Low-Dimensional Phase Suppression and Defect Passivation of Quasi-2D Perovskites for Efficient Electroluminescence and Low-Threshold Amplified Spontaneous Emission

Nanoscale ◽  
2021 ◽  
Author(s):  
Guangrong Jin ◽  
Tanghao Liu ◽  
Yuanzhao Li ◽  
Jiadong Zhou ◽  
Dengliang Zhang ◽  
...  
Keyword(s):  
Binding Energy ◽  
Spontaneous Emission ◽  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Light Emitting ◽  
Large Exciton Binding Energy ◽  
Defect Passivation ◽  
Low Threshold ◽  
Halide Perovskites ◽  
Low Dimensional

Quasi-2D metal halide perovskites are promising candidates for light-emitting application owing to their large exciton binding energy and strong quantum confinement effect. Usually, quasi-2D perovskites are composed of multiple phases...

The structure, and electronic and magnetic properties of MX (M=GA, IN; X=S, SE, TE) nanoribbons

2020 ◽  
Vol 34 (18) ◽  
pp. 2050168
Author(s):  
Fei Feng ◽  
Fengdong Lv ◽  
Gongping Zheng ◽  
Guangtao Wang
Keyword(s):  
Magnetic Properties ◽  
Quantum Confinement ◽  
Density Functional ◽  
Quantum Confinement Effect ◽  
Ring Structure ◽  
Functional Theory ◽  
Electronic And Magnetic Properties ◽  
Semiconductor Behavior ◽  
Low Dimensional ◽  
Edge Side

We used the first principle of density functional theory to perform detailed calculations regarding the structure, and the electronic and magnetic properties of MX (M[Formula: see text]=[Formula: see text]Ga, In; X[Formula: see text]=[Formula: see text]S, Se, Te) nanoribbons. The armchair nanoribbons (ARNs) are nonmagnetic semiconductors, which have even or odd oscillations of bandgaps. All small-sized zigzag nanoribbons (ZRNs) were found to break the six-membered ring structure and move to the center, thereby exhibiting nonmagnetic semiconductor behavior owing to the quantum confinement effect. However, among the large ZRNs, which are all metals, MTe ZRNs are nonmagnetic; this differs from the case of graphene, MoS2 and Ti2CO2 nanoribbons. MX (M[Formula: see text]=[Formula: see text]Ga, In; X[Formula: see text]=[Formula: see text]S, Se) ZRNs exhibited ferromagnetism owing to the presence of the unpaired electrons on the metal-edge side and the magnetic moment of each pair of molecules, which was controlled by the size of the nanoribbons. The results provided a theoretical reference that can be used in the future to produce MX materials for application in low-dimensional semiconductor devices, spin electron transport devices and new magnetoresistance devices.

Nanocrystals of Metal Halide Perovskites and Their Analogues as Scintillators for X-ray detection

Nano Futures ◽  
2021 ◽  
Author(s):  
Huiwen Chen ◽  
Yunlong Li ◽  
Bo Zhao ◽  
Jun Ming ◽  
Dongfeng Xue
Keyword(s):  
Homeland Security ◽  
Quantum Confinement ◽  
Room Temperature ◽  
Quantum Confinement Effect ◽  
Medical Diagnostics ◽  
Metal Halide ◽  
Large Area ◽  
X Ray ◽  
Industrial Inspection ◽  
Halide Perovskites

Abstract Scintillators are widely used for X-ray detection in various fields, such as medical diagnostics, industrial inspection and homeland security. Nanocrystals of metal halide perovskites and their analogues showed great advantages as X-ray scintillators due to their cheap manufacturing, fast decay time, and room temperature scintillation from quantum confinement effect. However, there are still many challenges unsolved for further industrialization. Herein, it is necessary to summarize the progress of scintillators based on nanocrystals of metal halide perovskites and their analogues. In first section, the scintillation mechanism and key parameters are outlined. Then, various nanocrystals of metal halide perovskites and their analogues used as scintillators are reviewed. Finally, the challenges and outlook are discussed. It is believed that nanocrystals of metal halide perovskites and their analogues are favorable for large-area and flexible X-ray detectors.

The Red Light Emission in 2D (C4SH3CH2NH3)2SnI4 and (C4OH7CH2NH3)2SnI4 Perovskites

2021 ◽  
Author(s):  
Mi Hee Jung
Keyword(s):  
Binding Energy ◽  
Quantum Confinement ◽  
Radiative Recombination ◽  
Light Emission ◽  
Red Light ◽  
Exciton Binding Energy ◽  
Two Dimensional ◽  
Large Exciton Binding Energy

Two dimensional (2D) perovskites have a large exciton binding energy due to the structure of the quantum confinement, which produces a faster radiative recombination, so it is a promising potential...

scholarly journals Quantum confinement effect and exciton binding energy of layered perovskite nanoplatelets

AIP Advances ◽  
2018 ◽  
Vol 8 (2) ◽  
pp. 025108 ◽  
Author(s):  
Qiang Wang ◽  
Xiao-Dan Liu ◽  
Yun-Hang Qiu ◽  
Kai Chen ◽  
Li Zhou ◽  
...  
Keyword(s):  
Binding Energy ◽  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Exciton Binding Energy ◽  
Confinement Effect ◽  
Layered Perovskite

scholarly journals Erratum: Low-threshold amplified spontaneous emission and lasing from colloidal nanocrystals of caesium lead halide perovskites

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Sergii Yakunin ◽  
Loredana Protesescu ◽  
Franziska Krieg ◽  
Maryna I. Bodnarchuk ◽  
Georgian Nedelcu ◽  
...  
Keyword(s):  
Spontaneous Emission ◽  
Amplified Spontaneous Emission ◽  
Colloidal Nanocrystals ◽  
Low Threshold ◽  
Halide Perovskites ◽  
Lead Halide

scholarly journals Low-threshold amplified spontaneous emission and lasing from colloidal nanocrystals of caesium lead halide perovskites

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Sergii Yakunin ◽  
Loredana Protesescu ◽  
Franziska Krieg ◽  
Maryna I. Bodnarchuk ◽  
Georgian Nedelcu ◽  
...  
Keyword(s):  
Spontaneous Emission ◽  
Amplified Spontaneous Emission ◽  
Visible Spectral Range ◽  
Colloidal Nanocrystals ◽  
Metal Halides ◽  
Uniform Size ◽  
Optical Amplification ◽  
Low Threshold ◽  
Halide Perovskites ◽  
Lead Halide

Abstract Metal halide semiconductors with perovskite crystal structures have recently emerged as highly promising optoelectronic materials. Despite the recent surge of reports on microcrystalline, thin-film and bulk single-crystalline metal halides, very little is known about the photophysics of metal halides in the form of uniform, size-tunable nanocrystals. Here we report low-threshold amplified spontaneous emission and lasing from ∼10 nm monodisperse colloidal nanocrystals of caesium lead halide perovskites CsPbX3 (X=Cl, Br or I, or mixed Cl/Br and Br/I systems). We find that room-temperature optical amplification can be obtained in the entire visible spectral range (440–700 nm) with low pump thresholds down to 5±1 μJ cm−2 and high values of modal net gain of at least 450±30 cm−1. Two kinds of lasing modes are successfully observed: whispering-gallery-mode lasing using silica microspheres as high-finesse resonators, conformally coated with CsPbX3 nanocrystals and random lasing in films of CsPbX3 nanocrystals.

scholarly journals Improved Performance of Perovskite Light-Emitting Diodes by Quantum Confinement Effect in Perovskite Nanocrystals

Nanomaterials ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 459 ◽  
Author(s):  
Lung-Chien Chen ◽  
Zong-Liang Tseng ◽  
Dai-Wei Lin ◽  
Yu-Shiang Lin ◽  
Sheng-Hui Chen
Keyword(s):  
Quantum Confinement ◽  
Light Emitting Diodes ◽  
Quantum Confinement Effect ◽  
Confinement Effect ◽  
Light Emitting ◽  
Perovskite Nanocrystals ◽  
Improved Performance

scholarly journals Mixed Conductivity of Hybrid Halide Perovskites: Emerging Opportunities and Challenges

2021 ◽  
Vol 9 ◽  
Author(s):  
Moritz H. Futscher ◽  
Jovana V. Milić
Keyword(s):  
Rechargeable Batteries ◽  
Operating Conditions ◽  
Mixed Conductivity ◽  
Light Emitting ◽  
Electronic Conductivities ◽  
Wide Range ◽  
Recent Developments ◽  
Resistive Switches ◽  
Halide Perovskites ◽  
Low Dimensional

Hybrid halide perovskites feature mixed ionic-electronic conductivities that are enhanced under device operating conditions. This has been extensively investigated over the past years by a wide range of techniques. In particular, the suppression of ionic motion by means of material and device engineering has been of increasing interest, such as through compositional engineering, using molecular modulators as passivation agents, and low-dimensional perovskite materials in conjunction with alternative device architectures to increase the stabilities under ambient and operating conditions of voltage bias and light. While this remains an ongoing challenge for photovoltaics and light-emitting diodes, mixed conductivities offer opportunities for hybrid perovskites to be used in other technologies, such as rechargeable batteries and resistive switches for neuromorphic memory elements. This article provides an overview of the recent developments with a perspective on the emerging utility in the future.

scholarly journals Unprecedented random lasing in 2D organolead halide single-crystalline perovskite microrods

Nanoscale ◽  
2020 ◽  
Vol 12 (35) ◽  
pp. 18269-18277
Author(s):  
Pradip Kumar Roy ◽  
Rajesh Kumar Ulaganathan ◽  
Chinnambedu Murugesan Raghavan ◽  
Swapnil Milind Mhatre ◽  
Hung-I Lin ◽  
...  
Keyword(s):  
Binding Energy ◽  
Free Path ◽  
Mean Free Path ◽  
Random Lasing ◽  
Strong Light ◽  
Single Crystalline ◽  
Light Confinement ◽  
Large Exciton Binding Energy ◽  
Low Threshold ◽  
Organolead Halide

Low threshold random lasing was observed in a millimeter-sized 2D single-crystalline perovskite microrod. The lower value of the threshold can be attributed to the strong light confinement, long mean free path and large exciton binding energy.

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