A5084785208- Organic Light-Emitting Diodes Research
- Perovskite Materials and Applications
- Luminescence and Fluorescent Materials
- Molecular Junctions and Nanostructures
- Enhanced Oil Recovery Techniques
- Organic Electronics and Photovoltaics
- Pickering emulsions and particle stabilization
- Conducting polymers and applications
- Green IT and Sustainability
- Luminescence Properties of Advanced Materials
- 2D Materials and Applications
- Orbital Angular Momentum in Optics
- Quantum optics and atomic interactions
- Cold Atom Physics and Bose-Einstein Condensates
- Petroleum Processing and Analysis
- Quantum Dots Synthesis And Properties
- Surfactants and Colloidal Systems
- Hydrocarbon exploration and reservoir analysis
- Molecular Sensors and Ion Detection
- Optical properties and cooling technologies in crystalline materials
- Knee injuries and reconstruction techniques
- Photochemistry and Electron Transfer Studies
- Catalytic Cross-Coupling Reactions
- Aerosol Filtration and Electrostatic Precipitation
- Analytical Chemistry and Sensors
Purdue University West Lafayette
2023-2024
University of Michigan–Ann Arbor
2019-2024
China University of Petroleum, Beijing
2022-2024
BioSurfaces (United States)
2020
Changzhou University
2019
Beijing University of Chemical Technology
2015
ConspectusMetal-free purely organic phosphors (POPs) are promising materials for display technologies, solid-state lighting, and sensors platforms because of their advantageous properties such as large design windows, easy processability, economic material cost. Unlike inorganic semiconductors, creating the conditions triplet excitons to produce light in is a demanding task presence electron spin configurations that undergo spin-forbidden transitions, which usually facilitated by spin-orbit...
Layered metal-halide perovskites, or two-dimensional can be synthesized in solution, and their optical electronic properties tuned by changing composition. We report a molecular templating method that restricted crystal growth along all crystallographic directions except for [110] promoted one-dimensional growth. Our approach is widely applicable to synthesize range of high-quality layered perovskite nanowires with large aspect ratios tunable organic-inorganic chemical compositions. These...
Room-temperature phosphorescence from metal-free purely organic molecules has recently gained much interest. We devised phosphors by incorporating selenium (Se) to promote spin–orbit coupling its nonmetal heavy atom effect. The Se-based showed bright phosphorescent emission in light-emitting diodes (OLEDs) and photo-excited an amorphous film state. Large orbital angular momentum change (ΔL) during the electron transition process effect of Se render a PL quantum yield 0.33 ± 0.01 high...
The key factors determining the emission bandwidth of thermally activated delayed fluorescence (TADF) are investigated by combining computational and experimental approaches. To achieve high internal quantum efficiencies in a metal-free organic light-emitting diode via TADF, first triplet (T1) to singlet (S1) reverse intersystem crossing is promoted configuring molecules an electron donor–acceptor (D-A) alternation with large dihedral angle, which results small energy gap (ΔEST) between S1...
Abstract Metal‐free organic triplet emitters are an emerging class of semiconducting material. Among them, molecules with tunable emission responsive to environmental stimuli have shown great potential in solid‐state lighting, sensors, and anti‐counterfeiting systems. Here, a novel excited‐state intramolecular proton transfer (ESIPT) system is proposed showing the activation thermally activated delayed fluorescence (TADF) or room‐temperature phosphorescence (RTP) simultaneously from both...
Background: Nearly three-quarters of anterior cruciate ligament (ACL) injuries occur as “noncontact” failures from routine athletic maneuvers. Recent in vitro studies revealed that repetitive strenuous submaximal knee loading known to especially strain the ACL can lead its fatigue failure, often at femoral enthesis. Hypothesis: failure be caused by accumulated tissue damage: specifically, chemical and structural evidence this process will found enthesis ACLs tested cadaveric knees, well...
Metal-free organic phosphorescent materials are promising alternatives to the organometallic counterparts predominantly adopted in light-emitting diodes due their low cost, chemical stability, and large molecular design window. However, only a few reports on OLED devices incorporating metal-free phosphors have been presented lack of understanding material properties, device physics, fabrication processes. Here, we report tailor-designed novel fluorene-based phosphor with efficient spin-orbit...
Abstract A new type of luminescence switching behavior based on phosphorescence enhancement from a series metal‐free organic phosphors doped polymers by UV‐irradiation is investigated. This phenomenon observed only pairs and polymer matrices having combination appropriate triplet exciton lifetime oxygen permeability. Systematic investigation reveals that the embedded in specific polymeric matrix stems conversion oxygens to singlet UV‐irradiation, leading unique phosphors. Visualization...
A new design concept for metal-free organic phosphors is proposed to tightly couple the heavy atom effect with changes in orbital angular momentum. Bright were created record-fast lifetimes below millisecond regime.
The CO2-responsive Pickering emulsions employed have garnered considerable attention across enhanced oil recovery agents, delivery of crude, and oilfield-produced fluid treatment. This study focuses on the design an innovative type Janus nanoparticle (JNP) its application in construction CO2 stimuli-responsive emulsions. emulsion stabilized by JNPs demonstrates swift phase separation subsequent to injection CO2. Furthermore, mechanism CO2-stimulated responsiveness enabled was proposed. Based...
By pyrolyzing cattle bones, hierarchical porous carbon (HPC) networks with a high surface area (2520 m(2) g(-1) ) and connected pores were prepared at low cost large scale. Subsequent co-pyrolysis of HPC vitamin B12 resulted in the formation three-dimensional (3D) hierarchically structured cobalt-nitrogen-carbon (Co-N-HPC) electrocatalysts as 859 well higher oxygen reduction reaction (ORR) electrocatalytic activity, better operation stability, tolerance to methanol than commercial Pt/C...
A new mixed-lanthanide porphyrin complex with balanced phosphorescence and fluorescence was engineered for O 2 detection. Characterization revealed the photophysical mechanism of unique dual luminescence properties.
Inadequate strength and stability of active crude oil emulsions stabilized by conventional surfactants always lead to a limited plugging rate agents. Thus, address this issue, the synthesis amphiphilic Janus nanosheets was effectively carried out for enhancing system performances subsequently characterized. Based on outcomes orthogonal tests, an assessment conducted nanosheet surfactant formulations optimize enhancement emulsion properties. The experimental demonstration complex has revealed...
To construct the in-situ emulsification and viscosification system that is suitable for low permeability oil reservoirs characterized by high-temperature high-salt, amphiphilic Janus SiO2 nanoparticles Tween 60/Imidazoline oleate surfactant were combined. The mechanism of was elucidated from two aspects: dynamic adsorption phase conversion surfactant, unique bridge structure nanoparticle stabilized emulsion. successful synthesis with varying degrees hydrophilicity hydrophobicity achieved...
Nanotechnology has been increasingly applied in the petroleum industry recent years. In particular, dispersions consisting of nanoparticles and surfactants have widely investigated. The imbibition system compounded by nanoparticle surfactant was found to display a high efficiency enhancing oil recovery. This paper briefly reviews factors influencing efficiency. At same time, application mechanism nanoparticle-surfactant dispersion field enhanced recovery are introduced. Additionally,...
Aromatic organic molecules are widely used as passivators in perovskite solar cells (PSCs). Efforts have been devoted to improving the energy alignments, band edge states, and defect passivation functionalities. However, potential loss through triplet states such conjugated has not investigated past. Here, we report observation of charge transfer from FAPbI3 state a pyrene (Pyr)-based cationic ligand. Such channel can be suppressed via delicate management polycyclic aromatic compounds....
Polarity-induced room-temperature dual phosphorescence involving the T 2 state of purely organic phosphors.
Abstract Metal halide perovskites show promise for next-generation light-emitting diodes, particularly in the near-infrared range, where they outperform organic and quantum-dot counterparts. However, still fall short of costly III-V semiconductor devices, which achieve external quantum efficiencies above 30% with high brightness. Among several factors, controlling grain growth nanoscale morphology is crucial further enhancing device performance. This study presents a engineering methodology...