A5051904484- Perovskite Materials and Applications
- Conducting polymers and applications
- Quantum Dots Synthesis And Properties
- Organic Electronics and Photovoltaics
- Organic Light-Emitting Diodes Research
- Chalcogenide Semiconductor Thin Films
- Advanced Chemical Physics Studies
- 2D Materials and Applications
- Luminescence and Fluorescent Materials
- Spectroscopy and Quantum Chemical Studies
- Advanced Photocatalysis Techniques
- Photochemistry and Electron Transfer Studies
- Laser-Matter Interactions and Applications
- Covalent Organic Framework Applications
- Mass Spectrometry Techniques and Applications
- Thin-Film Transistor Technologies
- Solid-state spectroscopy and crystallography
- Nanocluster Synthesis and Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Graphene research and applications
- Carbon and Quantum Dots Applications
- Silicon Carbide Semiconductor Technologies
- Optical properties and cooling technologies in crystalline materials
Henan Normal University
2015-2025
Wuhan University of Technology
2024
Xinjiang University
2024
Xinxiang Medical University
2023
Beihang University
2022
Hengyang Normal University
2022
Xinxiang University
2019-2021
Henan University
2021
Wuhan Institute of Physics and Mathematics
2010-2014
Chinese Academy of Sciences
2010-2014
Device performance and in particular device stability for blue perovskite light-emitting diodes (PeLEDs) remain considerable challenges the whole community. In this manuscript, we conceive an approach by tuning 'A-site' cation composition of perovskites to develop blue-emitters. We herein report a Rubidium-Cesium alloyed, quasi-two-dimensional demonstrate its great potential pure-blue PeLED applications. Composition engineering in-situ passivation are conducted further improve material's...
Abstract Rapid Auger recombination represents an important challenge faced by quasi-2D perovskites, which induces resulting perovskite light-emitting diodes’ (PeLEDs) efficiency roll-off. In principle, rate is proportional to materials’ exciton binding energy ( E b ). Thus, can be suppressed reducing the corresponding . Here, a polar molecule, p -fluorophenethylammonium, employed generate perovskites with reduced Recombination kinetics reveal does decrease one-order-of magnitude lower...
Abstract Surface manipulation of quantum dots (QDs) has been extensively reported to be crucial their performance when applied into optoelectronic devices, especially for photovoltaic devices. In this work, an efficient surface passivation method emerging CsPbI 3 perovskite QDs using a variety inorganic cesium salts (cesium acetate (CsAc), idodide (CsI), carbonate (Cs 2 CO ), and nitrate (CsNO )) is reported. The Cs‐salts post‐treatment can not only fill the vacancy at but also improve...
Abstract Reduced-dimensional (quasi-2D) perovskite materials are widely applied for photovoltaics due to their remarkable environmental stability. However, device performance still lags far behind traditional three dimensional perovskites, particularly high open circuit voltage ( V oc ) loss. Here, inhomogeneous energy landscape is pointed out be the sole reason, which introduces extra loss, creates band tail states and inhibits minority carrier transport. We thus propose form homogeneous...
Serious performance decline arose for perovskite light-emitting diodes (PeLEDs) once the active area was enlarged. Here we investigate failure mechanism of widespread film fabrication method; and ascribe severe phase-segregation to be reason. We thereby introduce L-Norvaline construct a COO
Great successes have been achieved in developing perovskite light-emitting devices (LEDs) with blue, green, red, and near-infrared emissions. However, as key optoelectronic devices, yellow-colored LEDs remain challenging, mainly due to the inevitable halide separation mixed perovskites under high bias, causing undesired color change of devices. In addition this color-missing problem, intrinsic toxicity poor stability conventional lead-halide also restrict their practical applications. We...
Chiral quasi-2D perovskite single crystals (SCs) were investigated for their circular polarized light (CPL) detecting capability. Quasi-2D chiral perovskites, [(R)-β-MPA]2 MAPb2 I7 ((R)-β-MPA=(R)-(+)-β-methylphenethylamine, MA=methylammonium), have intrinsic chirality and the capability to distinguish different polarization states of CPL photons. Corresponding SCs photodetector exhibit excellent detection performance. In particular, our device responsivity is almost one order magnitude...
We developed lead halide perovskite quantum dot (QD) solar cells with a combinational absorbing layer based on stacked α-CsPbI3 and FAPbI3. QDs, relatively wide bandgap of 1.75 eV, are not ideal for single-junction cells. show that the absorption can be broadened by introduction another QD narrower like The α-CsPbI3/FAPbI3 structure together thermal annealing improve electrical coupling in FAPbI3 induce A-site cation exchange to develop graded heterojunction more efficient charge extraction....
Abstract Covalent organic frameworks (COFs) as appealing platforms have received tremendous interest in the field of photocatalytic H 2 evolution owing to their well‐defined structures and tailor‐made function. However, excitonic effects resulting from Coulomb interactions between electron–hole pairs are key rate‐determining processes hydrogen evolution, which usually ignored. Thus, it is profound significance highly desired, but still a challenge, explore new routes modulate dissociation...
Quasi-2D perovskites, composed of self-organized quantum well structures, are emerging as gain materials for laser applications. Here we investigate the influence domain distribution on emission CsPbCl1.5Br1.5-based quasi-2D perovskites. The use 2,2-diphenylethylammonium bromide (DPEABr) a ligand enables formation film with large-n-dominated narrow distribution. Due to reduced content small-n domains, incomplete energy transfer from large-n domains can be greatly addressed. Moreover,...
Abstract Covalent triazine frameworks (CTF) offer a tunable platform for photocatalytic H 2 generation due to their diverse structures, low costs, and precisely electronic structures. However, high exciton binding energy short lifetimes of photogenerated carriers restrict application in hydrogen evolution. Herein, novel phosphorus‐incorporated CTF is introduced construct chemically bonded PCTF/WO 3 (PCTFW) heterostructure with precise interface electron transfer channel. The phosphorus...
Direct photocatalytic hydrogen and oxygen evolution from water splitting is an attractive approach for producing chemical fuels. In this work, a novel fluorenone-based covalent organic framework (COF-SCAU-2) successfully exfoliated into ultrathin three-layer nanosheets (UCOF-SCAU-2) overall (OWS) under visible light. The structures of UCOF-SCAU-2 greatly enhance carrier separation, utilization efficiency, the exposure active surface sites. Surprisingly, exhibits efficient OWS performance,...
Mixed-halide perovskites are considered the most straightforward candidate to realize blue perovskite light-emitting diodes (PeLEDs). However, they suffer severe halide migration, leading spectral instability, which is particularly exaggerated in high chloride alloying perovskites. Here, we demonstrate energy barrier of migration can be tuned by manipulating degree local lattice distortion (LLD). Enlarging LLD a suitable level increase barrier. We herein report an "A-site" cation engineering...
Abstract Since the emergence of inorganic–organic hybrid perovskites a few years ago, there have been many promising achievements in field green and red perovskite light‐emitting diodes (PeLEDs). Nevertheless, performance blue‐light PeLEDs faces challenges. In this work, unique synergy obtained by introducing two different ligands to successfully form quasi‐2D films, which can exhibit stable emission, is utilized. The fabricated maximum external quantum efficiency 2.62% half lifetime ( T 50...
Low-dimensional metal halides (LDMHs), especially lead-based perovskites, have recently attracted a great deal of attention for their unique structures and optoelectronic properties. However, the toxicity lead limits practical applications. Herein, lead-free one-dimensional copper-based halide [KC2]2[Cu4I6] (C = 12-crown-4 ether) was constructed, which exhibits greenish-yellow emission (545 nm) with near-unity photoluminescence quantum yield (∼97.8%). To best our knowledge, this is highest...
Abstract 2D Ruddlesden–Popper perovskites (RPPs) have recently drawn significant attention because of their structural variability that can be used to tailor optoelectronic properties and improve the stability derived photovoltaic devices. However, charge separation transport in perovskite solar cells (PSCs) suffer from quantum well barriers formed during processing perovskites. It is extremely difficult manage phase distributions made stoichiometric mixtures precursor solutions. Herein, a...
The mechanism of single-mode lasing in CsPbBr<sub>3</sub> microsphere shifts from exciton–exciton scattering to exciton–phonon with the increase temperature 77 300 K, and two different phonon modes were involved process.
Abstract Chiral quasi‐2D perovskite single crystals (SCs) were investigated for their circular polarized light (CPL) detecting capability. Quasi‐2D chiral perovskites, [( R )‐β‐MPA] 2 MAPb I 7 (( )‐β‐MPA=( )‐(+)‐β‐methylphenethylamine, MA=methylammonium), have intrinsic chirality and the capability to distinguish different polarization states of CPL photons. Corresponding SCs photodetector exhibit excellent detection performance. In particular, our device responsivity is almost one order...
A record power conversion efficiency of 20.1% is achieved for quasi-2D Ruddlesden–Popper perovskite solar cells. The quantum wells are reversely graded in the film, and confinement effect inside film significantly weakened.
A surface treatment of PEDOT:PSS layer with [PNA]BF 4 is employed to realize vertically homogeneous distribution Sn/Pb-containing perovskite films through balancing its crystallization rate and achieving chemical encapsulation the acidic substrate.
Photocatalytic hydrogen production is a promising technology to alleviate the problems of energy shortage and environmental pollution faced by human society. In this paper, S-scheme heterojunction TiO2/g-C3N4 was modified Ti3C2 quantum dots (QDs) prepare three-dimensional/two-dimensional/zero-dimensional (3D/2D/0D) photocatalyst for photocatalytic production. The structure reduces recombination rate photogenerated electron–hole pairs produces more electrons. At same time, as electron...
Flexible perovskite solar cells (FPSCs) represent a promising technology in the development of next-generation photovoltaic and optoelectronic devices. SnO2 electron transport layers (ETL) typically undergo significant cracking during bending process FPSCs, which can significantly compromise their charge properties. Herein, semi-planar non-fullerene acceptor molecule Y6 (BT-core-based fused-unit dithienothiophen [3,2-b]-pyrrolobenzothiadiazole derivative) is introduced as buffer layer for...
Abstract Carbon nanodots (CDs) have emerged as an alternative option for traditional nanocrystals due to their excellent optical properties and low toxicity. Nevertheless, high emission efficiency is a long‐lasting pursuit CDs. Herein, CDs with near‐unity are prepared via atomic condensation of doped pyrrolic nitrogen, which can highly localize the excited states thus lead formation bound excitons symmetry break π –electron conjugation. The short radiative lifetimes (<8 ns) diffusion...