Martin Vácha
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View article: 1D Silver Organochalcogenide Semiconductors: Color Tunable Luminescence, Polarized Emission, and Long-Range Exciton Diffusion
1D Silver Organochalcogenide Semiconductors: Color Tunable Luminescence, Polarized Emission, and Long-Range Exciton Diffusion Open
Metal organochalcogenides (MOCs) represent a promising class of organic-inorganic hybrid semiconductors with unique light-matter interactions. Their hybrid nature enables extensive structural and optoelectronic tunability via ligand engine…
View article: Microscopic Intricacies of Self-Healing in Halide Perovskite-Charge Transport Layer Heterostructures
Microscopic Intricacies of Self-Healing in Halide Perovskite-Charge Transport Layer Heterostructures Open
The stability and performance of halide perovskite photovoltaic devices are critically limited by progressive defect generation and associated local non-radiative losses during operation. Self-healing of defects provides a promising pathwa…
View article: Microscopic Intricacies of Self-Healing in Halide Perovskite-Charge Transport Layer Heterostructures
Microscopic Intricacies of Self-Healing in Halide Perovskite-Charge Transport Layer Heterostructures Open
The stability and performance of halide perovskite photovoltaic devices are critically limited by progressive defect generation and associated local non-radiative losses during operation. Self-healing of defects provides a promising pathwa…
View article: Chelation-Driven Dissolution and Single-Crystal Growth of Hybrid Metal Organochalcogenide Semiconductors by Polydentate Amines
Chelation-Driven Dissolution and Single-Crystal Growth of Hybrid Metal Organochalcogenide Semiconductors by Polydentate Amines Open
The ability to grow single crystals is critical to modern society, particularly forming the foundation of the semiconductor industry that drives transformative innovations. While inorganic semiconductors are typically grown using melt-base…
View article: Vortex-Flow-Directed Chiral Macroscopic Ordering of Platelet Nanostructures Formed via the Supramolecular Assembly of Platinum Complexes with Bis(phenylisoxazolyl)benzene
Vortex-Flow-Directed Chiral Macroscopic Ordering of Platelet Nanostructures Formed via the Supramolecular Assembly of Platinum Complexes with Bis(phenylisoxazolyl)benzene Open
To understand the vortex flow-directed circular dichroism (CD) effect observed in homogeneous solutions containing supramolecular structures, the macroscopic order formed by supramolecular structures oriented within a flow must be visualiz…
View article: Anisotropic Cation Migration Drives the Formation and Stability of Lateral 3D/2D Perovskite Heterostructures
Anisotropic Cation Migration Drives the Formation and Stability of Lateral 3D/2D Perovskite Heterostructures Open
View article: Unveiling the Local Fate of Charge Carriers in Halide Perovskite Thin Films via Correlation Clustering Imaging
Unveiling the Local Fate of Charge Carriers in Halide Perovskite Thin Films via Correlation Clustering Imaging Open
As the field of metal halide perovskites matures, a range of compositionally different perovskite films has found a place in efficient optoelectronic devices. These films feature variable local structural stability, carrier diffusion, and …
View article: E-LEARNING IN THE CZECH REPUBLIC DURING THE SECOND YEAR OF PANDEMIC COVID-19
E-LEARNING IN THE CZECH REPUBLIC DURING THE SECOND YEAR OF PANDEMIC COVID-19 Open
The aim of this research is to map the situation of online education in the Czech Republic and compare it with the European one. The research was conducted based on data provided by the Czech Statistical Office and Eurostat. The evaluated …
View article: Resolving Multi-Asperity Contacts at the Nanoscale through Super-Resolution Fluorescence Imaging
Resolving Multi-Asperity Contacts at the Nanoscale through Super-Resolution Fluorescence Imaging Open
Contact mechanics, spanning nanometer to tectonic scales, faces long-standing challenges arising from multiscale random roughness, which hinders experimental validation of theories. Understanding multi-asperity rough contacts is vital for …
View article: In Situ Monitoring of Nanocrystal Formation and Ion Migration in Lead Halide Perovskite Metal–Organic Framework Composites
In Situ Monitoring of Nanocrystal Formation and Ion Migration in Lead Halide Perovskite Metal–Organic Framework Composites Open
Combining all‐inorganic perovskites (CsPbX 3 ) with metal–organic frameworks (MOFs) offers great promise for efficient optoelectronic applications, but a lack of understanding of the microscopic mechanisms of host‐guest interactions that l…
View article: Dynamic molecular conformational change leading to energy transfer in F8-5% BSP copolymer revealed by single-molecule spectroscopy
Dynamic molecular conformational change leading to energy transfer in F8-5% BSP copolymer revealed by single-molecule spectroscopy Open
Polyfluorene-based copolymers such as poly(9,9-dioctylfluorene)-alt-5% [bis-N,N′-(4-butylphenyl)-bis-N,N′-phenyl-1,4-phenylenediamine] (F8-5% BSP) are efficient blue-emitting polymers with various electronic phases: F8 blue-emitting glassy…
View article: Excitonic coupling directly revealed on single chains of polyfluorene by combined force spectroscopy and fluorescence microscopy
Excitonic coupling directly revealed on single chains of polyfluorene by combined force spectroscopy and fluorescence microscopy Open
Molecular aggregates were discovered in 1930’s, yet, the forces and excitonic coupling energy associated with the aggregate formation have not been detected so far. We directly measure such force and energy on single chains of the conjugat…
View article: Real-time molecular-level visualization of mass flow during patterned photopolymerization of liquid-crystalline monomers
Real-time molecular-level visualization of mass flow during patterned photopolymerization of liquid-crystalline monomers Open
Single-particle fluorescence imaging is used to monitor dynamic processes that occur during patterned photopolymerization of liquid-crystalline monomers. A spatial gradient of chemical potential can be created at the border of bright and d…
View article: Ageing of Polymer Frictional Interfaces: The Role of Quantity and Quality of Contact
Ageing of Polymer Frictional Interfaces: The Role of Quantity and Quality of Contact Open
When two objects are in contact, the force necessary for one to start sliding over the other is larger than the force necessary to keep the sliding motion going. This difference between static and dynamic friction is thought to result from…
View article: (Hypocalcemia-induced dilated cardiomyopathy)
(Hypocalcemia-induced dilated cardiomyopathy) Open
Hypokalcemie je vzácnou, avšak potenciálně reverzibilní příčinou dilatační kardiomyopatie. Nejčastěji je způsobena hypoparathyreózou. V následující kazuistice je popsán případ 74letého pacienta s dilatační kardiomyopatií, která byla vyvolá…
View article: Single-particle electroluminescence of CsPbBr3 perovskite nanocrystals reveals particle-selective recombination and blinking as key efficiency factors
Single-particle electroluminescence of CsPbBr3 perovskite nanocrystals reveals particle-selective recombination and blinking as key efficiency factors Open
View article: Narrow band-edge photoluminescence from AgInS2 semiconductor nanoparticles by the formation of amorphous III–VI semiconductor shells
Narrow band-edge photoluminescence from AgInS2 semiconductor nanoparticles by the formation of amorphous III–VI semiconductor shells Open
Silver indium sulfide (AgInS2) semiconductor nanoparticles are cadmium-free quantum dots emitting in visible to near infrared regions. The present study demonstrates the narrowing of their broad defect emission by coating AgInS2 core nanop…
View article: Macrocyclic poly(<i>p</i>-phenylenevinylene)s by ring expansion metathesis polymerisation and their characterisation by single-molecule spectroscopy
Macrocyclic poly(<i>p</i>-phenylenevinylene)s by ring expansion metathesis polymerisation and their characterisation by single-molecule spectroscopy Open
Ring expansion metathesis polymerisation (REMP) has proven to be a viable approach to prepare high purity macrocyclic phenylenevinylene polymers.
View article: Correction: Efficient triplet–triplet annihilation upconversion in binary crystalline solids fabricated <i>via</i> solution casting and operated in air
Correction: Efficient triplet–triplet annihilation upconversion in binary crystalline solids fabricated <i>via</i> solution casting and operated in air Open
Correction for ‘Efficient triplet–triplet annihilation upconversion in binary crystalline solids fabricated via solution casting and operated in air’ by Kenji Kamada et al., Mater. Horiz., 2017, 4, 83–87.
View article: Photophysics and electroluminescence of single nanocrystals of halide perovskites and related nanomaterials
Photophysics and electroluminescence of single nanocrystals of halide perovskites and related nanomaterials Open
We report simultaneous photoluminescence and electroluminescence single-particle study of nanocrystals of inorganic halide perovskite CsPbBr 3 , as well as of ternary I-III-IV semiconductor quantum dots.
View article: Efficient triplet–triplet annihilation upconversion in binary crystalline solids fabricated <i>via</i> solution casting and operated in air
Efficient triplet–triplet annihilation upconversion in binary crystalline solids fabricated <i>via</i> solution casting and operated in air Open
Binary crystalline solids via solution casting under rapid drying conditions were found to show efficient triplet–triplet annihilation upconversion by suppressing the segregation of the components.
View article: Latest impact factor
Latest impact factor Open
View article: Phosphorescence: Photoreversible On–Off Recording of Persistent Room‐Temperature Phosphorescence (Advanced Optical Materials 12/2015)
Phosphorescence: Photoreversible On–Off Recording of Persistent Room‐Temperature Phosphorescence (Advanced Optical Materials 12/2015) Open
A host–guest–guest material is prepared by S. Hirata and co-workers on page 1726 to demonstrate the photoreversible on–off recording of persistent room-temperature phosphorescence from the phosphorescent guest. The reversible photocyclizat…
View article: Erratum: Editorial for 2015
Erratum: Editorial for 2015 Open
Correction to: NPG Asia Materials (2015) 7, e160; doi:10.1038/am.2015.1; published online 20 February 2015 After publication of this article, it has come to our attention that there is a formatting error in this article. Header text in the…
View article: Editorial for 2015
Editorial for 2015 Open
View article: Long-lived Triplet Excitons Allowed by Intermolecular Hydrogen Bonding in Amorphous Matrix
Long-lived Triplet Excitons Allowed by Intermolecular Hydrogen Bonding in Amorphous Matrix Open
A purely organic guest material with a long triplet excited state lifetime (τ > 1 s) was doped into two different π-conjugated amorphous hosts with similar glass transition temperatures (Tg). The phosphorescence quenching behavior of the g…