Optical nonlinearities and carrier trapping dynamics in CdS and CuxS nanocrystals

Klimov, Victor I.; Bolívar, Peter Haring; Kurz, H.; Karavanskiĭ, V. A.

doi:10.1006/spmi.1996.0095

Cited by 50 publications

(38 citation statements)

References 30 publications

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“…The values we obtained are in accord with those observed by Klimov et al [2,3]. The slower picosecond component is attributed to the electron trapping and relaxation.…”

Section: Comparison Of Transmission Dynamics With Luminescence Dynamicssupporting

confidence: 93%

“…This rate usually depends on the carrier excess energy. Due to the bandwidth of pulses used in the femtosecond experiments and due to a large hole-electron mass ratio (about seven times), the bleaching dynamics are dominated by the electron contribution [2]. A large excess energy of photo-excited carriers leads 4 to a faster carrier relaxation and more efficient trapping.…”

Section: Resultsmentioning

confidence: 99%

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Ultrafast carrier dynamics in CdS-doped glasses

Miyoshi

Malý

Trojánek

2003

Journal of Luminescence

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Luminescence dynamics of CdS-doped glasses were measured using up-conversion technique, and they were compared with transmission dynamics. An analysis of the decay curves of luminescence and transmission dynamics has been performed using a multi-exponential fit.Although slower decay component is large in transmission dynamics, it is negligibly small in luminescence dynamics. This difference is observed in all samples investigated, and this may be caused by the difference in relaxation paths of electrons and holes in CdS nanocrystals. Effect of induced absorption on transmission dynamics was examined.

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“…The values we obtained are in accord with those observed by Klimov et al [2,3]. The slower picosecond component is attributed to the electron trapping and relaxation.…”

Section: Comparison Of Transmission Dynamics With Luminescence Dynamicssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Ultrafast carrier dynamics in CdS-doped glasses

Miyoshi

Malý

Trojánek

2003

Journal of Luminescence

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“…Copper sulfide NCs with anomalous optical properties are expected to be a efficient third-order nonlinear optical materials 1) and hetero-junction solar cell materials, 2) while a Cu 2 S thin film is applicable for an electrolyte-capacitated quantum atom switch. 3) Such a copper sulfide group (Cu x S) involves various compounds, Cu 2 S(chalcocite), Cu 1;96 S(djurleite), Cu 1:8 S(digenite) and CuS(covellite).…”

Section: Introductionmentioning

confidence: 99%

Morphology and Composition-Controls of Cu<I><SUB>x</SUB></I>S Nanocrystals Using Alkyl-Amine Ligands

2006

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Nearly monodispersed-size Cu x S nanocrystals(NCs) were obtained by sulfuration of Cu(II)-alkyl-amine complexes using dodecanethiolsolvated sulfur at 363 K. The morphology and chemical composition of Cu x S NCs can be controlled by using appropriate alkyl-amine ligands. NCs of Cu-deficient sulfides, Cu 1:8 S (digenite) or a Cu 1:8 S-Cu 2 S mixture, were obtained using octylamine or di-octylamine, while stoichiometric Cu 2 S NCs using tri-octylamine and oleylamine ligands.

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“…The relaxation of holes to the defect states at the core/shell interface occurs much faster than either of these timescales. 15,16 The short time scale, s f , on the order of hundreds of picoseconds, is compatible with measurements of the lifetime from CdSe core-only nanoplatelets. …”

mentioning

confidence: 62%

Time-resolved photoluminescence study of CdSe/CdMnS/CdS core/multi-shell nanoplatelets

Murphy

Delikanlı

Scrace

et al. 2016

Applied Physics Letters

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We used photoluminescence spectroscopy to resolve two emission features in CdSe/CdMnS/CdS and CdSe/CdS core/multi-shell nanoplatelet heterostructures. The photoluminescence from the magnetic sample has a positive circular polarization with a maximum centered at the position of the lower energy feature. The higher energy feature has a corresponding signature in the absorption spectrum; this is not the case for the low-energy feature. We have also studied the temporal evolution of these features using a pulsed-excitation/time-resolved photoluminescence technique to investigate their corresponding recombination channels. A model was used to analyze the temporal dynamics of the photoluminescence which yielded two distinct timescales associated with these recombination channels. The above results indicate that the low-energy feature is associated with recombination of electrons with holes localized at the core/shell interfaces; the high-energy feature, on the other hand, is excitonic in nature with the holes confined within the CdSe cores.

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Optical nonlinearities and carrier trapping dynamics in CdS and CuxS nanocrystals

Cited by 50 publications

References 30 publications

Ultrafast carrier dynamics in CdS-doped glasses

Ultrafast carrier dynamics in CdS-doped glasses

Morphology and Composition-Controls of Cu<I><SUB>x</SUB></I>S Nanocrystals Using Alkyl-Amine Ligands

Time-resolved photoluminescence study of CdSe/CdMnS/CdS core/multi-shell nanoplatelets

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