Time Resolved Nano-Optical Spectroscopy of Coherently Excited Semiconductor Quantum Dots

2000 ◽  
Author(s):  
Duncan G. Steel
Keyword(s):  
Quantum Dots ◽  
Optical Spectroscopy ◽  
Semiconductor Quantum Dots ◽  
Time Resolved

Dynamics of Excitons in Single Semiconductor Quantum Dots Probed by Time-Resolved Optical Spectroscopy

2001 ◽  
Vol 224 (2) ◽  
pp. 343-348 ◽  
Author(s):  
D.V. Regelman ◽  
E. Dekel ◽  
D. Gershoni ◽  
W.V. Schoenfeld ◽  
P.M. Petroff
Keyword(s):  
Quantum Dots ◽  
Optical Spectroscopy ◽  
Semiconductor Quantum Dots ◽  
Time Resolved

Excited excitonic states observed in semiconductor quantum dots using polarization resolved optical spectroscopy

2007 ◽  
Vol 101 (8) ◽  
pp. 081703 ◽  
Author(s):  
V. Troncale ◽  
K. F. Karlsson ◽  
D. Y. Oberli ◽  
M. Byszewski ◽  
A. Malko ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Spectroscopy ◽  
Semiconductor Quantum Dots ◽  
Excitonic States

Space and time resolved coherent optical spectroscopy of single quantum dots

2004 ◽  
Vol 19 (4) ◽  
pp. S260-S263 ◽  
Author(s):  
Thomas Unold ◽  
Kerstin Mueller ◽  
Christoph Lienau ◽  
Thomas Elsaesser
Keyword(s):  
Quantum Dots ◽  
Optical Spectroscopy ◽  
Single Quantum ◽  
Time Resolved ◽  
Space And Time ◽  
Single Quantum Dots ◽  
Coherent Optical Spectroscopy

Femtosecond time-resolved hot carrier energy distributions of photoexcited semiconductor quantum dots

2012 ◽  
Vol 525 (1-2) ◽  
pp. 43-48 ◽  
Author(s):  
Chi-Hung Chuang ◽  
Xiaobo Chen ◽  
Clemens Burda
Keyword(s):  
Quantum Dots ◽  
Semiconductor Quantum Dots ◽  
Energy Distributions ◽  
Time Resolved ◽  
Hot Carrier ◽  
Carrier Energy

scholarly journals Size-Dependent Non-FRET Photoluminescence Quenching in Nanocomposites Based on Semiconductor Quantum Dots CdSe/ZnS and Functionalized Porphyrin Ligands

2012 ◽  
Vol 2012 ◽  
pp. 1-14 ◽  
Author(s):  
Eduard I. Zenkevich ◽  
Thomas Blaudeck ◽  
Alexander Milekhin ◽  
Christian von Borczyskowski
Keyword(s):  
Quantum Dots ◽  
Charge Transfer ◽  
Semiconductor Quantum Dots ◽  
Trap States ◽  
Quenching Rate ◽  
Time Resolved ◽  
Exciton Wave Function ◽  
Electron Hole Pair ◽  
Colloidal Semiconductor ◽  
Pl Quenching

We review recent experimental work to utilize the size dependence of the luminescence quenching of colloidal semiconductor quantum dots induced by functionalized porphyrin molecules attached to the surface to describe a photoluminescence (PL) quenching process which is different from usual models of charge transfer (CT) or Foerster resonant energy transfer (FRET). Steady-state and picosecond time-resolved measurements were carried out for nanocomposites based on colloidal CdSe/ZnS and CdSe quantum dots (QDs) of various sizes and surfacely attached tetra-mesopyridyl-substituted porphyrin molecules (“Quantum Dot-Porphyrin” nanocomposites), in toluene at 295 K. It was found that the major part of the observed strong quenching of QD PL in “QD-Porphyrin” nanocomposites can neither be assigned to FRET nor to photoinduced charge transfer between the QD and the chromophore. This PL quenching depends on QD size and shell and is stronger for smaller quantum dots: QD PL quenching rate constants scale inversely with the QD diameter. Based on the comparison of experimental data and quantum mechanical calculations, it has been concluded that QD PL quenching in “QD-Porphyrin” nanocomposites can be understood in terms of a tunneling of the electron (of the excited electron-hole pair) followed by a (self-) localization of the electron or formation of trap states. The major contribution to PL quenching is found to be proportional to the calculated quantum-confined exciton wave function at the QD surface. Our findings highlight that single functionalized molecules can be considered as one of the probes for the complex interface physics and dynamics of colloidal semiconductor QD.

Steady-State and Time-Resolved Near-Field Optical Spectroscopy of GaN/AlN Quantum Dots and InGaN/GaN Quantum Wells

2002 ◽  
Vol 190 (1) ◽  
pp. 155-160 ◽  
Author(s):  
J. Kudrna ◽  
P.G. Gucciardi ◽  
A. Vinattieri ◽  
M. Colocci ◽  
B. Damilano ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Steady State ◽  
Quantum Wells ◽  
Optical Spectroscopy ◽  
Near Field ◽  
Time Resolved

Theory of time-resolved Raman scattering and fluorescence emission from semiconductor quantum dots

2010 ◽  
Vol 81 (7) ◽  
Author(s):  
Julia Kabuss ◽  
Stefan Werner ◽  
Axel Hoffmann ◽  
Peter Hildebrandt ◽  
Andreas Knorr ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Raman Scattering ◽  
Fluorescence Emission ◽  
Semiconductor Quantum Dots ◽  
Time Resolved
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