Glycol ether additives control the size of PbS nanocrystals at reaction completion

2020 ◽  
Vol 8 (35) ◽  
pp. 12068-12074
Author(s):  
Philippe B. Green ◽  
Zhibo Wang ◽  
Philip Sohn ◽  
Christian J. Imperiale ◽  
Oleksandr Voznyy ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Glycol Ether ◽  
Nanocrystal Size ◽  
Colloidal Synthesis ◽  
Glycol Ethers ◽  
Pbs Nanocrystals ◽  
Reaction Completion ◽  
Pbs Quantum Dots

In the colloidal synthesis of PbS quantum dots, added glycol ethers variably suppress the formation of metastable cluster intermediates. This achieves control of nanocrystal size in reactions run to completion.

scholarly journals Stable DHLA–PEG capped PbS quantum dots: from synthesis to near-infrared biomedical imaging

2018 ◽  
Vol 6 (4) ◽  
pp. 550-555 ◽  
Author(s):  
F. Zamberlan ◽  
L. Turyanska ◽  
A. Patanè ◽  
Z. Liu ◽  
H. E. L. Williams ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Biomedical Imaging ◽  
Near Infrared ◽  
Non Invasive ◽  
Pbs Nanocrystals ◽  
Pbs Quantum Dots

Stability, biocompatibility and near-infrared photoluminescence of PbS nanocrystals capped with PEG-based ligands open up realistic prospects for non-invasive bioimaging applications.

scholarly journals Ultra-small PbS nanocrystals as sensitizers for red-to-blue triplet-fusion upconversion

2021 ◽  
Author(s):  
Christian J. Imperiale ◽  
Philippe B. Green ◽  
Minhal Hasham ◽  
Mark W. B. Wilson
Keyword(s):  
Quantum Dots ◽  
Pbs Nanocrystals ◽  
Pbs Quantum Dots

We demonstrate the use of ultra-small PbS quantum dots as endothermic sensitizers for red-to-blue triplet-fusion upconversion, achieving nanocrystal-sensitized upconversion photochemistry.

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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