Defect-mediated spontaneous emission enhancement of plasmon-coupled CuInS sub(2) and CuInS sub(2)/ZnS

The studies of plasmon-coupled excitons at the surface-/interface-, shallow-, and deep-trapped states of copper-indium-disulfide (CIS) with/without zinc-sulfide (ZnS) shell revealed the defect-mediated spontaneous emission enhancement. The PL enhancement with spectral blue-shift of plasmon-coupled e...

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Bibliographic Details
Published in:Optical materials express 2016-02, Vol.6 (2), p.566-577
Main Authors: Rice, Quinton, Raut, Sangram, Chib, Rahul, Hayes, Anderson, Gryczynski, Zygmunt, Gryczynski, Ignacy, Kim, Young-Kuk, Tabibi, Bagher, Seo, Jaetae
Format: Article
Language:English
Subjects:
COPPER INDIUM SULFIDE
Coupling
Decay rate
DEFECTS
EMISSIONS
Excitons
Quantum dots
Spectra
Spectral emissivity
Spontaneous emission
SULFIDES
ZINC SULFIDE
Zinc sulfides
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Summary:The studies of plasmon-coupled excitons at the surface-/interface-, shallow-, and deep-trapped states of copper-indium-disulfide (CIS) with/without zinc-sulfide (ZnS) shell revealed the defect-mediated spontaneous emission enhancement. The PL enhancement with spectral blue-shift of plasmon-coupled excitons in CIS quantum dots (QDs) indicates the large reduction of nonradiative decay at the surface- and shallow-trapped states with strong spectral overlapping. The PL enhancement with spectral red-shift of plasmon-coupled excitons in CIS/ZnS QDs is accredited to the defect-mediated PL enhancement by the higher fractional amplitude at the interface-trapped state around the longer spectral region. The spontaneous emission enhancement of plasmon-coupled CIS QDs were ~2.1, ~2.2, and ~2.8-folds compared to the decay rates of CIS, and those of plasmon-coupled CIS/ZnS QDs were ~24.1, ~32.8, and ~24.9-folds compared to the decay rates of CIS/ZnS at shorter, intermediate, and longer spectral regions due to relatively stable charge carriers and close to the surface plasmon resonance. The PL enhancements of plasmon-coupled CIS at room temperature and 6 K were two-fold and three-fold compared to the integrated CIS PLs, and the PL enhancements of plasmon-coupled CIS/ZnS at room temperature and 6 K were five-fold and eight-fold compared to the integrated CIS/ZnS PLs. The large PL enhancement is attributable to the plasmon-exciton coupling through Coulomb interaction and the local field enhancement. The larger PL enhancement of plasmon-coupled CIS/ZnS compared to that of plasmon-coupled CIS is accredited to the larger spontaneous emission enhancement.
ISSN:2159-3930
2159-3930
DOI:10.1364/OME.6.000566