scholarly journals Temperature dependence of the photoluminescence emission from thiol-capped PbS quantum dots

2007 ◽  
Vol 90 (10) ◽  
pp. 101913 ◽  
Author(s):  
L. Turyanska ◽  
A. Patanè ◽  
M. Henini ◽  
B. Hennequin ◽  
N. R. Thomas
Keyword(s):  
Quantum Dots ◽  
Temperature Dependence ◽  
Photoluminescence Emission ◽  
Pbs Quantum Dots

scholarly journals Optical Properties of PbS Quantum Dots deposited on Glass Employing a Supercritical CO2 Fluid Process

2019 ◽  
Vol 9 (21) ◽  
pp. 4567
Author(s):  
Bruno Ullrich ◽  
Joanna Wang
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Temperature Dependence ◽  
Supercritical Co2 ◽  
Cryogenic Temperatures ◽  
Supercritical Co2 Fluid ◽  
Fluid Process ◽  
Pbs Quantum Dots

We studied the temperature dependence of the emission and absorption of PbS quantum dots deposited on glass by a supercritical CO2 fluid process. The results show that the emission is ruled by different transitions than the absorption, particularly at cryogenic temperatures. We found indications that these observations can be linked to the PbS concentration used to form the films in conjunction with the capability of the supercritical CO2 method to form dense homogeneous films.

Lead Sulfide Quantum Dot Synthesis, Deposition, and Temperature Dependence Studies of the Stokes Shift

2012 ◽  
Vol 1409 ◽  
Author(s):  
Joanna S. Wang ◽  
Bruno Ullrich ◽  
Gail J. Brown
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Temperature Dependence ◽  
Thermal Energy ◽  
Lead Sulfide ◽  
Stokes Shift ◽  
Thermal Alteration ◽  
Optical Absorbance ◽  
Pbs Quantum Dots

ABSTRACTWe investigated the temperature dependence of the Stokes shift of PbS quantum dots (diameter 4.7 nm) deposited from solution on glass using a specially designed apparatus. By measuring the thermal alteration of the optical absorbance and photoluminescence in the range of 5 K – 300 K, we demonstrate that the Stokes shift shrinks from 135 meV at 5 K to 62 meV at 300 K. Extrapolation of the data presented predict an elimination temperature of the Stokes shift of about 460 K, corresponding to the thermal energy of the sum of prominent PbS phonon energies.

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

scholarly journals A method for studying pico to microsecond time-resolved core-level spectroscopy used to investigate electron dynamics in quantum dots

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Tamara Sloboda ◽  
Sebastian Svanström ◽  
Fredrik O. L. Johansson ◽  
Aneta Andruszkiewicz ◽  
Xiaoliang Zhang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electron Injection ◽  
Core Level ◽  
Pump Laser ◽  
Repetition Frequency ◽  
Specific Information ◽  
Single Experiment ◽  
Time Resolved ◽  
X Ray ◽  
Pbs Quantum Dots

AbstractTime-resolved photoelectron spectroscopy can give insights into carrier dynamics and offers the possibility of element and site-specific information through the measurements of core levels. In this paper, we demonstrate that this method can access electrons dynamics in PbS quantum dots over a wide time window spanning from pico- to microseconds in a single experiment carried out at the synchrotron facility BESSY II. The method is sensitive to small changes in core level positions. Fast measurements at low pump fluences are enabled by the use of a pump laser at a lower repetition frequency than the repetition frequency of the X-ray pulses used to probe the core level electrons: Through the use of a time-resolved spectrometer, time-dependent analysis of data from all synchrotron pulses is possible. Furthermore, by picosecond control of the pump laser arrival at the sample relative to the X-ray pulses, a time-resolution limited only by the length of the X-ray pulses is achieved. Using this method, we studied the charge dynamics in thin film samples of PbS quantum dots on n-type MgZnO substrates through time-resolved measurements of the Pb 5d core level. We found a time-resolved core level shift, which we could assign to electron injection and charge accumulation at the MgZnO/PbS quantum dots interface. This assignment was confirmed through the measurement of PbS films with different thicknesses. Our results therefore give insight into the magnitude of the photovoltage generated specifically at the MgZnO/PbS interface and into the timescale of charge transport and electron injection, as well as into the timescale of charge recombination at this interface. It is a unique feature of our method that the timescale of both these processes can be accessed in a single experiment and investigated for a specific interface.

Temperature-induced PbS quantum dots with tunable broadband wavelength grown by atomic layer deposition

2021 ◽  
Vol 546 ◽  
pp. 149086
Author(s):  
Xiangping Pan ◽  
Yanhua Dong ◽  
Ming Jia ◽  
Jianxiang Wen ◽  
Caiyun Su ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Layer Deposition ◽  
Pbs Quantum Dots

scholarly journals Colloidal PbS quantum dots for visible-to-near-infrared optical-internet-of-things

2021 ◽  
pp. 1-1
Author(s):  
Aigerim Tankimanova ◽  
Chun Hong Kang ◽  
Omar Alkhazragi ◽  
Haodong Tang ◽  
Meiwei Kong ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Internet Of Things ◽  
Near Infrared ◽  
Optical Internet ◽  
Pbs Quantum Dots
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