Transformation of Photoluminescence Spectra at the Liposomal Encapsulation of Quantum Dots

2016 ◽  
Vol 4 (0) ◽  
pp. 27 ◽  
Author(s):  
Cesar Raymundo Gonzalez Vargas ◽  
Janna Douda ◽  
Alba Adriana Vallejo Cardona ◽  
Jose Luis Casas Espinola
Keyword(s):  
Quantum Dots ◽  
Photoluminescence Spectra

scholarly journals Exciton-Related Raman Scattering, Interband Absorption and Photoluminescence in Colloidal Cdse/Cds Core/Shell Quantum Dots Ensemble

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1274
Author(s):  
Grigor A. Mantashian ◽  
Paytsar A. Mantashyan ◽  
Hayk A. Sarkisyan ◽  
Eduard M. Kazaryan ◽  
Gabriel Bester ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Raman Scattering ◽  
Cross Section ◽  
Core Shell ◽  
Interband Absorption ◽  
Photoluminescence Spectra ◽  
Cds Quantum Dots ◽  
Mass Approximation ◽  
Numerical Discretization ◽  
Size Dispersion

By using the numerical discretization method within the effective-mass approximation, we have theoretically investigated the exciton-related Raman scattering, interband absorption and photoluminescence in colloidal CdSe/CdS core/shell quantum dots ensemble. The interband optical absorption and photoluminescence spectra have been revealed for CdSe/CdS quantum dots, taking into account the size dispersion of the ensemble. Numerical calculation of the differential cross section has been presented for the exciton-related Stokes–Raman scattering in CdSe/CdS quantum dots ensemble with different mean sizes.

Temperature dependence of photoluminescence spectra of self-organized CdSe quantum dots

2000 ◽  
Vol 214-215 ◽  
pp. 770-773 ◽  
Author(s):  
Yasuhiro Murase ◽  
Takeshi Ota ◽  
Nobuhiro Yasui ◽  
Akihiro Shikimi ◽  
Tsuguki Noma ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Temperature Dependence ◽  
Cdse Quantum Dots ◽  
Photoluminescence Spectra ◽  
Self Organized

Temperature-Dependent Photoluminescence Spectra of PbSe Quantum Dots for Temperature Markers

2012 ◽  
Vol 482-484 ◽  
pp. 2547-2550
Author(s):  
Peng Fei Gu ◽  
Ya Nan Wang ◽  
Jia Jia Cao ◽  
Yu Yan ◽  
Tie Qiang Zhang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Temperature Sensitivity ◽  
Peak Position ◽  
Strong Temperature Dependence ◽  
Photoluminescence Spectra ◽  
Temperature Dependent ◽  
Temperature Variations ◽  
Temperature Changes ◽  
Optical Readout ◽  
Temperature Dependent Photoluminescence

We here report the temperature effect on photoluminescence(PL) spectra of PbSe quantum dots (QDs), which exhibit a strong temperature dependence on their spectra position and intensity. They potentially act as the temperature marker, sensing temperature variations and reporting temperature changes remotely through optical readout. In addition, the temperature sensitivity characterized by peak position of PbSe QDs was found to be 0.39nm/°C in a range of 10-100 °C.

Polarization Spectroscopy of Charged Single Self-Assembled Quantum Dots

2003 ◽  
Vol 789 ◽  
Author(s):  
Morgan E. Ware ◽  
Allan Bracker ◽  
Daniel Gammon ◽  
David Gershoni
Keyword(s):  
Quantum Dots ◽  
Circular Polarization ◽  
Schottky Diode ◽  
Heavy Hole ◽  
Photoluminescence Spectra ◽  
Polarization Spectroscopy ◽  
Charged Exciton ◽  
Self Assembled ◽  
Positively Charged

ABSTRACTWe have demonstrated single dot spectroscopy of InAs/GaAs self-assembled quantum dots embedded in a bias controlled Schottky diode. The photoluminescence spectra exhibit discrete lines depending on bias, which we attribute to the recombination of positively charged, neutral, and negatively charged confined excitons. With excitation directly into the dot, large circular polarization memory is exhibited by the two charged exciton (trion) lines. This indicates long spin lifetimes for both the electron and the heavy hole in the quantum dots.

scholarly journals Resonant photoluminescence and excitation spectroscopy of CdSe/ZnSe and CdTe/ZnTe self-assembled quantum dots

2002 ◽  
Vol 737 ◽  
Author(s):  
T. A. Nguyen ◽  
S. Mackowski ◽  
H. Rho ◽  
H. E. Jackson ◽  
L. M. Smith ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Excited State ◽  
Ground State ◽  
State Transition ◽  
Longitudinal Optical ◽  
Photoluminescence Spectra ◽  
Single Quantum Dots ◽  
Major Carrier ◽  
Excitation Mechanisms ◽  
Self Assembled

ABSTRACTWe show that two major carrier excitation mechanisms are present in II-VI self-assembled quantum dots. The first one is related to direct excited state – ground state transition. It manifests itself by the presence of sharp and intense lines in the excitation spectrum measured from single quantum dots. Apart from these lines, we also observe up to four much broader excitation lines. The energy spacing between these lines indicates that they are associated with absorption related to longitudinal optical phonons. By analyzing resonantly excited photoluminescence spectra, we are able to separate the contributions from these two mechanisms. In the case of CdTe dots, the excited state – ground state relaxation is important for all dots in ensemble, while phonon-assisted processes are dominant for the dots with smaller lateral size.

Size Dependent Electroluminescence from CdSe Nanocrystallites (Quantum Dots)

1994 ◽  
Vol 358 ◽  
Author(s):  
B.O. Dabbousi ◽  
O. Onitsuka ◽  
M.F. Rubner ◽  
M.G. Bawendi
Keyword(s):  
Thin Films ◽  
Quantum Dots ◽  
Room Temperature ◽  
Variable Temperature ◽  
Cryogenic Temperatures ◽  
Photoluminescence Spectra ◽  
Size Dependent

ABSTRACTWe obtain spectrally narrow (FWHM < 40 nm) electroluminescence from nearly monodisperse CdSe nanocrystallites (quantum dots) incorporated into thin films of polyvinyl carbazole (PVK) and an oxadiazole derivative (PBD) sandwiched between aluminum and ITO electrodes. The electroluminescence and photoluminescence spectra are nearly identical at room temperature and are tunable from ∼530 nm to ∼650 nm by varying the size of the dots. Voltage studies at 77K indicate that while only the dots electroluminesce at the lower voltages, both the dots and the PVK matrix electroluminesce at higher applied voltages. Variable temperature studies indicate that the electroluminescence efficiency increases substantially as the films are cooled down to cryogenic temperatures.

Micro photoluminescence spectra of CdTe and CdMnTe self-organized quantum dots

1999 ◽  
Vol 83-84 ◽  
pp. 321-324 ◽  
Author(s):  
T Kuroda ◽  
N Hasegawa ◽  
F Minami ◽  
Y Terai ◽  
S Kuroda ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photoluminescence Spectra ◽  
Self Organized
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