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Dissertations / Theses on the topic 'Doped Nanocrystals'

Author: Grafiati

Published: 9 March 2023

Last updated: 31 July 2025

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1

Sutton, Rebecca Suzanne. "Dual-emitting Cu-doped ZnSe/CdSe nanocrystals." Thesis, Kansas State University, 2015. http://hdl.handle.net/2097/19047.

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Master of Science<br>Department of Chemistry<br>Emily McLaurin<br>Cu-doped ZnSe/CdSe core/shell nanocrystals were synthesized using the growth doping method. Upon shell growth, the nanocrystals exhibit dual emission. The green luminescence peak is assigned as band edge emission and the broad, lower energy red peak is due to Cu dopant. Although, the oxidation state of Cu in the nanocrystals is debated, the emission is explained as recombination of a hole related to Cu²⁺ with an electron from the conduction band. The emission changed in the presence of dodecanethiol. Generally, the band edge emi

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2

PINCHETTI, VALERIO. "Advanced Spectroscopy of Interface Engineered, Doped and “Electronically” Doped Colloidal Semiconductor Nanocrystals." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2018. http://hdl.handle.net/10281/199097.

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I nanocristalli colloidali a semiconduttore (NC) sono materiali processabili da soluzione che, dalla loro scoperta 30 anni fa, hanno attirato l’attenzione in campo scientifico e tecnologico per le loro proprietà ottiche ed elettriche. Infatti, i NC hanno un ampio range di potenziali applicazioni, che vanno dalle sorgenti luminose, alle celle solari, al bioimaging fino all’informazione quantistica. Ciò è dovuto alla profonda conoscenza e controllo delle loro proprietà elettroniche che si è raggiunto. Infatti, queste ultime si possono modificare controllando la dimensione, la composizione ma anc

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3

Kriegel, Ilka. "Near-infrared plasmonics with vacancy doped semiconductor nanocrystals." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-164558.

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Plasmonics with heavily doped semiconductor nanocrystals (NCs) is an emerging field in NC science. However, impurity doping of NCs remains far from trivial and is, as yet, dominated by a low chemical control over the incorporated dopant atoms. An appealing alternative is vacancy doping, where the formation of vacancies in the structure is responsible for an increased carrier density and elegantly circumvents the issues related to impurity doping. Due to high carrier densities of around 10^21cm^(-3) localized surface plasmon resonances (LSPRs) in the near infrared (NIR) are expected, and as suc

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4

Nordin, Muhammad N. "Magneto optical study of undoped and doped PbS nanocrystals." Thesis, University of Surrey, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.606691.

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Magneto optical studies of colloidal PbS nanocrystals (NCs) have been undertaken to determine their fundamental properties. Measurements including absorption, photoluminescence (PL) and PL lifetime decay are presented along with their dependence upon temperature, magnetic field, and magnetic dopant concentration for undoped and doped PbS NCs. Temperature dependence of undoped PbS NCs, recorded from 300 K down to 3 K, displays a Stoke shift increasing from ~7 5 meV to ~125 meV which is fitted using a three-level rate equation model, supported by PL lifetime decay measurements, that indicate ene

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5

Lounis, Sebastien Dahmane. "The influence of dopant distribution on the optoelectronic properties of tin-doped indium oxide nanocrystals and nanocrystal films." Thesis, University of California, Berkeley, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3686398.

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<p> Colloidally prepared nanocrystals of transparent conducting oxide (TCO) semiconductors have emerged in the past decade as an exciting new class of plasmonic materials. In recent years, there has been tremendous progress in developing synthetic methods for the growth of these nanocrystals, basic characterization of their properties, and their successful integration into optoelectronic and electrochemical devices. However, many fundamental questions remain about the physics of localized surface plasmon resonance (LSPR) in these materials, and how their optoelectronic properties derive from t

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6

Clark, Maurice Tzeng Y. "Growth and characterization of nitrogen doped nanocrystalline diamond films." Auburn, Ala., 2006. http://hdl.handle.net/10415/1313.

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7

Kriegel, Ilka [Verfasser], and Jochen [Akademischer Betreuer] Feldmann. "Near-infrared plasmonics with vacancy doped semiconductor nanocrystals / Ilka Kriegel. Betreuer: Jochen Feldmann." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2013. http://d-nb.info/1046503316/34.

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8

Chen, Xiaobo. "Synthesis and Investigation of Novel Nanomaterials for Improved Photocatalysis." Case Western Reserve University School of Graduate Studies / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=case1117575871.

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9

ROSINA, IRENE. "Exploiting Cation Exchange Reactions in Doped Colloidal NIR Semiconductor Nanocrystals: from synthesis to applications." Doctoral thesis, Università degli studi di Genova, 2020. http://hdl.handle.net/11567/1019427.

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Colloidal quantum dots (CQDs) have tunable optical properties through manipulation of their size, shape, and surface chemistry. Among pholuminescent QDs, near-infrared (NIR) emitting ones are of particular interest since they can be used in several applications, from the labeling in living tissues, to the integration in commercial optoelectronic devices, like photovoltaics for solar energy conversion or photodetectors from visible to the near-infrared and mid-infrared. In addition, the exciting promise of CQDs is that is associated with easy and low-cost device fabrication process. In fact, so

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10

Archer, Paul I. "Building on the hot-injection architecture : giving worth to alternative nanocrystal syntheses /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/8520.

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11

Ruhge, Forrest. "EFFECT OF GERMANIUM DOPING ON ERBIUM SENSITIZATION IN THE ERBIUM DOPED SILICON RICH SILICA MATERIAL SYSTEM." Master's thesis, University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2933.

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The continued size reduction in electronic integrated circuits has lead to a demand for on-chip high-bandwidth and low loss communication channels. Optical interconnects are considered an essential addition to the silicon electronics platform. A major challenge in the field of integrated Si photonics is the development of cost effective silicon compatible light sources. This thesis investigates the sensitization of group IV doped silica films emitting at 1.535μm for applications as silicon compatible light sources. Thin erbium-doped silica films containing excess silicon and germanium wer

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12

Kaleli, Buket. "Towards Silicon Based Light Emitting Devices: Photoluminescence From Terbium Doped Silicon Matrices With Or Without Nanocrystals." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610614/index.pdf.

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In this study, silicon (Si) rich silicon dioxide (SiO2) films and terbium (Tb) embedded in three different Si containing films has been produced by e-beam evaporation and magnetron sputtering techniques. Post deposition annealing was done for different temperatures and durations to study its effect on both Si nanocrystal formation and Tb luminescence. It was verified by X-ray diffraction technique (XRD) that Si nanocrystals were formed in Si rich matrices. Energy dispersive X-ray (EDS) spectroscopy analysis was carried out to determine the relative concentrations of the atoms inside the produc

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13

Muckel, Franziska [Verfasser], and Gerd [Akademischer Betreuer] Bacher. "Transition metal doped colloidal semiconductor nanocrystals : from functionality to device development / Franziska Muckel ; Betreuer: Gerd Bacher." Duisburg, 2018. http://d-nb.info/1155722787/34.

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14

Muckel, Franziska Elisabeth [Verfasser], and Gerd [Akademischer Betreuer] Bacher. "Transition metal doped colloidal semiconductor nanocrystals : from functionality to device development / Franziska Muckel ; Betreuer: Gerd Bacher." Duisburg, 2018. http://d-nb.info/1155722787/34.

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15

Crockett, Brandon. "Mechanistic insights into structure-property relationships of doped metal oxide nanocrystals produced from a continuous growth synthesis." Thesis, University of Oregon, 2019. http://hdl.handle.net/1794/24556.

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Colloidal metal oxide nanocrystals have tremendous potential to solve some of the world’s biggest problems in energy storage and harvesting, medicine, catalysis, electronics, and information technology. Colloidal metal oxide nanocrystals display unique size- and structure-dependent properties that differ from the bulk materials. The incorporation and utilization of these nanomaterials into modern technology hinges upon chemists’ abilities to synthesize the nanomaterials with atomic-level precision and control over size, morphology, composition, and surface chemistry. To this end, advances in s

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16

Seregin, Vladimir Victor. "Part I, Fabrication and surface modification of composite biomaterials based on silicon and calcium disilicide Part II, Synthesis and characterization of erbium doped silicon nanocrystals encapsulated by aluminum and zinc oxides /." Fort Worth, Tex. : Texas Christian University, 2006. http://etd.tcu.edu/etdfiles/available/etd-04252006-145309/unrestricted/seregin.pdf.

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17

Kim, Changsu. "Optical, laser spectroscopic, and electrical characterization of transition metal doped ZnSe and ZnS nano- and microcrystals." Birmingham, Ala. : University of Alabama at Birmingham, 2009. https://www.mhsl.uab.edu/dt/2009r/kim.pdf.

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Thesis (Ph. D.)--University of Alabama at Birmingham, 2009.<br>Title from PDF title page (viewed Feb. 3, 2010). Additional advisors: Renato Camata, Derrick Dean, Chris M. Lawson, Andrei Stanishevsky, Sergey Vyazovkin. Includes bibliographical references (p. 133-140).

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18

DE, TRIZIO LUCA. "Polymer nanocomposites for illumination: towards warm white light." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2013. http://hdl.handle.net/10281/41175.

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The aim of this PhD project, also called “warm white light project”, is to propose an alternative solid state lighting device that works using the same principles of color-conversion WLEDs. The idea is to create a polymer based nanocomposite that could work as a transparent glass in off-mode and as a “lamp” in on-mode. The new concept is to spatially decouple the light source and the converters in order to avoid all the thermal problems that affect the current LEDs (in which the color is “generated” within the chip and the epoxy case). To do so, a blue LED, made of Indium gallium nitride (InGa

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19

Gul, Sheraz. "Synthesis, Optical and Structural Characterization, and Exciton Dynamics of Doped ZnSe Nanocrystals, and, Simultaneous X-ray Emission Spectroscopy of Two Elements Using Energy Dispersive Spectrometer." Thesis, University of California, Santa Cruz, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3630692.

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<p> Doped semiconductor quantum dots (QDs) comprise an important subclass of nanomaterials in which a small quantity of impurity is added intentionally, adding another degree of freedom to alter their size-dependent physical and electronic properties. Intense, tunable, long lived and stable photoluminescence make them quintessential candidates for many opto-electronic applications including solid-state lighting, display devices and biomedical imaging. ZnSe QDs, which are blue-emitting fluorophores, were doped with Cu<sup>+1</sup> to redshift their photoluminescence (PL) to green region of the

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20

Liu, William K. "Electron spin dynamics in quantum dots, and the roles of charge transfer excited states in diluted magnetic semiconductors /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/8588.

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21

Icli, Kerem Cagatay. "Core-shell Type Nanocrystalline Fto Photoanodes For Dye Sensitized Solar Cells." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612328/index.pdf.

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Aim of this work is to construct dye sensitized solar cells employing core shell type nanocrystalline FTO/TiO2 photoanodes. Fluorine doped tin dioxide (FTO) nanoparticles were synthesized under hydrothermal conditions. Homogeneously precipitated SnO2 nanoparticles were dispersed in aqueous solutions containing NH4F as fluorine source and heat treated at 180oC for 24 hours. X-Ray analysis revealed that particles show rutile type cassiterite structure. Particles had 50 m2/g specific surface area measured by BET. Particle size was around 15-20 nm verified by XRD, BET and SEM analysis. Electrical

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22

Mikulec, Frederic Victor 1971. "Semiconductor nanocrystal colloids : manganese doped cadmium selenide, (core)shell composites for biological labeling, and highly fluorescent cadmium telluride." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9358.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1999.<br>Includes bibliographical references.<br>This thesis describes the characterization and applications of nanometer sized semiconductor (or quantum dot) colloids produced by chemical means. The nanocrystals are synthesized by pyrolysis of organometallic precursors in the coordinating solvent trioctylphosphine oxide (TOPO). The important developments that have contributed to this method are discussed. Manganese doped CdSe nanocrystals are synthesized using a manganese and selenium containing organometallic compound

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23

Samadi, Khoshkhoo Mahdi [Verfasser], and Marcus [Akademischer Betreuer] Scheele. "Tin-doped Indium Oxide (ITO) Nanocrystal Superlattices (Surface Chemistry, Charge Transport, and Sensing Applications) / Mahdi Samadi Khoshkhoo ; Betreuer: Marcus Scheele." Tübingen : Universitätsbibliothek Tübingen, 2018. http://d-nb.info/1198973072/34.

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24

Skrzypczak, Ulrich Verfasser], Gerhard [Akademischer Betreuer] Seifert, Jan Christoph [Akademischer Betreuer] [Goldschmidt, and Grant V. M. [Akademischer Betreuer] Williams. "Rate equation analysis of nanocrystal-enhanced upconversion in neodymium-doped glasses / Ulrich Skrzypczak. Betreuer: Gerhard Seifert ; Jan Christoph Goldschmidt ; Grant V. M. Williams." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2015. http://d-nb.info/1072072750/34.

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25

Geszke-Moritz, Malgorzata. "Synthesis of stable and non-cadmium containing quantum dots conjugated with folic acid for imaging of cancer cells." Thesis, Vandoeuvre-les-Nancy, INPL, 2011. http://www.theses.fr/2011INPL066N/document.

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Les Quantum Dots (QDs) sont des particules cristallines de semi-conducteur ou du métal de forme sphérique et de dimension nanométrique. L'intérêt majeur des QDs réside dans leur grande adaptabilité à de nombreuses applications biologiques.Le but de mon travail était de développer une nouvelle classe de QDs de faible toxicité afin de les utiliser pour la bio-imagerie des cellules cancéreuses. Pour cela, il est nécessaire de préparer des sondes hydrosolubles, photostables, biocompatibles, de luminescence élevée et possédant une faible toxicité. La synthèse des cœurs de type ZnS and ZnSe dopés au

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26

Jana, Santanu. "Synthesis, Photo-physical Studies and Applications of Different Doped and Un-doped Semiconductor Nanocrystals." Thesis, 2019. http://hdl.handle.net/10821/8294.

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High quality semiconductor nanocrystals (quantum dots, QDs) are small crystal consisting of hundreds to a few thousand atoms each with typical dimension ranging from 1-100 nm which are great interest for fundamental studies and different technological applications such as light emitting devices, lasers, solar cells and biomedical labeing. The quantum mechanical coupling of over hundreds to thousands atoms develops the band structure in semiconductors. In this regime, the spatial confinement of the electronic charge carriers in the nanocrystal leads to a phenomenon known as Quantum Confinement

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27

Silva, Estelina Lora da. "Electronic properties of doped silicon nanocrystals." Master's thesis, 2010. http://hdl.handle.net/10316/13812.

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No presente trabalho estuda-se, através de modelação computacional baseada na teoria do funcional da densidade, os efeitos de impurezas em nanocristais de silício passivados com hidrogénio. São calculados os níveis de energia das impurezas intersticiais mais propícias à dopagem de tipo-n e p para os sistemas con nados, nomeadamente os três primeiros elementos pertencentes ao grupo dos alcalinos, Li, Na e K, e os três primeiros halogéneos, F, Cl e Br. Observou-se que à temperatura ambiente estas impurezas não contribuem com portadores de carga (electrões ou lacunas) para os estados HOMO n

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28

Hazarika, Abhijit. "Photophysical Properties of Manganese Doped Semiconductor Nanocrystals." Thesis, 2015. http://etd.iisc.ac.in/handle/2005/3675.

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Electronic and optical properties of semiconducting nanocrystals, that can be engineered and manipulated by various ways like varying size, shape, composition, structure, has been a subject of intense research for more than last two decades. The size dependency of these properties in semiconductor nanocrystals is direct manifestation of the quantum confinement eﬀect. Study of electronic and optical properties in smaller dimensions provides a platform to understand the evolution of fundamental bulk properties in the semiconductors, often leading to realization and exploration of entirely new an

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29

Hazarika, Abhijit. "Photophysical Properties of Manganese Doped Semiconductor Nanocrystals." Thesis, 2015. http://etd.iisc.ernet.in/2005/3675.

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Electronic and optical properties of semiconducting nanocrystals, that can be engineered and manipulated by various ways like varying size, shape, composition, structure, has been a subject of intense research for more than last two decades. The size dependency of these properties in semiconductor nanocrystals is direct manifestation of the quantum confinement eﬀect. Study of electronic and optical properties in smaller dimensions provides a platform to understand the evolution of fundamental bulk properties in the semiconductors, often leading to realization and exploration of entirely new an

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30

Yi, Guang-Shun, and Gan-Moog Chow. "Rare-Earth Doped LaF₃ Nanocrystals for Upconversion Fluorescence." 2005. http://hdl.handle.net/1721.1/30391.

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Upconversion fluorescent nanocrystals, Yb-Er, Yb-Ho and Yb-Tm co-doped LaF₃ were chemically synthesized. The average particle size was 4.4 nm with a narrow size distribution of ± 0.3 nm. Under the 980 nm NIR excitation, the green, red and blue emission bands from these nanocrystals were observed, respectively. These nanocrystals have potential applications as bio-probes and displays.<br>Singapore-MIT Alliance (SMA)

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31

Boyer, John-Christopher. "Synthesis and spectroscopy of upconverting lanthanide-doped nanocrystals." Thesis, 2006. http://spectrum.library.concordia.ca/9236/1/boyer_john%2Dchristopher_2006.pdf.

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In the past two decades it has been widely demonstrated that the optical properties of select inorganic materials may be modified by changing either their size or shape on the nanometer level (sub-nanometer to 100 nm length scale). Much of the early research on this topic focused on semiconducting nanocrystals, where it has been effectively demonstrated that reducing particle size below their Bohr radius produced a characteristic blue shift of the band gap absorption. A little over a decade after the initial work on semiconducting nanocrystals, the first scientific articles on insulating nanoc

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32

Sarkar, Suresh. "SYNTHESIS AND STUDY OF DIFFERENT PHOTO-PHYSICAL ASPECTS OF DOPED AND UNDOPED SEMICONDUCTOR NANOCRYSTALS." Thesis, 2019. http://hdl.handle.net/10821/8319.

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In recent days, synthesis of high quality semiconductor nanocrystals of groups II-VI, III-V, IV-VI like CdSe, InP, SnS etc. remains one of the prime interest for understanding the fundamental photo-physics of semiconductor nanocrystals and their potential applications in advanced technology for fabricating display devices, solar cell, LEDs etc. These nanocrsyals are also extensively used in the field of biology for drug delivery, cell imaging, DNA, protein structure analysis, in different kinds of photo-induced catalytic reactions etc. The optoelectrical properties of the semiconductor nanocry

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33

Lin, Xi-Cong, and 林熙琮. "Synthesis and Optical Properties of Mn2+ Doped ZnS Nanocrystals." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/33984445122788205353.

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碩士<br>國立彰化師範大學<br>光電科技研究所<br>94<br>Mn2+ doped ZnS nanocrystals were synthesized by chemical method. The structure, morphology and optical properties of these nano-particles were studied by the means of X-ray diffraction (XRD), transmission electron microscope (TEM), photoluminescence (PL) and photoluminescence excitation (PLE) measurements. The XRD patterns showed the structure of the ZnS:Mn nanocrystals is zinc-blende. From the XRD and TEM results, the size of these narocrystals was estimated at about 3 ~4 nm. From the PL spectra, two emission peaks were observed. One is the orange emission (

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34

Bose, Riya. "Study of photophysical properties of doped/undoped semiconductor and metal nanoparticles and their heterostructures." Thesis, 2019. http://hdl.handle.net/10821/8312.

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Colloidal nanocrystals have been the centre of attraction of materials science research due to the ability of tailoring their properties with size, shape or composition of the same, in comparison to their bulk counterparts. Among these, mostly studied are binary and alloyed binary nanocrystals comprising of group II-VI and III-V materials. CdSe has been the work horse in this area with the emission covering the entire visible region. But the intrinsic toxicity along with the problem of re-absorption and self quenching in many of these binary materials limit their applications in several fields

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35

Lin, Chen-Han. "Nanocrystals Embedded Zirconium-doped Hafnium Oxide High-k Gate Dielectric Films." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-9884.

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Nanocrystals embedded zirconium-doped hafnium oxide (ZrHfO) high-k gate dielectric films have been studied for the applications of the future metal oxide semiconductor field effect transistor (MOSFET) and nonvolatile memory. ZrHfO has excellent gate dielectric properties and can be prepared into MOS structure with a low equivalent oxide thickness (EOT). Ruthenium (Ru) modification effects on the ZrHfO high-k MOS capacitor have been investigated. The bulk and interfacial properties changed with the inclusion of Ru nanoparticles. The permittivity of the ZrHfO film was increased while the energy

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36

Jana, Santanu. "SYNTHESIS, PHOTO-PHYSICAL STUDIES AND APPLICATIONS OF DIFFERENT DOPED AND UNDOPED SEMICONDUCTOR NANOCRYSTALS." Thesis, 2019. http://hdl.handle.net/10821/8314.

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High quality semiconductor nanocrystals (quantum dots, QDs) are small crystal consisting of hundreds to a few thousand atoms each with typical dimension ranging from 1-100 nm which are great interest for fundamental studies and different technological applications such as light emitting devices, lasers, solar cells and biomedical labeing. The quantum mechanical coupling of over hundreds to thousands atoms develops the band structure in semiconductors. In this regime, the spatial confinement of the electronic charge carriers in the nanocrystal leads to a phenomenon known as Quantum Confinement

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37

Hsu, Yi-Husan, and 徐憶瑄. "Synthesis and characterization of near-infrared light triggered lanthanide-doped upconversion nanocrystals." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/08626558123607409893.

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碩士<br>中山醫學大學<br>應用化學系碩士班<br>103<br>This study mainly discusses the synthesis of NaYF4/LiYF4 nanoparticles containing Tm3+/Yb3+. The upconversion efficiency of these nanoparticles correlated to the equivalent of activator or base during the syntheses is also demonstrated. The TEM images of the particles prepared by autoclave under lower temperature show that most of the particles are irregular (AC7 and AC14). In the meantime, the particles could not show the upconversion efficiency under 980 nm excitation. In order to improve the diameter and the upconversion efficiency of the nanoparticles, we

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38

Sabergharesou, Tahereh. "Magnetic and Structural Investigation of Manganese Doped SnO_2 and In_2 O_3 Nanocrystals." Thesis, 2013. http://hdl.handle.net/10012/7874.

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Diluted magnetic semiconductor oxides (DMSOs) have received great attention recently due to their outstanding applications in optoelectronic and spintronic devices. Ever since the initial observation of ferromagnetism at room temperature in cobalt-doped titania, extensive effort is concentrated on preparation of transition metal doped wide band gap semiconductors, especially Mn- doped ZnO. Compared to Mn-doped ZnO, magnetic interactions in SnO! and In!O! semiconductors have been underexplored. SnO! and In!O! semiconductors have many applications, owing to their high charge carrier density and

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39

"Synthesis and characterization of transition-metal-doped zinc oxide nanocrystals for spintronics." Thesis, 2007. http://library.cuhk.edu.hk/record=b6074400.

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A simple bottom-up-based synthetic strategy named a solvothermal technique is introduced as the primary synthetic approach and its crystal growth mechanism is scrutinized. N-type cobalt-doped ZnO-based DMS nanocrystals are employed as a model system, and characterized by a broad spectrum of advanced microscopic and spectroscopic techniques. It is found that the self-orientation growth mechanism, imperfect oriented attachment, is intimately correlated with the high-temperature ferromagnetism via defects. The influence of processing on the magnetic properties, such as compositional variations, r

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40

Lee, Sheng-Kai, and 李勝凱. "Study on CoSi2 nanocrystals in Ge-doped dielectric layer for nonvolatile memory." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/33062508031317007089.

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碩士<br>國立交通大學<br>電子工程系所<br>96<br>In recent years, digital life has attracted great importance for Taiwan，s electronics market. Then he portable electronic products have been applied widely, such as digital cameras, notebooks, hand-carry USB memories, a chip on credit card , PDA, GPS, memory card, MP3 audio players and so on. However, these portable electronic products are based on the nonvolatile memory (NVM) due to the need of low working power and portability. In a conventional nonvolatile memory (NVM), charge is stored in a ploy-silicon floating-gate (FG). However, it suffers some limitation

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41

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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42

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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Ju, Ling. "Synthesis and Investigation on Phase Transition of BaTiO3 and Cr3+-Doped BaTiO3 Nanocrystals." Thesis, 2009. http://hdl.handle.net/10012/4773.

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Various sizes of BaTiO3 and Cr3+-doped BaTiO3 nanocrystals were synthesized through hydrothermal and solvothermal methods. The applied solvents water, ethanol and benzyl alcohol lead to nanoparticles with average sizes of 200, 10 and 5 nm, respectively. The nanocrystals were treated with trioctylphosphine oxide to remove surface-bound dopant ions, and colloidal free-standing nanocrystals smaller than 10 nm were obtained by using oleic acid as a dispersant surfactant. The tetragonal-to-cubic phase transition at room temperature of undoped nanocrystalline BaTiO3 has been investigated by powder X

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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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Zheng, Hairong. "Dynamical process of rare earth ions doped in nanocrystals embedded in amorphous matrices." 2003. http://purl.galileo.usg.edu/uga%5Fetd/zheng%5Fhairong%5F200305%5Fphd.

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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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Wu, Ping-jung, and 巫秉融. "Growth and Characterization of Phosphorus Doped Silicon Nanocrystals Embedded in Silicon Nitride Matrix." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/25193996218502516239.

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博士<br>國立中央大學<br>材料科學與工程研究所<br>101<br>For development of next generation crystalline Si solar cells, one of the new concepts for heterojunction solar cells is using wide bandgap materials as emitter layers due to the higher light transmittance. Silicon nanocrystals (Si-NCs) embedded in a wide bandgap dielectric matrix, such as SiOx, SiNx, and SiCx could be used for this purpose. Moreover, for increasing the conductivity of Si-NCs, incorporating the dopants into Si-NCs has also been demonstrated. So far, the doped Si-NCs in SiOx or SiCx matrix have been used for device fabrication. However, ther

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Chen, Jian-Hao, and 陳建豪. "Studies of photoluminescent properties in Eu-doped Ca(Ti,Zr)O3 provskite nanocrystals." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/2d6p6q.

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碩士<br>國立清華大學<br>物理學系<br>105<br>In this thesis, we discuss the relationship between the changes of perovskite structure of europium-doped Ca(Ti,Zr)O3 and its fluorescence properties. Europium-doped Ca(Ti,Zr)O3 were prepared by a sol-gel method and annealed at 800°C in O2. The structure and particle size were investigated by X-ray powder diffraction (XRD). The XRD results show that the particle size is dependent on the Ti/Zr ratio. The extended x-ray absorption fine structure results show that Zr and Ti are in similar chemical environments. The Eu L3-edge EXAFS result exhibits reduced symmetry

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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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