scholarly journals Enhanced Luminescence and Mechanistic Studies on Mn-doped Double Layered Perovskite Phosphors: Cs4Mn1−xCdxBi2Cl12

2020 ◽  
Author(s):  
Brenda Vargas ◽  
Diana T. Reyes-Castillo ◽  
Eduardo Coutino-Gonzalez ◽  
Citlali Sánchez-Aké ◽  
Carlos Ramos ◽  
...  
Keyword(s):  
Magnetic Coupling ◽  
Layered Perovskite ◽  
Great Promise ◽  
New Family ◽  
Halide Perovskites ◽  
Optoelectronic Applications ◽  
The Stability ◽  
Low Dimensional ◽  
Stability Issues ◽  
Mn Doped

Halide perovskites offer great promise for optoelectronic applications, but stability issues continue to hinder its implementation and long-term stability. The stability of all-inorganic halide perovskites and the inherent quantum confinement of low dimensional perovskites can be harnessed to synthesize materials with high PL efficiency. An example of such materials is the recently reported new family of layered double perovskites, Cs4Mn1−xCdxBi2Cl12. Herein, we report a new synthetic procedure that enhances the maximum PLQY of this family materials to up 79.5%, a 20% enhancement from previous reports and the highest reported for a Mn-doped halide perovskite. Importantly, stability tests demonstrate that these materials are very stable towards humidity, UV irradiation, and temperature. Finally, we investigated the photophysics, the effects of magnetic coupling and temperature in the PL efficiency and proposed a mechanism for the emission process. Our results highlight the potential of this family of materials and related layered all-inorganic perovskites for solid-state lighting and optoelectronic applications<p></p>

scholarly journals Enhanced Luminescence and Mechanistic Studies on Mn-doped Double Layered Perovskite Phosphors: Cs4Mn1−xCdxBi2Cl12

2020 ◽  
Author(s):  
Brenda Vargas ◽  
Diana T. Reyes-Castillo ◽  
Eduardo Coutino-Gonzalez ◽  
Citlali Sánchez-Aké ◽  
Carlos Ramos ◽  
...  
Keyword(s):  
Magnetic Coupling ◽  
Layered Perovskite ◽  
Great Promise ◽  
New Family ◽  
Halide Perovskites ◽  
Optoelectronic Applications ◽  
The Stability ◽  
Low Dimensional ◽  
Stability Issues ◽  
Mn Doped

Halide perovskites offer great promise for optoelectronic applications, but stability issues continue to hinder its implementation and long-term stability. The stability of all-inorganic halide perovskites and the inherent quantum confinement of low dimensional perovskites can be harnessed to synthesize materials with high PL efficiency. An example of such materials is the recently reported new family of layered double perovskites, Cs4Mn1−xCdxBi2Cl12. Herein, we report a new synthetic procedure that enhances the maximum PLQY of this family materials to up 79.5%, a 20% enhancement from previous reports and the highest reported for a Mn-doped halide perovskite. Importantly, stability tests demonstrate that these materials are very stable towards humidity, UV irradiation, and temperature. Finally, we investigated the photophysics, the effects of magnetic coupling and temperature in the PL efficiency and proposed a mechanism for the emission process. Our results highlight the potential of this family of materials and related layered all-inorganic perovskites for solid-state lighting and optoelectronic applications<p></p>

scholarly journals Tailoring capping-layer composition for improved stability of mixed-halide perovskites

2022 ◽  
Author(s):  
Noor Titan Putri Hartono ◽  
Marie-Hélène Tremblay ◽  
Sarah Wieghold ◽  
Benjia Dou ◽  
Janak Thapa ◽  
...  
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Capping Layer ◽  
Improved Stability ◽  
Halide Perovskites ◽  
The Stability ◽  
Low Dimensional ◽  
Layer Composition

Incorporating a low dimensional (LD) perovskite capping layer on top of perovskite absorber, improves the stability of perovskite solar cells (PSCs). However, in the case of mixed-halide perovskites, which can...

scholarly journals Aurivillius Halide Perovskite: A New Family of Two-Dimensional Materials for Optoelectronic Applications

2019 ◽  
Author(s):  
Shuai Zhao ◽  
Chunfeng Lan ◽  
Huanhuan Li ◽  
Chu Zhang ◽  
Tingli Ma
Keyword(s):  
Electronic Properties ◽  
Density Functional ◽  
Single Layer ◽  
Functional Theory ◽  
New Family ◽  
Theoretical Support ◽  
Two Dimensional Materials ◽  
Optoelectronic Applications ◽  
The Stability ◽  
Layered Perovskites

Layered perovskites have attracted considerable attention in optoelectronic applications due to their excellent electronic properties and stability. In this work, the quasi-2D aurivillius halide perovskites are investigated using density functional theory. The single-layer aurivillius perovskite Ba2PbI6 is predicted to have a direct bandgap of 1.89 eV, which is close to that of the Ruddlesden–Popper perovskite Cs2PbI4. The electronic structures near the Fermi level are mainly governed by the [PbX6] octahedra, which leads to similar electronic properties to that of Cs2PbI4. Decomposition energies reveal that these aurivillius perovskites exhibit thermal instability. Increasing the number of [PbX6] octahedra layer can enhance the stability and reduce the bandgap. Bi- and In-based aurivillius perovskites are also calculated to evaluate the Pb-free alternatives. These calculations can serve as a theoretical support in exploring novel layered perovskites.<br>

scholarly journals Aurivillius Halide Perovskite: A New Family of Two-Dimensional Materials for Optoelectronic Applications

2019 ◽  
Author(s):  
Shuai Zhao ◽  
Chunfeng Lan ◽  
Huanhuan Li ◽  
Chu Zhang ◽  
Tingli Ma
Keyword(s):  
Electronic Properties ◽  
Density Functional ◽  
Single Layer ◽  
Functional Theory ◽  
New Family ◽  
Theoretical Support ◽  
Two Dimensional Materials ◽  
Optoelectronic Applications ◽  
The Stability ◽  
Layered Perovskites

Layered perovskites have attracted considerable attention in optoelectronic applications due to their excellent electronic properties and stability. In this work, the quasi-2D aurivillius halide perovskites are investigated using density functional theory. The single-layer aurivillius perovskite Ba2PbI6 is predicted to have a direct bandgap of 1.89 eV, which is close to that of the Ruddlesden–Popper perovskite Cs2PbI4. The electronic structures near the Fermi level are mainly governed by the [PbX6] octahedra, which leads to similar electronic properties to that of Cs2PbI4. Decomposition energies reveal that these aurivillius perovskites exhibit thermal instability. Increasing the number of [PbX6] octahedra layer can enhance the stability and reduce the bandgap. Bi- and In-based aurivillius perovskites are also calculated to evaluate the Pb-free alternatives. These calculations can serve as a theoretical support in exploring novel layered perovskites.<br>

scholarly journals Low-Dimensional Halide Perovskites and Their Advanced Optoelectronic Applications

2017 ◽  
Vol 9 (3) ◽  
Author(s):  
Jian Zhang ◽  
Xiaokun Yang ◽  
Hui Deng ◽  
Keke Qiao ◽  
Umar Farooq ◽  
...  
Keyword(s):  
Halide Perovskites ◽  
Optoelectronic Applications ◽  
Low Dimensional

Lead-free low-dimensional tin halide perovskites with functional organic spacers: breaking the charge-transport bottleneck

2019 ◽  
Vol 7 (28) ◽  
pp. 16742-16747 ◽  
Author(s):  
Ming-Gang Ju ◽  
Jun Dai ◽  
Liang Ma ◽  
Yuanyuan Zhou ◽  
Wanzhen Liang ◽  
...  
Keyword(s):  
Charge Transport ◽  
Electronic Structures ◽  
Band Alignment ◽  
Lead Free ◽  
Type Ii ◽  
Organic Species ◽  
New Family ◽  
Halide Perovskites ◽  
Low Dimensional

A new family of 2D OIHPs that may potentially break the charge-transport ‘bottleneck’ are designed by introducing π-conjugation organic species as the spacers. Their electronic structures are predicted to exhibit type-II band alignment.

Progress and Perspective in Low-Dimensional Metal Halide Perovskites for Optoelectronic Applications

Solar RRL ◽  
2018 ◽  
Vol 2 (3) ◽  
pp. 1700186 ◽  
Author(s):  
Peng Chen ◽  
Yang Bai ◽  
Miaoqiang Lyu ◽  
Jung-Ho Yun ◽  
Mengmeng Hao ◽  
...  
Keyword(s):  
Metal Halide ◽  
Halide Perovskites ◽  
Optoelectronic Applications ◽  
Low Dimensional

Determining the Norton’s Equivalent Model of Distribution System with Distributed Generation (DG) for Stability Analysis

2019 ◽  
Vol 12 (2) ◽  
pp. 190-198
Author(s):  
Sunny Katyara ◽  
Lukasz Staszewski ◽  
Faheem Akhtar Chachar
Keyword(s):  
Distributed Generation ◽  
Normal Condition ◽  
Distribution System ◽  
Distribution Networks ◽  
Equivalent Model ◽  
Stability Factor ◽  
Matlab Simulation ◽  
The Stability ◽  
Stability Issues

Background: Since the distribution networks are passive until Distributed Generation (DG) is not being installed into them, the stability issues occur in the distribution system after the integration of DG. Methods: In order to assure the simplicity during the calculations, many approximations have been proposed for finding the system’s parameters i.e. Voltage, active and reactive powers and load angle, more efficiently and accurately. This research presents an algorithm for finding the Norton’s equivalent model of distribution system with DG, considering from receiving end. Norton’s model of distribution system can be determined either from its complete configuration or through an algorithm using system’s voltage and current profiles. The algorithm involves the determination of derivative of apparent power against the current (dS/dIL) of the system. Results: This work also verifies the accuracy of proposed algorithm according to the relative variations in the phase angle of system’s impedance. This research also considers the varying states of distribution system due to switching in and out of DG and therefore Norton’s model needs to be updated accordingly. Conclusion: The efficacy of the proposed algorithm is verified through MATLAB simulation results under two scenarios, (i) normal condition and (ii) faulty condition. During normal condition, the stability factor near to 1 and change in dS/dIL was near to 0 while during fault condition, the stability factor was higher than 1 and the value of dS/dIL was away from 0.

scholarly journals Gum Tragacanth (GT): A Versatile Biocompatible Material beyond Borders

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1510 ◽  
Author(s):  
Mohammad Ehsan Taghavizadeh Yazdi ◽  
Simin Nazarnezhad ◽  
Seyed Hadi Mousavi ◽  
Mohammad Sadegh Amiri ◽  
Majid Darroudi ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Food Packaging ◽  
Three Dimensional ◽  
Great Promise ◽  
Anionic Polymer ◽  
Gum Tragacanth ◽  
New Horizons ◽  
Tissue Healing ◽  
The Stability ◽  
Therapeutic Substance

The use of naturally occurring materials in biomedicine has been increasingly attracting the researchers’ interest and, in this regard, gum tragacanth (GT) is recently showing great promise as a therapeutic substance in tissue engineering and regenerative medicine. As a polysaccharide, GT can be easily extracted from the stems and branches of various species of Astragalus. This anionic polymer is known to be a biodegradable, non-allergenic, non-toxic, and non-carcinogenic material. The stability against microbial, heat and acid degradation has made GT an attractive material not only in industrial settings (e.g., food packaging) but also in biomedical approaches (e.g., drug delivery). Over time, GT has been shown to be a useful reagent in the formation and stabilization of metal nanoparticles in the context of green chemistry. With the advent of tissue engineering, GT has also been utilized for the fabrication of three-dimensional (3D) scaffolds applied for both hard and soft tissue healing strategies. However, more research is needed for defining GT applicability in the future of biomedical engineering. On this object, the present review aims to provide a state-of-the-art overview of GT in biomedicine and tries to open new horizons in the field based on its inherent characteristics.

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