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.
Results
Showing 1 to 15 of 15 for “"luminescence quenching."”.
-
Nonlinear Luminescence Quenching in Eu2O3
Nonlinear luminescence quenching has been documented in numerous systems such as organic crystals, rare earth insulators, laser materials, semiconductors, and phosphors. In each of these systems nonlinear luminescence quenching occurs under conditions of high excitation density from interactions …
-
Photoluminescence quenching of organic thin films by transparent conductive oxides
… in designing organic light-emitting diodes is luminescence quenching near an electrode. In this work, we investigate the underlying mechanism behind luminescence quenching by measuring the reduction in Alq3 photoluminescence due to SnO02. Using an analytical model and a Monte Carlo simulation …
-
Triplet Exciton Management in Organic Electronic Devices
… by a resistance to concentration-dependent luminescence quenching. Electron spin resonance has been used to investigate the mechanism of intersystem crossing between singlets and triplets in the important organic light-emitting diode material, 4CzIPN. It is demonstrated that the …
-
Hybrid optoelectronics with colloidal nanocrystals
… CdSe/CdS-NR is measured in time resolved luminescence quenching experiments. Retrieval of stored excitations is demonstrated employing a synchronised ultrafast voltage pulse detection scheme.
-
Responsive, multimodal imaging agents for MRI: advancing the detection of metals and oxidized species implicated in neurodegenerative disorders
… exhibited traditional time delayed lanthanide luminescence. The second probe, a core-shell MION@organic@Au multimodal imaging probe was also designed. It was found that the organic intermediate layer maintain the relaxivity of the core nanoparticles, while the gold shell exhibited significant …
-
Development of colloidal quantum dot and lead halide perovskite light emitting devices
… (QD-LED) under reverse bias. Using field-induced luminescence quenching to our advantage, we show that a large electric field can strongly modify QD carrier dynamics, resulting in stable and reversible QD photoluminescence (PL) modulation. Next, we address the QD's toxicity issue by developing a …
-
Synthesis and characterization of cerium-doped lanthanum halide colloidal nanocrystals
… host lattice protecting activators to prevent luminescence quenching, and fast decay-time radiative transitions between cerium levels. Cerium-doped bulk lanthanum bromide is reported to have a light yield of 60,000 photons/MeV, 2.5% full-width-to-half-maximum energy resolution (variation in …
-
Expanded cyclophanes for switchable capture/release of metal complexes
… by 1 H NMR spectroscopy, 2D ROESY and luminescence emission spectroscopy. This chemically redox-switchable system with luminescence outcomes can be regarded as an all-chemical RS Flip-Flop, integrating with a downstream PASS 1 gate or an IMPLICATION gate. Besides, two cyclophane …
-
Characterisation and optimisation of novel Sol-Gel materials for luminescence-based 02 sensing
… (ORganically MOdified SILicate) matrices for luminescence-based O2 sensing. The O2 sensing scheme is based on the luminescence quenching of the highly 0 2 - sensitive ruthenium complex [Ru(II)-tris(4,7-diphenyl-l,10-phenanthroline) dichloride], entrapped in a porous sol-gel film. A phase …
-
Synthesis, functionalisation and characterisation of germanium nanocrystals & their applications
… and sensitive detection of Fe3+ ions. The luminescence quenching mechanism is confirmed by lifetime and absorbance spectroscopies, while the applicability of this assay for detection of Fe3+ in real water samples is investigated and found to satisfy the US Environmental Protection Agency …
-
Self-Assembly of Plasmonic and/or Luminescent Nanostructures.
… formation of a band may result in the loss of luminescence. Hence, it appears that gold nanoparticles can alternatively be luminescent or plasmonic and this represents a severe constraint for their use as an optical material. To overcome such a limitation, and achieve the above-mentioned …
-
Development of the Pressure-Sensitive-Paint Technique for Advanced Turbomachinery Applications
A new pressure-measurement technique which employs the tools of molecular spectroscopy has recently received considerable attention in the fluid mechanics community. Measurements are made via oxygen-sensitive molecules attached to the surface of interest as a coating, or paint. The …
-
Upconversion quantum yield and luminescence of beta-NaYF4:Yb3+,Er3+ nanoparticles
… two or more near-infrared (NIR) photons. This UC luminescence (UCL) makes UCNPs very attractive for the use as optical probes in the biomedical area. In this respect, the main advantages of UCNPs are the suppression of environment-based background fluorescence as well as their excitability with …
-
Synthesis, Functionalization, and Characterization of Dominant UV Emitting Upconverting Nanocrystals and Absolute Quantum Yield and Power Dependence Metrics for the Elucidation of Upconversion Mechanisms
… crystallographic surface defects and UC luminescence quenching sites to overall enhance the dominant UV emissivity of novel co-doped UCNC. These state-of-the-art UC materials are: 1) α-NaYbF4: Tm3+, interlaced with gallium, chromium, yttrium, and other trivalent metal ions, serving to …