Two different mechanisms of formation of quantum dots in borosilicate glass

2001 ◽  
Vol 13 (27) ◽  
pp. 6123-6131 ◽  
Author(s):  
M Hikmet Yükselici
Keyword(s):  
Quantum Dots ◽  
Borosilicate Glass ◽  
Mechanisms Of Formation

Nanostructure of semiconductor quantum dots in a borosilicate glass matrix by complementary use of HREM and AEM

1990 ◽  
Vol 48 (4) ◽  
pp. 728-729
Author(s):  
M.J. Kim ◽  
L.C. Liu ◽  
S.H. Risbud ◽  
R.W. Carpenter
Keyword(s):  
Quantum Dots ◽  
Borosilicate Glass ◽  
Glass Matrix ◽  
Optical Switching ◽  
Response Times ◽  
Fast Response ◽  
Processing Technique ◽  
Internal Stresses ◽  
Electron Hole ◽  
Spatial Dimensions

When the size of a semiconductor is reduced by an appropriate materials processing technique to a dimension less than about twice the radius of an exciton in the bulk crystal, the band like structure of the semiconductor gives way to discrete molecular orbital electronic states. Clusters of semiconductors in a size regime lower than 2R {where R is the exciton Bohr radius; e.g. 3 nm for CdS and 7.3 nm for CdTe) are called Quantum Dots (QD) because they confine optically excited electron- hole pairs (excitons) in all three spatial dimensions. Structures based on QD are of great interest because of fast response times and non-linearity in optical switching applications.In this paper we report the first HREM analysis of the size and structure of CdTe and CdS QD formed by precipitation from a modified borosilicate glass matrix. The glass melts were quenched by pouring on brass plates, and then annealed to relieve internal stresses. QD precipitate particles were formed during subsequent "striking" heat treatments above the glass crystallization temperature, which was determined by differential thermal analysis.

Growth of CdSSe quantum dots in borosilicate glass by controlled heat treatment for band gap engineering

2018 ◽  
Vol 86 ◽  
pp. 424-432 ◽  
Author(s):  
S.R. Munishwar ◽  
P.P. Pawar ◽  
S.Y. Janbandhu ◽  
R.S. Gedam
Keyword(s):  
Heat Treatment ◽  
Quantum Dots ◽  
Band Gap ◽  
Borosilicate Glass ◽  
Band Gap Engineering

Silver nanoparticles enhanced luminescence and stability of CsPbBr 3 perovskite quantum dots in borosilicate glass

2020 ◽  
Vol 103 (4) ◽  
pp. 2463-2470 ◽  
Author(s):  
Ke Zhang ◽  
Dacheng Zhou ◽  
Jianbei Qiu ◽  
Zhangwen Long ◽  
Rui Zhu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Silver Nanoparticles ◽  
Borosilicate Glass ◽  
Perovskite Quantum Dots ◽  
Enhanced Luminescence

Development of Low Size Dispersion, High Volume Fraction and Strong Quantum Confined CdSxSe1-x Quantum Dots Embedded in Borosilicate Glass Matrix and Study of their Optical Properties

2007 ◽  
Vol 31 ◽  
pp. 161-163 ◽  
Author(s):  
A. Verma ◽  
P.K. Bhatnagar ◽  
P.C. Mathur ◽  
S. Nagpal ◽  
P.K. Pandey ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Borosilicate Glass ◽  
Quantum Confinement ◽  
Glass Matrix ◽  
Volume Fraction ◽  
High Volume ◽  
High Volume Fraction ◽  
Annealing Duration ◽  
Colored Glass ◽  
Size Dispersion

Quantum Dots (QDs) of CdSxSe1-x embedded in borosilicate glass matrix (BGM) have been grown using colored glass filter (RG695). Double-Step (DS) annealing method was adopted in which nucleation is achieved at a lower temperature (475°C) without any crystallization. To obtain crystallization on these nucleation centers, the annealing temperature is raised to 575°C at which the nucleation rate is negligible. QDs of various average radii and volume fractions are grown by varying the annealing duration from 3 to 11hrs. QDs corresponding to higher annealing duration are found to have low size dispersion (SD) and high volume fraction but weak quantum confinement, while, the QDs corresponding to lower annealing durations have high quantum confinement due to their much lower radii as compare to Bohr exciton radius, their SD is high and volume fraction low. For nonlinear optical applications the SD must be low and volume fraction should be high. Attempt has been made to optimize the two parameters. Further it has been concluded that there is no contribution of the band edge recombination to the PL and the origin of the PL is due to shallow traps existing in the volume of the QDs. Studies of absorption and PL have also been made on the samples aged for 18, 24 and 36 months. It is found that the effect of aging is to increase the absorption coefficient, reduce the shallow trap centers and reduce the SD.

CdTe quantum dots in Era3+-doped borosilicate glass

1996 ◽  
Vol 15 (21) ◽  
pp. 1879-1881 ◽  
Author(s):  
V. C. S. Reynoso ◽  
Y. Liu ◽  
R. F. C. Royas ◽  
J. A. Medeiros Neto ◽  
A. M. De Paula ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Borosilicate Glass ◽  
Cdte Quantum Dots

Third-order Nonlinear Optical Properties of Silver Quantum Dots Doped in Sodium Borosilicate Glass

2013 ◽  
Vol 28 (9) ◽  
pp. 1003-1008 ◽  
Author(s):  
Xiu-Li ZHAO ◽  
Xiao-Juan LIANG ◽  
Hong-Yan LUO ◽  
Zhao-Ping CHEN ◽  
Wei-Dong XIANG
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Borosilicate Glass ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Sodium Borosilicate Glass ◽  
Third Order

CO2 laser-induced precipitation of CdSxSe1−x nanoparticles in a borosilicate glass: A new approach for the localized growth of quantum dots

2015 ◽  
Vol 42 ◽  
pp. 331-334 ◽  
Author(s):  
Christophe Kinowski ◽  
Odile Robbe-Cristini ◽  
Rémy Bernard ◽  
Hicham El Hamzaoui ◽  
Luc Boussekey ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Co2 Laser ◽  
Borosilicate Glass ◽  
New Approach

Rb+-doped CsPbBr3 quantum dots with multi-color stabilized in borosilicate glass via crystallization

2020 ◽  
Vol 40 (1) ◽  
pp. 94-102 ◽  
Author(s):  
Huiling Zhang ◽  
Rongrong Yuan ◽  
Mengfeifei Jin ◽  
Zelong Zhang ◽  
Yanxia Yu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Borosilicate Glass ◽  
Cspbbr3 Quantum Dots
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