically detected magnetic-resonance experiment supporting oscillating driving fields comparable in amplitude to the static field defining the Zeeman splitting; and an organic semiconductor characterized by minimal local hyperfine fields allowing the non-perturbative light-matter interactions to be resolved. The experimental confirmation of the predicted Floquet states under strong-drive conditions demonstrates the presence of hybrid light-matter spin excitations at room temperature. These dressed states are insensitive to power broadening, display Bloch-Siegert-like shifts, and are suggestive of long spin coherence times, implying potential applicability for quantum sensing.

Magnetic Resonance Studies of Recombination Processes in GaN-Based Light Emitting Diodes

1995 ◽  
Vol 395 ◽  
Author(s):  
W.E. Carlos ◽  
E.R. Glaser ◽  
T.A. Kennedy ◽  
S. Nakamura
Keyword(s):  
Magnetic Resonance ◽  
Light Emitting Diodes ◽  
Green Emission ◽  
Light Emitting ◽  
Magnetic Resonance Studies ◽  
Double Heterostructures ◽  
Recombination Processes ◽  
Electrically Detected Magnetic Resonance ◽  
Deep Donor ◽  
Broad Feature

ABSTRACTMagnetic resonance techniques are used to study the recombination processes in GaN-based light emitting diodes (LEDs). Electrically-detected magnetic resonance (EDMR) and electroluminescence-detected magnetic resonance (ELDMR) results on InGaN/AlGaN double heterostructures are presented for blue and green LEDs. In either technique our signals are dominated by a broad feature that we ascribe to a deep Zn-related acceptor. Our ELDMR measurements show that this is associated with the blue or green emission. Our EDMR measurements resolve a second center that is tentatively identified as a deep donor trap.

ELECTRON SPIN COHERENCE IN SINGLY CHARGED QUANTUM DOTS

2009 ◽  
Vol 23 (12n13) ◽  
pp. 2813-2825
Author(s):  
D. R. YAKOVLEV ◽  
A. GREILICH ◽  
M. BAYER ◽  
I. A. YUGOVA
Keyword(s):  
Quantum Dots ◽  
Electron Spin ◽  
Zeeman Splitting ◽  
Mode Locking ◽  
Spin Coherence ◽  
Time Resolved ◽  
Pump Probe ◽  
Spin Dephasing ◽  
Rotation Technique ◽  
Singly Charged

Electron spin coherence is examined experimentally and theoretically in singly charged ( In , Ga ) As / GaAs quantum dots. Time-resolved pump-probe Faraday rotation technique is used to examine fine structure and Zeeman splitting of excitons and resident electrons. Spin dephasing and spin coherence times of resident electrons have been measured in the regime of mode-locking of spin coherency.

scholarly journals Bipolar luminescent azaindole derivative exhibiting aggregation-induced emission for non-doped organic light-emitting diodes

2019 ◽  
Vol 7 (5) ◽  
pp. 1222-1227 ◽  
Author(s):  
Cristina Martin ◽  
Carlos Borreguero ◽  
Koen Kennes ◽  
Mark Van der Auweraer ◽  
J. Hofkens ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Aggregation Induced Emission ◽  
Organic Light ◽  
Azaindole Derivative ◽  
Potential Applicability

A new D–A bipolar luminescent azaindole demonstrates its potential applicability in non-doped OLEDs.

Electrically detected magnetic resonance of organic and polymeric light emitting diodes

2004 ◽  
Vol 338-340 ◽  
pp. 622-625 ◽  
Author(s):  
F.A. Castro ◽  
G.B. Silva ◽  
L.F. Santos ◽  
R.M. Faria ◽  
F. Nüesch ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Electrically Detected Magnetic Resonance

Theory of Quantum Transitions Based on Non-adiabatic Dressed States

2011 ◽  
Author(s):  
I. G. Koprinkov ◽  
Michail D. Todorov ◽  
Christo I. Christov
Keyword(s):  
Dressed States ◽  
Quantum Transitions

Spin-Dependent Transport in GaN Light Emitting Diodes

1995 ◽  
Vol 395 ◽  
Author(s):  
M. S. Brandt ◽  
N. M. Reinacher ◽  
O. Ambacher ◽  
M. Stutzmann
Keyword(s):  
Low Temperatures ◽  
Room Temperature ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Spin Dependent Transport ◽  
Spin Resonance ◽  
Recombination Processes ◽  
Electrically Detected Magnetic Resonance ◽  
Dependent Transport ◽  
Heterostructure Devices

ABSTRACTElectrically detected magnetic resonance (EDMR) is used to study recombination processes in two types of gallium nitride light emitting diodes: in m/i/n/n+- and InGaN/AlGaN double-heterostructure devices. In the MIS-diodes, two resonances at g=1.96 and 2.00, corresponding to the effective mass donor and a deep defect are observed at room temperature. At low temperatures, an acceptor-related resonance at g=2.06 is visible as well. After current degradation, the spectra are dominated by the defect resonance, indicating that the creation of this defect is responsible for the decreased electroluminescence efficiency. In the double-heterostrucrure devices, EDMR can only be observed below 60 K showing the g=2.00 defect resonance. The same defect resonance is also observed in conventional electron spin resonance experiments under illumination (light-induced ESR).

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