Manifestation of Superradiation and Excitonic Energy Transfer in Optical Spectra of Ultrasmall ZnSe Quantum‐Dot Films with Energetic and Spatial Disorder DOI
N. V. Bondar, Yu. P. Piryatinskiĭ

physica status solidi (b), Journal Year: 2025, Volume and Issue: unknown

Published: May 16, 2025

Herein, the ZnSe aqueous quantum dots (QDs) in colloids and solid films, which have attracted much interest due to their exclusive optical properties, are investigated. It is established that energy static disorder lead an inefficient mechanism of transfer because interplay between coherent wavelike incoherent hopping regimes, by selecting excitation energy, it possible separate these regimes determine spectral region where more efficient, quasi‐coherent one dominant. Resultantly, both superradiation decay from a delocalized exciton state rate, competition excitonic coupling disorder, determined. Comparing spectra QD films determines strength origin Stokes shift. Experimental proof provided solutions, latter caused mainly confined state, while shift diffusion toward large QDs strong adjacent QDs, but not extrinsic factors, such as in‐gap or surface (defects) states.

Language: Английский

Perovskite nanocrystal superlattices and their application in light-emitting devices DOI
Siqi Sun, Min Lu, Po Lu

et al.

Materials Science and Engineering R Reports, Journal Year: 2025, Volume and Issue: 164, P. 100984 - 100984

Published: March 25, 2025

Language: Английский

Citations

0
Polarized Superradiance from CsPbBr3 Quantum Dot Superlattice with Controlled Interdot Electronic Coupling DOI Creative Commons

Lanyin Luo,

Xueting Tang, Jun-Hee Park

et al.

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: April 1, 2025

Cooperative emission of photons from an ensemble quantum dots (QDs) as superradiance can arise the electronically coupled QDs with a coherent emitting excited state. This contrasts superfluorescence (Dicke superradiance), where cooperative photon requires buildup coherence in incoherently via their coupling to common radiation mode. In perovskite QDs, has been rarely observed, unlike superfluorescence, due challenge QD electronic coupling. Here, we report very narrow linewidth (<5 meV) and large redshift (∼200 strongly CsPbBr3 superlattice achieved through combination confinement ligand engineering. The is polarized contrast uncoupled exciton same superlattice, indicating anisotropic superlattices. finding suggests potential structurally controllable interdot emitters.

Language: Английский

Citations

0
Manifestation of Superradiation and Excitonic Energy Transfer in Optical Spectra of Ultrasmall ZnSe Quantum‐Dot Films with Energetic and Spatial Disorder DOI
N. V. Bondar, Yu. P. Piryatinskiĭ

physica status solidi (b), Journal Year: 2025, Volume and Issue: unknown

Published: May 16, 2025

Herein, the ZnSe aqueous quantum dots (QDs) in colloids and solid films, which have attracted much interest due to their exclusive optical properties, are investigated. It is established that energy static disorder lead an inefficient mechanism of transfer because interplay between coherent wavelike incoherent hopping regimes, by selecting excitation energy, it possible separate these regimes determine spectral region where more efficient, quasi‐coherent one dominant. Resultantly, both superradiation decay from a delocalized exciton state rate, competition excitonic coupling disorder, determined. Comparing spectra QD films determines strength origin Stokes shift. Experimental proof provided solutions, latter caused mainly confined state, while shift diffusion toward large QDs strong adjacent QDs, but not extrinsic factors, such as in‐gap or surface (defects) states.

Language: Английский

Citations

0