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Rozprawy doktorskie na temat „Nanocrystals - Luminescence”

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Data publikacji: 7 września 2023

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1

Maksimchuk, P., A. Masalov, V. Seminko, and Yu Malyukin. "Formation of Luminescence Centers in Oxygen-Deficient Cerium Oxide Nanocrystals." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35446.

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In this work the peculiarities of oxygen vacancies formation in cerium oxide nanoparticles for different external influences have been investigated by spectroscopic methods. The features of oxygen vacancies and therefore non-stoichiometric cerium oxide formation in CeO2 nanocrystals depending on the atmosphere of high temperature treatment were investigated. Stimulation of oxygen vacancies formation in reducing and neutral atmospheres was revealed. Occurrence of two different luminescence centers (viz. the charge-transfer complexes formed by Ce4+ and O2- ions, and Ce3+ ions stabilized by
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SARTORI, EMANUELA. "EMISSIVE NANOCRYSTALS FOR OPTOELECTRONIC APPLICATIONS." Doctoral thesis, Università degli studi di Genova, 2022. http://hdl.handle.net/11567/1074636.

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Metal halide perovskites (particularly doped perovskites and lead free double perovskites) are starting to generate great interest in the scientific community due to their unique electronic and structural properties, such as high photoluminescent quantum yields (PLQY, up to 90%), chemical diversity in terms of elements employed and tunable optical properties. Consequently, their application in optoelectronic devices gained attention. During these three years, I intensively worked on the synthesis and characterization of inorganic perovskites nanocrystals, starting from lead halide perovskites
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Seminko, V. V., Yu V. Malyukin, and A. A. Masalov. "Spectroscopically detected segregation of Pr3+ ions in Y2SiO5 nanocrystals." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35434.

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Segregation of Pr3+ ions in Y2SiO5:Pr3+ nanocrystals was revealed by means of spectroscopic techniques. Increase of doped ions concentration in the near-surface layer of Y2SiO5:Pr3+ nanocrystals was confirmed by modification of luminescence spectra with the heat treatment temperature. Relaxation of excess elastic stresses created by Pr3+ ions with volumes greater than volume of regular Y3+ ion was determined to be the main cause of observed effects. Theoretical estimations clearly confirm the preliminary predictions. When you are citing the document, use the following link http://essuir.su
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4

Wilkinson, Andrew Richard. "The optical properties of silicon nanocrystals and the role of hydrogen passivation /." View thesis entry in Australian Digital Program, 2006. http://thesis.anu.edu.au/public/adt-ANU20060202.111537/index.html.

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Williams, Diane Keith. "Particle Size Dependence on the Luminescence Spectra of Eu3+:Y2O3 and Eu3+:CaO." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/29719.

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Since the Eu3+ ion can occupy different cation sites in a host material, it can serve as a useful probe of nanocrystalline structures to gain more insight into the structural changes that can occur when the particle size is reduced from the bulk to nanometer regime. The use of laser spectroscopy to probe two nanocrystalline structures, Eu3+:Y2O3 and Eu3+:CaO, was investigated. The nanocrystalline structures were prepared by the laser-vaporization-gas-phase condensation of the bulk oxides. The particle size distribution and dominant particle diameters of the nanocrystals were determined by
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6

Vezzoli, S. "EXPERIMENTAL STUDY OF NANOCRYSTALS AS SINGLE PHOTON SOURCES." Doctoral thesis, Università degli Studi di Milano, 2013. http://hdl.handle.net/2434/222688.

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Wet-chemically synthesized colloidal nanocrystals are promising single photon emitters at room temperature, due to the strong quantum confinement induced by the small dimensions. However, their applications have been so far limited by two main drawbacks: the blinking of their photo-luminescence and a non-polarized emission. This manuscript is consecrated to the study of the optical properties of a particular type of colloidal nanocrystals, called dot-in-rod (DR), in which a spherical CdSe core is surrounded by a rod-like CdS shell. We demonstrate for the first time a suppression of the blin
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7

La, Rosa Marcello. "Development of luminescent semiconductor nanocrystals (Quantum Dots) for photoinduced applications." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0591/document.

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Cette thèse s’est focalisée sur le développement de nanocristaux semi-conducteurs luminescents, i.e. des boîtes quantiques (quantum dots, QDs), pour des applications photo-induites. Ces nanomatériaux possèdent des propriétés optiques très intéressantes qui dépendent de leur taille et sont prometteurs pour des applications dans divers domaines.Les QD sont généralement hydrophobes mais de nombreuses applications intéressantes requiert une compatibilité avec l'eau ou du moins avec un environnement polaire. Cela, nécessite donc un traitement post-synthétique afin de modifier leur solubilité.Au cou
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8

Schnabel, Manuel. "Silicon nanocrystals embedded in silicon carbide for tandem solar cell applications." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:da5bbb64-0bcd-4807-a9f3-4ff63a9ca98d.

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Tandem solar cells are potentially much more efficient than the silicon solar cells that currently dominate the market but require materials with different bandgaps. This thesis presents work on silicon nanocrystals (Si-NC) embedded in silicon carbide (SiC), which are expected to have a higher bandgap than bulk Si due to quantum confinement, with a view to using them in the top cell of a tandem cell. The strong photoluminescence (PL) of precursor films used to prepare Si-NC in SiC (Si-NC/SiC) was markedly reduced upon Si-NC formation due to simultaneous out-diffusion of hydrogen that passivate
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9

Kumar, Upkar. "Plasmon logic gates designed by modal engineering of 2-dimensional crystalline metal cavities." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30170/document.

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L'objectif principal de cette thèse est de concevoir, fabriquer et caractériser les dispositifs plasmoniques basés sur les cavités métalliques bidimensionnelles monocristallines pour le transfert d'information et la réalisation d'opérations logiques. Les fonctionnalités ciblées émergent de l'ingénierie spatiale et spectrale de résonances plasmon d'ordre supérieur supportées par ces cavités prismatiques. Les nouveaux éléments étudiés dans cette thèse ouvrent la voie à de nouvelles stratégies de transfert et de traitement de l'information en optique intégrée et miniaturisée. Dans un premier temp
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10

Eloi, Fabien. "Étude de la luminescence de nanocristaux semi-conducteurs couplés avec des structures plasmoniques à températures ambiante et cryogénique." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLV117/document.

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Les nanocristaux semi-conducteurs colloïdaux possèdent des propriétés photo-physiques qui en font des objets de choix pour des applications variées, comme le marquage biologique, le photovoltaïque ou encore l'optique quantique. Dans cette thèse, nous étudions les modifications, introduites par des réseaux d'or, de la fluorescence de nanocristaux CdSe/CdS à coquille épaisse. Nous présentons tout d'abord les propriétés fondamentales de ces nanocristaux de CdSe/CdS puis la manière dont leurs propriétés d'émission peuvent être contrôlées par l'environnement électromagnétique, en détaillant en part
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11

Weimmerskirch, Jennifer. "Propriétés de luminescence et caractérisation structurale de films minces d'oxydes de silicium dopés au cérium et codopés cérium-ytterbium." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0180/document.

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Ce travail de thèse concerne l’élaboration et la caractérisation chimique et structurale de couches minces d’oxyde de silicium dopées avec des terres rares ainsi que l’étude de leurs propriétés de photoluminescence. Les films sont dopées avec du cérium. Le co-dopage cérium et ytterbium est également étudié dans le cas des couches de SiO2. Il est montré que dans les oxydes de composition SiO1, le cérium joue un rôle important dans la structure et l’organisation chimique de l’oxyde, notamment en favorisant la démixtion de l’oxyde. L’exposition à un faisceau laser focalisé engendre une démixtion
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12

Yahia, Ammar Akram. "Synthèse, caractérisations et fonctionnalisation de nanocristaux semi-conducteurs luminescents." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAF058/document.

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Nous avons développé plusieurs méthodes de synthèse de nanocristaux semi-conducteurs luminescents directement en solution aqueuse. Des nanoparticules de CdTexSy ont été préparées en phase aqueuse et les propriétés optiques ont été étudiées. Suite aux caractérisations chimiques, un modèle a été proposé pour calculer le poids moléculaire et déterminer la formule molaire des nanoparticules de CdTexSy. Nous avons démontré l’existence d’une relation entre le rendement quantique et le nombre de ligand à la surface des nanoparticules. Les propriétés optiques ont été améliorées grâce à la synthèse sou
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13

Kork, El Nayla. "Near field optical spectroscopy of hybrid nanoparticles for biosensor application and confocal microscopy of single silicon nanocrystals." Thesis, Lyon 1, 2009. http://www.theses.fr/2009LYO10108/document.

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Le domaine des nanomatériaux joue un rôle de plus en plus important dans de nombreuses applications, qu’elles soient de natures biologique, médicales électroniques etc… Dans ce travail, nous présenterons des résultats concernant deux types de nanoparticules, le premier genre traite de nanoparticules hybrides confectionnées chimiquement pour des fins biologiques, le deuxième concerne des nanocristaux de silicium fabriqués par pyrolise laser pour des applications potentielles en optoélectronique. Les études sont menées en mettant en œuvre deux différentes techniques optiques, l’une en champ loin
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14

Biteen, Julie Suzanne Heath James R. "Plasmon-enhanced silicon nanocrystal luminescence for optoelectronic applications /." Diss., Pasadena, Calif. : Caltech, 2006. http://resolver.caltech.edu/CaltechETD:etd-05312006-163455.

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15

Pringle, Todd Andrew. "Non-Thermal Plasma Synthesis of Luminescent Silicon Nanocrystals from Cylclohexasilane." Diss., North Dakota State University, 2019. https://hdl.handle.net/10365/31690.

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In this report we establish cyclohexasilane (CHS) as a reliable precursor for non-thermal plasma synthesis of high quality photoluminescent silicon nanocrystals (SiNCs). We demonstrate that this synthesis approach can produce high quality, size tunable silicon quantum dots with quantum yields exceeding 60% as synthesized (subsequent work in our group has measured over 70% quantum yield after density gradient ultracentrifugation size purification).After a brief background on non-thermal plasma synthesis, the characterization methods used in this study, and an overview of CHS, we report at lengt
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16

La, Rosa Marcello <1989&gt. "Development of Luminescent Semiconductor Nanocrystals (Quantum Dots) for Photoinduced Applications." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amsdottorato.unibo.it/8059/1/LaRosa_Marcello_Tesi.pdf.

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This thesis focuses on the development of luminescent semiconductor nanocrystals quantum dots (QDs) for photoinduced applications. QDs are promising nanomaterials with size-dependent optical properties and are attractive for applications in several fields. However, QDs are commonly hydrophobic and many interesting applications require their compatibility with water or at least with a polar environment, meaning a post-synthetic treatment is required to confer a different solubility. During these studies, a new method for transferring QDs from an apolar solvent to another one polar has been s
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17

Chen, Yue Ph D. Massachusetts Institute of Technology. "Syntheses of biocompatible luminescent nanocrystals for visible and short-wave infrared imaging applications." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/115798.

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Thesis: Ph. D. in Physical Chemistry, Massachusetts Institute of Technology, Department of Chemistry, 2018.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>The primary focus of this thesis is to synthesize biocompatible luminescent nanocrystals for visible and short-wave infrared (1-2 [mu]m, SWIR) imaging applications. Quantum dots (QDs) have been promising fluorescent probes for biomedical imaging due to their high quantum yield (QY), narrow photoluminescence spectra, and excellent photostability. However, challenges remain to be solved to transfer the as-s
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18

CAPITANI, CHIARA. "Synthesis of semiconductor colloidal nanocrystals with large Stokes-shift for luminescent solar concentrators." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2022. http://hdl.handle.net/10281/366195.

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I concentratori solari luminescenti (LSCs) sono delle guide d’onda composti da una matrice polimerica drogata o ricoperta con fluorofori. La luce solare diretta e/o diffusa che penetra nella matrice è assorbita dai fluorofori e poi riemessa dagli stessi con energia minore. La luce emessa, grazie alla riflessione totale interna, propaga fino a raggiungere i bordi della guida d’onda dove è convertita in elettricità da celle fotovoltaiche poste sul perimetro della matrice. L’efficienza del dispositivo è ridotta da numerosi processi di perdita, sia dovuti alla riflessione della matrice e al cono d
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19

Morselli, Giacomo <1994&gt. "Synthesis and electronic properties of luminescent silicon nanocrystals and copper indium sulphide quantum dots." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amsdottorato.unibo.it/10175/1/Thesis_Morselli%20G.pdf.

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In the last decades, nanomaterials, and in particular semiconducting nanoparticles (or quantum dots), have gained increasing attention due to their controllable optical properties and potential applications. Silicon nanoparticles (also called silicon nanocrystals, SiNCs) have been extensively studied in the last years, due to their physical and chemical properties which render them a valid alternative to conventional quantum dots. During my PhD studies I have planned new synthetical routes to obtain SiNCs functionalised with molecules which could ameliorate the properties of the nanoparticle.
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20

Levchuk, Ievgen [Verfasser], Christoph [Gutachter] Brabec, and Rainer [Gutachter] Hock. "Design and optimization of luminescent semiconductor nanocrystals for optoelectronic applications / Ievgen Levchuk ; Gutachter: Christoph Brabec, Rainer Hock." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2017. http://d-nb.info/1139171550/34.

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Talapin, Dmitri V. "Experimental and theoretical studies on the formation of highly luminescent II-VI, III-V and core shell semiconductor nanocrystals." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=964732297.

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22

Debieu, Olivier [Verfasser], Friedrich [Akademischer Betreuer] Huisken, Rob [Akademischer Betreuer] Elliman, and Blas [Akademischer Betreuer] Garrido. "Optical characterization of luminescent silicon nanocrystals embedded in glass matrices / Olivier Debieu. Gutachter: Friedrich Huisken ; Rob Elliman ; Blas Garrido." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2012. http://d-nb.info/101996958X/34.

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López, Vidrier Julià. "Silicon Nanocrystal Superlattices for Light-Emitting and Photovoltaic Devices." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/334396.

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During the last decades, silicon nanocrystals have focused great attention due to the size-dependent physical properties they present, attributed to the quantum confinement effect. This, added to the bulk silicon compatibility with the well-established microelectronics technology and the low mining and manipulation costs this material presents, makes silicon a potential candidate for the growing photonics and optoelectronics fields. In particular, the tunnability of the electronic properties of silicon nanocrystals can be reached by controlling the nanocrystal size. This has been recently achi
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24

Steveler, Émilie. "Etude des mécanismes de photoluminescence dans les nitrures et oxydes de silicium dopés aux terres rares (Er, Nd)." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0109/document.

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Ce travail de thèse est dédié à l'étude des transitions radiatives dans les matériaux de nitrure et d'oxyde de silicium dopés aux ions de terres rares (Er3+, Nd3+). La caractérisation optique des films minces élaborés par évaporation thermique est basée sur la spectroscopie de photoluminescence. Les études menées s'inscrivent dans la recherche de processus d'excitation indirecte des ions Er3+ et Nd3+ dans des matrices à base de silicium. Dans les nitrures et oxynitrures de silicium, un processus de transfert d'énergie permettant l'excitation indirecte des ions Er3+ est mis en évidence. Pour le
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25

Grün, Mathias. "Les nanocristaux de silicium comme source de lumière : analyse optique et réalisation de microcavités." Thesis, Nancy 1, 2010. http://www.theses.fr/2010NAN10108/document.

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Ce travail de thèse concerne la réalisation et l'analyse des propriétés optiques de nanocristaux de silicium. Ces objets de taille nanométrique possèdent des propriétés optiques remarquables, en particulier de photoluminescence. Les propriétés de confinement quantique qui les caractérisent permettent d'obtenir un signal de luminescence intense dans le domaine du visible. Des composants optoélectroniques et photoniques ont été envisagés à base de nanocristaux de silicium. Les raisons physiques du fort signal de luminescence en revanche sont encore mal comprises. Les nanocristaux de silicium son
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26

Chang, Tung-Wah Frederick. "Luminescence and energy transfer excitation of infrared colloidal semiconductor nanocrystals /." 2006. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=442439&T=F.

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Cheylan, Stephanie. "Optical properties of silicon nanocrystals." Phd thesis, 2001. http://hdl.handle.net/1885/144961.

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Chang, Chia-Wei, and 張家瑋. "Down- and Up-converted Visible Luminescence Properties of Er3+-doped Y2Ti2O7 Nanocrystals." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/80944779317381649090.

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碩士<br>國立中正大學<br>光機電整合工程所<br>97<br>Er3+-doped Y2Ti2O7 thin films with the thickness of ~375 nm thin films were fabricated by the sol-gel spin-coating method. A pyrochlore phase ErxY2-xTi2O7 was observed with a strong (222) preferred orientation while the annealing temperature exceeded 800 °C. Below 800 °C annealing, thin films exhibited amorphous structure. The average visible transmittance calculated in the wavelength range 200–1100 nm of the Er3+-doped Y2Ti2O7 thin films annealed at 400 to 900 °C reduced from ~87 to ~77% because of the increase of grain size and surface roughness. The variati
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Chiu, Yi-Shan, and 邱意珊. "A study on preparation and luminescence properties of Er3+-doped Y2Ti2O7 nanocrystals." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/23018698376874802380.

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碩士<br>國立中正大學<br>光機電整合工程所<br>98<br>Er3+-doped Y2Ti2O7 nanocrystals were fabricated by the sol-gel method. While the annealing temperature exceeds 757 °C, amorphous pyrochlore phase Er3+-doped Y2Ti2O7 transfers to well-crystallized nanocrystals, and the average crystal size increases from ~70 to ~180 nm under 800 to 1000 °C/1 h annealing. The Er3+-doped Y2Ti2O7 nanocrystals absorbing the 980 nm photons can produce the up-conversion (526, 547, and 660 nm; 2H11/2→4I15/2, 4S3/2→4I15/2 and 4F9/2→4I15/2, respectively) and Stokes luminescence (1528 nm; 4I13/2→4I15/2). The IR PL decay curve is singl
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Chien, Yungchuan, and 簡勇全. "Up and Down-converted visible luminescence properties of Er3+ doped Gd2Ti2O7 nanocrystals." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/34303679092975627005.

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碩士<br>國立中正大學<br>光機電整合工程研究所<br>100<br>Er3+-doped Gd2Ti2O7 nanocrystals were fabricated by the sol-gel method. While the annealing temperature exceeds 800 °C, amorphous pyrochlore phase Er3+-doped Gd2Ti2O7 transfers to well-crystallized nanocrystals, and the average crystal size increases from ~70 to ~180 nm under 800 to 1200 °C/1 h annealing. The Er3+-doped Gd2Ti2O7 nanocrystals absorbing the 980 nm photons can produce the up-conversion (526, 547, and 660 nm; 2H11/2→4I15/2, 4S3/2→4I15/2 and 4F9/2→4I15/2, respectively) and Stokes luminescence (1528 nm; 4I13/2→4I15/2). The IR PL decay curve is si
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Vetrone, Fiorenzo. "Luminescence spectroscopy of Er³⁺ doped inorganic nanocrystals : an investigation into their upconversion properties." Thesis, 2005. http://spectrum.library.concordia.ca/8450/1/NR04038.pdf.

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This thesis presents a detailed investigation into the spectroscopic properties of inorganic nanocrystals doped with trivalent rare earth ions. We focus on their upconversion luminescence, emission of radiation at higher energy than the pump wavelength, and evaluate the fundamental mechanisms of upconversion in the nanocrystal. We evaluate the spectroscopic properties of sesquioxide nanocrystals doped with trivalent erbium (M 2 O 3 :Er 3+ , where M = Y, Lu, or Sc) prepared by the propellant synthesis technique. Characteristic green, red, and near-infrared Er 3+ emission is observed following
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32

Lin, Guang Chun, and 林廣春. "Up-converted Visible Luminescence Properties of Er3+ and Yb3+ Co-doped Y2Ti2O7 Nanocrystals." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/40667102353356229108.

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碩士<br>國立中正大學<br>光機電整合工程研究所<br>99<br>The (Er3+, Yb3+)-codoped Y2Ti2O7 nanocrystals were synthesized by the sol-gel method in this work. We were focused on the fluorescent properties of different annealing temperature and different dopent concentrations of ytterbium ions. Er3+ (5%) & Yb3+ (5, 10, 15, 20%)-codoped Y2Ti2O7 nanocrystals with particle size of 50~120 nm were synthesized by the sol-gel method. The strong green band centered at 547 nm (4S3/2 → 4I15/2) and red band centered at 678 nm (4F9/2 → 4I15/2) visiable emission and weak blue band centered at 409 nm (2H9/2 → 4I15/2) emission wer
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Chen, Hsiang-Yun. "Energy Transfer Dynamics and Dopant Luminescence in Mn-Doped CdS/ZnS Core/Shell Nanocrystals." Thesis, 2012. http://hdl.handle.net/1969.1/148167.

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Mn-doped II-VI semiconductor nanocrystals exhibit bright dopant photoluminescence that has potential usefulness for light emitting devices, temperature sensing, and biological imaging. The bright luminescence comes from the 4T1→6A1 transition of the Mn2+ d electrons after the exciton-dopant energy transfer, which reroutes the exciton relaxation through trapping processes. The driving force of the energy transfer is the strong exchange coupling between the exciton and Mn2+ due to the confinement of exciton in the nanocrystal. The exciton-Mn spatial overlap affecting the exchange coupling streng
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Yu-Ping, Li, and 李御賓. "A Study on Up-converted Luminescence Properties of Er3+-doped Gd2Ti2O7 Nanocrystals and Films." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/51643065022876576680.

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碩士<br>國立中正大學<br>光機電整合工程研究所<br>102<br>The purpose of this paper is to change the different doping concentration and the process temperature to synthesize of Er3+-doped Gd2Ti2O7 powders and films, and to explore its fluorescence properties　and characteristics of thin films. Er3+-doped Gd2Ti2O7 nanocrystals were fabricated by the sol-gel method.Under the 980 nm laser excitation of the Er3+ (10 mol%) – doped Gd2Ti2O7 powder with annealing more than 800 ℃ can produce the up-conversion (405, 520, 545, and 650 nm; 2H9/2→4I15/2, 4H11/2→4I15/2, 4S3/2→4I15/2 and 4F9/2→4I15/2, respectively) and Stokes lu
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Foxy and 邱智偉. "A study on preparation and luminescence properties of Er3+, Tm3+,Yb3+-doped Y2Ti2O7 nanocrystals." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/hg2h7s.

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碩士<br>國立中正大學<br>光機電整合工程研究所<br>100<br>Abstrct The (Er3+, Tm3+, Yb3+)-codoped Y2Ti2O7 nanocrystals were synthesized by the sol-gel method in this work. We were focused on the fluorescent properties of different annealing temperature and different highest common factor a concentrations. Er3+ &Tm3+& Yb3+ -codoped Y2Ti2O7 nanocrystals with particle size of 32~124 nm were synthesized by the sol-gel method. The green band centered at 547 nm (4S3/2 → 4I15/2) and red band centered at 660 nm (4F9/2 → 4I15/2) visiable emission and blue band centered at 488 nm (1G4→3H6) emission were observed in codoped n
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Tseng, Yu-Jui, and 曾于芮. "Luminescence Properties of Cs4PbBr6 Perovskite Nanocrystals for the Application in Light-Emitting Diode Backlight Display." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/5ukgcv.

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碩士<br>國立臺灣大學<br>化學研究所<br>107<br>In recent years, the zero-dimensional Cs4PbBr6 crystals are respected as the new generation of functional materials for their good thermal stability and optical performance. Not only do the zero-dimensional perovskite Cs4PbBr6 nanocrystals retain the optical properties of traditional perovskite nanocrystals with a narrow full width at half maximum (FWHM) of ∼20 nm, high absorbance and high quantum efficiency, but they also solve a long-lasting stability problem in perovskite nanocrystals. However, the mechanism of the green emission from the Cs4PbBr6 crystals is
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Hsia, Yuan-Lung, and 夏淵龍. "Photoluminescence of I-VII Semiconductor Compounds, ensitized Luminescence from “Deep States” Recombination in CuBr/AgBr Nanocrystals." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/12472942856643999311.

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碩士<br>高雄醫學大學<br>醫藥暨應用化學研究所碩士在職專班<br>95<br>The photoluminescence (PL) properties of CuBr and CuBr/AgBr semiconductor nanocrystals (NCs) embedded in borosilicate glasses are measured under band-to-band excitation by a 355 nm Nd:YAG laser. We observed emission from CuBr (peaked at 520 nm) doped glass, which is associated with deep states in CuBr NCs. We also observed the sensitized blue to orange-red emission in CuBr/AgBr-glass systems (peaked at 520 and 570 nm), in which the luminescence intensity of CuBr decreases with increasing AgBr concentrations, while it is enhanced significantly around 57
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Tu, Vu Duc, and 武得途. "Hybrid nanostructured materials based on upconversion nanocrystals for biomedical applications: Enhanced upconversion luminescence and Simultaneous bioimaging and photothermal therapy." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/4tb55z.

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博士<br>國立中正大學<br>物理系研究所<br>106<br>Lanthanide (Ln3+) doped upconversion nanoparticles (UCNPs) possess unique upconversion luminescence (UCL) properties which can generate ultraviolet-visible (UV-VIS) luminescence under continuous-wave near-infrared (NIR) excitation via a stepwise multiphoton absorption process. Up to date, UCNPs have been studied for diverse research applications in display, security, photovoltaic and biomedicine. Compared with traditional downconversion fluorophores, such as organic dyes, quantum dots and gold nanomaterials, UCNPs exhibits numerous advantages to serve as a biom
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Chiu, Shih-Hsuan, and 邱詩暄. "Matrix Effects on structural properties and luminescence of Ge nanocrystals formed by condensation of SiGe via high-temperature oxidation." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/xcgetg.

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碩士<br>國立交通大學<br>電子研究所<br>107<br>In this thesis, we summarized the process-controlled capability to produce Ge quantum dots (QDs) embedded within SiO2 and Si3N4 matrix. The matrix-strain imposed on the Ge QDs could be successfully modulated by changing the embedded materials and removing these embedded materials or not. The significant Raman shifts reveal that Ge QDs are subjected to 1.4% tensile strain, -0.55% compressive strain and -2.67 compressive strain, respectively, from embedded SiO2 and Si3N4 matrices. Low-temperature photoluminescence (PL) spectra show that changing the strain state o
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CHEN, YI-CHIA, and 陳奕嘉. "Study of Enhanced Luminescence and Stability of Cesium Lead Halide Perovskite CsPbX3 Nanocrystals by Cu2+-Assisted Anion Exchange Reactions." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/w8qtff.

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碩士<br>東海大學<br>化學系<br>107<br>All inorganic CsPbX3 (X = Cl, Br, I) perovskite nanocrystals (NCs) have good application for optoelectronic devices such as solar cell and LEDs due to their excellent optical properties such as tunable emission wavelength, bright PL emission, and high photoluminescence quantum yield (PLQY). However, owing to its unstable crystal structure, it cannot maintain the great optical properties, and its synthesis process is too cumbersome. Here, we used a simple anion exchange reaction of CsPbCl3 perovskite NCs to obtain CsPbCl3 and CsPbBr3-xClx NCs, which treated by CuX2-O
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Dzurňák, Branislav. "Studium polovodičů metodami časově rozlišené laserové spektroskopie: Luminiscenční spektroskopie nanokrystalického diamantu." Doctoral thesis, 2012. http://www.nusl.cz/ntk/nusl-307932.

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Title: Study of semiconductors by methods of time resolved laser spectroscopy: Luminescence spectroscopy of nanocrystalline diamond Author: Branislav Dzurňák Department: Department of Chemical Physics and Optics Supervisor: doc. RNDr. František Trojánek, Ph.D. Abstract: The PhD thesis is focused on optical properties of nanocrystalline diamond prepared by chemical vapour deposition method. Photoluminescence of nanocrystalline diamond samples and effects of ambient temperature, pressure, pH and UV irradiation on it are studied by laser spectroscopy. Results suggest the keyrole of water and air
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42

Lin, Ko-Chun, and 林可淳. "Interface traps of the N-type MOS structure with Ge nanocrystals characterized by G-V measurement and Si electron-luminescence." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/95863045534093738187.

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碩士<br>國立臺灣大學<br>電子工程學研究所<br>96<br>In this work, Metal-Oxide-Semiconductor structure with germanium nanocrystals formed by E-gun evaporator for charge storage and luminescence is fabricated. Fabricated devices are characterized by Transmission Electron Microscope. In the characterization of memory performance of devices with different PMA time, high frequency capacitance-voltage (C-V) measurement is used to measure the memory window for comparing the charge storage capacity. Frequency varied from 1000kHz to 5kHz which means exchanging speeds are slower, but the memory windows still exist. The c
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Žídek, Karel. "Nelineární optické vlastnosti křemíkových nanostruktur." Doctoral thesis, 2010. http://www.nusl.cz/ntk/nusl-296108.

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Název práce: Nelineární optické vlastnosti křemíkových nanostruktur Autor: Karel Žídek Katedra (ústav): Katedra chemické fyziky a optiky Vedoucí disertační práce: Doc. RNDr. František Trojánek, Ph.D. E-mail vedoucího: trojanek@karlov.mff.cuni.cz Abstrakt: Disertační práce se zabývá nelineárními optickými jevy a ultrarychlým vývojem luminis- cence křemíkových nanokrystalů. Pomocí metody optického hradlování signálu (časové rozlišení až 250 fs) porovnáváme ultrarychlý vývoj luminiscence křemíkových nanokrystalů s různými ve- likostmi (v řádu jednotek nanometrů) a také s rozdílnými formami pasiva
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Fučíková, Anna. "Bioaplikace nových nanostrukturních materiálů." Doctoral thesis, 2012. http://www.nusl.cz/ntk/nusl-312192.

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Title: Bioapplications of novel nanostructured materials Author: Anna Fučíková Department / Institute: Department of Chemical Physics and Optics, Faculty of Mathematics and Physics, Charles University in Prague Supervisor of the doctoral thesis: Doc. RNDr. Jan Valenta, Ph.D., Department of Chemical Physics and Optics, Faculty of Mathematics and Physics, Charles University in Prague Abstract: This work is aimed at development of new fluorescent labels based on silicon nanocrystals. Nanodiamonds and commercial CdSe quantum dots have been used as comparative materials. Silicon nanocrystals are re
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Kijatkin, Christian. "Ultrafast Photon Management: The Power of Harmonic Nanocrystals in Nonlinear Spectroscopy and Beyond." Doctoral thesis, 2019. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-201904011323.

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The present work broaches the physics of light-matter interaction, chiefly using nonlinear optical spectroscopy in a newly developed framework termed as Photon Management Concept. This way, existing fragments dealing with specific properties of harmonic and upconversion nanoparticles (HNPs/UCNPs) are consolidated into a full and coherent picture with the primary goal of understanding the underlying physical processes and their impact on the application side, especially in terms of imaging techniques, via suitable experimental and numerical studies. Contemporary optical setups involving cont
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Biteen, Julie Suzanne. "Plasmon-Enhanced Silicon Nanocrystal Luminescence for Optoelectronic Applications." Thesis, 2006. https://thesis.library.caltech.edu/2333/1/Julie_Biteen_PhD_Thesis_2006.PDF.

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<p>On the path toward the realization of silicon-based optical emitters for integrated microelectronics, this thesis studies the optoelectronic properties of silicon nanocrystals as a function of their surface passivation and their interactions with plasmonic materials. The first part of the thesis utilizes controlled oxidation exposures and photoluminescence spectroscopy to verify previous theoretical and computational predictions of oxygen-related surface states that effectively narrow the energy band gap of small silicon nanocrystals. The focus of the second half of the thesis is on exper
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Fan, Huang-Yu, and 范晃毓. "The Luminescence effect of Multi-layer Ge nanocrystal in MOS." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/84184876876853288597.

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碩士<br>國立臺灣大學<br>電機工程學研究所<br>95<br>The advantage of the optoelectronic component of silicon germanium is fully compatible with the Si-based microelectronic chips. Because SiGe-based optoelectronic devices can be tailored from 1.3 to 1.55 um, it increases the importance of this material system to fiber communication applications. With the ripe process technology of the several key devices like SiGe-based light emitters, photodetectors, modulators, and waveguides, it also opens the door for Si-based optical and electronic integrated circuits (OEICs). In this thesis we first fabricated a device wh
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Chiang, Yi-Ting, and 江宜庭. "Novel Synthesis of Perovskite Nanocrystals for Applications in Luminescent Solar Concentrator and Photocatalysis." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/p5arqh.

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碩士<br>國立交通大學<br>應用化學系分子科學碩博士班<br>107<br>In this thesis, we have devolped a robust hot-addition method (HAM) inspired by the hot injection method. HAM can solve the problem that the organic cation is easily decomposed at high temperature which cause difficulty for synthesizing the organic-inorganic hybrid perovskite nanocrystals. The HAM can synthesize highly crystalline and stable organic-inorganic perovskite nanocrystal with great photoluminescent quantum yield and tunable optical properties. The MAPbBr3 and CsFAPbBr3 were successfully synthesized by the hot addition method, which proved that
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Stephanie, Lee. "Luminescent indium phosphide nanocrystals formed from single-source precursors using fluoride-containing ionic liquids." Thesis, 2018. http://hdl.handle.net/2097/39147.

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Master of Science<br>Department of Chemistry<br>Emily McLaurin<br>Quantum dot (QD) or semiconductor nanocrystal research has propagated extensively over the past few years due to increasing interest in long lasting, renewable, and safe applications such as solar cells and LEDs. Quantum dots are utilized for their size dependent optical properties that are based on the quantum confinement effect. Cadmium-based materials dominated early quantum dot research, which led to honing of syntheses and expansion of our understanding of various mechanisms. Recently, however, current applications, such as
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Lin, Jian-Hao, and 林建豪. "Study of luminescent mechanisms of silicon nanocrystals embedded in SiOX matrix、ZnO and In2Se3 semiconductors." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/85295411427980655551.

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