Photoluminescence Enhancement Study in Bi-doped Cs2AgInCl6 Double Perovskite by Pressure and Temperature-Dependent Self-Trapped Exciton Emission

2022 ◽  
Author(s):  
Kashyap Dave ◽  
Wen-Tse Huang ◽  
Tadeusz Leśniewski ◽  
Agata Lazarowska ◽  
Dawid Jankowski ◽  
...  
Keyword(s):  
Double Perovskite ◽  
Acid Precipitation ◽  
Precipitation Method ◽  
Temperature Dependent ◽  
Exciton Emission ◽  
Photoluminescence Enhancement

Here, we are reporting a halide precursors acid precipitation method to synthesize Cs2AgIn1–xBixCl6 (x = 0, 0.02, 0.04, 0.08, 0.16, 0.32, 0.64, and 1) microcrystals. Cs2AgInCl6 and Bi derivative double...

Preparation of Amorphous Nanosilica from Philippine Waste Rice Hull via Acid Precipitation Method

2016 ◽  
Vol 864 ◽  
pp. 112-116
Author(s):  
Rinlee Butch M. Cervera ◽  
Emie A. Salamangkit-Mirasol
Keyword(s):  
Electron Microscopy ◽  
Low Cost ◽  
Agricultural Waste ◽  
Acid Precipitation ◽  
Particle Size Analysis ◽  
Precipitation Method ◽  
Rice Hull ◽  
Size Analysis ◽  
Rice Hull Ash ◽  
Transmission Electron

Rice hull or rice husk (RH) is an agricultural waste obtained from milling rice grains. Since RH has no commercial value and is difficult to use in agriculture, its volume is often reduced through open field burning which is an environmental hazard. In this study, amorphous nanosilica from Philippine waste RH was prepared via acid precipitation method. The synthesized samples were fully characterized for its microstructural properties. X-ray diffraction pattern reveals that the structure of the prepared sample is amorphous in nature while Fourier transform infrared spectrum showed the different vibration bands of the synthesized sample. Scanning electron microscopy (SEM) and particle size analysis (PSA) confirmed the presence of agglomerated silica particles. On the other hand, transmission electron microscopy (TEM) revealed an amorphous sample with grain sizes of about 5 to 20 nanometer range and has about 95 % purity according to EDS analyses. The elemental mapping also suggests that leaching of rice hull ash effectively removed the metallic impurity such as potassium element in the material. Hence, amorphous nanosilica was successfully prepared via a low-cost acid precipitation method from Philippine waste rice hull.

An ultraviolet excitation anti-counterfeiting material of Sb3+ doped Cs2ZrCl6 vacancy-ordered double perovskite

2021 ◽  
Author(s):  
Ruxin Liu ◽  
Wenjun Zhang ◽  
Guojing Li ◽  
Wenjing Liu
Keyword(s):  
Double Perovskite ◽  
The Self ◽  
Exciton Emission ◽  
Ultraviolet Excitation ◽  
P Application

Application of Sb3+ doped Cs2ZrCl6 vacant-ordered double perovskite in anti-counterfeiting. The blue and orange emissions come from the self-trapped exciton emission of the Cs2ZrCl6 matrix and the ion transitions of Sb3+, respectively.

Comparison of Three Methods for the Concentration of Poliovirus from Moroccan Shellfish

1994 ◽  
Vol 57 (11) ◽  
pp. 996-1000 ◽  
Author(s):  
NOURREDINE BOUCHRITI ◽  
SAGAR M. GOYAL ◽  
ABDELHAK El MARRAKCHI ◽  
MOHAMMED JELLAL
Keyword(s):  
Mytilus Edulis ◽  
Crassostrea Gigas ◽  
Acid Precipitation ◽  
Precipitation Method ◽  
Ruditapes Decussatus ◽  
Beef Extract ◽  
Dry Milk ◽  
Virus Recovery

Three methods were evaluated for the concentration of poliovirus from artificially contaminated oysters (Crassostrea gigas), mussels (Mytilus edulis) and carpet-shell clams (Ruditapes decussatus) grown in Morocco. The methods tested were: an adsorption-elution-precipitation method, a beef extract elution acid-precipitation method, and a non-fat dry milk elution acid-precipitation method. For all shellfish species tested, the adsorption-elution-precipitation method yielded the lowest average virus recovery (27%), whereas the two elution-precipitation methods yielded average virus recoveries of 42% each. The beef extract elution acid-precipitation method yielded the highest virus recovery with clams (53%), whereas non-fat dry milk elution acid-precipitation was advantageous for mussels providing average virus recovery of 47%. For oysters, none of the tested methods gave satisfactory virus recovery. These results point towards the need for the development of better method(s) for the concentration of viruses from Moroccan oysters, while for mussels and clams, the elution-acid precipitation methods may be satisfactory.

Temperature-dependent ultraviolet photoluminescence in hierarchical Zn, ZnO and ZnO/Zn nanostructures

Nanoscale ◽  
2019 ◽  
Vol 11 (28) ◽  
pp. 13385-13396 ◽  
Author(s):  
Han-Sheng Chou ◽  
Kai-Di Yang ◽  
Sheng-Hong Xiao ◽  
Ranjit A. Patil ◽  
Chien-Chih Lai ◽  
...  
Keyword(s):  
Thermal Quenching ◽  
Two Dimensional ◽  
Zno Nanostructures ◽  
Temperature Dependent ◽  
Photoluminescence Enhancement

The temperature-dependent effects on the ultraviolet photoluminescence enhancement, blueshift, thermal quenching of the two-dimensional Zn nanosheets, 2D-hierarchical ZnO nanostructures, and 2D-hierarchical ZnO/Zn nanostructures are presented.

scholarly journals Photoluminescence Characteristics of Sn2+ and Ce3+-Doped Cs2SnCl6 Double-Perovskite Crystals

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1501 ◽  
Author(s):  
Hongdan Zhang ◽  
Ludan Zhu ◽  
Jun Cheng ◽  
Long Chen ◽  
Chuanqi Liu ◽  
...  
Keyword(s):  
Decay Curve ◽  
Double Perovskite ◽  
Fluorescence Decay ◽  
Precipitation Method ◽  
Phase Precipitation ◽  
Fluorescence Decay Curve ◽  
Low Toxicity ◽  
Halide Perovskites ◽  
Lead Halide ◽  
Poor Stability

In recent years, all-inorganic lead-halide perovskites have received extensive attention due to their many advantages, but their poor stability and high toxicity are two major problems. In this paper, a low toxicity and stable Cs2SnCl6 double perovskite crystals were prepared by aqueous phase precipitation method using SnCl2 as precursor. By the XRD, ICP-AES, XPS, photoluminescence and absorption spectra, the fluorescence decay curve, the structure and photoluminescence characteristics of Ce3+-doped and undoped samples have been investigated in detail. The results show that the photoluminescence originates from defects. [ S n S n 4 + 2 + +VCl] defect complex in the crystal is formed by Sn2+ substituting Sn4+. The number of defects formed by Sn2+ in the crystal decreases with Ce3+ content increases. Within a certain number of defects, the crystal luminescence is enhanced with the number of [ S n S n 4 + 2 + +VCl] decreased. When Ce3+ is incorporated into the crystals, the defects of [ C e 3 + S n 4 + +VCl] and [ S n S n 4 + 2 + +VCl] were formed and the crystal show the strongest emission. This provides a route to enhance the photoluminescence of Cs2SnCl6 double perovskite crystals.

scholarly journals Effects of Methane Fermentation on Spectral Properties of Fulvic Acid Extracted from Peat through Liquid Acid Precipitation

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Li-Tong Ma ◽  
Ya-Nan Lu ◽  
Ya-Xiong Wang
Keyword(s):  
Fulvic Acid ◽  
Spectral Properties ◽  
Fermentation Process ◽  
Acid Precipitation ◽  
Alkali Solution ◽  
Precipitation Method ◽  
Methane Fermentation ◽  
Liquid Acid ◽  
Vis Spectroscopy ◽  
Benzene Rings

The effects of acid precipitation with different liquid acids on spectral properties of fulvic acid extracted from peat was studied to select the most appropriate liquid acid for the acid precipitation step of the alkali solution acid precipitation method, and the new process mechanism of peat utilization by coupling methane fermentation and extraction of fulvic acid was analyzed. The alkali solution acid precipitation method was adopted to extract fulvic acid from the methane-fermented group and methane-unfermented group. Different liquid acids were used to conduct acid precipitation during the extraction. And then, the characterizations of fulvic acid samples were conducted through Fourier infrared spectroscopy, UV-Vis spectroscopy, and fluorescence spectroscopy. The yield and content of fulvic acid decreased significantly after methane fermentation. During the methane fermentation process, some fulvic acid was consumed and utilized by microorganisms to promote the methane fermentation process, resulting both in the decrease of methyl, hydroxyl, and ether bonds and in the increase of methylene, carbonyl, conjugated double bond, benzene rings, and other groups. The E4/E6 ratio shows that the E4/E6 ratio of fulvic acid was decreased after methane fermentation, and the fermentation consumed the functional group with simpler structure such as aliphatic chain hydrocarbon of fulvic acid while the structure with a higher degree of aromatization and conjugate cannot be consumed. When conducting acid precipitation with different liquid acids, the yield of fulvic acid was the highest through acid precipitation with phosphoric acid. The fulvic acid obtained through acid precipitation with nitric acid has a higher content, more benzene rings, and the highest degree of aromatization.

scholarly journals Magnetizing lead-free halide double perovskites

2020 ◽  
Vol 6 (45) ◽  
pp. eabb5381
Author(s):  
Weihua Ning ◽  
Jinke Bao ◽  
Yuttapoom Puttisong ◽  
Fabrizo Moro ◽  
Libor Kobera ◽  
...  
Keyword(s):  
High Speed ◽  
Double Perovskite ◽  
Lead Free ◽  
Great Success ◽  
Double Perovskites ◽  
Temperature Dependent ◽  
Magnetic Elements ◽  
Halide Perovskites ◽  
New Generation ◽  
Further Development

Spintronics holds great potential for next-generation high-speed and low–power consumption information technology. Recently, lead halide perovskites (LHPs), which have gained great success in optoelectronics, also show interesting magnetic properties. However, the spin-related properties in LHPs originate from the spin-orbit coupling of Pb, limiting further development of these materials in spintronics. Here, we demonstrate a new generation of halide perovskites, by alloying magnetic elements into optoelectronic double perovskites, which provide rich chemical and structural diversities to host different magnetic elements. In our iron-alloyed double perovskite, Cs2Ag(Bi:Fe)Br6, Fe3+ replaces Bi3+ and forms FeBr6 clusters that homogenously distribute throughout the double perovskite crystals. We observe a strong temperature-dependent magnetic response at temperatures below 30 K, which is tentatively attributed to a weak ferromagnetic or antiferromagnetic response from localized regions. We anticipate that this work will stimulate future efforts in exploring this simple yet efficient approach to develop new spintronic materials based on lead-free double perovskites.

Synthesis and Dispersity of YBCO Powder Produced by Oxalic Acid Precipitation Method

2015 ◽  
Vol 645-646 ◽  
pp. 145-150 ◽  
Author(s):  
Ai Qin Wang ◽  
Hui Hui Han ◽  
Min Li ◽  
Jing Pei Xie ◽  
Qing Jie Wu ◽  
...  
Keyword(s):  
Grain Size ◽  
Oxalic Acid ◽  
Technological Parameter ◽  
Oxalic Acid Solution ◽  
Acid Precipitation ◽  
Precipitation Method ◽  
Test Results ◽  
Ph Values ◽  
Mean Grain Size ◽  
The Mean

The YBCO powder was prepared by oxalic acid precipitation method and consequent annealing. The correlation between pH values of oxalic acid solution and the precipitation percentage of precursors were analysed based on thermodynamics analysis. The differential scanning calorimetryanalysis (DSC) was used to confirm the synthetic technological parameter. The phases of powder in each process were investigated by XRD. The microstructures of each powder were tested by SEM and TEM. The mean grain size was calculated by the scherrer’s equation. The test results indicated that the YBCO powder with high purity, less impurities, smaller particle, but severe agglomeration, was Y123 when annealing at 900°C. However, adding dispersants could effectively solve the severe agglomeration. The size of YBCO particles was nanosized and coincided with the calculation.

Temperature dependent band gap and homogeneous line broadening of the exciton emission in ZnO

2006 ◽  
Vol 3 (4) ◽  
pp. 976-979 ◽  
Author(s):  
R. Hauschild ◽  
H. Priller ◽  
M. Decker ◽  
J. Brückner ◽  
H. Kalt ◽  
...  
Keyword(s):  
Band Gap ◽  
Line Broadening ◽  
Temperature Dependent ◽  
Exciton Emission
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