scholarly journals Control of spontaneous emission rate in lead halide perovskite film on hyperbolic metamaterial

2021 ◽  
Vol 2015 (1) ◽  
pp. 012153
Author(s):  
Pavel Tonkaev ◽  
Sergey Makarov
Keyword(s):  
Radiative Recombination ◽  
Emission Rate ◽  
Optoelectronic Devices ◽  
Spontaneous Emission Rate ◽  
Hyperbolic Metamaterials ◽  
Light Emitting ◽  
Hyperbolic Metamaterial ◽  
Light Emitting Devices ◽  
Halide Perovskites ◽  
Lead Halide

Abstract Hyperbolic metamaterials represent a class of nanophotonic architectures with the possibility of controlling density of optical states. Due to this property, hyperbolic metamaterials can be employed as meta-electrodes in optoelectronic devices. On the other hand, lead halide perovskites have several promising properties for application in light-emitting devices. Moreover, a perovskite film is easily deposited on a hyperbolic metamaterial surface. Here, we theoretically show how to accelerate radiative recombination in a perovskite film with a hyperbolic metamaterial. This effect can be applied in light-emitting devices, where radiative recombination is extremely important.

scholarly journals Photostable and Uniform CH3NH3PbI3 Perovskite Film Prepared via Stoichiometric Modification and Solvent Engineering

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 405
Author(s):  
Daocheng Hong ◽  
Mingyi Xie ◽  
Yuxi Tian
Keyword(s):  
Solar Cells ◽  
Optoelectronic Devices ◽  
Solvent Engineering ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Coverage Ratio ◽  
Fabrication Procedure ◽  
Fabrication Condition ◽  
Halide Perovskites ◽  
Photoluminescence Efficiency

Solution-processed organometal halide perovskites (OMHPs) have been widely used in optoelectronic devices, and have exhibited brilliant performance. One of their generally recognized advantages is their easy fabrication procedure. However, such a procedure also brings uncertainty about the opto-electric properties of the final samples and devices, including morphology, stability, coverage ratio, and defect concentration. Normally, one needs to find a balanced condition, because there is a competitive relation between these parameters. In this work, we fabricated CH3NH3PbI3 films by carefully changing the ratio of the PbI2 to CH3NH3I, and found that the stoichiometric and solvent engineering not only determined the photoluminescence efficiency and defects in the materials, but also affected the photostability, morphology, and coverage ratio. Combining solvent engineering and the substitution of PbI2 by Pb(Ac)2, we obtained an optimized fabrication condition, providing uniform CH3NH3PbI3 films with both high photoluminescence efficiency and high photostability under either I-rich or Pb-rich conditions. These results provide an optimized fabrication procedure for CH3NH3PbI3 and other OMHP films, which is crucial for the performance of perovskite-based solar cells and light emitting devices.

scholarly journals Directional and Fast Photoluminescence from CsPbI3 Nanocrystals Coupled to Dielectric Circular Bragg Gratings

Micromachines ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 422
Author(s):  
Yan Hua ◽  
Yuming Wei ◽  
Bo Chen ◽  
Zhuojun Liu ◽  
Zhe He ◽  
...  
Keyword(s):  
High Performance ◽  
Emission Rate ◽  
Bragg Gratings ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Radiative Emission ◽  
Nanophotonic Devices ◽  
Device Applications ◽  
Fundamental Research ◽  
Lead Halide

Lead halide perovskite nanocrystals (NCs), especially the all-inorganic perovskite NCs, have drawn substantial attention for both fundamental research and device applications in recent years due to their unique optoelectronic properties. To build high-performance nanophotonic devices based on perovskite NCs, it is highly desirable to couple the NCs to photonic nanostructures for enhancing the radiative emission rate and improving the emission directionality of the NCs. In this work, we synthesized high-quality CsPbI3 NCs and further coupled them to dielectric circular Bragg gratings (CBGs). The efficient couplings between the perovskite NCs and the CBGs resulted in a 45.9-fold enhancement of the photoluminescence (PL) intensity and 3.2-fold acceleration of the radiative emission rate. Our work serves as an important step for building high-performance nanophotonic light emitting devices by integrating perovskite NCs with photonic nanostructures.

Lead-free halide perovskites: review of structure-property relationship, and applications in light emitting devices and radiation detectors

2021 ◽  
Author(s):  
Yuting Gao ◽  
Yufeng Pan ◽  
Feng Zhou ◽  
Guangda Niu ◽  
Chunjie Yan
Keyword(s):  
Radiation Detectors ◽  
Lead Free ◽  
Structure Property ◽  
Excellent Performance ◽  
Widespread Application ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Structure Property Relationship ◽  
Halide Perovskites ◽  
Lead Halide

Lead halide perovskites have demonstrated excellent performance for light emitting diodes and detectors. However, the toxicity of lead (Pb) in the devices severely impedes their widespread application and commercialization. The...

Efficient light-emitting devices based on mixed-cation lead halide perovskites

2020 ◽  
Vol 77 ◽  
pp. 105546 ◽  
Author(s):  
Zewu Xiao ◽  
Qi Wang ◽  
Xiaoyuan Wu ◽  
Yanting Wu ◽  
Jie Ren ◽  
...  
Keyword(s):  
Light Emitting ◽  
Light Emitting Devices ◽  
Mixed Cation ◽  
Halide Perovskites ◽  
Lead Halide

Effect of the chemical composition on the structural, thermodynamical and mechanical properties of all-inorganic Halide Perovskites

2021 ◽  
Author(s):  
Pablo Sanchez-Palencia ◽  
Gregorio García ◽  
Perla Wahnon ◽  
Pablo Palacios
Keyword(s):  
Mechanical Properties ◽  
Solar Cells ◽  
Chemical Composition ◽  
Optoelectronic Devices ◽  
Inorganic Hybrid ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Halide Perovskites

Organic-inorganic hybrid halide perovskites are widely used in optoelectronic devices such as solar cells and light emitting devices. Pursuing solutions to a key problem of instability in most used MAPbI3,...

scholarly journals Origin of unusual bandgap shift and dual emission in organic-inorganic lead halide perovskites

2016 ◽  
Vol 2 (10) ◽  
pp. e1601156 ◽  
Author(s):  
M. Ibrahim Dar ◽  
Gwénolé Jacopin ◽  
Simone Meloni ◽  
Alessandro Mattoni ◽  
Neha Arora ◽  
...  
Keyword(s):  
Density Functional ◽  
Valence Band Maximum ◽  
Dual Emission ◽  
Time Resolved ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Perovskite Materials ◽  
Halide Perovskites ◽  
Dynamics Simulations ◽  
Increasing Temperature

Emission characteristics of metal halide perovskites play a key role in the current widespread investigations into their potential uses in optoelectronics and photonics. However, a fundamental understanding of the molecular origin of the unusual blueshift of the bandgap and dual emission in perovskites is still lacking. In this direction, we investigated the extraordinary photoluminescence behavior of three representatives of this important class of photonic materials, that is, CH3NH3PbI3, CH3NH3PbBr3, and CH(NH2)2PbBr3, which emerged from our thorough studies of the effects of temperature on their bandgap and emission decay dynamics using time-integrated and time-resolved photoluminescence spectroscopy. The low-temperature (<100 K) photoluminescence of CH3NH3PbI3and CH3NH3PbBr3reveals two distinct emission peaks, whereas that of CH(NH2)2PbBr3shows a single emission peak. Furthermore, irrespective of perovskite composition, the bandgap exhibits an unusual blueshift by raising the temperature from 15 to 300 K. Density functional theory and classical molecular dynamics simulations allow for assigning the additional photoluminescence peak to the presence of molecularly disordered orthorhombic domains and also rationalize that the unusual blueshift of the bandgap with increasing temperature is due to the stabilization of the valence band maximum. Our findings provide new insights into the salient emission properties of perovskite materials, which define their performance in solar cells and light-emitting devices.

Tunable ultra-uniform Cs4PbBr6 perovskites with efficient photoluminescence and excellent stability for high-performance white light-emitting diodes

2021 ◽  
Author(s):  
Yao Li ◽  
Kaimin Du ◽  
Manli Zhang ◽  
Xuan Gao ◽  
Yu Lu ◽  
...  
Keyword(s):  
White Light ◽  
High Performance ◽  
Light Emitting Diodes ◽  
Metal Halide ◽  
Light Emitting ◽  
New Class ◽  
Halide Perovskites ◽  
White Light Emitting Diodes ◽  
Lead Halide ◽  
Excellent Stability

Metal halide perovskites are a new class of promising materials in optoelectronic applications. As optoelectronic properties of the lead halide perovskites are determined largely by their morphology, the morphology of...

Mixed Dimensional 0D/3D Perovskite Heterostructure for Efficient Green Light Emitting Diodes

2021 ◽  
Author(s):  
Lyuchao Zhuang ◽  
Lingling Zhai ◽  
Yanyong Li ◽  
Ren Hui ◽  
Mingjie Li ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Optoelectronic Devices ◽  
Green Light ◽  
Metal Halide ◽  
Next Generation ◽  
Light Emitting ◽  
Photoelectric Characteristics ◽  
Halide Perovskites

Metal halide perovskites are emerging materials for next-generation optoelectronic devices, of which all-inorganic CsPbBr3 perovskite has attracted increasing attention due to outstanding stability and excellent photoelectric characteristics compared with organic-inorganic...

scholarly journals The dark exciton ground state promotes photon-pair emission in individual perovskite nanocrystals

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Philippe Tamarat ◽  
Lei Hou ◽  
Jean-Baptiste Trebbia ◽  
Abhishek Swarnkar ◽  
Louis Biadala ◽  
...  
Keyword(s):  
Near Infrared ◽  
Exciton State ◽  
Lead Iodide ◽  
Electron Hole ◽  
Light Emitting ◽  
Perovskite Nanocrystals ◽  
Light Emitting Devices ◽  
Optical And Electronic Properties ◽  
Wide Range ◽  
Halide Perovskites

AbstractCesium lead halide perovskites exhibit outstanding optical and electronic properties for a wide range of applications in optoelectronics and for light-emitting devices. Yet, the physics of the band-edge exciton, whose recombination is at the origin of the photoluminescence, is not elucidated. Here, we unveil the exciton fine structure of individual cesium lead iodide perovskite nanocrystals and demonstrate that it is governed by the electron-hole exchange interaction and nanocrystal shape anisotropy. The lowest-energy exciton state is a long-lived dark singlet state, which promotes the creation of biexcitons at low temperatures and thus correlated photon pairs. These bright quantum emitters in the near-infrared have a photon statistics that can readily be tuned from bunching to antibunching, using magnetic or thermal coupling between dark and bright exciton sublevels.

2D materials beyond graphene toward Si integrated infrared optoelectronic devices

Nanoscale ◽  
2020 ◽  
Vol 12 (22) ◽  
pp. 11784-11807 ◽  
Author(s):  
Changyong Lan ◽  
Zhe Shi ◽  
Rui Cao ◽  
Chun Li ◽  
Han Zhang
Keyword(s):  
2D Materials ◽  
Optoelectronic Devices ◽  
Infrared Light ◽  
Optical Modulators ◽  
Light Emitting ◽  
Light Emitting Devices

A study of typical 2D materials beyond graphene suitable for infrared applications, in particular, infrared light emitting devices, optical modulators, and photodetectors.

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