Influence of Glass Composition on the Luminescence Mechanisms of CdSe Quantum-Dot-Doped Glasses

2021 ◽  
Vol 125 (34) ◽  
pp. 18916-18926
Author(s):  
Wenke Li ◽  
Xiujian Zhao ◽  
Chao Liu ◽  
François-Xavier Coudert
Keyword(s):  
Quantum Dot ◽  
Glass Composition ◽  
Cdse Quantum Dot ◽  
Doped Glasses

scholarly journals Influence of Glass Composition on the Luminescence Mechanisms of CdSe Quantum Dot-Doped Glasses

2021 ◽  
Author(s):  
Wenke Li ◽  
Xiujian Zhao ◽  
Chao Liu ◽  
François-Xavier Coudert
Keyword(s):  
Quantum Dot ◽  
Atomic Structure ◽  
Density Functional ◽  
Glass Composition ◽  
Matrix Composition ◽  
Na2o Content ◽  
Cdse Quantum Dot ◽  
Doped Glasses ◽  
Glass Matrices ◽  
The Impact

<div> <div> <div> <p>In this work, we characterized the electronic structure of CdSe quantum dots embedded in a series of x Na2O, (1–x) SiO2 glass matrices (x = 0, 0.25, 0.33 and 0.5). We analyzed the impact of the glass matrix composition on both the atomic structure of the quantum dot (QD) and the QD/glass interface, as well as the luminescence mechanisms, using density functional theory (DFT) calculations. The increase of Na2O content in the glass matrices was found to promote the formation of Cd–O and Se–Na interfacial bonds, and disrupting the Cd–Se bonds network. In particular, we show that the glass composition directly affects the nature of the highest occupied molecular orbitals (HOMO). According to the atomic structure, the band gap distribution and the density of states calculation, we find that there is significant reconstruction of the QD, and that the picture sometimes proposed of a “pristine QD” surrounded by glass is not realistic. The introduction of CdSe QD significantly decreased the bandgap of the glass compared to pristine glasses, and the interfacial bonds greatly contributed to the frontier orbitals without forming midgap states. We propose a new energy diagram, quite different from the traditional model, to explain the luminescence of CdSe quantum dot- doped glasses, originating from the intrinsic emission of this hybrid system {QD + glass}. These results improve our understanding of the luminescence of CdSe quantum dot-doped glasses, explaining the reason for the poor quantum efficiency and broad emission linewidth compared with their colloidal counterparts. </p> </div> </div> </div>

scholarly journals Influence of Glass Composition on the Luminescence Mechanisms of CdSe Quantum Dot-Doped Glasses

2021 ◽  
Author(s):  
Wenke Li ◽  
Xiujian Zhao ◽  
Chao Liu ◽  
François-Xavier Coudert
Keyword(s):  
Quantum Dot ◽  
Atomic Structure ◽  
Density Functional ◽  
Glass Composition ◽  
Matrix Composition ◽  
Na2o Content ◽  
Cdse Quantum Dot ◽  
Doped Glasses ◽  
Glass Matrices ◽  
The Impact

<div> <div> <div> <p>In this work, we characterized the electronic structure of CdSe quantum dots embedded in a series of x Na2O, (1–x) SiO2 glass matrices (x = 0, 0.25, 0.33 and 0.5). We analyzed the impact of the glass matrix composition on both the atomic structure of the quantum dot (QD) and the QD/glass interface, as well as the luminescence mechanisms, using density functional theory (DFT) calculations. The increase of Na2O content in the glass matrices was found to promote the formation of Cd–O and Se–Na interfacial bonds, and disrupting the Cd–Se bonds network. In particular, we show that the glass composition directly affects the nature of the highest occupied molecular orbitals (HOMO). According to the atomic structure, the band gap distribution and the density of states calculation, we find that there is significant reconstruction of the QD, and that the picture sometimes proposed of a “pristine QD” surrounded by glass is not realistic. The introduction of CdSe QD significantly decreased the bandgap of the glass compared to pristine glasses, and the interfacial bonds greatly contributed to the frontier orbitals without forming midgap states. We propose a new energy diagram, quite different from the traditional model, to explain the luminescence of CdSe quantum dot- doped glasses, originating from the intrinsic emission of this hybrid system {QD + glass}. These results improve our understanding of the luminescence of CdSe quantum dot-doped glasses, explaining the reason for the poor quantum efficiency and broad emission linewidth compared with their colloidal counterparts. </p> </div> </div> </div>

Compositional Dependence of CdSe Quantum Dot Formation on Silicate Host Glass Composition

2013 ◽  
Vol 96 (12) ◽  
pp. 3868-3871 ◽  
Author(s):  
Yl Kwon Lee ◽  
Yong Gyu Choi ◽  
Jong Heo ◽  
Woon Jin Chung
Keyword(s):  
Quantum Dot ◽  
Glass Composition ◽  
Compositional Dependence ◽  
Host Glass ◽  
Cdse Quantum Dot

scholarly journals Ab Initio Molecular Dynamics of CdSe Quantum-Dot-Doped Glasses

2020 ◽  
Vol 142 (8) ◽  
pp. 3905-3912
Author(s):  
Wenke Li ◽  
Xiujian Zhao ◽  
Chao Liu ◽  
François-Xavier Coudert
Keyword(s):  
Molecular Dynamics ◽  
Quantum Dot ◽  
Ab Initio ◽  
Ab Initio Molecular Dynamics ◽  
Cdse Quantum Dot ◽  
Doped Glasses

Fabrication and characterization of BiFeO3/CdSe quantum dot based photodetector

2020 ◽  
Author(s):  
Rishibrind Kumar Upadhyay ◽  
Abhinav Pratap Singh ◽  
Deepchandra Upadhyay ◽  
Amit Kumar ◽  
Satyabrata Jit
Keyword(s):  
Quantum Dot ◽  
Cdse Quantum Dot ◽  
Fabrication And Characterization

Anisotropic Nanostructure ZnO Photoelectrodes for CdS/CdSe Quantum Dot Sensitized Solar Cells

2013 ◽  
Vol 873 ◽  
pp. 556-561
Author(s):  
Jian Jun Tian
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Quantum Dot ◽  
Chemical Bath Deposition ◽  
Cdse Quantum Dots ◽  
Silar Method ◽  
Nanorods Array ◽  
Cdse Quantum Dot ◽  
Cbd Method ◽  
Sensitized Solar Cells

CdS/CdSe quantum dots co-sensitized solar cells (QDSCs) were prepared by combining the successive ion layer absorption and reaction (SILAR) method and chemical bath deposition (CBD) method for the fabrication of CdS and CdSe quantum dots, respectively. In this work, we designed anisotropic nanostructure ZnO photoelectrodes, such as nanorods/nanosheets and nanorods array, for CdS/CdSe quantum dots co-sensitized solar cells. Our study revealed that the performance of QDSCs could be improved by modifying surface of ZnO to increase the loading of quantum dots and reduce the charge recombination.

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