scholarly journals Photoluminescence Spectroscopy of CdTe/ZnTe Self-Assembled Quantum Dots

2009 ◽  
Vol 2009 ◽  
pp. 1-4
Author(s):  
Nebojša Romčević ◽  
Maja Romčević ◽  
Radmila Kostić ◽  
Dušanka Stojanović ◽  
Aleksandra Milutinović ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Barrier Layer ◽  
Ground State ◽  
Energy Band ◽  
High Energy ◽  
Low Energy ◽  
Cdte Quantum Dots ◽  
Pl Emission ◽  
Self Assembled

We present photoluminescence (PL) measurements of two different, 3 monolayers and 12 monolayers (ml), CdTe self-assembled quantum dot (SAQD) samples. The spectra were recorded in the temperature range 20 K–300 K, with photoexcitation over the ZnTe barrier layer. PL spectra displayed two main emission bands. High-energy PL emission(E1)is ZnTe LO like phonon- (ωLO= 204.2 cm−1(3 ml),ωLO= 207.3 cm−1(12 ml)) assisted deexcitation. Dominant low-energy band(E2)presents the direct deexcitation to ground state of the CdTe quantum dots.

Electrically driven assembly of CdTe quantum dots into photoconductive microwires

2015 ◽  
Vol 3 (8) ◽  
pp. 1645-1648 ◽  
Author(s):  
Gaurav Maheshwari ◽  
Mona Mittal ◽  
Sameer Sapra ◽  
Shalini Gupta
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Low Cost ◽  
Optoelectronic Device ◽  
Low Energy ◽  
Cdte Quantum Dots ◽  
One Dimensional ◽  
Device Applications ◽  
Nanocrystal Assembly

Low energy, low cost quantum dot nanocrystal assembly into one-dimensional microwires for optoelectronic device applications.

Efficient quantum dot-sensitized solar cell with tunable energy band CdSexS(1−x) quantum dots

2012 ◽  
Vol 22 (21) ◽  
pp. 10525 ◽  
Author(s):  
Ting Shu ◽  
Ziming Zhou ◽  
Heng Wang ◽  
Guanghui Liu ◽  
Peng Xiang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solar Cell ◽  
Quantum Dot ◽  
Energy Band

The Effect of Upper Barrier Layer Growth on Self-Assembled CdSe Quantum Dots

2002 ◽  
Vol 229 (1) ◽  
pp. 457-461
Author(s):  
Y. Murase ◽  
K. Maehashi ◽  
T. Hanada ◽  
Y. Hirotsu ◽  
H. Nakashima
Keyword(s):  
Quantum Dots ◽  
Barrier Layer ◽  
Layer Growth ◽  
Cdse Quantum Dots ◽  
Self Assembled

scholarly journals Rapidly detecting antibiotics with magnetic nanoparticle coated CdTe quantum dots

RSC Advances ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 1966-1970 ◽  
Author(s):  
Chao-Xi Chen ◽  
Yu-Han Li ◽  
Yun-Lu Zhou ◽  
Jun-Hao Zhang ◽  
Qi-Zhuang Wei ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Magnetic Property ◽  
Quantum Dot ◽  
Magnetic Nanoparticle ◽  
Cdte Quantum Dots ◽  
Good Magnetic Property ◽  
High Fluorescence

A reusable magnetic-quantum dot material with good magnetic property and high fluorescence retention can qualitatively and quantitatively detect four kinds of antibiotics.

Heterogeneous structured MoSe2–MoO3 quantum dots with enhanced sodium/potassium storage

2020 ◽  
Vol 8 (44) ◽  
pp. 23395-23403
Author(s):  
Wen Liu ◽  
Jujun Yuan ◽  
Youchen Hao ◽  
Hirbod Maleki Kheimeh Sari ◽  
Jingjing Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Electrochemical Performance ◽  
Heterogeneous Structure ◽  
Sodium Potassium ◽  
Self Assembled ◽  
First Time

A quantum dot-assisted self-assembled MoSe2–MoO3 heterogeneous structure is investigated for sodium/potassium storage for the first time. The quantum dot-assisted self-assembled MoSe2–MoO3 anode possesses a better electrochemical performance.

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.

scholarly journals Temperature dependence of ultrasharp luminescence lines in AlyIn1−yAs/AlxGa1−xAs self-assembled quantum dots

1996 ◽  
Vol 74 (S1) ◽  
pp. 216-219 ◽  
Author(s):  
S. Raymond ◽  
S. Fafard ◽  
S. Charbonneau
Keyword(s):  
Quantum Dots ◽  
Ground State ◽  
State Transition ◽  
Thermionic Emission ◽  
Excitation Density ◽  
High Excitation ◽  
Temperature Dependent ◽  
Time Resolved ◽  
Self Assembled ◽  
Intensity Evolution

Ensembles of~600 AlyIn1−yAs/AlxGa1−xAs self-assembled quantum dots (QDs) are investigated using photoluminescence (PL) and time-resolved PL in the visible. At very low excitation intensities, the PL spectrum shows multiple ultranarrow luminescence lines (FWHM ~200 μeV), which are attributed to the ground-state transition of a few dots (4 or less). The temperature and intensity evolution of these sharp lines is then monitored. The temperature-dependent measurements show that the line width and lifetime of the narrow lines remain constant up to the onset of thermionic, emission. Intensity-dependent measurements show that for high excitation density the collective background, emitted by the ensemble of QDs, is enhanced relative to the amplitude of individual ultranarrow lines.

Enhanced Fluorescence from CdTe Quantum Dots Self-Assembled on the Surface of Silver Nanoparticles

2010 ◽  
Vol 10 (3) ◽  
pp. 2099-2103 ◽  
Author(s):  
L. M. An ◽  
Y. Q. Yang ◽  
W. H. Su ◽  
J. Yi ◽  
C. X. Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Silver Nanoparticles ◽  
Cdte Quantum Dots ◽  
Enhanced Fluorescence ◽  
Self Assembled
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