A5062958150- Luminescence and Fluorescent Materials
- Luminescence Properties of Advanced Materials
- Quantum Dots Synthesis And Properties
- Lanthanide and Transition Metal Complexes
- Perovskite Materials and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Metamaterials and Metasurfaces Applications
- Nonlinear Optical Materials Studies
- Nanocluster Synthesis and Applications
- Advanced NMR Techniques and Applications
- Nanoplatforms for cancer theranostics
- Advanced MRI Techniques and Applications
- Plasmonic and Surface Plasmon Research
- Electron Spin Resonance Studies
University of Utah
2022-2025
University of California, Riverside
2020-2022
Tokyo University of Science
2020
Circularly polarized light (CPL) is a versatile tool to prepare chiral nanostructures, but the mechanism for inducing enantioselectivity not well understood. This work shows that energy and polarization of visible photons can initiate photodeposition at different sites on plasmonic nanocrystals. Here, CPL achiral gold bipyramids (AuBPs) creates hot holes oxidatively deposit PbO2 asymmetrically. We show first time location hence optical dissymmetry depends wavelength. Specifically, 488 532 nm...
Photon upconversion is a process that combines low-energy photons to form useful high-energy photons. There are potential applications in photovoltaics, photocatalysis, biological imaging, etc. Semiconductor quantum dots (QDs) promising for the absorption of these due high extinction coefficient QDs, especially near infrared (NIR). This allows intriguing use diffuse light sources such as solar irradiation. In this review, we describe development organic-QD platform based on triplet-triplet...
The structural factors affecting triplet-triplet annihilation (TTA) at the molecular level are not well-understood. Here, our steady-state photoluminescence and transient absorption results demonstrate that spin statistical factor, η, decreases from 0.60 to 0.46 0.14 going 9,10-diphenylanthracene (DPA) 1,5-DPA 2,6-DPA isomers, respectively, during photon upconversion with a platinum octaethylporphyrin sensitizer. Density functional theory (DFT) shows η depends on energetics of hot triplet...
During photon upconversion, quantum dots (QDs) transfer energy to molecules in solution through a long ligand shell. This insulating shell imparts colloidal stability at the expense of efficient photosensitization. For first time, we quantify barrier these aliphatic ligands pose for triplet solution. Using transient absorption spectroscopy, experimentally measure small damping coefficient 0.027 Å-1 exceeding 10 carbons length. The dynamic nature lowers charge or compared organic thin films....
In triplet-triplet annihilation based photon upconversion, controlling triplet energy transfer (TET) through the system is key to unlocking higher efficiencies. this work, we vary size of colloidally synthesized CdSe nanocrystals (NCs) examine effects on TET during using steady-state measurements and transient absorption spectroscopy. As NC increases, upconversion quantum yield (QY) decreases due decrease in rate from surface bound anthracene transmitter ligand, as expected for Marcus...
Nanocrystals that can absorb strongly in the near-infrared (NIR) wavelengths for conversion to visible light are of great interest biological imaging applications. In this work, we examine an inverse Type-I heterostructure with inner InP shell triplet–triplet annihilation-based photon upconversion. The InP-based nanocrystals earth-abundant, benign, and be synthetically tuned entire NIR window I. Here, a two monolayer ZnS was used passivate surface defects on ZnSe/InP core/shell particles. We...
Here, films using CdSe nanocrystal (NC) triplet photosensitizers in conjunction with diphenylanthracene (DPA) emitters doe for the conversion of green to blue light.
Upconverting erbium(III) complexes in N,N -dimethylformamide (DMF) were prepared via chloride ligand replacement by tetrafluoroborate, as suggested changes the spectral profile. Cl − removal precipitated salts was evidenced X-ray diffraction (XRD) analysis. The systematic spectroscopic work indicated optimal condition for complex preparation. Ions coordination site controlled adjusting water phase, thus amount of removed salts. Maximum emission intensity, lower red-to-green ratio and...
Polyyne bridges have attracted extensive interest as molecular wires due to their shallow distance dependence during charge transfer. Here, we investigate whether triplet energy transfer from cadmium selenide (CdSe) quantum dots (QDs) anthracene acceptors benefits the high conductance associated with polyyne bridges, especially potential cumulene character in excited states. Introducing π-electron rich oligoyne between surface-bound anthracene-based transmitter ligands, explore rate CdSe QDs...