scholarly journals Optical and Magneto-Optical Properties of Donor-Bound Excitons in Vacancy-Engineered Colloidal Nanocrystals

Nano Letters ◽  
2021 ◽  
Author(s):  
Francesco Carulli ◽  
Valerio Pinchetti ◽  
Matteo L. Zaffalon ◽  
Andrea Camellini ◽  
Silvia Rotta Loria ◽  
...  
Keyword(s):  
Optical Properties ◽  
Colloidal Nanocrystals

Effects of Gamma Irradiation on Optical Properties of Colloidal Nanocrystals

2007 ◽  
Vol 1038 ◽  
Author(s):  
Nathan J Withers ◽  
Krishnaprasad Sankar ◽  
Brian A. Akins ◽  
Tosifa A. Memon ◽  
Jiangjiang Gu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Gamma Irradiation ◽  
Irradiation Dose ◽  
Nanocrystalline Material ◽  
Light Output ◽  
Colloidal Nanocrystals ◽  
Photoluminescence Intensity ◽  
Photoluminescence Properties ◽  
Material Systems ◽  
Dose Radiation

AbstractThe effects of 137Cs gamma irradiation on photoluminescence properties, such as spectra, light output, and lifetime, of several types of colloidal nanocrystals have been investigated. Irradiation-induced damage testing was performed on CdSe/ZnS, LaF3:Eu, LaF3:Ce, ZnO, and PbI2 nanocrystals synthesized on a Schlenk line using appropriate solvents and precursors. Optical degradation of the nanocrystals was evaluated based on the measured dependence of their photoluminescence intensity on the irradiation dose. Radiation hardness varies significantly between various nanocrystalline material systems.

Effects of Cu Dopant on Lattice and Optical Properties of ZnS Quantum Dots

2016 ◽  
Vol 16 (4) ◽  
pp. 3816-3820
Author(s):  
Lu Shuhua ◽  
Wang Aiji ◽  
Chen Tingfang ◽  
Wang Yinshu
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Quantum Dot ◽  
Blue Shift ◽  
Red Shift ◽  
Colloidal Nanocrystals ◽  
Long Tail ◽  
Low Concentrations ◽  
Cu Dopant ◽  
Cu Ions

Doped and undoped ZnS colloidal nanocrystals have drawn much attention due to their versatile applications in the fields of optoelectronics and biotechnology. In this paper, Cu doped ZnS quantum dots were synthesized via the simple thermolysis of ethylxanthate salts. The lattice and optical properties of the nanocrystals were then studied in detail. The quantum dot lattice contracted linearly between Cu concentrations of 0.2–2%, while it continued to contract more gradually as Cu concentrations were further increased from 4 to 6%, due in part to the Cu ions located on the surface of the ZnS lattice. Cu incorporation induces a long tail in absorption at long wavelengths. The PL spectrum shows a red shift at first, and then a blue shift with increases in Cu concentration. Cu doped at low concentrations (0.2–1%) enhanced the emission, while high Cu concentrations (2–6%) quenched emissions.

Synthesis, structure, optical properties, and band gap tuning of Fe:ZnSe colloidal nanocrystals

2014 ◽  
Vol 249 ◽  
pp. 42-47 ◽  
Author(s):  
Ruishi Xie ◽  
Yuanli Li ◽  
Xingquan Zhang ◽  
Haifeng Liu
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Colloidal Nanocrystals ◽  
Band Gap Tuning

Auger Recombination of Biexcitons and Charged Excitons in CdSe/CdS core/shell Nanocrystals

2012 ◽  
Vol 1409 ◽  
Author(s):  
Marco Marceddu ◽  
Michele Saba ◽  
Francesco Quochi ◽  
Adriano Lai ◽  
Jing Huang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Ultrafast Spectroscopy ◽  
Auger Recombination ◽  
Colloidal Nanocrystals ◽  
Core Shell ◽  
Light Emitting ◽  
Fluorescence Blinking

ABSTRACTCdSe/CdS colloidal nanocrystals are light-emitting nanoparticles with remarkable optical properties such as suppressed fluorescence blinking and enhanced emission from multiexciton states. These properties have been attributed to the suppression of non-radiative Auger recombination. In this work we employ ultrafast spectroscopy techniques to identify optical signatures of neutral and charged excitonic and multiexcitonic states.

Colloidal nanocrystals integrated in epitaxial nanostructures: structural and optical properties

2006 ◽  
Vol 3 (4) ◽  
pp. 861-864 ◽  
Author(s):  
Ch. Arens ◽  
N. Roussau ◽  
D. Schikora ◽  
K. Lischka ◽  
O. Schöps ◽  
...  
Keyword(s):  
Optical Properties ◽  
Colloidal Nanocrystals ◽  
Structural And Optical Properties

Synthesis and optical properties of Mn2+-doped Cd–In–S colloidal nanocrystals

2020 ◽  
Vol 55 (27) ◽  
pp. 12801-12810
Author(s):  
Sheng Cao ◽  
Chencheng Dai ◽  
Shangfei Yao ◽  
Bingsuo Zou ◽  
Jialong Zhao
Keyword(s):  
Optical Properties ◽  
Colloidal Nanocrystals

Recent advances on single photon sources based on single colloidal nanocrystals

2010 ◽  
Vol 18 (1) ◽  
pp. 1-9 ◽  
Author(s):  
M. Vittorio ◽  
F. Pisanello ◽  
L. Martiradonna ◽  
A. Qualtieri ◽  
T. Stomeo ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Single Photon ◽  
Life Time ◽  
Colloidal Quantum Dots ◽  
Optical Systems ◽  
Colloidal Nanocrystals ◽  
Single Photons ◽  
Light Emitting Devices ◽  
Photon Sources

AbstractSingle colloidal quantum dots (QDs) are increasingly exploited as triggered sources of single photons. This review reports on recent results on single photon sources (SPS) based on colloidal quantum dots, whose size, shape and optical properties can be finely tuned by wet chemistry approach. First, we address the optical properties of different colloidal nanocrystals, such as dots, rods and dot in rods and their use as single photon sources will be discussed. Then, we describe different techniques for isolation and positioning single QDs, a major issue for fabrication of single photon sources, and various approaches for the embedding single nanocrystals inside microcavities. The insertion of single colloidal QDs in quantum confined optical systems allows one to improve their overall optical properties and performances in terms of efficiency, directionality, life time, and polarization control. Finally, electrical pumping of colloidal nanocrystals light emitting devices and of NC-based single photon sources is reviewed.

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