Global ETD Search
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 10 of 10 for “"Photon Upconversion"”.
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Strategies for High-Performance Solid-State Photon Upconversion
Photon upconversion, a process that converts multiple low-energy photons into higher energies, has promising applications such as photovoltaics, bio-imaging, and photo-chemistry. Among the techniques capable of achieving photon upconversion, manipulating the excited states of organic molecules is …
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Design and Synthesis of Photoactive Metal-Organic Frameworks for Photon Upconversion and Energy Transfer Studies
… emission spectroscopy and time-correlated single photon counting (TCSPC) spectroscopy and are compared to those of the corresponding ligand in solution. Both the unique fluorescent properties of the ligand as well as individual framework structure, result in distinctive luminescent behavior and …
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Infrared-to-visible upconversion in hybrid thin films of colloidal nanocrystals and organic molecules
Photon upconversion is a process where two or more low-energy photons are converted into a single higher-energy photon. Upconversion that turns infrared photons into visible ones is particularly useful, having potential applications in photovoltaics, infrared sensing, and biological imaging. In …
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Investigation of the energy transfer network in upconverting nanoparticles
… into higher-energy visible light through photon upconversion, presenting significant challenges for accurate modeling. Despite their broad applications, theoretical models of UCNPs remain incomplete, and current models fail to accurately reproduce all experimental results. This thesis …
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Ultrafast sources of entangled photons for quantum information processing
… and metrology. Most of these applications use photons as carriers of quantum information. Therefore, engineering the quantum state of photons is essential for the realization of novel QIP schemes. A practical and flexible technique to generate high-purity entangled photon pairs is spontaneous …
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Triplet-Triplet Annihilation Upconversion in Solid-State Organic-Inorganic Ureasil Polymer Hosts
Triplet–triplet-annihilation upconversion (TTA-UC) has attracted significant attention as an approach to harvest low energy solar photons that cannot be captured by conventional photovoltaic devices. However, device integration requires the design of solid-state TTA-UC materials that combine high …
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Photophysical Studies of Active Layer Compositions in Organic Solar Cells
… solar cells. We finally propose integrating photon upconversion via triplet-triplet annihilation (TTA-UC) into an OSC to recycle the low-energy triplets. This should effectively give these excitations a second chance to contribute to the photocurrent. We show the presence of TTA-UC in an …
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Controlling nanomaterial self-assembly for next generation optoelectronic applications
… wide ranging and include: LEDs, photovoltaics, photon downconversion, photon upconversion, and thermoelectrics. However, their size-dependent band gap can also be a hindrance, as any size variation in the ensemble of nanocrystals introduces energetic disorder and spatial disorder in films. While …
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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
… 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 tissue penetrance and signal-to-noise ratio. Here, we investigated the possibility of using UCNP 1) to image a …
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Materials, photophysics and device designs for high efficiency photovoltaics
… and (iii) triplet-triplet annihilation assisted upconversion. Following a review of the relevant background theory for organic semiconductors, colloidal quantum dot (CQD) semiconductors and perovskite semiconductors, we discuss their applications in inexpensive, solution-processed, optoelectronic …