scholarly journals Photooxidation and Photobleaching of Single CdSe/ZnS Quantum Dots Probed by Room-Temperature Time-Resolved Spectroscopy

2001 ◽  
Vol 105 (35) ◽  
pp. 8281-8284 ◽  
Author(s):  
Wilfried G. J. H. M. van Sark ◽  
Patrick L. T. M. Frederix ◽  
Dave J. Van den Heuvel ◽  
Hans C. Gerritsen ◽  
Ageeth A. Bol ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Room Temperature ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Temperature Time

Time-resolved spectroscopy of single quantum dots

1998 ◽  
Vol 2 (1-4) ◽  
pp. 588-593 ◽  
Author(s):  
Ph Roussignol ◽  
W Heller ◽  
A Filoramo ◽  
U Bockelmann
Keyword(s):  
Quantum Dots ◽  
Single Quantum ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Single Quantum Dots

Photoluminescence of Di-Ureasil Hybrids Doped with Silica Coated Ag Nanoparticles

2006 ◽  
Vol 514-516 ◽  
pp. 113-117
Author(s):  
Victor I. Boev ◽  
Rute A. Sá Ferreira ◽  
Sonia S. Nobre ◽  
Carlos J.R. Silva ◽  
M.J.M. Gomes ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Room Temperature ◽  
Broad Emission Band ◽  
Time Resolved ◽  
Resonance Band ◽  
The Matrix ◽  
Metal Doped ◽  
Filtering Effect ◽  
Temperature Time ◽  
Blue Spectral Region

Photoluminescence of di-ureasil hybrids containing homogeneously dispersed Ag nanoparticles, covered with silica shells was investigated at room temperature and compared with emission of undoped hybrids. Metal-doped di-ureasils show a broad emission band in the blue spectral region similar to what has been observed in pure di-ureasils but with lower relative intensity. A broad minimum arises around 438 nm for Ag@SiO2 - containing di-ureasils which coincides with the peak of plasmon resonance band in the absorption spectrum. This behaviour can be attributed to inner filtering effect, which manifests itself as absorption by metal nanoparticles of light emitted from the matrix. Low-temperature time-resolved spectroscopy and lifetime measurements demonstrate that changes are induced in the time-scale behind the di-ureasil host emission when the nanoparticles are incorporated. In particular, the lifetime values for Ag@SiO2- doped di-ureasils are smaller than those measured for the undoped host, suggesting that energy transfer might exist between the hybrid's emitting centres (NH groups and siliceous nanodomains) and the nanoparticles.

Time-resolved spectroscopy of InAsP/InP(001) quantum dots emitting near 2 μm

2010 ◽  
Vol 97 (13) ◽  
pp. 131907 ◽  
Author(s):  
D. Elvira ◽  
A. Michon ◽  
B. Fain ◽  
G. Patriarche ◽  
G. Beaudoin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Time Resolved ◽  
Time Resolved Spectroscopy

Control of Spontaneous Emission from Colloidal Quantum Dots in a Polymer Microcavity

2006 ◽  
Vol 959 ◽  
Author(s):  
Vinod Menon ◽  
Nikesh Valappil ◽  
Iosef Zeylikovich ◽  
Taposh Gayen ◽  
Bidyut Das ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Spontaneous Emission ◽  
Defect Layer ◽  
Bragg Reflectors ◽  
Spontaneous Emission Rate ◽  
Time Resolved ◽  
One Dimensional ◽  
The One ◽  
Time Resolved Photoluminescence ◽  
Temperature Time

ABSTRACTWe report the fabrication of a one dimensional microcavity structure embedded with colloidal CdSe/ZnS core/shell quantum dots using solution processing. The microcavity structures were fabricated by spin coating alternating layers of polymers of different refractive indices (poly-vinylcarbazole, and poly-acrylic acid) to form the distributed Bragg reflectors (DBRs). Greater than 90% reflectivity was obtained using ten periods of the structure. The one dimensional microcavity was formed by sandwiching a λ/n thick defect layer between two such DBRs. The microcavity demonstrated directionality in emission and well behaved dispersion characteristics. Room temperature time-resolved photoluminescence measurements carried out on this structure showed six fold enhancement of spontaneous emission rate. The photoluminescence decay time of the quantum dots was found to be ∼ 1 ns while for the quantum dots embedded in the microcavity it was ∼150 ps.

Roles of adsorption sites in electron transfer from CdS quantum dots to molecular catalyst cobaloxime studied by time-resolved spectroscopy

2016 ◽  
Vol 18 (26) ◽  
pp. 17389-17397 ◽  
Author(s):  
Yun Ye ◽  
Yuxing Xu ◽  
Lei Huang ◽  
Dayong Fan ◽  
Zhaochi Feng ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electron Transfer ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Cds Quantum Dots ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Molecular Catalyst ◽  
Adsorption Sites

Electron transfer from CdS quantum dots (QDs) to cobaloxime (Co(dmgH)2pyCl) is demonstrated by transient absorption spectroscopy (TAS), and further confirmed using photoluminescence (PL) techniques.

scholarly journals Fiber-based cryogenic and time-resolved spectroscopy of PbS quantum dots

2011 ◽  
Vol 19 (3) ◽  
pp. 1786 ◽  
Author(s):  
Matthew T. Rakher ◽  
Ranojoy Bose ◽  
Chee Wei Wong ◽  
Kartik Srinivasan
Keyword(s):  
Quantum Dots ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Pbs Quantum Dots
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