Search results for: Andrey L. Rogach

Items from 1 to 20 out of 153 results

article

Red‐Emitting CsPbI₃/ZnSe Colloidal Nanoheterostructures with Enhanced Optical Properties and Stability

Kunnathodi Vighnesh, Aleksandr A. Sergeev, Md Samim Hassan, Arsenii S. Portniagin, more

Small > 20 > 40 > n/a - n/a

Producing heterostructures of cesium lead halide perovskites and metal‐chalcogenides in the form of colloidal nanocrystals can improve their optical features and stability, and also govern the recombination of charge carriers. Herein, the synthesis of red‐emitting CsPbI₃/ZnSe nanoheterostructures is reported via an in situ hot injection method, which provides the crystallization conditions for both...

article

The Rise of HgTe Colloidal Quantum Dots for Infrared Optoelectronics

Kseniia A. Sergeeva, Huichen Zhang, Arsenii S. Portniagin, Erwan Bossavit, more

Advanced Functional Materials > 34 > 39 > n/a - n/a

Among materials produced as colloidal quantum dots (CQDs), HgTe has a special status being the only material covering the whole infrared range from the visible to the THz (0.7–100 µm). This unique property resulting from its electronic structure, combined with an air stability and a capacity for charge conduction has generated consistent and massive efforts to produce and improve HgTe CQDs over the...

article

Removing Cadmium Impurities from Cation‐Exchange‐Derived CuInSe₂/CuInS₂ Nanorods for Enhanced Infrared Emission and Photodetection

Arsenii S. Portniagin, Aleksandr A. Sergeev, Kseniia A. Sergeeva, Shixun Wang, more

Advanced Functional Materials > 34 > 34 > n/a - n/a

Metal chalcogenide nanocrystals with variable composition and shape can conveniently be produced using cation exchange synthesis; however, the presence of cation‐containing ligands inherited from the starting material often results in contamination of the final product. To address this issue, a two‐step ligand replacement strategy is developed to fabricate CuInSe₂/CuInS₂ nanorods from CdSe/CdS nanorods...

article

Optical Properties Prediction for Red and Near‐Infrared Emitting Carbon Dots Using Machine Learning

Vladislav S. Tuchin, Evgeniia A. Stepanidenko, Anna A. Vedernikova, Sergei A. Cherevkov, more

Small > 20 > 29 > n/a - n/a

Functional nanostructures build up a basis for the future materials and devices, providing a wide variety of functionalities, a possibility of designing bio‐compatible nanoprobes, etc. However, development of new nanostructured materials via trial‐and‐error approach is obviously limited by laborious efforts on their syntheses, and the cost of materials and manpower. This is one of the reasons for...

article

Ultraviolet Circularly Polarized Luminescence in Chiral Perovskite Nanoplatelet‐Molecular Hybrids: Direct Binding Versus Efficient Triplet Energy Transfer

Bing Tang, Qi Wei, Shixun Wang, Haochen Liu, more

Small > 20 > 25 > n/a - n/a

The development of ultraviolet circularly polarized light (UVCPL) sources has the potential to benefit plenty of practical applications but remains a challenge due to limitations in available material systems and a limited understanding of the excited state chirality transfer. Herein, by constructing hybrid structures of the chiral perovskite CsPbBr₃ nanoplatelets and organic molecules, excited state...

article

Fine‐Tuning Crystal Structures of Lead Bromide Perovskite Nanocrystals through Trace Cadmium(II) Doping for Efficient Color‐Saturated Green LEDs

Jianfeng Zhang, Junhui Wang, Lei Cai, Sheng Wang, more

Angewandte Chemie > 136 > 26 > n/a - n/a

Decreasing perovskite nanocrystal size increases radiative recombination due to the quantum confinement effect, but also increases the Auger recombination rate which leads to carrier imbalance in the emitting layers of electroluminescent devices. Here, we overcome this trade‐off by increasing the exciton effective mass without affecting the size, which is realized through the trace Cd²⁺ doping of...

article

Fine‐Tuning Crystal Structures of Lead Bromide Perovskite Nanocrystals through Trace Cadmium(II) Doping for Efficient Color‐Saturated Green LEDs

Jianfeng Zhang, Junhui Wang, Lei Cai, Sheng Wang, more

Angewandte Chemie International Edition > 63 > 26 > n/a - n/a

article

Obviating Ligand Exchange Preserves the Intact Surface of HgTe Colloidal Quantum Dots and Enhances Performance of Short Wavelength Infrared Photodetectors

Kseniia A. Sergeeva, Sile Hu, Anastasiia V. Sokolova, Arsenii S. Portniagin, more

Advanced Materials > 36 > 17 > n/a - n/a

A large volume, scalable synthesis procedure of HgTe quantum dots (QDs) capped initially with short‐chain conductive ligands ensures ligand exchange‐free and simple device fabrication. An effective n‐ or p‐type self‐doping of HgTe QDs is achieved by varying cation–anion ratio, as well as shifting the Fermi level position by introducing single‐ or double‐cyclic thiol ligands, that is, 2‐furanmethanethiol...

article

Organic–Inorganic Copper Halide Compound with a Near‐Unity Emission: Large‐Scale Synthesis and Diverse Light‐Emitting Applications

Kunlin Chen, Bingkun Chen, Lingling Xie, Xitao Li, more

Advanced Functional Materials > 34 > 10 > n/a - n/a

Low‐dimensional organic–inorganic metal halides (OIMHs) have emerged as promising light emitters due to their broadband emission originating from self‐trapped excitons (STE), especially for Cu‐based OIMHs. Herein, Cu(I)‐based OIMH with a structure of (TPP)₂Cu₄I₆·2DMSO (TPP stays for tetraphenylphosphonium, and DMSO – for dimethyl sulfoxide) has been synthesized, both in form of single crystals and...

article

Perovskite Cathodes for Aqueous and Organic Iodine Batteries Operating Under One and Two Electrons Redox Modes

Xinliang Li, Shixun Wang, Dechao Zhang, Pei Li, more

Advanced Materials > 36 > 4 > n/a - n/a

Although conversion‐type iodine‐based batteries are considered promising for energy storage systems, stable electrode materials are scarce, especially for high‐performance multi‐electron reactions. The use of tin‐based iodine‐rich 2D Dion–Jacobson (DJ) ODASnI₄ (ODA: 1,8‐octanediamine) perovskite materials as cathode materials for iodine‐based batteries is suggested. As a proof of concept, organic...

article

Core/Shell ZnO/ZnS Nanoparticle Electron Transport Layers Enable Efficient All‐Solution‐Processed Perovskite Light‐Emitting Diodes

Fan Cao, Qianqian Wu, Wunan Li, Sheng Wang, more

Small > 19 > 16 > n/a - n/a

Solution‐processed perovskite‐based light‐emitting diodes (PeLEDs) are promising candidates for low‐cost, large‐area displays, while severe deterioration of the perovskite light‐emitting layer occurs during deposition of electron transport layers from solution in an issue. Herein, core/shell ZnO/ZnS nanoparticles as a solution‐processed electron transport layer in PeLED based on quasi‐2D PEA₂Cs_n−1...

article

Stability of Perovskite Light‐Emitting Diodes: Existing Issues and Mitigation Strategies Related to Both Material and Device Aspects

Lingmei Kong, Xiaoyu Zhang, Chengxi Zhang, Lin Wang, more

Advanced Materials > 34 > 43 > n/a - n/a

Metal halide perovskites combine excellent electronic and optical properties, such as defect tolerance and high photoluminescence efficiency, with the benefits of low‐cost, large‐area, solution‐based processing. Composition‐ and dimension‐tunable properties of perovskites have already been utilized in bright and efficient light‐emitting diodes (LEDs). At the same time, there are still great challenges...

article

Stability of Perovskite Light‐Emitting Diodes: Existing Issues and Mitigation Strategies Related to Both Material and Device Aspects (Adv. Mater. 43/2022)

Lingmei Kong, Xiaoyu Zhang, Chengxi Zhang, Lin Wang, more

Advanced Materials > 34 > 43 > n/a - n/a

Perovskite Light‐Emitting Diodes Although the efficiency of perovskite light‐emitting diodes (LEDs) has reached commercial requirements, their operational lifetime is still challenging. In article number 2205217, Xiaoyu Zhang, Andrey L. Rogach, Xuyong Yang, and co‐workers review recent advances in the lifetime of perovskite LEDs, the origins of instability in perovskite LEDs, and strategies to improve...

article

White Light Afterglow in Carbon Dots Achieved via Synergy between the Room‐Temperature Phosphorescence and the Delayed Fluorescence

Jinyang Zhu, Junhua Hu, Qiang Hu, Xiaoyu Zhang, more

Small > 18 > 1 > n/a - n/a

Carbon dot (CD) based long‐lived afterglow emission materials have attracted attention in recent years, but demonstration of white‐light room‐temperature afterglow remains challenging, due to the difficulty of simultaneous generation of multiple long‐lived excited states with distinct chromatic emission. In this work, a white‐light room‐temperature long‐lived afterglow emission from a CD powder with...

article

Optical Properties of Carbon Dots in the Deep‐Red to Near‐Infrared Region Are Attractive for Biomedical Applications

Di Li, Elena V. Ushakova, Andrey L. Rogach, Songnan Qu

Small > 17 > 43 > n/a - n/a

Carbon dots (CDs) represent a recently emerged class of luminescent materials with a great potential for biomedical theranostics, and there are a lot of efforts to shift their absorption and emission toward deep‐red (DR) to near‐infrared (NIR) region falling in the biological transparency window. This review offers comprehensive insights into the synthesis strategies aimed to achieve this goal, and...

article

Strongly Luminescent Dion–Jacobson Tin Bromide Perovskite Microcrystals Induced by Molecular Proton Donors Chloroform and Dichloromethane

Shixun Wang, Jasminka Popović, Sanja Burazer, Arsenii Portniagin, more

Advanced Functional Materials > 31 > 28 > n/a - n/a

Lead‐free 2D perovskites based on tin halide octahedron slabs with Dion–Jacobson (DJ) phases have drawn attention due to their improved stability; still, reports on light‐emitting DJ lead‐free perovskites are scarce. Herein, a room‐temperature ligand assisted re‐precipitation method is used to produce ODASnBr₄ perovskite microcrystals (ODA denotes protonated 1,8‐octanediamine). After incorporating...

article

Carbon Nanoparticles as Versatile Auxiliary Components of Perovskite‐Based Optoelectronic Devices

Aleksandr P. Litvin, Xiaoyu Zhang, Elena V. Ushakova, Andrey L. Rogach

Advanced Functional Materials > 31 > 18 > n/a - n/a

Metal halide perovskite‐based optoelectronics has experienced an unprecedented development in the last decade, while further improvements of efficiency, stability, and economic gains of such devices require novel engineering concepts. The use of carbon nanoparticles as versatile auxiliary components of perovskite‐based optoelectronic devices is one strategy that offers several advantages in this respect...

article

Metal Halide Perovskites: Metal Halide Perovskite Nanorods: Shape Matters (Adv. Mater. 46/2020)

Chengxi Zhang, Jiayi Chen, Sheng Wang, Lingmei Kong, more

Advanced Materials > 32 > 46 > n/a - n/a

Metal‐halide‐perovskite nanocrystals display shape‐dependent optoelectronic properties that underpin a wide range of stimulating applications. In article number 2002736, Xuyong Yang, Andrey L. Rogach, Guohua Jia, and co‐workers review the recent advances in metal‐halide‐perovskite nanorods, spanning the crystal structures, growth mechanisms, enhanced properties, and widespread applications in solar...

article

Metal Halide Perovskite Nanorods: Shape Matters

Chengxi Zhang, Jiayi Chen, Sheng Wang, Lingmei Kong, more

Advanced Materials > 32 > 46 > n/a - n/a

Quasi‐1D metal halide perovskite nanorods (NRs) are emerging as a type of materials with remarkable optical and electronic properties. Research into this field is rapidly expanding and growing in the past several years, with significant advances in both mechanistic studies of their growth and widespread possible applications. Here, the recent advances in 1D metal halide perovskite nanocrystals (NCs)...

article

Two‐Step Oxidation Synthesis of Sulfur with a Red Aggregation‐Induced Emission

Zhenguang Wang, Chuanchuan Zhang, Henggang Wang, Yuan Xiong, more

Angewandte Chemie > 132 > 25 > 10083 - 10088

Sulfur is not normally considered a light‐emitting material, even though there have been reports of a dim luminescence of this compound in the blue‐to‐green spectral region. Now, it is shown how to make red‐emissive sulfur by a two‐step oxidation approach using elemental sulfur and Na₂S as starting materials, with a high photoluminescence quantum yield of 7.2 %. Polysulfide is formed first and is...

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Search results for: Andrey L. Rogach

Red‐Emitting CsPbI₃/ZnSe Colloidal Nanoheterostructures with Enhanced Optical Properties and Stability

The Rise of HgTe Colloidal Quantum Dots for Infrared Optoelectronics

Removing Cadmium Impurities from Cation‐Exchange‐Derived CuInSe₂/CuInS₂ Nanorods for Enhanced Infrared Emission and Photodetection

Optical Properties Prediction for Red and Near‐Infrared Emitting Carbon Dots Using Machine Learning

Ultraviolet Circularly Polarized Luminescence in Chiral Perovskite Nanoplatelet‐Molecular Hybrids: Direct Binding Versus Efficient Triplet Energy Transfer

Fine‐Tuning Crystal Structures of Lead Bromide Perovskite Nanocrystals through Trace Cadmium(II) Doping for Efficient Color‐Saturated Green LEDs

Fine‐Tuning Crystal Structures of Lead Bromide Perovskite Nanocrystals through Trace Cadmium(II) Doping for Efficient Color‐Saturated Green LEDs

Obviating Ligand Exchange Preserves the Intact Surface of HgTe Colloidal Quantum Dots and Enhances Performance of Short Wavelength Infrared Photodetectors

Organic–Inorganic Copper Halide Compound with a Near‐Unity Emission: Large‐Scale Synthesis and Diverse Light‐Emitting Applications

Perovskite Cathodes for Aqueous and Organic Iodine Batteries Operating Under One and Two Electrons Redox Modes

Core/Shell ZnO/ZnS Nanoparticle Electron Transport Layers Enable Efficient All‐Solution‐Processed Perovskite Light‐Emitting Diodes

Stability of Perovskite Light‐Emitting Diodes: Existing Issues and Mitigation Strategies Related to Both Material and Device Aspects

Stability of Perovskite Light‐Emitting Diodes: Existing Issues and Mitigation Strategies Related to Both Material and Device Aspects (Adv. Mater. 43/2022)

White Light Afterglow in Carbon Dots Achieved via Synergy between the Room‐Temperature Phosphorescence and the Delayed Fluorescence

Optical Properties of Carbon Dots in the Deep‐Red to Near‐Infrared Region Are Attractive for Biomedical Applications

Strongly Luminescent Dion–Jacobson Tin Bromide Perovskite Microcrystals Induced by Molecular Proton Donors Chloroform and Dichloromethane

Carbon Nanoparticles as Versatile Auxiliary Components of Perovskite‐Based Optoelectronic Devices

Metal Halide Perovskites: Metal Halide Perovskite Nanorods: Shape Matters (Adv. Mater. 46/2020)

Metal Halide Perovskite Nanorods: Shape Matters

Two‐Step Oxidation Synthesis of Sulfur with a Red Aggregation‐Induced Emission

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