Effect of Structure Change on Luminescent Properties of CsPbBr2I Perovskite Nanocrystals after Heat Treatment

2019 ◽  
Vol 72 (9) ◽  
pp. 663
Author(s):  
Ji Li ◽  
Li Wang ◽  
Xin Gao
Keyword(s):  
Quantum Confinement ◽  
Annealing Temperature ◽  
Luminescent Properties ◽  
Blue Shift ◽  
Exchange Reactions ◽  
Perovskite Nanocrystals ◽  
Average Grain Size ◽  
Halide Perovskites ◽  
Popular Subject ◽  
Lead Halide

Lead halide perovskite nanocrystals (NCs) are still a popular subject in the field of luminescence because of their high photoluminescence quantum yield (PLQY) and colour tenability through anion exchange reactions or quantum confinement. We investigated the structure and luminescence properties of the mixed halide perovskites CsPbBr2I NCs with annealing temperatures. The results showed that the average grain size of CsPbBr2I increased with increasing the temperature from 300 to 440K, and the morphology changed above 380K. The normalised PL spectra of CsPbBr2I NCs had an obvious blue-shift, and then displayed a slight red-shift with increasing annealing temperature. In addition, the PL intensities, peak energies, and bandwidths of the NC films as a function of temperature were discussed in detail.

scholarly journals Morphological and Optical Tuning of Lead-Free Cs2SnX6 (X = I, Br) Perovskite Nanocrystals by Ligand Engineering

2021 ◽  
Vol 2 ◽  
Author(s):  
Alessandro Veronese ◽  
Carlo Ciarrocchi ◽  
Marcello Marelli ◽  
Paolo Quadrelli ◽  
Maddalena Patrini ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Blue Shift ◽  
Carbon Chain ◽  
Lead Free ◽  
Future Research ◽  
Promising Alternative ◽  
Perovskite Nanocrystals ◽  
Halide Perovskites ◽  
Capping Ligands ◽  
Lead Halide

In order to overcome the toxicity of lead halide perovskites, in recent years the research has focused on replacing lead with more environmentally friendly metals like tin, germanium, bismuth or antimony. However, lead-free perovskites still present instability issues and low performances that do not make them competitive when compared to their lead-based counterparts. Here we report the synthesis of lead-free Cs2SnX6 (X = Br, I) nanostructures of different shapes by using various surface ligands. These compounds are a promising alternative to lead halide perovskites in which the replacement of divalent lead (Pb(II)) with tetravalent tin (Sn(IV)) causes a modification of the standard perovskite structure. We investigate the effects of different amines on the morphology and size of Cs2SnX6 (X = Br, I) nanocrystals, presenting a facile hot-infection method to directly synthesize three-dimensional (3D) nanoparticles as well as two-dimensional (2D) nanoplatelets. The amines not only modify the shape of the crystals, but also affect their optical properties: increasing the length of the amine carbon chain we observe a widening in the bandgap of the compounds and a blue-shift of their emission peak. Alongside the tuning of the chemical composition and the reduction of the crystal size, our study offers a new insight in controlling the physical properties of perovskite nanocrystals by means of the capping ligands, paving the way for future research on lead-free materials.

Tuning the emission spectrum of highly stable cesium lead halide perovskite nanocrystals through poly(lactic acid)-assisted anion-exchange reactions

2018 ◽  
Vol 6 (20) ◽  
pp. 5375-5383 ◽  
Author(s):  
Longshi Rao ◽  
Yong Tang ◽  
Caiman Yan ◽  
Jiasheng Li ◽  
Guisheng Zhong ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Emission Spectrum ◽  
Anion Exchange ◽  
Poly Lactic Acid ◽  
Exchange Reactions ◽  
Perovskite Nanocrystals ◽  
Stable Cesium ◽  
Halide Perovskite ◽  
Lead Halide

Emission tunable CsPbX3 NCs with high QY and stability were synthesized via PLA-assisted anion-exchange reactions.

Confining perovskite quantum dots in pores of covalent organic framework: quantum confinement- and passivation-enhanced light-harvesting and photocatalysis

2021 ◽  
Author(s):  
Genping Meng ◽  
Liping Zhen ◽  
Shihao Sun ◽  
Jun Hai ◽  
Zefan Zhang ◽  
...  
Keyword(s):  
Quantum Confinement ◽  
Light Harvesting ◽  
High Light ◽  
Artificial Light ◽  
Absorption Coefficients ◽  
Harvesting Systems ◽  
Perovskite Quantum Dots ◽  
Halide Perovskites ◽  
Lead Halide ◽  
Significant Attention

All-inorganic lead halide perovskites have attracted significant attention in artificial light-harvesting systems (ALHSs) due to their superior emission tunability and high light-absorption coefficients. However, their relatively low photoluminescence quantum yield...

Investigation of Emission Behaviour of Perovskite Nanocrystals into TiO2 Nano to Microsphere

2021 ◽  
Author(s):  
Abha Jha ◽  
Hari Shankar ◽  
Prasenjit Kar
Keyword(s):  
Optoelectronic Devices ◽  
Promising Material ◽  
Perovskite Nanocrystals ◽  
Term Stability ◽  
Long Term Stability ◽  
Halide Perovskites ◽  
Lead Halide

Organic-inorganic methylammonium lead halide perovskites nanocrystals have emerged as a promising material for optoelectronic devices. But due to the lack of long-term stability of perovskite nanocrystals, its applications have been...

scholarly journals PTFE-based microreactor system for the continuous synthesis of full-visible-spectrum emitting cesium lead halide perovskite nanocrystals

2017 ◽  
Vol 8 ◽  
pp. 2521-2529 ◽  
Author(s):  
Chengxi Zhang ◽  
Weiling Luan ◽  
Yuhang Yin ◽  
Fuqian Yang
Keyword(s):  
Optical Gain ◽  
Visible Spectrum ◽  
Blue Shift ◽  
Photoluminescence Emission ◽  
Perovskite Nanocrystals ◽  
Luminescence Efficiency ◽  
High Fluorescence ◽  
Lead Halide ◽  
Slight Blue Shift ◽  
Unique Capability

Colloidal perovskite nanocrystals comprised of all inorganic cesium lead halide (CsPbX3, X = Cl, Br, I or a mixture thereof) have potential as optical gain materials due to their high luminescence efficiency. In this work, cesium lead halide nanocrystals are continuously synthesized via a microreactor system consisting of poly(tetrafluoroethylene) (PTFE) capillaries. The synthesized nanocrystals possess excellent optical properties, including a full width at half maximum of 19–35 nm, high fluorescence quantum yield of 47.8–90.55%, and photoluminescence emission in the range of 450–700 nm. For the same precursor concentrations, the photoluminescence emission peak generally increases with increasing reaction temperature, revealing a controllable temperature effect on the photoluminescence characteristics of the synthesized nanocrystals. For quantum dots synthesized with a Br/I ratio of 1:3, a slight blue shift was observed for reaction temperatures greater than 100 °C. This PTFE-based microreactor system provides the unique capability of continuously synthesizing high-quality perovskite nanocrystals that emit over the full visible spectrum with applications ranging from displays and optoelectronic devices.

Phonon mode transformation in size-evolved solution-processed inorganic lead halide perovskite

Nanoscale ◽  
2018 ◽  
Vol 10 (21) ◽  
pp. 9892-9898 ◽  
Author(s):  
Huafeng Shi ◽  
Xiaoli Zhang ◽  
Xiaowei Sun ◽  
Xinhai Zhang
Keyword(s):  
Particle Size ◽  
Phonon Mode ◽  
Optoelectronic Materials ◽  
Solution Processed ◽  
Perovskite Nanocrystals ◽  
Mode Transformation ◽  
Inorganic Lead ◽  
Halide Perovskites ◽  
Halide Perovskite ◽  
Lead Halide

Lead halide perovskites have been very hot and new optoelectronic materials in recent years. This study found fundamental phonon mode transformation during the increase in particle size of perovskite nanocrystals.

scholarly journals Tuning the Optical Properties of Cesium Lead Halide Perovskite Nanocrystals by Anion Exchange Reactions

2015 ◽  
Vol 137 (32) ◽  
pp. 10276-10281 ◽  
Author(s):  
Quinten A. Akkerman ◽  
Valerio D’Innocenzo ◽  
Sara Accornero ◽  
Alice Scarpellini ◽  
Annamaria Petrozza ◽  
...  
Keyword(s):  
Optical Properties ◽  
Anion Exchange ◽  
Exchange Reactions ◽  
Perovskite Nanocrystals ◽  
Halide Perovskite ◽  
Lead Halide
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