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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"Upconverting"”.
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Upconverting nanoparticles: pushing theory and technology towards biomedical applications
… scattering and absorption in living tissues. Upconverting nanoparticles (UCNPs) possess the desirable properties of absorbing and emitting NIR light, making them ideal contrast agents for biomedical applications. UCNPs have shown promise in deep tissue imaging, optogenetics, photodynamic …
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Investigation of the energy transfer network in upconverting nanoparticles
Upconverting nanoparticles (UCNPs) have emerged as promising luminescent materials for a wide range of applications, including bioimaging, drug delivery, and photovoltaics. The intricate network of energy transfer processes within UCNPs enables their unique ability to convert low-energy infrared …
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THE SYNTHESIS, CHARACTERIZATION, AND UPCONVERTING PROPERTIES OF ERBIUM DOPED; YTTERBIUM, ERBIUM CO-DOPED YTTRIUM OXYSULFIDE PHOSPHORS UNDER 808, 980, AND 1560 nm EXCITATION
… under 808, 980, and 1560 nm excitation. The upconverting mechanisms excited at 808, 980, and 1560 nm have been investigated in detail. The power dependent behavior of the upconverted emission intensities for singly doped erbium phosphors excited at 808 and 980 nm indicated a two-photon …
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Synthesis, Functionalization, and Characterization of Dominant UV Emitting Upconverting Nanocrystals and Absolute Quantum Yield and Power Dependence Metrics for the Elucidation of Upconversion Mechanisms
… compositions and ex vivo light activation. Upconverting nanocrystals (UCNCs) are one such class of nanomaterial wherein near-infrared (NIR) light, at the nadir of tissue absorption, can serve to sequentially or cooperatively excite long-lived lanthanide (Ln3+) 4f excited states and, through …
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Identification of bacteria-regulated mechanisms for the pathogenesis of inflammatory bowel diseases (IBD) and development of upconverting nanoparticle (UCNP) luminescence imaging for the monitoring of gut bacteria
… these limitations, we propose to develop upconverting nanoparticles (UCNPs) luminescence imaging for monitoring of gut bacteria. Their unique property of photon upconversion enables them to convert low energy near-infrared (NIR) light into higher energy visible/NIR light offering greater …
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Optoperforation of Intact Plant Cells, Spectral Characterization of Alloy Disorder in InAsP Alloy Disorder in InAsP Alloys, and Bimetallic Concentric Surfaces for Metal-Enhanced Fluorescence in Upconverting Nanocrystals
… achieve broadband metal-enhanced fluorescence in upconverting NaYF4:Yb,Er nanocrystals, two nanocomposite architectures were proposed that retrofit metallic nanoshells to these lanthanide-doped nanocrystals. The typical monometallic construction was rejected in favor of architectures featuring …
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Quantum information applications of frequency upconversion
… infrared single-photon detectors by upconverting infrared photons to visible ones and using efficient silicon avalanche photo diodes to detect the upconverted photon. We have achieved a net system detection efficiency of 56%, far superior to previous methods for infrared photon …
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Strategies for High-Performance Solid-State Photon Upconversion
… losses, and the fundamental limit from the upconverting process—triplet-triplet annihilation (TTA)—itself. In this thesis, we investigate strategies to tackle the limitations in solid-state photon upconversion. First, optical absorption is enhanced via embedding an archetypical solid-state …
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Infrared-to-visible upconversion in hybrid thin films of colloidal nanocrystals and organic molecules
… that compared to the previous all-molecular upconverting systems, the use of inorganic NCs helps extend the excitation wavelength into the infrared and offers simple wavelength tunability.
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Apkonvertuojančių NaGdF4:Yb3+,Er3+ nanodalelių sintezė, paviršiaus modifikavimas branduolio-lukšto metodu ir tyrimas /
The main aim of the thesis was to obtain upconverting NaGdF4:Yb3+,Er3+ nanoparticles with enhanced luminescent properties and of a size appropriate for applications in biological systems. The thermal decomposition pathway was chosen to synthesize the particles. The obtained materials were …
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Tailoring Intermolecular Interactions for High-Performance Nanocomposites
… useful matrix for incorporation of silica-coated upconverting nanoparticles, affording upconverting nanoparticle composite films.The novel ionene monomer N1,N2-bis(3-(dimethylamino)propyl)oxalamide permitted synthesis of novel oxalamide-containing ammonium ionenes. The hydrogen bonding, charge …
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The Design, Synthesis and Characterization of Lanthanide-based Nanomaterials and Their Use in 3D Biological Imaging and Radiation Dosimetry
… leverage the unique photophysical properties of upconverting nanomaterials and (3) the application of scintillating nanoscale radiation detection materials as an alternative to the single-crystal bulk lanthanide doped materials and plastic scintillators currently employed.</p><p>In many proposed …
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Metal oxides for efficient infrared to visible upconversion
… white emitting systems are the most efficient upconverting samples reported to date for green, red and white light emission, which makes them serious candidates for many of the applications listed above. The upconversion mechanisms were determined for the first time by means of indepth …
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Development of Liquid Crystalline Elastomers as Soft Mechanical Actuators
… light actuation in LCE with the assistance of upconverting nanoparticles and azobenzene dyes. However, due to time and resource limitations, they yielded no successful discovery in the end. Nevertheless, some experimental plans were made in order to inspire the reader to join the further …
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Microfluidic processes to create structured microparticle arrangements and their applications
… changes. Second, we synthesize multi-striped, upconverting nanocrystal (UCN)-laden microparticles using SFL. Distinct upconversion emission colors are combined with the ability to spatial pattern them, providing superior encoding capacities. We can fine-tune upconversion emission by controlling …
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Surface conjugation of upconversion nanoparticles via supramolecular host-guest self-assembly
Surface functionalization and conjugation hold the key to driving many purpose-synthesized nanoparticles into real-world applications. Lanthanide (Ln) ions doped upconversion nanoparticle (UCNP) is a good example: while it delivers a great promise as molecular probes, sensors, drug carriers and …
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Drug Delivery Strategies Using Light Sensitive Molecules
… UV. Recently, several groups have reported using Upconverting Nanoparticles (UCNP) for the purpose of drug activation. The basis of this phenomenon is that the incidence of NIR light on these particles initiates multi-photon processes, eventually emitting UV/VIS wavelengths. The advantage of the …