Defects have always been an integral part of semiconductor crystals, controlling their optical and electronic properties. Even though growing popularity the CsPbX3 (X = Cl, Br, I, mixture) nanocrystals (NCs) in various applications stems from defect-tolerant nature, properties, stability, practical utility these substances are still very much governed by defects. A variety methods, which halide-specific, developed to regulate activities defects for enhancing photoluminescence stability NCs....

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTBoosting the Photoluminescence of CsPbX3 (X = Cl, Br, I) Perovskite Nanocrystals Covering a Wide Wavelength Range by Postsynthetic Treatment with Tetrafluoroborate SaltsTasnim AhmedTasnim AhmedSchool Chemistry, University Hyderabad, Hyderabad 500046, IndiaMore Tasnim Ahmedhttp://orcid.org/0000-0002-5990-3891, Sudipta SethSudipta SethSchool Seth, and Anunay Samanta*Anunay SamantaSchool India*A.S. E-mail: [email protected]More...

Study of the emission behavior all-inorganic perovskite nanocrystals CsPbBr3 and CsPbBr2I as a function excitation power employing fluorescence correlation spectroscopy conventional techniques reveals blinking in microsecond time scale photoinduced enhancement. The observation provides insight into radiative nonradiative deactivation pathways these promising substances. Because both photoactivation processes are intimately linked to charge separation efficiency dynamics nanocrystals, key...

Abstract A facile and highly reproducible room temperature, open atmosphere synthesis of cesium lead halide perovskite nanocrystals six different morphologies is reported just by varying the solvent, ligand reaction time. Sequential evolution quantum dots, nanoplates nanobars in one medium nanocubes, nanorods nanowires another demonstrated. These nanoparticles are shown to be excellent crystalline quality with high fluorescence yield. mechanism formation shapes sizes proposed. Considering...

Quantum-confined perovskites are a new class of promising materials in optoelectronic applications. In this context, zero-dimensional perovskite-related substance, Cs4PbBr6, having high exciton binding energy can be an important candidate, but its photoluminescence (PL) is topic recent debate. Herein, we report ambient condition controlled synthesis Cs4PbBr6 microdisks different shapes and dimensions which exhibit fairly strong green PL (quantum yield up to 38%, band gap ∼2.43 eV) the solid...

Zero-dimensional (0-D) perovskites and perovskite-related materials are an emerging class of optoelectronic exhibiting strong excitonic properties and, quite often, high photoluminescence (PL) in the solid state. Here we highlight two different classes 0-D with contrasting structural optical properties, focusing mainly on less explored but rapidly growing bulk quantum termed as (0-D PRMs), whose PL intriguing a topic recent debate. We attempt to present here comprehensive picture rationalize...

Lead halide perovskite nanocrystals (NCs) apart from their overwhelming optoelectronic applications have recently demonstrated promising nonlinear optical (NLO) properties such as strong two-photon absorption cross-sections (∼105 GM), fluorescence, and saturable even at very high peak intensity. Zero-dimensional perovskite-related materials (0-D PRMs) are a new class of offering exciton binding energy (Eg ≥ 180 meV) with photoluminescence (PL) quantum yield in few cases. Herein, we report...

We report the broadband nonlinear optical (NLO) properties of CsPbBr3 perovskite films achieved from colloidal nanocrystals prepared following a room temperature and open atmosphere anti-solvent precipitation method. The NLO studies were performed on nanocubes (NCs) nanorods (NRs) using Z-scan technique with 1 kHz femtosecond pulses at 600, 700, 800 nm. Large two-photon absorption cross sections (∼105 GM) retrieved by fitting open-aperture data. Strong third-order susceptibility (∼10-10 esu)...

To obtain an in-depth understanding of the dynamics and mechanism carrier recombination in CsPbBr3 nanocrystals (NCs), we have investigated photoluminescence (PL) this material at single-particle level using time-tagged–time-resolved method. The study reveals two distinct types PL fluctuations NCs, which are assigned to flickering blinking. is found be due excess surface trap on single particles transformed into blinking ones with significant enhancement intensity stability postsynthetic...

Exploration of the full potential perovskite nanocrystals (NCs) for different applications requires a thorough understanding pathways recombination photogenerated charge carriers and associated dynamics. In this work, we have tracked routes by probing photoluminescence (PL) intermittency immobilized freely diffusing single CsPbBr3 NCs employing time-tagged-time-resolved method. The show complex PL time-trace, careful analysis which reveals that nonradiative band-edge through trap states,...

Abstract Conventional amine‐capped perovskite nanocrystals (A‐PNCs) often show microscopic fluctuation (blinking) of photoluminescence (PL) between bright and near‐background (dark) states. The transient dark phases spanning milliseconds (ms) to several seconds timescale typically owe the non‐radiative (NR) fate charge carriers in crystal defect states, limiting PNC's efficiency optoelectronics. A PL study a novel trioctylphosphine (TOP) capped rhombic cuboctahedron‐shaped amine‐free (AF)...

The recent emergence of metal halide perovskites as triplet sensitizers has generated new possibilities in optoelectronics, the exploitation which requires an understanding characteristics band-edge excitons and mechanistic details sensitization long-lived molecular triplets. In this Perspective, we first examine energetics perovskite nanocrystals, characterize excitons, introduce dark that participate sensitization. We then investigate mechanism triplets organic molecules anchored on 3D...

Abstract Metal halide perovskites are an important class of emerging semiconductors. Their charge carrier dynamics is poorly understood due to limited knowledge defect physics and recombination mechanisms. Nevertheless, classical ABC Shockley-Read-Hall (SRH) models ubiquitously applied without considering their validity. Herein, advanced technique mapping photoluminescence quantum yield (PLQY) as a function both the excitation pulse energy repetition frequency developed employed examine...

With an aim to understand the behavior in terms of intermolecular interactions, structure and dynamics dicationic monocationic ionic liquids (ILs), two imidazolium-based (DILs), 1,8-bis-(3-methylimidazolium-1-yl)octane bis-(trifluoromethylsulfonyl)amide ([C8(mim)2][NTf2]2), 1,9-bis-(3-methylimidazolium-1-yl)nonane ([C9(mim)2][NTf2]2), one liquid (MIL), 1-butyl-3-methyl imidazolium bis(trifluoromethylsulfonyl)amide ([C4(mim)][NTf2]), have been investigated through combined fluorescence,...

Understanding the relationship between active material's structure and function in operational devices is key for rational engineering of next generation devices. However, this has proven elusive due to invasiveness structural characterization methods their inability penetrate multi-layered device. Here, we introduce a Correlation Clustering Imaging Method (CLIM) based on photoluminescence microscopy. CLIM offers insights into functional aspects related carrier transport, defects,...

With an objective to understand the interaction between inorganic and organic components of inorganic–organic hybrid nanomaterials, we have fabricated studied photonic properties a nanocomposite system consisting silver-capped gold nanoparticle as component J-aggregate cyanine-based dye (S2165) component. The present construct has been by adopting electrostatically driven self-assembly cyanine (AgCAu) nanoparticle. In contrast previously developed systems where fluorescent semiconductor...

The present work has been carried out with the aim to design and develop an efficient light harvesting inorganic-organic hybrid nanoscale material by employing a less toxic, environment friendly inorganic substance also understand mechanism of inter-particle electronic interaction between organic components nanomaterial. Specifically, associate made integrating water soluble semiconductor (zinc-silver-indium-sulfide (ZAIS)) QDs J-aggregates cyanine dye (S2165). fabrication nano-hybrid system...

Despite several studies, convincing explanation for the fluorescence of carbon dots (CDs) and its excitation wavelength dependence behavior has not yet emerged. It may be noted that direct structure–property correlation can misleading based on solely transmission electron microscopy micrographs as it does fully reveal possibility heterogeneous nature samples in a sense having both carbonaceous nanoparticles well small organic molecular-based systems. The present work is undertaken...

Structurally similar but chemically distinguishable solutes provide idea about intermolecular interactions in ionic liquids.

Optical matter, a transient arrangement formed by the interaction of light with micro/nanoscale objects, provides responsive and highly tunable materials that allow for controlling manipulating and/or matter. A combined experimental theoretical exploration optical matter is essential to advance our understanding phenomenon potentially design applications. Most studies have focused on nanoparticles composed single material (either metallic or dielectric), representing two extreme regimes, one...

Abstract The instability of metal halide perovskites limits the commercialization solar cells despite their impressive efficiencies. This instability, driven by photo‐induced ion migration, leads to material restructuring, defect formation, degradation, and healing. However, these same “unwanted” properties enable propose Correlation Clustering Imaging (CLIM), a technique that detects local photoluminescence (PL) fluctuations through wide‐field fluorescence microscopy. It is shown such are...

With an aim to understand the interaction between inorganic and organic components in inorganic–organic hybrid nanostructured materials, we have designed developed nanohybrid associate comprising fluorescent Au nanoclusters (NCs) J-aggregates of a cyanine-based dye (S2165). The present system is quite interesting as contrast previously constructed systems where quantum dots are integrated with dye, using gold nanoparticles J-aggregates. has been characterized by spectroscopic microscopic...

Abstract Photoluminescence (PL) blinking is a common phenomenon in nanostructured semiconductors associated with charge trapping and defect dynamics. PL kinetics exhibit very broadly distributed timescales. The traditionally employed analysis of probability distribution ON OFF events suffers from ambiguities their determination complex traces making its suitability questionable. Here, the statistically correct power spectral density (PSD) estimation method applicable for fluctuations any...