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Relevant bibliographies by topics / Luminescence quenching / Dissertations / Theses

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Dissertations / Theses on the topic 'Luminescence quenching'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 March 2023

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1

Trice, Brian Edward. "Nonlinear Luminescence Quenching in Eu2O3." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/30960.

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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 between excited centers, the result is an additional nonradiative decay pathway that lowers luminescence quantum efficiency. During investigations into the spectra and dynamics of Eu2O3, an apparent saturation dip in the excitation spectra of nano-sized Eu2O3 particles was observed. This thesis de

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2

FLEEMAN, WENDI LEIGH. "SELF-QUENCHING AND CROSS-QUENCHING REACTIONS OF PLATINUM(II) DIIMINE COMPLEXES." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1070634712.

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3

Jayarajah, Christine N. "Luminescence quenching studies of oxygen diffusion in highly permeable media." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ34033.pdf.

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4

Fan, Jia. "Concentration quenching mechanism in doped OLED materials." HKBU Institutional Repository, 2007. http://repository.hkbu.edu.hk/etd_ra/829.

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5

Chowdhury, Sanchari. "Application of Luminescence Sensors in Oxygen Diffusion Measurement and Study of Luminescence Enhancement/Quenching by Metallic Nanoparticles." Scholar Commons, 2010. https://scholarcommons.usf.edu/etd/1599.

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The first part of this dissertation deals with the application of a luminescence quenching method to measure diffusion and permeation coefficients of oxygen in polymers. Most luminescence oxygen sensors do not follow linearity of the Stern-Volmer (SV) equation due to heterogeneity of luminophore in the polymer matrix, thus the complexity of data analysis is increased. To circumvent this limitation, inverted fluorescence microscopy is utilized in this work to investigate the SV response of the sensors at the micron-scale. In these diffusion experiments, oxygen concentration is measured by lumin

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6

Mondin, Andrea. "OXYGEN OPTICAL SENSORS BASED ON LUMINESCENCE QUENCHING OF ORGANOMETALLIC COMPLEXES EMBEDDED IN POLIMERIC MATRIXES." Doctoral thesis, Università degli studi di Padova, 2011. http://hdl.handle.net/11577/3422036.

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The subject of the present research deals with optical sensors for detecting oxygen. They are based on the quenching by oxygen of the luminescence of organometallic complexes embedded in polymeric matrixes. Excitation light is provided by a LED source and a photodiode is employed as detector. Optical sensor may substitute electrochemical ones, because they allow in situ, real time, non destructive measurements. They are more robust than electrochemical ones reducing the need of frequent calibration and membrane replacement. Attention has been focused on luminescence-intensity-based sensors, i

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7

Herne, Renaud A. "Etude de senseurs optiques à oxygène basés sur le quenching de la luminescence de complexes orthométallés du Pt(II)." Doctoral thesis, Universite Libre de Bruxelles, 1996. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/212346.

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8

Navarra, Kelly R. "Development of the Pressure-Sensitive-Paint Technique for Advanced Turbomachinery Applications." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36840.

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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 pressure-sensitive-paint (PSP) technique is now commonly used in stationary wind-tunnel tests; this thesis presents the extension of the technique to advanced turbomachinery applications. New pressure- and temperature-sensitive paints (TSPs) have been developed for application to a state-of-the-art transonic compres

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9

Fylymonova, I., Yu V. Malyukin, and A. V. Sorokin. "Migration of Frenkel Excitons in PIC J-aggregates." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35095.

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Using luminescent exciton traps, an efficiency of the exciton migration in J-aggregates of pseudoisocyanine dye in solutions has been investigated. Applying a modified Stern-Volmer equation for an analysis of the J-aggregates luminescence quenching by the trap, the quenching of 50% of PIC J-aggregates luminescence at the ratio PIC/trap = 70:1 has been found. To increase the exciton migration efficiency, the Jaggregate structure was improved by the formation of a "J-aggregate-surfactant” complex. It results in 35% enhancement of the exciton migration efficiency in PIC J-aggregates. When yo

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10

Odame-Ankrah, Charles Anim. "Studies of Titanium Dioxide Nanoparticles and Surfactants Effects, Singly and in Combinations, on Luminescence Intensity of Some Aromatic Compounds." Digital Commons @ East Tennessee State University, 2009. https://dc.etsu.edu/etd/1799.

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Luminescence techniques are sensitive, selective, and widely used in analysis. Luminescence intensity is attenuated by quenchers. This research has focused on the use of surfactants such as CTAB, SDS, and TX-100 singly or together with TiO2 nanoparticles to evaluate their individual and combined effects on some fluorescent aromatic compounds such as pyrene, fluoranthene, anthracene, phenanthrene, and carbazole. Rutile phase TiO2 was synthesized using the low temperature sol-gel method. Carbazole and phenanthrene were severely quenched by all surfactants singly or in combination with TiO2. Anth

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11

Xue, Ruipeng. "Nanofiber Based Optical Sensors for Oxygen Determination." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1405508835.

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12

Gelloz, Bernard. "Contribution à l'étude des mécanismes de conduction du silicium poreux : application aux phénomènes de luminescence." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10153.

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Ce travail est consacre aux mecanismes de conduction du silicium poreux en contact avec un electrolyte liquide conducteur, ainsi qu'a l'etude du comportement de la luminescence sous polarisation. La premiere partie presente les principales caracteristiques de la luminescence du silicium poreux ainsi que les differents modeles qui ont ete proposes pour en expliquer les mecanismes. La deuxieme partie est consacree a la description des methodes experimentales utilisees pour la fabrication des couches poreuses et l'etude de leurs proprietes de photo et d'electroluminescence. Dans une troisieme par

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13

Petitfils, Aurélie. "Propriétés thermoluminescentes du diamant CVD : applications à la dosimétrie des rayonnements ionisants." Toulouse 3, 2007. http://thesesups.ups-tlse.fr/44/.

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Ce travail souligne l'intérêt du diamant synthétique pour la dosimétrie par thermoluminescence (TL) et plus particulièrement pour la radiothérapie. La première partie de ce travail porte sur les propriétés thermoluminescentes et dosimétriques du diamant polycristallin élaboré par synthèse CVD. Les résultats obtenus montrent que ce matériau est bien adapté pour la dosimétrie médicale par TL. La deuxième partie de ce travail s'intéresse à l'application du diamant CVD en radiothérapie. Des mesures de profils de dose, de rendements en profondeur sous photons et électrons, la cartographie d'un fais

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14

Darne, Raphaëlle. "Etude photophysique des transferts pariétaux." Vandoeuvre-les-Nancy, INPL, 1996. http://docnum.univ-lorraine.fr/public/INPL_T_1996_DARNE_R.pdf.

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L’objectif de la recherche est la mise au point d'un capteur photophysique pour l'étude des phénomènes de transfert de matière en milieu biphasique gaz-liquide. Le principe repose sur l'inhibition de fluorescence de molécules greffées sur le capteur, par l'oxygène dissous dans l'eau. La variation d'intensité de fluorescence est une fonction linéaire de la concentration en oxygène, celle-ci étant elle-même reliée au coefficient de transfert volumique, kLa. Dans ce but, deux actions principales ont été développées: - la réalisation et l'étude de la fixation chimique de la molécule fluorescente s

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15

Silva, Iran Ferreira da Silva. "Complexos de isotiocianatos de lantanídeos com quelantes aromáticos: supressão da luminescência mediada pela transferência de energia tripleto-estado de transferência de carga." Universidade Federal da Paraíba, 2015. http://tede.biblioteca.ufpb.br:8080/handle/tede/8192.

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Submitted by Maike Costa (maiksebas@gmail.com) on 2016-05-11T11:38:41Z No. of bitstreams: 1 arquivo total.pdf: 5689290 bytes, checksum: 55be9a3cf14a111bd7b7407cbca5df8e (MD5)<br>Made available in DSpace on 2016-05-11T11:38:41Z (GMT). No. of bitstreams: 1 arquivo total.pdf: 5689290 bytes, checksum: 55be9a3cf14a111bd7b7407cbca5df8e (MD5) Previous issue date: 2015-08-07<br>The photoluminescence efficiency in compounds of lanthanide ions is a result of the complex balance between absorption of photons, energy transfer and quenching mechanisms, among which the multiphonon decay and suppress

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16

Doffek, Christine [Verfasser], Michael [Akademischer Betreuer] Seitz, and Martin [Akademischer Betreuer] Feigel. "Multiphonon-Quenching in near-infrared luminescent lanthanoid cryptates / Christine Doffek. Gutachter: Michael Seitz ; Martin Feigel." Bochum : Ruhr-Universität Bochum, 2016. http://d-nb.info/1095884549/34.

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17

"The development of divalent metal ion sensors based on intramolecular luminescence quenching." Tulane University, 1999.

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The first two sections of this work discuss the development of a sensor system for metal ions. The same receptor, 2,2'-bipyridine, was used in all of the systems explored, and the overall specificity of the sensing system was achieved through binding equilibria and relative quenching rates. The first system discussed is a tetra-bipyridylphenyl-porphyrin. In all cases quenching results following formation of a ground state complex between a bipyridyl moiety of the porphyrin and the metal ion. For the Zn(II) tetra-bipyridylphenyl-porphyrin, luminescence quenching is only observed with Co(Il), Ni

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18

Kuo, Jiun-Ren, and 郭峻任. "Study of the Luminescence Quenching of CdSe Quantum Dots near Gold Nanoparticles." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/19069516423908211581.

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碩士<br>國立東華大學<br>物理學系<br>99<br>In this work, we studied the luminescence quenching of CdSe quantum dots (QDs) near gold nanoparticles (Au NPs). CdSe QDs were adsorbed on modified 3-Mercaptopropyl-trimethoxysilane substrate. Then we used centrifugal method to deposit Au NPs onto CdSe QD film. The gap distances between CdSe QD and Au NP were controlled by their surface modifications (e.g., 3-Mercaptopropionic acid, 8-Mercaptooctanoic acid, and 11-Mercaptoundecanoic acid). We studied the relation between the luminescence quenching and gap distance and found that the photoluminescence quenched when

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