Photoluminescence properties of Cu-doped CdTeSe alloyed quantum dots versus laser excitation power and temperature

2020 ◽  
Vol 218 ◽  
pp. 116838 ◽  
Author(s):  
N.T. Hien ◽  
P.M. Tan ◽  
H.T. Van ◽  
V.T.K. Lien ◽  
P.V. Do ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Laser Excitation ◽  
Excitation Power ◽  
Photoluminescence Properties

scholarly journals Crystalline borophene quantum dots and their derivative boron nanospheres

2021 ◽  
Author(s):  
Huiqi Wang ◽  
Duo An ◽  
Mei Wang ◽  
Liwen Sun ◽  
Ying Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Hydrazine Hydrate ◽  
High Power ◽  
Photoluminescence Properties ◽  
Chemical Exfoliation ◽  
One Step

Crystalline borophene quantum dots with two-photo fluorescence and their derivative boron nanospheres with hydrazine hydrate-dependent photoluminescence properties were prepared by efficient high-power sonication method combined with chemical exfoliation and one-step...

scholarly journals Down-Shifting in the YAM: Ce3+ + Yb3+ System for Solar Cells

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2753
Author(s):  
Bartosz Fetliński ◽  
Sebastian Turczyński ◽  
Michał Malinowski ◽  
Paweł Szczepański
Keyword(s):  
Energy Transfer ◽  
Emission Intensity ◽  
Potential Application ◽  
Single Photon ◽  
Solar Spectrum ◽  
Excitation Power ◽  
Photovoltaic Devices ◽  
Photoluminescence Properties ◽  
System A ◽  
Down Conversion

In this work, we investigate Ce3+ to Yb3+ energy transfer in Y4Al2O9 (YAM) for potential application in solar spectrum down-converting layers for photovoltaic devices. Photoluminescence properties set, of 10 samples, of the YAM host activated with Ce3+ and Yb3+ with varying concentrations are presented, and the Ce3+ to Yb3+ energy transfer is proven. Measurement of highly non-exponential luminescence decays of Ce3+ 5d band allowed for the calculation of maximal theoretical quantum efficiency, of the expected down-conversion process, equal to 123%. Measurements of Yb3+ emission intensity, in the function of excitation power, confirmed the predominantly single-photon downshifting character of Ce3+ to Yb3+ energy transfer. Favorable location of the Ce3+ 5d bands in YAM makes this system a great candidate for down-converting, and down-shifting, luminescent layers for photovoltaics.

Tuning the structural, optical and photoluminescence properties of hybrid perovskite quantum dots by A-site doping

2020 ◽  
Vol 18 ◽  
pp. 100488 ◽  
Author(s):  
Juan Jesús Gallardo ◽  
Eduardo Blanco ◽  
Antonio Sánchez-Coronilla ◽  
José Carlos Pinero ◽  
Javier Navas
Keyword(s):  
Quantum Dots ◽  
Photoluminescence Properties ◽  
Hybrid Perovskite ◽  
Perovskite Quantum Dots ◽  
A Site

The Emission Property of Phosphors LEDs Based on ZnCuInS/ZnSe/ZnS Quantum Dots

2014 ◽  
Vol 989-994 ◽  
pp. 623-625
Author(s):  
Ke Bi ◽  
Wen Yan Liu ◽  
Tian Yue Xu ◽  
Tie Qiang Zhang ◽  
Yu Zhang
Keyword(s):  
Quantum Dots ◽  
Photoluminescence Spectrum ◽  
Stokes Shift ◽  
Core Shell ◽  
Photoluminescence Properties ◽  
Red Emission ◽  
Light Emitting ◽  
Quantum Size ◽  
Gan Led ◽  
Photoluminescence Peak

.In this research, ZnCuInS/ZnSe/ZnS quantum dots (QDs) have been studied as an excellent red emitting source for blue GaN LED because of its non-toxic deep red emmission, and large Stokes shift properties. In the paper ZnCuInS/ZnSe/ZnS core/shell quantum dots were prepared with the particle size of 4.5nm. According to the measurement of photoluminescence spectrum emitted by ZnCuInS/ZnSe/ZnS core/shell quantum dots, the emitting peak of 700 nm and the full was achieved as red emitter.It was found that absorption edge and photoluminescence peak shifted to shorter wavelength with decreasing the nanocrystal size due to quantum size effect.Meanwhile, we were prepared ZnCuInS/ZnSe/ZnS core/shell quantum dot light emitting diodes and their photoluminescence properties were studied. After the suitable bias was applied on the films, increasing the ZnCuInS/ZnSe/ZnS QDs concentration in the blue GaN chips, red emission increased with decreasing LED’s blue light.

Photoluminescence of Ca4Ga2S7:Eu2+ in wide excitation intensity and temperature range

2021 ◽  
pp. 2150392
Author(s):  
B. D. Urmanov ◽  
M. S. Leanenia ◽  
G. P. Yablonskii ◽  
O. B. Taghiyev ◽  
K. O. Taghiyev ◽  
...  
Keyword(s):  
Room Temperature ◽  
Laser Excitation ◽  
Excitation Intensity ◽  
Temperature Measurements ◽  
Constant Time ◽  
Photoluminescence Properties ◽  
Temperature Range ◽  
Chalcogenide Semiconductors ◽  
Time Frames

Photoluminescence properties of [Formula: see text] chalcogenide semiconductors have been studied under the impulse laser excitation in the range of 10–105 W/cm2 at room temperature. This study has shown that as a result of excitation, photoluminescence of [Formula: see text] is characterized by the emission in the interval of 450–575 nm with significant domination in the spectra line at 660 nm. Photoluminescence of [Formula: see text] quenches at wavelengths of 560 nm and 660 nm with constant time frames 258 ns and 326 ns, respectively. Moreover, the temperature measurements of photoluminescence were performed on the samples in the temperature range of 10–300 K.

All-inorganic perovskite quantum dots-based electrospun polyacrylonitrile fiber for ultra-sensitive trace-recording

2021 ◽  
Author(s):  
Yanyan Li ◽  
Lifan Shen ◽  
E.Y.B. Pun ◽  
Hai Lin
Keyword(s):  
Quantum Dots ◽  
Laser Excitation ◽  
Green Emission ◽  
Polyacrylonitrile Fiber ◽  
Enhanced Fluorescence ◽  
Electrospinning Technique ◽  
Band Emission ◽  
Pan Fiber ◽  
Perovskite Quantum Dots ◽  
Biological Protection

Abstract All-inorganic dual-phase CsPbBr3-Cs4PbBr6 quantum dots (CPB QDs)-based polyacrylonitrile (PAN) fiber synthesized by supersaturated recrystallization and electrospinning technique possesses characteristics of homogeneous morphology, high crystallinity and solution sensitivity. Under 365 nm laser excitation, CPB@PAN fiber exhibits surprising trace-recording capability attributing to the splash-enhanced fluorescence (FL) performance with a narrow-band emission at 477-515 nm. In the process of ethanol-anhydrous (EA) and water splashing, the CPB@PAN fiber presents conspicuous blue and green emission when contacting with EA and water, and maintains intense blue and green FL for more than 4 months. These experimental and theoretical findings provide a facile technology for the development of biological protection display, biotic detection and moisture-proof forewarning based on the trace-recording performance of CPB@PAN fiber.

scholarly journals Photoluminescence properties of hybrid perovskites in solar cells with TiO2 and Mg0.2Zn0.8O electron transport layers

2020 ◽  
Vol 60 (3) ◽  
Author(s):  
Aurimas Čerškus ◽  
Steponas Ašmontas ◽  
Kazimieras Petrauskas ◽  
Algirdas Sužiedėlis ◽  
Jonas Gradauskas ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Electron Transport ◽  
Continuous Wave ◽  
Excitation Power ◽  
Photoluminescence Properties ◽  
Magnesium Zinc Oxide ◽  
Perovskite Layer ◽  
Temporal Decay ◽  
Carrier Recombination ◽  
Hybrid Perovskite

This paper presents a study of the photoluminescence properties of hybrid perovskite films deposited on titanium and magnesium zinc oxide films, as electron transport layers, using the spin-coating technique. The subject of the investigation was continuous wave photoluminescence versus temperature, excitation power and transient photoluminescence. Moreover, the paper discusses possible carrier recombination mechanisms. Complex temporal decay was approximated through the use of several models, but only the four-exponent model and the model using the sum of two hyperbolic functions provided a good agreement with the experimental data. The first attempt to replace titanium dioxide with magnesium zinc oxide in conjunction with the perovskite layer showed improved optical properties such as a weaker non-radiative recombination process and a longer decay time constant.

Pyramid-Shaped Si/Ge Superlattice Quantum Dots with Enhanced Photoluminescence Properties

2006 ◽  
Vol 18 (3) ◽  
pp. 367-370 ◽  
Author(s):  
H.-C. Chen ◽  
C.-W. Wang ◽  
S.-W. Lee ◽  
L.-J. Chen
Keyword(s):  
Quantum Dots ◽  
Photoluminescence Properties ◽  
Enhanced Photoluminescence
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