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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

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Related Experiment Video

Updated: Nov 20, 2025

Development of Efficient OLEDs from Solution Deposition

Development of Efficient OLEDs from Solution Deposition

Published on: November 4, 2022

Floquet spin states in OLEDs.

S Jamali¹, V V Mkhitaryan¹, H Malissa¹

¹Department of Physics and Astronomy, University of Utah, Salt Lake City, UT, 84112, USA.

Nature Communications

|January 20, 2021

Summary

Researchers explored light-matter interactions in organic light-emitting diodes. They discovered hybrid light-matter spin states enabling new quantum transitions, with potential for quantum sensing applications.

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Area of Science:

Quantum physics
Organic electronics
Light-matter interactions

Background:

Electron and hole spins in organic light-emitting diodes (OLEDs) serve as model systems for studying light-matter interactions.
The ultrastrong-drive regime presents unique opportunities for exploring quantum phenomena.

Purpose of the Study:

To investigate the emergence of hybrid light-matter states in OLEDs under non-perturbative resonant drive.
To experimentally probe dipole-forbidden multi-quantum transitions and Floquet states.

Main Methods:

Theoretical analysis using Floquet solutions to the time-dependent Hamiltonian of electron and hole spins.
Development of an electrically detected magnetic-resonance experiment with strong oscillating driving fields.
Utilizing an organic semiconductor with minimal hyperfine fields to resolve non-perturbative interactions.

Main Results:

Experimental confirmation of predicted Floquet states under strong-drive conditions.
Observation of hybrid light-matter spin excitations at room temperature.
Demonstration of dressed states that are power broadening insensitive and exhibit Bloch-Siegert-like shifts.

Conclusions:

The study confirms the existence of hybrid light-matter spin excitations in OLEDs.
These findings suggest potential for long spin coherence times and applications in quantum sensing.