Surface Ligand Modified Cesium Lead Bromide/Silica Spheres Composites for Low-Threshold Up-Conversion Lasing

2022 ◽  
Author(s):  
Qian Xiong ◽  
sihao huang ◽  
Zijun Zhan ◽  
Juan Du ◽  
Xiaosheng Tang ◽  
...  
Keyword(s):  
Silica Spheres ◽  
Lead Bromide ◽  
Surface Ligand ◽  
Low Threshold

scholarly journals Surface ligand modification of cesium lead bromide nanocrystals for improved light-emitting performance

Nanoscale ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 4173-4178 ◽  
Author(s):  
Hua Wu ◽  
Yu Zhang ◽  
Min Lu ◽  
Xiaoyu Zhang ◽  
Chun Sun ◽  
...  
Keyword(s):  
Light Emitting ◽  
Ligand Modification ◽  
Lead Bromide ◽  
Surface Ligand

Ammonium halide facilitated perovskite NC synthesis significantly improves the PLQY and the NC-based light-emitting performances.

High Efficiency Up‐Conversion Random Lasing from Formamidinium Lead Bromide/Amino‐Mediated Silica Spheres Composites

2020 ◽  
Vol 8 (12) ◽  
pp. 2000290 ◽  
Author(s):  
Jie Yang ◽  
Zhengzheng Liu ◽  
Mingyu Pi ◽  
Hao Lin ◽  
Fanju Zeng ◽  
...  
Keyword(s):  
High Efficiency ◽  
Silica Spheres ◽  
Random Lasing ◽  
Lead Bromide

Low threshold open science

2014 ◽  
Author(s):  
Chris H. J. Hartgerink
Keyword(s):  
Open Science ◽  
Low Threshold

Iberis amara L. desensitizes low-threshold mechano-sensitive afferents of the colon

Planta Medica ◽  
2011 ◽  
Vol 77 (12) ◽  
Author(s):  
S Mittler ◽  
MH Müller ◽  
MS Kasparek ◽  
O Kelber ◽  
D Weiser ◽  
...  
Keyword(s):  
Iberis Amara ◽  
Low Threshold

Sans Souci and the Pedagogical Experience

2011 ◽  
Vol 4 (1) ◽  
pp. 93-109 ◽  
Author(s):  
Anne Reinertsen
Keyword(s):  
Critical Thinking ◽  
Student Teachers ◽  
Modern Society ◽  
Modern School ◽  
Low Threshold ◽  
Scientific Competence

This is about the pedagogical experience ahead of or beyond any pedagogical activity or action. It is therefore about perfectibility and/or dealing with something both theoretically and existentially. It is about inclusion and dialogue, but in an indirect manner, and school as a low threshold institution: heterogeneity, pluralism and multiculturalism as the primary characteristics of a modern school in a modern society. This makes school an institution important to life and knowledge. The need for a pedagogy created through a strong scientific orientation through practice or as I prefer; realism, urgent: Pedagogy framed by a good, relevant and strong understanding of context. This makes demands on teachers' competence. It demands more than possessing pedagogical scientific competence. A certain extent of double(d) competence and more is demanded both about what happens in science and about what happens in society and openness always through language and critical thinking or philosophy. This is about becoming teacher in/and for the fractured future and about what we might “give” (student) teachers in addition.

Elucidating the Weakly Reversible Cs-Pb-Br Perovskite Nanocrystal Reaction Network with High-Throughput Maps and Transformations

2020 ◽  
Author(s):  
Jakob Dahl ◽  
Xingzhi Wang ◽  
Xiao Huang ◽  
Emory Chan ◽  
Paul Alivisatos
Keyword(s):  
High Throughput ◽  
Dynamic Equilibrium ◽  
Reaction Network ◽  
Substantial Impact ◽  
Equilibrium Behavior ◽  
Automated Method ◽  
Lead Bromide ◽  
Different Shapes ◽  
Complex Chemistry ◽  
Lead Halide

<p>Advances in automation and data analytics can aid exploration of the complex chemistry of nanoparticles. Lead halide perovskite colloidal nanocrystals provide an interesting proving ground: there are reports of many different phases and transformations, which has made it hard to form a coherent conceptual framework for their controlled formation through traditional methods. In this work, we systematically explore the portion of Cs-Pb-Br synthesis space in which many optically distinguishable species are formed using high-throughput robotic synthesis to understand their formation reactions. We deploy an automated method that allows us to determine the relative amount of absorbance that can be attributed to each species in order to create maps of the synthetic space. These in turn facilitate improved understanding of the interplay between kinetic and thermodynamic factors that underlie which combination of species are likely to be prevalent under a given set of conditions. Based on these maps, we test potential transformation routes between perovskite nanocrystals of different shapes and phases. We find that shape is determined kinetically, but many reactions between different phases show equilibrium behavior. We demonstrate a dynamic equilibrium between complexes, monolayers and nanocrystals of lead bromide, with substantial impact on the reaction outcomes. This allows us to construct a chemical reaction network that qualitatively explains our results as well as previous reports and can serve as a guide for those seeking to prepare a particular composition and shape. </p>

Hollow Metal Halide Perovskite Nanocrystals with Efficient Blue Emissions

2019 ◽  
Author(s):  
Michael Worku ◽  
Yu Tian ◽  
Chenkun Zhou ◽  
Haoran Lin ◽  
Maya Chaaban ◽  
...  
Keyword(s):  
Precursor Solution ◽  
Visible Spectral Region ◽  
Metal Halide ◽  
Synthetic Control ◽  
Perovskite Nanocrystals ◽  
Highly Efficient ◽  
Quantum Confinement Effects ◽  
Metal Halide Perovskite ◽  
Lead Bromide ◽  
Halide Perovskite

Metal halide perovskite nanocrystals (NCs) have emerged as a new generation light emitting materials with narrow emissions and high photoluminescence quantum efficiencies (PLQEs). Various types of perovskite NCs, e.g. platelets, wires, and cubes, have been discovered to exhibit tunable emissions across the whole visible spectral region. Despite remarkable advances in the field of metal halide perovskite NCs over the last few years, many nanostructures in inorganic NCs have yet been realized in metal halide perovskites and producing highly efficient blue emitting perovskite NCs remains challenging and of great interest. Here we report for the first time the discovery of highly efficient blue emitting cesium lead bromide perovskite (CsPbBr3) NCs with hollow structures. By facile solution processing of cesium lead bromide perovskite precursor solution containing additional ethylenediammonium bromide and sodium bromide, in-situ formation of hollow CsPbBr3 NCs with controlled particle and pore sizes is realized. Synthetic control of hollow nanostructures with quantum confinement effects results in color tuning of CsPbBr3 NCs from green to blue with high PLQEs of up to 81 %.<br><div><br></div>

Sign in / Sign up

Export Citation Format

Share Document