Role of Nd3+ ions on the nucleation and growth of PbS quantum dots (QDs) in silicate glasses

2017 ◽  
Vol 100 (7) ◽  
pp. 2879-2884 ◽  
Author(s):  
Won Ji Park ◽  
Min Gyu Kim ◽  
Ju Eun Kim ◽  
Jing Wang ◽  
Ho Jeong Lee ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Nucleation And Growth ◽  
Silicate Glasses ◽  
Pbs Quantum Dots

Millisecond Kinetics of PbS Quantum Dots Using Droplet-based Microfluidics with On-line Absorption and Fluorescence Spectroscopy

2015 ◽  
Vol 1780 ◽  
Author(s):  
Ioannis Lignos ◽  
Stavros Stavrakis ◽  
Ardita Kilaj ◽  
Andrew deMello
Keyword(s):  
Quantum Dots ◽  
Time Frame ◽  
Quantitative Information ◽  
Nucleation And Growth ◽  
Microfluidic Platform ◽  
Novel Approach ◽  
Line Absorption ◽  
On Line ◽  
Pbs Quantum Dots ◽  
Kinetics Of

ABSTRACTWe report a novel approach for the on-line characterization of nucleation and growth kinetics of lead sulfide (PbS) quantum dots using droplet-based microfluidics. Monodisperse NIR-emitting PbS with optical bandgap between 680 to 1200 nm can be formed rapidly using two reaction schemes at different operating temperatures between 70 and 130°C and the temporal evolution of the absorption and fluorescence spectra are monitored in real-time using a microfluidic platform with an on-line absorption and fluorescence optical system. Therefore, this microfluidic platform is able to provide quantitative information on a millisecond (ms) time frame regarding the size, size distribution, concentration and emission characteristics of the generated nuclei and particles. To our knowledge, this represents the first microfluidic approach for the study of the nucleation and growth in high-temperature colloidal crystallization using in-situ absorption and photoluminescence spectroscopy.

Porous Semiconductor Films For Photo-Electrical Applications

1996 ◽  
Vol 426 ◽  
Author(s):  
R. Könenkamp ◽  
P. Hoyer
Keyword(s):  
Quantum Dots ◽  
Semiconductor Devices ◽  
Experimental Results ◽  
Semiconductor Films ◽  
Trap States ◽  
Porous Films ◽  
Nano Crystalline ◽  
Pbs Quantum Dots

AbstractWe report on the preparation and characterization of semiconductor devices based on porous nano-crystalline TiO2 films. We present experimental results on photoconduction to elucidate the role of trap states in this material. We then analyse the behavior of a SnO2/TiO2/Pt Schottkydiode and finally present spectral photoresponse data obtained on a hetero-junction between TiO2 films and PbS quantum dots. We find that the porous films hold some promise for electronic applications, in which fast reponse times are not required.

scholarly journals Role of interband and photoinduced absorption in the nonlinear refraction and absorption of resonantly excited PbS quantum dots around 1550 nm

2012 ◽  
Vol 85 (11) ◽  
Author(s):  
Abdoulghafar Omari ◽  
Iwan Moreels ◽  
Francesco Masia ◽  
Wolfgang Langbein ◽  
Paola Borri ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Nonlinear Refraction ◽  
Photoinduced Absorption ◽  
Pbs Quantum Dots

Optical Properties of Si Quantum Dots in Silica via an Implantation Mask

2009 ◽  
Vol 1208 ◽  
Author(s):  
Eric G. Barbagiovanni ◽  
Lyudmila V Goncharova ◽  
Peter J Simpson ◽  
Nathan Armstrong
Keyword(s):  
Quantum Dots ◽  
Peak Shift ◽  
Nucleation And Growth ◽  
Quantum Field ◽  
Photoluminescence Spectra ◽  
Silica Microspheres ◽  
Transmission Electron ◽  
Si Quantum Dots ◽  
Field Theoretical Model

AbstractWe studied photoluminescent properties and luminescent decay dynamics in Si quantum dots (QDs) produced by Si implantation in SiO2, and their modification by the application of an implantation mask. Silicon quantum dots were prepared by ion implantation, followed by high temperature annealing leading to nanocrystal nucleation and growth. The mask was prepared by spin-coating silica microspheres to achieve laterally-selective implantation, to control QD size and separation. Transmission electron microscopy (TEM) images were obtained to verify the diameter of the quantum dots. We observe a noticeable peak shift and narrowing in the photoluminescence spectra with the application of the implantation mask. Observed maxima in the photoluminescence spectra are compared with a quantum field theoretical model using an infinite confining 1D potential for Si quantum dots. We comment on the role of excitation transfer by observing a change in the dispersion exponent of the luminescent decay dynamics due to the mask.

Synergistic Effect Between Halide Perovskites and PbS Quantum Dots

2020 ◽  
Author(s):  
Iván Mora-Seró ◽  
Sofia Masi ◽  
David Macias-Pinilla ◽  
Carlos Echeverría-Arrondo ◽  
Juan Ignacio Climente
Keyword(s):  
Quantum Dots ◽  
Synergistic Effect ◽  
Halide Perovskites ◽  
Pbs Quantum Dots
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