A5102872483- Perovskite Materials and Applications
- Luminescence Properties of Advanced Materials
- Quantum Dots Synthesis And Properties
- Combustion and flame dynamics
- Organic Light-Emitting Diodes Research
- Advanced Combustion Engine Technologies
- Luminescence and Fluorescent Materials
- Multiferroics and related materials
- Combustion and Detonation Processes
- Ferroelectric and Piezoelectric Materials
- Conducting polymers and applications
- Chalcogenide Semiconductor Thin Films
- Solid-state spectroscopy and crystallography
- Computational Fluid Dynamics and Aerodynamics
- Rocket and propulsion systems research
- Gas Dynamics and Kinetic Theory
- Nanoplatforms for cancer theranostics
- Optical properties and cooling technologies in crystalline materials
- Fluid Dynamics and Turbulent Flows
- 2D Materials and Applications
- Dielectric properties of ceramics
- Heat transfer and supercritical fluids
- Wind and Air Flow Studies
- Fire dynamics and safety research
- Advanced Aircraft Design and Technologies
City University of Hong Kong
2022-2025
City University of Hong Kong, Shenzhen Research Institute
2022-2024
Shenyang Aerospace University
2018-2024
Shanghai Jiao Tong University
2018-2023
University of Maryland, College Park
2017
Beihang University
2012-2016
Tongji University
2015-2016
Abstract Achieving good stability while maintaining excellent properties is one of the main challenges for enhancing competitiveness luminescent perovskite CsPbX 3 (X=Cl, Br, I) nanocrystals (NCs). Here, we propose a facile strategy to synthesize ceramic-like stable and highly CsPbBr NCs by encapsulating them into silica derived from molecular sieve templates at high temperature (600–900 o C). The obtained -SiO 2 powders not only show photoluminescence quantum yield (~71%), but also an...
Light-emitting diodes based on perovskite nanocrystals (PNCs-LEDs) have gained great interest for next-generation display and lighting technologies prized their color purity, high brightness, luminous efficiency which approach the intrinsic limit imposed by light extraction from device structure. Although time is ripe development of effective outcoupling strategies to further boost performance, this technologically relevant aspect PNC-LEDs still without a definitive solution. Here, following...
Abstract Wearable displays require mechanical deformability to conform the skin, as well long-term stability, multicolour emission and sufficient brightness enable practically useful applications. However, endowing a single device with all features remains challenge. Here we present rational material design strategy simple device-manufacturing process for skin-conformable perovskite-based alternating-current electroluminescent (PeACEL) devices. These devices exhibit narrow bandwidth...
Multicolor tuning of persistent luminescence has been extensively studied by deliberately integrating various luminescent units, known as activators or chromophores, into certain host compounds. However, it remains a formidable challenge to fine-tune the spectra either in organic materials, such small molecules, polymers, metal-organic complexes and carbon dots, doped inorganic crystals. Herein, we present strategy delicately control wavelength engineering sub-bandgap donor-acceptor states...
CsPbCl3 nanocrystals are potential ultrapure emitters. But it is challenging to synthesize with sufficient stability, which impedes their application in light-emitting devices. In this work, we report a facile phosphoryl-chemistry-mediated synthesis approach synthesizing stable nanocrystals, the phenylphosphonic dichloride (PhPOCl2) precursor employed. addition high reactivity of P–Cl bond PhPOCl2 for providing adequate Cl, derived P=O good proton affinity facilitates formation distinct...
Hydrochromic materials characterized by noticeable color change upon water exposure have attracted pervasive attention for their frontier applications in sensing and information technologies. However, existing hydrochromic typically suffer from a slow response as well limited stability tunability. This work describes novel perovskite crystal composed of zero-dimensional Cs3TbF6:Eu3+, which displays switchable luminescence due to the constituent Tb3+ Eu3+ ions. Mechanistic investigation...
Sn-based perovskites are the most promising alternative materials for Pb-based to address toxicity problem of lead. However, development SnII -based has been hindered by their extreme instability. Here, we synthesized efficient and stable lead-free Cs4 SnBr6 perovskite using SnF2 as tin source instead easily oxidized SnBr2 . The configures a fluorine-rich environment, which can not only suppress oxidation Sn2+ in synthesis, but also construct chemically Sn-F coordination hinder electron...
Abstract Luminescent materials that display quick spectral responses to thermal stimuli have attracted pervasive attention in sensing technologies. Herein, a programmable luminescence color switching lanthanide‐doped LiYO 2 under stimuli, based on deliberate control of the monoclinic ( β ) tetragonal α phase transition crystal lattice, is reported. Specifically, lanthanide‐doping (Ln 3+ approach fine‐tune phase‐transition temperature wide range from 294 359 K developed. Accordingly, an array...
Recently, two-dimensional colloidal perovskite nanoplatelets (NPLs) have attracted great attention as one of the most promising candidate blue emitters due to their large exciton binding energy and precisely tunable thickness. However, lack techniques simultaneously obtain highly emissive stable NPLs has limited successful exploitation efficient NPL-based optoelectronic devices. Herein, we report surface ligand-engineering strategy enhance photoluminescence quantum yields stability using a...
Perovskite nanocrystals (NCs) as promising narrow green emitters are widely studied, and many colloidal synthetic methods have been developed. However, large amounts of expensive toxic organic solvents consumed in synthesis. Herein, a high temperature solid-state confined growth strategy was developed to prepare highly emissive CsPbBr3 NCs using the situ formed mesoporous Al2O3 template. The obtained CsPbBr3–Al2O3 powders possessed quantum yield up 70%, emission line width 25 nm, outstanding...
Abstract For the display applications of perovskite nanocrystals (NCs), photoluminescence quantum yield (PLQY), emission linewidth, and operational stability are main parameters that directly affect performance optoelectronic device. High‐temperature solid‐state synthesis has been regarded as an eco‐friendlier process to prepare NCs than colloidal synthesis. However, it is relatively difficult control sizes size distribution at high temperatures, which usually results in a lower PLQY wider...
For next-generation high-definition displays, the newly recommendation 2020 (Rec. 2020) standard calls for emission wavelength of green emitters to be kept at 525–535 nm with narrow line width below 25 nm. All-inorganic lead halide perovskite CsPbBr3 nanocrystals (NCs) sharp seem as prefect one match call, however, it is a great challenge tune their target window because intrinsic band gap CsPbBr3. Herein, we report facile strategy prepare NCs finely tunable emissions in range by...
Lead halide perovskite nanocrystals as promising ultrapure emitters are outstanding candidates for next-generation light-emitting diodes (LEDs) and display applications, but the thermal quenching behavior of light emission has severely hampered their real-world applications. Here, we report an anion passivation strategy to suppress CsPbBr3 nanocrystals. By treating with specific anions (such SO42-, OH-, F- ions), corresponding wide-bandgap layers, PbSO4, Pb(OH)2, PbF2, were obtained. They...
Abstract Persistent luminescence (PersL), characterized by continuous light emission after cessation of excitation, finds enormous applications in night displays, optoelectronics, and biomedicine. Despite the long history a recent renaissance PersL research, there still lacks versatile approach for deliberate control over single material system, which is crucial mechanistic understanding rational design PersL. Herein, strategy systematic tuning wavelength, time, temperature domains wurtzite...
The thermal quenching behavior (temperature-dependent luminescence) has severely hindered the practical applications of CsPbX3 nanocrystals. Here, we find that a simple surface treatment using ammonium hexafluorosilicate (AHFS, (NH4)2SiF6) can drastically reduce CsPbBr3 nanocrystals (CPB-NCs) while enhancing their photostability. AHFS-treated sample sustains 90% its original emission intensity as temperature rises to 353 K, which is much better than (17%) pristine sample. Meanwhile,...
Perovskite nanocrystals (NCs) have gained great interest for next-generation light-emitting diodes (LEDs) prized their spectrally tunable, narrow luminescence and defect-tolerant electronic structure. Here, we provide a careful surface engineering to balance the passivation charge injection by controlling ligand density of didodecyl dimethyl ammonium bromide on NCs, which not only offers an improved photoluminescence quantum yield >70% NCs but also guarantees effective transportation CsPbBr3...
Abstract Ultraviolet (UV) radiation offers many exciting biomedical applications such as biosensing and cancer therapy. Photon upconversion through lanthanide (Ln)‐doped nanoparticles is an attractive approach for UV generation by excitation of near‐infrared (NIR) light, which readily accessible highly penetrating in tissue environments. By rationally engineering the emission property (UCNPs) coupled with surface functionalization photoactivatable molecules, various nanosystems can be...