Colloidal Semiconductor Quantum Dots with Tunable Surface Composition

Nano Letters ◽  
2012 ◽  
Vol 12 (9) ◽  
pp. 4465-4471 ◽  
Author(s):  
Helen Hsiu-Ying Wei ◽  
Christopher M. Evans ◽  
Brett D. Swartz ◽  
Amanda J. Neukirch ◽  
Jeremy Young ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface Composition ◽  
Semiconductor Quantum Dots ◽  
Colloidal Semiconductor

In situ SAXS probing the evolution of the precursors and onset of nucleation of ZnSe colloidal semiconductor quantum dots

2020 ◽  
Vol 56 (13) ◽  
pp. 2031-2034 ◽  
Author(s):  
Xiaoyu Hao ◽  
Meng Chen ◽  
LinXi Wang ◽  
Zhaopeng Cao ◽  
Yan Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Semiconductor Quantum Dots ◽  
Conversion Reaction ◽  
Colloidal Semiconductor ◽  
Nucleation Growth

The effect of diphenyl phosphine (HPPh2) on precursors conversion reaction and nucleation/growth of quantum dots (QDs) were in situ investigated by the combination of SAXS and UV-vis.

scholarly journals Full solution processed mesostructured optical resonators integrating colloidal semiconductor quantum dots

Nanoscale ◽  
2015 ◽  
Vol 7 (40) ◽  
pp. 16583-16589 ◽  
Author(s):  
Mauricio E. Calvo ◽  
Nuria Hidalgo ◽  
Roland Schierholz ◽  
András Kovács ◽  
Asunción Fernández ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Cavity ◽  
Optical Resonators ◽  
Semiconductor Quantum Dots ◽  
Solution Processed ◽  
Synthetic Pathway ◽  
Colloidal Semiconductor ◽  
Full Solution

Herein we show a solution based synthetic pathway to obtain a resonant optical cavity with embedded colloidal semiconductor quantum dots (CSQDs).

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.

Chiral photonic bandgap microcavities doped with single colloidal semiconductor quantum dots

2010 ◽  
Author(s):  
Luke J. Bissell ◽  
Svetlana G. Lukishova ◽  
Ansgar W. Schmid ◽  
Megan A. Hahn ◽  
Chris M. Evans ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photonic Bandgap ◽  
Semiconductor Quantum Dots ◽  
Colloidal Semiconductor

Monitoring activity of living cells marked with colloidal semiconductor quantum dots

2006 ◽  
Author(s):  
Patricia M. A. Farias ◽  
Beate S. Santos ◽  
Frederico D. Menezes ◽  
Aluizio G. Brasil Jr. ◽  
Liliane B. Lima ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Living Cells ◽  
Semiconductor Quantum Dots ◽  
Colloidal Semiconductor ◽  
Monitoring Activity

Blinking mechanism of colloidal semiconductor quantum dots: Blinking mechanisms

2007 ◽  
Vol 6 (1-3) ◽  
pp. 301-304 ◽  
Author(s):  
Mitra Dutta ◽  
Michael A. Stroscio ◽  
Milana Vasudev ◽  
Dinakar Ramadurai ◽  
Leianne Torres ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Semiconductor Quantum Dots ◽  
Colloidal Semiconductor
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