scholarly journals A Self-Powered, Sub-nanosecond-Response Solution-Processed Hybrid Perovskite Photodetector for Time-Resolved Photoluminescence-Lifetime Detection

2016 ◽  
Vol 28 (48) ◽  
pp. 10794-10800 ◽  
Author(s):  
Liang Shen ◽  
Yanjun Fang ◽  
Dong Wang ◽  
Yang Bai ◽  
Yehao Deng ◽  
...  
Keyword(s):  
Solution Processed ◽  
Time Resolved ◽  
Hybrid Perovskite ◽  
Photoluminescence Lifetime ◽  
Self Powered ◽  
Time Resolved Photoluminescence

scholarly journals Фотолюминесценция с временным разрешением наноструктур InGaAs различной квантовой размерности

2019 ◽  
Vol 53 (11) ◽  
pp. 1520
Author(s):  
А.М. Надточий ◽  
С.А. Минтаиров ◽  
Н.А. Калюжный ◽  
М.В. Максимов ◽  
Д.А. Санников ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Well ◽  
Single Photon ◽  
Photon Counting ◽  
Dimensional Structure ◽  
Time Resolved ◽  
Single Photon Counting ◽  
Gaas Substrates ◽  
Photoluminescence Lifetime ◽  
Time Resolved Photoluminescence

By using time-correlated single-photon counting time-resolved photoluminescence of quantum-sized heterostructures of different dimensionality was investigated. InGaAs quantum dots, quantum well, and transitionally-dimensional structure — quantum well-dots were grown on GaAs substrates. It was observed, that photoluminescence decay strongly depends on structure dimensionality resulting in decay value of 6,7, and more than 20 ns for quantum dots, well-dots and well, respectively. As we believe localization centers in heterostructures may be responsible for such shortening of photoluminescence lifetime.

Exploring the Potential of Time-Resolved Photoluminescence Spectroscopy for the Detection of Plastics

2020 ◽  
Vol 74 (9) ◽  
pp. 1161-1166
Author(s):  
Sebastian Gies ◽  
Eva-Marie Schömann ◽  
Julia Anna Prume ◽  
Martin Koch
Keyword(s):  
Raman Spectroscopy ◽  
Ir Spectroscopy ◽  
Terrestrial Ecosystems ◽  
Photoluminescence Spectroscopy ◽  
Time Resolved ◽  
Plastic Materials ◽  
Photoluminescence Lifetime ◽  
Ft Ir ◽  
Time Resolved Photoluminescence ◽  
Ft Ir Spectroscopy

Accurate data on microplastic occurrence in aquatic and terrestrial ecosystems are a basic requirement for microplastic risk assessment and management. Existing analysis techniques like Raman spectroscopy and Fourier transform infrared (FT-IR) spectroscopy imaging are still time-consuming and depend on laborious sample preparation. Therefore, we investigate the potential of time-resolved photoluminescence spectroscopy as an alternative technique to identify plastic materials, and, for the first time determine the photoluminescence lifetime of a series of polymers and several non-plastic samples typically found in a marine environment. The obtained photoluminescence lifetimes can be used to distinguish between plastic and natural materials. Furthermore, they allow us to identify distinct types of plastics. Therefore, the described approach has the potential to identify materials either as a stand-alone technique or for pre-characterization of sample materials for otherwise time-consuming analytical methods such as Raman spectroscopy or FT-IR spectroscopy.

Time-resolved photoluminescence lifetime measurements of the Γ5 and Γ6 free excitons in ZnO

2000 ◽  
Vol 88 (4) ◽  
pp. 2152-2153 ◽  
Author(s):  
D. C. Reynolds ◽  
D. C. Look ◽  
B. Jogai ◽  
J. E. Hoelscher ◽  
R. E. Sherriff ◽  
...  
Keyword(s):  
Lifetime Measurements ◽  
Time Resolved ◽  
Photoluminescence Lifetime ◽  
Time Resolved Photoluminescence

scholarly journals Enhancement of Photoluminescence Lifetime of ZnO Nanorods Making Use of Thiourea

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Erdal Sönmez ◽  
Kadem Meral
Keyword(s):  
Spray Pyrolysis Technique ◽  
Zno Nanorods ◽  
Optical Quality ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Time Resolved ◽  
Structural Improvement ◽  
Exciton Lifetime ◽  
Photoluminescence Lifetime ◽  
Time Resolved Photoluminescence

We have investigated correlation of photoluminescence lifetime between zinc oxide (ZnO) nanorods and thiourea-doped ZnO nanorods (tu: CH4N2S). Aqueous solutions of ZnO nanorods were deposited on glass substrate by using pneumatic spray pyrolysis technique. The as-prepared specimens were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and time-resolved photoluminescence spectroscopy (TRPL). The photoluminescence lifetime of ZnO nanorods and ZnO nanorods containing thiourea was determined as  ns and  ns , respectively. The calculated lifetime values of ZnO nanorods revealed that the presence of thiourea in ZnO nanorods resulted in increasing the exciton lifetime. In addition to the optical quality of ZnO nanorods, their exciton lifetime is comparable to the longest lifetimes reported for ZnO nanorods. The structural improvement of ZnO nanorods, containing thiourea, was also elucidated by taking their SEM images which show the thinner and longer ZnO nanorods compared to those without thiourea.

scholarly journals Dynamics of hot carriers in plasmonic heterostructures

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Anton Yu. Bykov ◽  
Diane J. Roth ◽  
Giovanni Sartorello ◽  
Jorge U. Salmón-Gamboa ◽  
Anatoly V. Zayats
Keyword(s):  
Pt Nanoparticles ◽  
Hot Electron ◽  
Hot Carriers ◽  
Time Resolved ◽  
Nanoscale Systems ◽  
Hot Carrier ◽  
Photoluminescence Lifetime ◽  
Electron Sink ◽  
Time Resolved Photoluminescence ◽  
Dependent Behaviour

Abstract Understanding and optimising the mechanisms of generation and extraction of hot carriers in plasmonic heterostructures is important for applications in new types of photodetectors, photochemistry and photocatalysis, as well as nonlinear optics. Here, we show using transient dynamic measurements that the relaxation of the excited hot-carriers in Au/Pt hetero-nanostructures is accelerated through the transfer pathway from Au, where they are generated, to Pt nanoparticles, which act as a hot-electron sink. The influence of the environment on the dynamics was also demonstrated. The time-resolved photoluminescence measurements confirm the modified hot-electron dynamics, revealing quenching of the photoluminescence signal from Au nanoparticles in the presence of Pt and an increased photoluminescence lifetime. These observations are signatures of the improved extraction efficiency of hot-carriers by the Au/Pt heterostructures. The results give insight into the time-dependent behaviour of excited compound nanoscale systems and provide a way of controlling the relaxation mechanisms involved, with important consequences for engineering nonlinear optical response and hot-carrier-assisted photochemistry.

scholarly journals Metal-semiconductor nanoheterostructures with an AlGaN quantum well and in-situ formed surface Al nanoislands

2018 ◽  
Vol 52 (5) ◽  
pp. 515
Author(s):  
E.A. Evropeytsev ◽  
A.N. Semenov ◽  
D.V. Nechaev ◽  
V.N. Jmerik ◽  
V.Kh. Kaibyshev ◽  
...  
Keyword(s):  
Quantum Well ◽  
Maximum Density ◽  
Metal Particles ◽  
Decay Kinetics ◽  
Time Resolved ◽  
Sapphire Substrates ◽  
Photoluminescence Lifetime ◽  
Time Resolved Photoluminescence ◽  
Kinetics Of

AbstractWe report on fabrication and studies of composite heterostuctures consisting of an Al_0.55Ga_0.45N/A_l0.8Ga_0.2N quantum well and surface Al nanoislands, grown by plasma-assisted molecularbeam epitaxy on c-sapphire substrates. The influence of a substrate temperature varied between 320 and 700ºC on the size and density of the deposited Al nanoislands is evaluated. The effect of Al nanoislands on decay kinetics of the quantum well middle-ultraviolet photoluminescence has been investigated by time resolved photoluminescence. The samples with the maximum density of Al nanoislands of 10^8 cm^–2 and lateral dimensions in the range of 100–500 nm demonstrated shortening of the photoluminescence lifetime, induced by interaction of the emitting quantum well and the plasmonic metal particles.

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