Article
Chemistry, Multidisciplinary
Guangrong Jin, Tanghao Liu, Yuanzhao Li, Jiadong Zhou, Dengliang Zhang, Peiyuan Pang, Ziqing Ye, Zhaohui Xing, Guichuang Xing, Jiangshan Chen, Dongge Ma
Summary: Quasi-2D metal halide perovskites show reduced nonradiative losses by adjusting low-dimensional phase components and trap state density, leading to high photoluminescence quantum yield and improved crystal orientation, enabling high-performance green LEDs and low-threshold ASE.
Article
Optics
Yao Zhou, Yuzhou Hu, Wenchao Zhang, Chao Liu
Summary: Cesium lead halide (CsPbX3) perovskite nanocrystals embedded glasses are promising gain media with good optical properties. The amplified spontaneous emission (ASE) is found to originate from inclusions of CsPbX3 nanocrystals in the glass, rather than the dispersed nanocrystals in the matrix. Inclusions of various sizes can generate ASE, and sustain at high energy densities. The threshold of fs laser energy densities increases with longer wavelengths, and high net optical gain coefficient is achieved.
Article
Biochemistry & Molecular Biology
Stefania Milanese, Maria Luisa De Giorgi, Luis Cerdan, Maria-Grazia La-Placa, Nur Fadilah Jamaludin, Annalisa Bruno, Henk J. Bolink, Maksym V. Kovalenko, Marco Anni
Summary: Nowadays, the search for novel active materials for laser devices is progressing rapidly. This study investigates the dependence of amplified spontaneous emission (ASE) threshold on the method used to determine it in different materials, and proposes a standard procedure to properly characterize the ASE threshold.
Article
Optics
Linjie Dai, Junzhi Ye, Neil C. Greenham
Summary: This study investigates the non-equilibrium processes in tin-lead perovskite nanocrystals and demonstrates the observation and modulation of slow relaxation. The slow cooling effect can be used to maximize the utilization of photon energy and potentially improve the efficiency of solar energy conversion.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Katelyn A. Dagnall, Ashley M. Conley, Lucy U. Yoon, Haritha S. Rajeev, Seung-Hun Lee, Joshua J. Choi
Summary: In this work, a novel method is reported to synthesize ytterbium-doped cesium lead chloride powders, which exhibit a high X-ray scintillation light yield at room temperature. With a simple and inexpensive manufacturing process, this material shows great potential for replacing current commercial scintillators.
Article
Chemistry, Physical
Donggyu Kim, Hongsun Ryu, Soo Yeon Lim, Kyle M. McCall, Jongwoo Park, Sungdo Kim, Tae Jung Kim, Jeongyong Kim, Yong Soo Kim, Mercouri G. Kanatzidis, Hyeonsik Cheong, Joon Jang
Summary: Bulk CsPbBr3 single crystals exhibit highly efficient amplified spontaneous emission with a threshold of 46 MWcm(-2) at 520 nm, when properly suppressing photoluminescence reabsorption via the indirect Rashba gap. Thin CsPbBr3 single crystals engineered into submillimeter thickness can be utilized for lasing applications.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Physical
Xixiang Zhu, Shu-Wen Dai, Ying-Lin Lai, Yixuan Dou, Miaosheng Wang, Jian-Syun Ho, Yi-An Chang, Yung-Tang Chuang, Hao-Wu Lin, Bin Hu
Summary: This study explores the packing-shape effects of amplified spontaneous emission (ASE) through orbital polarization dynamics between light-emitting excitons by stacking perovskite quantum dots of different shapes. The rod-like packing demonstrates a longer photoluminescence lifetime and a red-shifted peak compared to the diamond-like packing, indicating stronger interactions and surface-to-inside property-tuning capability. Additionally, the ASE enabled by the rod-like packing shows orbit-orbit polarization interaction between light-emitting excitons under linearly/circularly polarized pumping conditions.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Cai-Yun Zhao, Hongbo Zhao, Zhang Chen, Renjun Pei, Pei-Xi Wang
Summary: Luminescent chiral photonic crystals with tunable electronic and photonic band gaps have been fabricated using caesium lead halide perovskites. The coupling between the emission frequency and cavity resonance frequency allows for the generation of circularly polarized luminescence in the visible region.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Santu K. Bera, Suman Bera, Megha Shrivastava, Narayan Pradhan, K. V. Adarsh
Summary: This study reports the design strategy of facet engineering to reduce the gain threshold of semiconductor nanocrystal lasers. By controlling the Auger recombination rates and thermalization time through the number of facets, the gain threshold can be significantly reduced. Decreasing the sample temperature further reduces the gain threshold.
Article
Materials Science, Multidisciplinary
Jose Mendoza Carreno, Nicolas Passarelli, Clara Otero, Lakshminarayana Polaravapu, Luis A. Perez, Juan Sebastian Reparaz, Maria Isabel Alonso, Agustin Mihi
Summary: The study introduced a quasi-3D photonic crystal to enhance the photoluminescence of cesium lead halide perovskite nanocrystals, demonstrating a significant improvement in light output by combining 2D gratings and DBRs.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
You Liu, Song Gao, Chen Chen, Zichao Wu, Ping Gao, Xianglin Chen, Tianshi Qin
Summary: In this study, the successful synthesis of low-dimensional perovskite (PdEA)PbI4 and (MlEA)PbI4 single crystals by regulating intermolecular hydrogen bonding of organic ammonium ligands is reported, and their photoelectric properties are analyzed.
Article
Chemistry, Multidisciplinary
Nikita I. Selivanov, Anna Yu. Samsonova, Ruslan Kevorkyants, Irina V. Krauklis, Yuri V. Chizhov, Boris V. Stroganov, Marios E. Triantafyllou-Rundell, Detlef W. Bahnemann, Constantinos C. Stoumpos, Alexei V. Emeline, Yury V. Kapitonov
Summary: The study introduces a new family of hybrid organic-inorganic 2D lead halides, reporting the first example of the hybrid organic-inorganic post-perovskite 3-cyanopyridinium lead tribromide (3cp)PbBr3. The new material exhibits unique structural connectivity and optical properties that show significant anisotropy within the inorganic layer plane.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Thi Kim Tran Tran, Joseph A. A. Adewuyi, Yongchen Wang, M. Daniela Morales-Acosta, Tomoyasu Mani, Gael Ung, Jing Zhao
Summary: Recently, perovskite materials modified by chiral ligands have demonstrated unique chiroptical activity and potential optoelectronic applications. However, the ligands have been limited to chiral amines. In this study, chiral phosphate molecules were utilized to synthesize CsPbBr3 nanoplatelets. The nanoplatelets exhibited distinct circular dichroism signal and retained their chiroptical properties after purification with anti-solvent.
CHEMICAL COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Chinnadurai Muthu, Johnpaul K. Pious, Tino Thankachan, Nayana Krishna, Chakkooth Vijayakumar
Summary: This study reports a method of using PF gel to modify the surface of CsPbBr1.5I1.5 based mixed halide PNCs, which can effectively suppress halide ion migration and achieve stable and efficient white light emission.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Xin Huang, Yunlong Guo, Yunqi Liu
Summary: This review summarizes the recent progress of organic-inorganic hybrid perovskite photodetectors and their application in artificial photonic synapses, highlighting their great potential for the development of artificial intelligence and next generation neuromorphic computing.
CHEMICAL COMMUNICATIONS
(2021)
Article
Optics
Matthias J. Grotevent, Sergii Yakunin, Dominik Bachmann, Carolina Romero, Javier R. Vazquez de Aldana, Matteo Madi, Michel Calame, Maksym Kovalenko, Ivan Shorubalko
Summary: This paper demonstrates a Fourier-transform waveguide spectrometer using HgTe-quantum-dot-based photoconductors, with a spectral response up to 2 μm and a spectral resolution of 50 cm(-1). The small size of the spectrometer enables its integration into consumer electronics and space devices.
Article
Chemistry, Multidisciplinary
Helene Seiler, Daniela Zahn, Victoria C. A. Taylor, Maryna I. Bodnarchuk, Yoav William Windsor, Maksym V. Kovalenko, Ralph Ernstorfer
Summary: By employing femtosecond electron diffraction, the study directly measures the sub-picosecond lattice dynamics of CsPbBr3 nanocrystals and finds a light-induced structural distortion with varying time scales between 380 and 1200 fs. The distortion is attributed to the effect of exciton-polarons on the lattice and the slower dynamics at high fluences, which slows down the establishment of the exciton-polaron population. The research demonstrates the ability of direct studies of lattice dynamics on the sub-picosecond time scale to distinguish between competing scenarios proposed in the literature to explain the origin of slow hot-carrier cooling in lead halide perovskites.
Article
Chemistry, Multidisciplinary
Chenglian Zhu, Tan Nguyen, Simon C. Boehme, Anastasiia Moskalenko, Dmitry N. Dirin, Maryna I. Bodnarchuk, Claudine Katan, Jacky Even, Gabriele Raino, Maksym V. Kovalenko
Summary: All-inorganic lead-halide perovskite quantum dots have shown great potential in both classical light-emitting devices and devices exploiting strong light-matter interaction at room temperature. The study investigates the size-dependent trion and biexciton binding energies and provides insight into the multiexciton properties in these quantum dots. The findings have important implications for the development of classical and quantum optoelectronic devices.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Erik Kirstein, Evgeny A. . Zhukov, Dmitri R. . Yakovlev, Nataliia E. Kopteva, Carolin Harkort, Dennis Kudlacik, Oleh Hordiichuk, Maksym V. Kovalenko, Manfred Bayer
Summary: This research investigates the coherent spin dynamics of Ruddlesden-Popper (PEA)2PbI4 perovskites through picosecond pump-probe Kerr rotation experiments in an external magnetic field. The study identifies the Larmor spin precession of resident electrons with a spin dephasing time of 190 ps, as well as a long longitudinal spin relaxation time of 25 μs in weak magnetic fields. A significant anisotropy of the electron g-factor is also found, with in-plane value of +2.45 and out-of-plane value of +2.05. Furthermore, the exciton out-of-plane g-factor is measured to be +1.6 using magneto-reflectivity. This work contributes to the understanding of the spin-dependent properties and spin dynamics of two-dimensional perovskites.
Article
Chemistry, Multidisciplinary
Federico Montanarella, Quinten A. Akkerman, Dennis Bonatz, Maaike M. van der Sluijs, Johanna C. van der Bok, P. Tim Prins, Marcel Aebli, Alf Mews, Daniel Vanmaekelbergh, Maksym Kovalenko
Summary: Researchers have used in situ synchrotron-based small-angle X-ray scattering and optical absorption spectroscopy to gain new insights into the nucleation, growth, and self-assembly of lead halide perovskite nanocrystals. They found that dispersed 3 nm Cs[PbBr3] agglomerates are the key intermediate species, which slowly nucleate into crystals and release Cs[PbBr3] monomers for further growth. They also discovered the mechanism of spontaneous superlattice formation when the nanocrystals reach a critical size of 11.6 nm.
Article
Chemistry, Multidisciplinary
Jonas Hallstrom, Ihor Cherniukh, Xun Zha, Maksym V. Kovalenko, Alex Travesset
Summary: We develop a formula for representing cubic nanocrystals, considering the influence of ligands, and apply it to generalize to other nanocrystal shapes. We investigate the conditions under which this representation breaks down and determine the effective size. By conducting potential of mean force calculations and experimental studies, we support the relevance of specific ligand conformations and their emergence at edges and corners. Additionally, we present simulations and experimental results on cubic perovskite nanocrystals, further confirming the theoretical predictions. Our findings extend the Orbifold Topological Model beyond spherical nanocrystals and provide detailed predictions for nanocubes and spherical nanocrystals in recent superlattices. We also discuss limitations of existing united atom force fields.
Article
Chemistry, Physical
Dominic Guggisberg, Sergii Yakunin, Christoph Neff, Marcel Aebli, Detlef Gunther, Maksym V. Kovalenko, Dmitry N. Dirin
Summary: Lead halide perovskite nanocrystals are highly attractive as light-emitting materials due to their excellent properties. In this work, we demonstrate a new method to enhance the stability of these nanocrystals by coating them with thin metal oxide gel layers. The coated nanocrystals exhibit high dispersibility, stability, and photoluminescence quantum yield. The versatility of this approach is demonstrated by using different metal oxide coatings.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Carolin Harkort, Dennis Kudlacik, Natalia E. E. Kopteva, Dmitri R. R. Yakovlev, Marek Karzel, Erik Kirstein, Oleh Hordiichuk, Maksym V. V. Kovalenko, Manfred Bayer
Summary: This article discusses the optical properties and spin phenomena of Ruddlesden-Popper type (PEA)(2)PbI4 perovskites. The Zeeman splitting of electrons and holes in a magnetic field was measured using spin-flip Raman scattering. The electron and hole g factors were evaluated, their anisotropies were measured, and the dynamic nuclear spin polarization induced by spin-polarized holes was detected.
Article
Chemistry, Physical
Huanyu Zhang, Giulia Paggiaro, Faruk Okur, Janis Huwiler, Claudia Cancellieri, Lars P. H. Jeurgens, Dmitry Chernyshov, Wouter van Beek, Maksym V. Kovalenko, Kostiantyn V. Kravchyk
Summary: The deployment of LLZO garnets as solid-state electrolytes for Li-metal solid-state batteries is hindered by the reactivity with water and carbon dioxide, leading to the formation of a contamination layer on the LLZO surface. High temperature annealing is studied as a thermal cleaning method, which effectively reduces the contamination but also results in the formation of a different phase on the LLZO surface. The impact of these factors on the performance of Li/LLZO/Li symmetrical cells was evaluated.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Christina Limantoro, Theerthankar Das, Meng He, Dmitry Dirin, Jim Manos, Maksym V. Kovalenko, Wojciech Chrzanowski
Summary: Antibiotic resistance is a global public health problem that requires the development of new alternative treatments. Metallic nanoparticles, with their unique properties and mechanisms, are an attractive option. This study tested the effects of gallium nanoparticles on clinical strains of Pseudomonas aeruginosa and multi-drug-resistant Acinetobacter baumannii, and found that they had an effect on biofilm formation.
Article
Chemistry, Multidisciplinary
Stefan Grisard, Artur V. V. Trifonov, Ivan A. A. Solovev, Dmitri R. R. Yakovlev, Oleh Hordiichuk, Maksym V. V. Kovalenko, Manfred Bayer, Ilya A. A. Akimov
Summary: The compositional engineering of hybrid organic-inorganic lead halide perovskites is crucial for efficient solar cells and light-emitting devices. A study on the effect of bandgap fluctuations on coherent exciton dynamics in a mixed FA(0.9)Cs(0.1)PbI(2.8)Br(0.2) perovskite crystal using photon echo spectroscopy reveals a narrow homogeneous exciton line width and an exceptionally long exciton coherence time due to exciton localization at the nanoscale. The spectral and temperature dependences of the photon echo decay indicate that pure decoherence associated with elastic scattering on phonons is comparable with the exciton lifetime for low-energy excitons, while inelastic scattering to lower energy states dominates for high-energy excitons through phonon emission.
Article
Chemistry, Multidisciplinary
Huanyu Zhang, Romain Dubey, Michael Inniger, Faruk Okur, Robin Wullich, Annapaola Parrilli, Dogan Tarik Karabay, Antonia Neels, Kostiantyn Kravchyk, Maksym Kovalenko
Summary: A facile and ultrafast sintering methodology has been developed for the fabrication of self-standing bilayer dense-porous LLZO membranes as solid-state electrolytes. The LLZO membranes show high critical current density, making them promising for non-flammable lithium-ion batteries with high energy density.
CELL REPORTS PHYSICAL SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Natalia E. Kopteva, Dmitri R. Yakovlev, Erik Kirstein, Evgeny A. Zhukov, Dennis Kudlacik, Ina V. Kalitukha, Victor F. Sapega, Oleh Hordiichuk, Dmitry N. Dirin, Maksym V. Kovalenko, Andreas Baumann, Julian Hoecker, Vladimir Dyakonov, Scott A. Crooker, Manfred Bayer
Summary: The optical properties of lead halide perovskite semiconductors near the bandgap are controlled by excitons. The exciton Landé or g-factor g(X) is a key parameter measured by reflectivity in magnetic fields. Exciton g-factors remain nearly constant in different lead halide perovskite crystals.
Article
Materials Science, Multidisciplinary
Paris Papagiorgis, Marios Sergides, Andreas Manoli, Modestos Athanasiou, Caterina Bernasconi, Fedros Galatopoulos, Apostolos Ioakeimidis, Constantinos Nicolaides, Epameinondas Leontidis, Theodossis Trypiniotis, Stelios Choulis, Maryna I. Bodnarchuk, Maksym V. Kovalenko, Andreas Othonos, Grigorios Itskos
Summary: Ligand exchange during or after the colloidal synthesis of nanocrystals enables the production of conductive nanocrystal solids for optoelectronics. A post-synthetic ligand washing process was developed, leading to increased photoconductance and improved optoelectronic properties for both FAPbI3 and CsPbBr3 nanocrystals.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Dmitri R. Yakovlev, Scott A. Crooker, Marina A. Semina, Janina Rautert, Johannes Mund, Dmitry N. Dirin, Maksym V. Kovalenko, Manfred Bayer
Summary: This study investigates exciton-polaritons in solution-grown CsPbBr3 crystals by measuring circularly polarized reflection spectroscopy in high magnetic fields. Detailed quantitative information about the exciton-polariton parameters was obtained, showing that the exciton states can be described using a hydrogen-like model.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2023)
