Bibliographies thématiques / Glass doping

Littérature scientifique sur le sujet « Glass doping »

Auteur : Grafiati
Publié le 11 mars 2023

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Articles de revues sur le sujet "Glass doping"

1

Gao, Zhou, Xing Jiang, Xingbo Wang, Yongji Chen, Jian Liu, Haibiao Chen, Yuan Lin et Feng Pan. « Rare-earth element doping in glass frit for improved performance in silicon solar cells ». Functional Materials Letters 12, no 06 (décembre 2019) : 1950080. http://dx.doi.org/10.1142/s1793604719500802.

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Glass frit plays an important role in the silver paste for silicon solar cells. In this work, we prepare glass frit doped with different rare-earth elements (Y, La, Sm, Er) and study how the doping element affects the performance of the solar cells. Solar cells with La-doped and Sm-doped glass frits show average conversion efficiencies higher than 17.5%, while solar cells with Y-doped or Er-doped frit show lower efficiencies. By analyzing the Raman spectra of the rare-earth doped glass frits, we find that the average coordination number of Te–O ([Formula: see text]) in the glass can be tuned by the rare-earth dopant. La or Sm doping leads to a moderate value of [Formula: see text], which is believed to achieve a glass formation ability that optimizes the structure of the Ag–Si interface of the cell for the best performance.
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2

Filipowski, Wojciech, Kazimierz Drabczyk, Edyta Wróbel, Piotr Sobik, Krzysztof Waczynski et Natalia Waczynska-Niemiec. « Borosilicate spray-on glass solutions for fabrication silicon solar cell back surface field ». Microelectronics International 35, no 3 (2 juillet 2018) : 172–76. http://dx.doi.org/10.1108/mi-12-2017-0075.

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Purpose The purpose of this paper is to develop a method of preparing spray-on dopant solutions that enable obtaining a p+ region forming a back-surface field (BSF) during the diffusion doping process. The spray-on method used allows to decrease the costs of dopant solution application, which is particularly significant for new low-cost production processes. Design/methodology/approach This paper presents steps of production of high concentration boron dopant solutions enabling diffusion doping of crystalline p-type silicon surfaces. To check the fabricated dopant solutions for stability and suitability for spray-on application, their viscosity and density were measured in week-long intervals. The dopant solutions described in this paper were used in a series of diffusion doping processes to confirm their suitability for BSF production. Findings A method of preparing dopant solutions with parameters enabling depositing them on silicon wafers by the spray-on method has been established. Due to hygroscopic properties of the researched dopant solutions, a maximum surrounding atmosphere humidity has been established. The solutions should not be applied by the spray-on method, if this humidity value is exceeded. The conducted derivatographic examination enabled establishing optimal drying conditions. Originality/value The paper presents a new composition of a dopant solution which contains high concentration of boron and may be applied by the spray-on method. Derivatographic examination results, as well as equations describing the relation between dopant solution density and viscosity and storage time are also original for this research. The established dependencies between the sheet resistance of the fabricated BSF and the diffusion doping time are other new elements described in the paper.
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3

Men, H., S. J. Pang et T. Zhang. « Effect of Er doping on glass-forming ability of Co50Cr15Mo14C15B6 alloy ». Journal of Materials Research 21, no 4 (1 avril 2006) : 958–61. http://dx.doi.org/10.1557/jmr.2006.0109.

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Bulk glass formation of the Co–Cr–Mo–C–B–Er alloy system was investigated in this paper. The Co50Cr15Mo14C15B6 (at.%) alloy could be cast into fully glassy rod with a diameter up to 2 mm. By adding 2 at.% Er to this alloy, the critical diameter for glass formation reached 10 mm. The excellent glass formability of the Er-doped alloy was mainly attributed to its relatively large reduced glass transition temperature of 0.61, near-eutectic composition, and the necessity of redistribution of the Er atoms for precipitation of crystalline Co6Mo6C phase in the undercooled liquid on cooling.
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4

Chanthima, Natthakridta, Thanapong Sareein, Yaowaluk Tariwong, Jakrapong Kaewkhao et Narong Sangwaranatee. « Investigations on Luminescence Properties of Ce3+ Ion Doped Bismuth Borophosphate Glasses ». Applied Mechanics and Materials 879 (mars 2018) : 22–26. http://dx.doi.org/10.4028/www.scientific.net/amm.879.22.

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Bismuth borophosphate glasses containing different doping cerium oxide have been synthesized at 1200 °C by melt-quenching technique. The doping concentration of the Ce3+ was varied from 0.05 mol% to 2.0 mol%. The glass samples were characterized through optical absorption and luminescence spectral measurements. UV-visible and near infrared absorption spectra of glass samples were not observed nevertheless the absorption edge was shift to the longer wavelength. The photoluminescence and radioluminescence spectra show emission bands around 367 nm under 317 nm excitation wavelength. Also, the highest emission intensity was found at 0.5 mol% CeF3 dopant for both of photoluminescence and radioluminescence.
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Fernández-Rodríguez, Laura, Rolindes Balda, Joaquín Fernández, Alicia Durán et María Jesús Pascual. « Role of Eu2+ and Dy3+ Concentration in the Persistent Luminescence of Sr2MgSi2O7 Glass-Ceramics ». Materials 15, no 9 (23 avril 2022) : 3068. http://dx.doi.org/10.3390/ma15093068.

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In this study, glass-ceramics based on Sr2MgSi2O7 phosphor co-doped with Eu/Dy were obtained from the sintering and crystallisation of glass powders. The glasses were melted in a gas furnace to simulate an industrial process, and the dopant concentration was varied to optimise the luminescence persistence times. The doped parent glasses showed red emission under UV light excitation due to the doping of Eu3+ ions, while the corresponding glass-ceramics showed persistent blue emission corresponding to the presence of Eu2+ in the crystalline environment. The dopant concentration had a strong impact on the sintering/crystallisation kinetics affecting the final glass-ceramic microstructure. The microstructures and morphology of the crystals responsible for the blue emission were observed by scanning electron microscopy–cathodoluminescence. The composition of the crystallised phases and the distribution of rare-earth (RE) ions in the crystals and in the residual glassy phase were determined by X-ray diffraction and energy dispersive X-ray analysis. The emission and persistence of phosphorescence were studied by photoluminescence.
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6

He, Ming, Shu Ren Zhang, Xiao Hua Zhou, Jian Geng Hu, Ting Zhang et Bo Li. « Dielectric and Sintering Properties of the Doping CaO-B2O3-SiO2 System Low Temperature Co-Fired Ceramics ». Key Engineering Materials 434-435 (mars 2010) : 371–75. http://dx.doi.org/10.4028/www.scientific.net/kem.434-435.371.

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. A doping CaO-B2O3-SiO2 system low temperature co-fired ceramics (LTCC) was prepared with a mixture of high temperature melting glass and sol-gel glass for different ratio. The effects of sol-gel glass content on the microstructure, crystalline phases, sintering properties and dielectric properties of CaO-B2O3-SiO2 system were investigated at 850°C. The results show that the samples with sol-gel glass doping had little change in phase composition, but contained more calcium silicates, and less calcium borate. As the amount of sol-gel glass increased, the shrinkage improved, the sintered density slightly decreased, the dielectric constant (εr) reduced, and the dielectric loss (tgδ) decreased. When the amount of sol-gel glass was 14.5wt%, εr and tgδ of the doping sample were 5.80, 4.6×10-5 (at 1 MHz), respectively. Moreover, the doping system had a good matching ability with gold slurry and Au-Pt-Pd slurry.
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7

Arifin, Ramli, S. Akmar Roslan, M. R. Sahar, S. K. Ghoshal et K. Hamzah. « Thermal and Structural Properties of Erbium/Neodymium Co-Doped Lithium-Magnesium-Tellurite Glass ». Advanced Materials Research 1107 (juin 2015) : 466–70. http://dx.doi.org/10.4028/www.scientific.net/amr.1107.466.

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Detailed characterizations of inorganic glasses via optimized rare earth doping/co-doping are challenging. Tellurite glasses with composition (78-x)TeO2-10Li2O-10MgO-2Nd2O3-xEr2O3, (where x = 0.4 to 2.0 mol%) are prepared by melt-quenching technique. The effects of Er2O3 concentration on the thermal stability and structural properties are examined. The X-ray diffraction pattern confirms the glassy nature of all samples. The temperature of glass transition (Tg), crystallization (Tc), melting (Tm) and the difference (Tc-Tg) are determined by differential thermal analyser (DTA). The values of Tc, Tg and Tm are found to vary in the range of 419-430 °C, 300-345 °C and 885-890 °C, respectively. The glass sample with 0.4 mol% Er2O3 shows highest thermal stability. The FTIR spectra measured in the range of 400 - 4000 cm1 exhibits two major absorption peaks around 1600 - 3600 cm1 and 900 - 1200 cm1 assigned to the stretching vibrational mode of OH and Te-OH respectively. Improvements in the optical and thermal properties due to co-doping may be useful for the development of tellurite glass based photonics.
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8

Liu, Hao, Yongchang Zhu, Jichuan Huo, Zhu Cui, Xingquan Zhang, Qin Jiang, Debo Yang et Baojian Meng. « Effect of P2O5 and Na2O on the Solubility of Molybdenum and Structural Features in Borosilicate Glass ». Materials 15, no 15 (8 août 2022) : 5464. http://dx.doi.org/10.3390/ma15155464.

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In this paper, the effect of doping phosphorus in a borosilicate glass matrix to improve the solubility of Mo was investigated by X-ray diffraction (XRD), Raman, and solid-state nuclear magnetic resonance (NMR) spectroscopy, and the effectiveness of Na content on P species inhibiting the growth of the crystallization of Mo was assessed. The results indicate that phosphate-doped borosilicate glass can host 4 mol% of Mo, and that such a borosilicate glass matrix could only accommodate 1 mol% of Mo without phosphate doping. The effectiveness of phosphorus may be correlated with the Na content in borosilicate glass, and a high Na content borosilicate glass matrix requires more P doping to accommodate Mo. In addition, incorporating large amounts of P can compromise the aqueous durability of the glass matrix.
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9

Gao, Zhigang, Xiaosong Lu, Yushi Chu, Shu Guo, Lu Liu, Yinyao Liu, Shiyu Sun, Jing Ren et Jun Yang. « The distribution of rare earth ions in a γ-Ga2O3 nanocrystal-silicate glass composite and its influence on the photoluminescence properties ». Journal of Materials Chemistry C 6, no 12 (2018) : 2944–50. http://dx.doi.org/10.1039/c8tc00325d.

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The partitioning of rare earth ions (REs: Yb3+, Er3+, Eu3+ and Nd3+) in γ-Ga2O3 nanocrystals (NCs) precipitated in a nanostructured silicate glass ceramic is revealed, and the enrichment of REs in the NCs (bulk doping) rather than on the interfaces between the NCs and the surrounding glassy phase (surface doping) is differentiated.
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10

Xu, Xing Jun, Yun Long Yue, Hai Tao Zhang et Zhao Du. « Effect of MgO on Structure and Properties of CaO-Al2O3-SiO2 Glass System ». Advanced Materials Research 306-307 (août 2011) : 531–34. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.531.

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CaO-Al2O3-SiO2system glasses with MgO were prepared by melt quenching. The glass structure was characterized by Infrared spectra (IR) and Differential Thermal Analysis (DTA). Dielectric properties, devitrification and chemical durability have been studied. IR spectra and DTA indicated that glass network structure change by doping MgO. The glass chemical improved and dielectric constant decreased after doping with MgO. The glass shows a severe tendency of phase separation.
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Thèses sur le sujet "Glass doping"

1

Banyai, William Charles. « Optical nonlinearities in semiconductor doped glass channel waveguides ». Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184505.

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The nonlinear optical properties of a semiconductor-doped glass (SDG) channel waveguide were measured on a picosecond time-scale; namely, fluence-dependent changes in the absorption and the refractive index as well as the relaxation time of the nonlinearity. Slower, thermally-induced changes in the refractive index were also observed. The saturation of the changes in the absorption and the refractive index with increasing optical fluence is explained using a plasma model with bandfilling as the dominant mechanism. The fast relaxation time of the excited electron-hole plasma (20 ps) is explained using a surface-state recombination model. A figure of merit for a nonlinear directional coupler fabricated in a material with a saturable nonlinear refractive index is presented. The measured nonlinear change in the refractive index of the SDG saturates below the value required to effect fluence-dependent switching in a nonlinear directional coupler. Experiments with a channel-waveguide directional coupler support this prediction. However, absorption switching due to differential saturation of the absorption in the two arms of the directional coupler was observed.
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2

Sedani, Salar Habibpur. « Fabrication And Doping Of Thin Crystalline Si Films Prepared By E-beam Evaporation On Glass Substrate ». Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615628/index.pdf.

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In this thesis study, fabrication and doping of silicon thin films prepared by electron beam evaporation equipped with effusion cells for solar cell applications have been investigated. Thin film amorphous Si (a-Si) layers have been fabricated by the electron beam evaporator and simultaneously doped with boron (B) and phosphorous (P) using effusion cells. Samples were prepared on glass substrates for the future solar cell operations. Following the deposition of a-Si thin film, crystallization of the films has been carried out. Solid Phase Crystallization (SPC) and Metal Induced Crystallization (MIC) have been employed to obtain thin film crystalline Si. Crystallization was performed in a conventional tube furnaces and Rapid Thermal annealing systems (RTA) as a function of process parameters such as annealing temperature and duration. Produced films have been characterized using chemical and structural characterization techniques such as Raman Spectroscopy, X-Ray Diffractometer and Secondary Ion Mass Spectrometer (SIMS). The electrical properties of the films have been studied using Hall Effect and I-V measurements as a function of doping. We have demonstrated successful crystallization of a-Si by SPC at temperatures above 600 °
C. The crystallization occurred at lower temperatures in the case of MIC. For doping, P was evaporated from the effusion cell at a temperature between 600 °
C and 800 °
C. For B, the evaporation temperature was 1700 °
C and 1900 °
C. The thickness and the band gap of the Si films were determined by ellipsometry method and the results were compared for different evaporation temperatures. The effect of doping was monitored by the I-V and Hall Effect measurements. We have seen that the doping was accomplished in most of the cases. For the samples annealed at relatively high temperatures, the measured doping type was inconsistent with the expected results. This was attributed to the contamination from the glass substrate. To understand the origin of this contamination, we analyzed the chemical structure of the film and glass by X-ray Fluorescence (XRF) and seen that the glass is the main source of contamination. In order to prevent this contamination we have suggested covering the glass substrate with Si3N4 (Silicon Nitride) which act as a good diffusion barrier for impurities.
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3

Gordo, Vanessa Orsi [UNESP]. « Estudo das propriedades estruturais e ópticas do sistema vítreo 80TeO2-20WO3 dopado com Yb2O3 ». Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/91979.

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Made available in DSpace on 2014-06-11T19:25:33Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-06-28Bitstream added on 2014-06-13T18:28:59Z : No. of bitstreams: 1 gordo_vo_me_ilha.pdf: 1058796 bytes, checksum: 2c8438704796726349dfe606c2595b4b (MD5)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Neste trabalho foi estudado o sistema vítreo (100-x)% (80% TeO2-20% WO3)-(x)% Yb2O3, onde x = 0; 0,1; 0,2; 0,3; 0,4 e 0,5%. As técnicas de difração de raios-X, espectroscopia no infravermelho, espectroscopia Raman e espectroscopia no UV-Vis foram usadas para caracterizar os efeitos da dopagem sobre as propriedades estruturais e ópticas dos vidros estudados. Usando os dados de espectroscopia na região espectral ultravioleta-visível foi possível observar que não houve mudança das freqüências de corte para cada composição e ainda calcular a energia de “gap” e a energia de cauda de Urbach. Usando os dados de fotoluminescência observam-se picos que indicam o desdobramento dos níveis de energia dos estados 2F7/2 e 2F5/2 dos íons de Yb3+. Para os comprimentos de onda de excitação de 514,5 a 488,0 nm, crescem as taxas de absorção do sistema vítreo TW, transferência de carga para o estado 2F5/2 do Yb3+ e da transição radiativa 2F5/2 2F7/2, aumentando, desta forma, a intensidade da fotoluminescência. Já para os comprimentos de onda de excitação 457,9 e 476,5 nm as taxas de absorção do sistema vítreo TW, a transferência de carga para o estado 2F5/2 do Yb3+ e a transição radiativa 2F5/2 2F7/2 são as mesmas e, consequentemente, a intensidade da fotoluminescência é constante.
This work presents the study on the glassy system (100-x)% (80% 20% TeO2-WO3) - (x)% Yb2O3 where x = 0, 0.1, 0.2, 0.3, 0.4 and 0 5%. The techniques of X-ray diffraction, infrared spectroscopy, Raman spectroscopy and UV-Vis were used to characterize the effects of Yb doping on the structural and optical properties of the glasses. Using data from spectroscopy ultraviolet-visible spectral region was observed that there was no change of cutting frequencies for each compound and were calculate the energy gap and Urbach tail energy. Using the data of photoluminescence peak is observed indicating the splitting of energy levels of states 2F7/2 and 2F5/2 of Yb3+ ions. The rate of electron transition probability is influenced by temperature. To the excitation wavelength of 514.5 to 488.0 nm, growing rates of absorption of the glass system TW, charge transfer to the state 2F5/2 of Yb3+ and the radiative transition 2F5/2 2F7/2, increasing thus the photoluminescence intensity. As for the excitation wavelength of 476.5 and 457.9 nm absorption rates of the TW glass system, the charge transfer state to the 2F5/2 of Yb3+ and the radiative transition 2F5/2 2F7/2 are the same and, hence the photoluminescence intensity is constant.
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4

Hubert, Mathieu. « Chalcogenide Glasses for Infrared Applications : New Synthesis Routes and Rare Earth Doping ». Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/223357.

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Chalcogenide glasses and glass-ceramics present a high interest for the production of thermal imaging lenses transparent in the 3-5 μm and 8-12 μm windows. However, chalcogenide glasses are conventionally synthesized in sealed silica ampoules which have two major drawbacks. First, the low thermal conductivity of silica limits the sample dimensions and second the silica tubes employed are single use and expensive, and represent up to 30% of the final cost of the material. The present work therefore addresses the development of innovative synthesis methods for chalcogenide glass and glass-ceramics that can present an alternative to the silica tube route. The method investigated involves melting the raw starting elements in reusable silica containers. This method is suitable for the synthesis of stable chalcogenide glasses compositions such as GeSe₄ but uncontrolled crystallization and homogenization problems are experienced for less stable compositions. The second approach involves preparation of amorphous chalcogenide powders by ball milling of raw elements. This mechanosynthesis step is followed by consolidation of the resulting powders to produce bulk glasses. Hot Uniaxial Pressing is suitable for compositions stable against crystallization. However, uncontrolled crystallization occurs for the unstable 80GeSe₂-20Ga₂Se₃ glass composition. In contrast consolidation through Spark Plasma Sintering (SPS) allows production of bulk glasses in a short duration at relatively low temperatures and is appropriate for the synthesis of unstable glasses. A sintering stage of only 2 min at 390°C is shown to be sufficient to obtain infrared transparent 80GeSe₂-20Ga₂Se₃ bulk glasses. This method enables the production of lenses with a 4-fold increase in diameter in comparison to those obtained by melt/quenching technique. Moreover, increasing the SPS treatment duration yielded infrared transparent glass-ceramics with enhanced mechanical properties. This innovative synthesis method combining mechanosynthesis and SPS has been patented in the framework if this study. The controlled etching of 80GeSe₂-20Ga₂Se₃ glass-ceramics in acid solution yields nanoporous materials with enhanced surface area. The porous layer created on the surface of the glass-ceramic is shown to play the role of anti-reflection coating and increase the optical transmission in the infrared range by up to 10%. These materials may have potential for the production of sensors with increased sensitivity in the infrared. The influence of indium and lead addition on the thermal and optical properties of the 80GeSe₂-20Ga₂Se₃ glass has also been assessed. Increased In or Pb contents tend to decrease the Tg of the glasses and shift the optical band gap toward higher wavelengths. A systematic ceramization study emphasizes the difficulty of controlling the crystallization for glasses in the systems GeSe₂-Ga₂Se₃-In₂Se₃ and GeSe₂-Ga₂Se₃-PbSe. No crystallization of the In₂Se₃ and PbSe crystalline phase was obtained. Finally, the possibility of producing rare-earth doped 80GeSe₂-20Ga₂Se₃ glass-ceramics transparent in the infrared region up to 16 μm is demonstrated. Enhanced photoluminescence intensity and reduced radiative lifetimes are observed with increased crystallinity in these materials.
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5

Rajbhandari, Prashant. « Advanced NMR characterization of the effect of Al2O3, B2O3 and SiO2 doping on low-Tg phosphate based glass ». Thesis, Lille 1, 2013. http://www.theses.fr/2013LIL10069/document.

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Les verres de phosphates à faible Tg et forte stabilité thermique sont étudié dans le système (66-x)ZnO- xNa2O-33.4 P2O5. Les mesures DSC ont montré un écart Tx-Tg de 197 °C et une Tg de 339 °C pour x= 20. La RMN 31P 1D/2D révèle la diminution du désordre due à la substitution progressive de Zn par Na. Les formulations x=20 et x=33 ont été dopé par de l’Al2O3, B2O3 et SiO2 (1-4 % mol.) et ses effets sur les propriétés physiques comme la température de transition vitreuse, la stabilité thermique et la durabilité chimique ont été investiguées. La DRX et la RMN 31P ont été réalisés pour suivre le processus de cristallisation en isotherme à 130°C (au-delà de la Tg). La plus forte stabilité thermique a été identifiée pour les verres dopés au bore. Le Raman et la RMN 31P ont mis en évidence l’existence de connections P-O-X (X=27Al ou 11B). La RMN a entre autre montré la coordinence majoritaire VI, IV et IV respectivement pour l’aluminium, le bore et la silice. L’utilisation de D-INEPT, REDOR et DQ-SQ permet d’approfondir nos connaissances sur la structure particulièrement sur les connectivités P-O-X mais également la diversité des connections possibles
Pyrophosphate glass with low Tg and high stability is investigated within the (66-x) ZnO- xNa2O-33.4 P2O5 system. DSC measurement indicated Tx-Tg=197 °C with Tg = 339 °C at x= 20. 1D/2D 31P NMR revealed the decrease in extent of disorder with the progressive substitution of Zn by Na. The x=20 and x=33 formulations were doped with (1-4 mol.%) of Al2O3, B2O3 and SiO2 and its effect on the physical properties such as the glass transition temperature, thermal stability and chemical durability is investigated. XRD and 1D 31P solid state NMR were used to monitor the isothermal crystallization process occurring at 130 °C above Tg and the highest thermal stability is presented by the B-doped glasses. Raman and 31P NMR suggested the existence of P-O-X (X=27Al or 11B) bonds. The MAS NMR distinguished the dominant coordination states of doping elements AlVI , BIV and SiIV respectively. The use of D-INEPT, REDOR and DQ-SQ helped in producing deeper insights onto the glass structure about the P-O-X connectivity, the wide range of phosphate speciation
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6

Gordo, Vanessa Orsi. « Estudo das propriedades estruturais e ópticas do sistema vítreo 80TeO2-20WO3 dopado com Yb2O3 / ». Ilha Solteira : [s.n.], 2010. http://hdl.handle.net/11449/91979.

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Orientador: Keizo Yukimitu
Banca: José Brás Barreto Oliveira
Banca: Noelio Oliveira Dantas
Resumo: Neste trabalho foi estudado o sistema vítreo (100-x)% (80% TeO2-20% WO3)-(x)% Yb2O3, onde x = 0; 0,1; 0,2; 0,3; 0,4 e 0,5%. As técnicas de difração de raios-X, espectroscopia no infravermelho, espectroscopia Raman e espectroscopia no UV-Vis foram usadas para caracterizar os efeitos da dopagem sobre as propriedades estruturais e ópticas dos vidros estudados. Usando os dados de espectroscopia na região espectral ultravioleta-visível foi possível observar que não houve mudança das freqüências de corte para cada composição e ainda calcular a energia de "gap" e a energia de cauda de Urbach. Usando os dados de fotoluminescência observam-se picos que indicam o desdobramento dos níveis de energia dos estados 2F7/2 e 2F5/2 dos íons de Yb3+. Para os comprimentos de onda de excitação de 514,5 a 488,0 nm, crescem as taxas de absorção do sistema vítreo TW, transferência de carga para o estado 2F5/2 do Yb3+ e da transição radiativa 2F5/2 2F7/2, aumentando, desta forma, a intensidade da fotoluminescência. Já para os comprimentos de onda de excitação 457,9 e 476,5 nm as taxas de absorção do sistema vítreo TW, a transferência de carga para o estado 2F5/2 do Yb3+ e a transição radiativa 2F5/2 2F7/2 são as mesmas e, consequentemente, a intensidade da fotoluminescência é constante.
Abstract: This work presents the study on the glassy system (100-x)% (80% 20% TeO2-WO3) - (x)% Yb2O3 where x = 0, 0.1, 0.2, 0.3, 0.4 and 0 5%. The techniques of X-ray diffraction, infrared spectroscopy, Raman spectroscopy and UV-Vis were used to characterize the effects of Yb doping on the structural and optical properties of the glasses. Using data from spectroscopy ultraviolet-visible spectral region was observed that there was no change of cutting frequencies for each compound and were calculate the energy gap and Urbach tail energy. Using the data of photoluminescence peak is observed indicating the splitting of energy levels of states 2F7/2 and 2F5/2 of Yb3+ ions. The rate of electron transition probability is influenced by temperature. To the excitation wavelength of 514.5 to 488.0 nm, growing rates of absorption of the glass system TW, charge transfer to the state 2F5/2 of Yb3+ and the radiative transition 2F5/2 2F7/2, increasing thus the photoluminescence intensity. As for the excitation wavelength of 476.5 and 457.9 nm absorption rates of the TW glass system, the charge transfer state to the 2F5/2 of Yb3+ and the radiative transition 2F5/2 2F7/2 are the same and, hence the photoluminescence intensity is constant.
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7

Paradisi, Andrea. « Ultra-high carrier modulation in two dimensions through space charge doping : graphene and zinc oxide ». Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066297/document.

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La modulation de la densité de charge est un aspect important de l'étude de les transitions de phase électroniques ainsi que des propriétés électroniques des matériaux et il est à la base de plusieurs applications dans la micro-électronique. L'ajustement de la densité des porteurs de charge (dopage) peut être fait par voie chimique, en ajoutant des atomes étrangers au réseau cristallin du matériau ou électrostatiquement, en créant un accumulation de charge comme dans un Transistor é Effet de Champ. Cette dernier m ethode est réversible et particuliérement appropriée pour les matériaux bidimensionnels (2D) ou pour des couches ultra-minces. Le Dopage par Charge d'Espace est une nouvelle technique inventée et développée au cours de ce travail de thèse pour le dopage electrostatique de matériaux déposés sur la surface du verre. Une charge d'espace est créée à la surface en provoquant le mouvement des ions sodium présents dans le verre sous l'effet de la chaleur et d'un champ électrique extérieur. Cette espace de charge induit une accumulation de charge dans le matériau déposé sur la surface du verre, ce qui peut être supérieure à 10^14/cm^2. Une caractérisation détaillée faite avec mesures de transport, effet Hall, mesures Raman et mesures de Microscopie a Force Atomique (AFM) montrent que le dopage est réversible, bipolaire et il ne provoque pas des modifications chimiques. Cette technique peut être appliquée a des grandes surfaces, comme il est montré pour le cas du graph ene CVD. Dans une deuxiéme partie le dopage par espace de charge est appliqué à des couches ultra-minces (< 40 nm) de ZnO_(1-x). Le résultat est un abaissement de la résistance par carré de 5 ordres de grandeur. Les mesures de magnéto-transport faites à basse température montrent que les électrons dop es sont confinés en deux dimensions. Une transition remarquable de la localisation faible à l'anti-localisation est observée en fonction du dopage et de la température et des conclusions sont tirées à propos des phénoménes de diffusion qui gouverne le transport électronique dans des diff erentes conditions dans ce matériau
Carrier modulation is an important parameter in the study of the electronic phase transitions and the electronic properties of materials and at the basis for many applications in microelectronics. The tuning of charge carrier density (doping) can be achieved chemically, by adding foreign atoms to the crystal structure of the material or electrostatically, by inducing a charge accumulation like in a Field Eect Transistor device. The latter method is reversible and particularly indicated for use in two dimensional (2D) materials or ultra-thin films. Space Charge Doping is a new technique invented and developed during this thesis for the electrostatic doping of such materials deposited on a glass surface. A space charge is created at the surface by causing sodium ions contained in glass to drift under the Eect of heat and an external electric field. This space charge in turn induces a charge accumulation in the material deposited on the glass surface which can be higher than 10^14/cm^2. Detailed characterization using transport, Hall effect, Raman and AFM measurements shows that the doping is reversible, ambipolar and does not induce chemical changes. It can be applied to large areas as shown with CVD graphene. In a second phase the space charge doping method is applied to polycrystalline ultra-thin films (< 40 nm) of ZnO_(1-x). A lowering of sheet resistance over 5 orders of magnitude is obtained. Low temperature magneto-transport measurements reveal that doped electrons are confined in two dimensions. A remarkable transition between weak localization and anti-localization isobserved as a function of doping and temperature and conclusions are drawn concerning the scattering phenomena governing electronic transport under different conditions in this material
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Chanda, Sheetal Kumar. « Copper doped window layer for CdSe solar cells ». [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002794.

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Acharya, Krishna Prasad. « Photocurrent Spectroscopy of CdS/Plastic, CdS/Glass, and ZnTe/GaAs Hetero-pairs Formed with Pulsed-laser Deposition ». Bowling Green State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1245089031.

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Bossard, Cédric. « Elaboration et caractérisation d’un hybride organominéral à base de polycaprolactone et de bioverre sous forme de mousse macroporeuse pour la régénération osseuse ». Thesis, Université Clermont Auvergne‎ (2017-2020), 2018. http://www.theses.fr/2018CLFAC068/document.

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L’accroissement de l’espérance de vie s’accompagne d’une détérioration de l’état de santé général des seniors et d’une recrudescence des maladies chroniques. Parmi les manifestations de la sénescence, l’atteinte de l’appareil locomoteur est particulièrement invalidante et accélère considérablement l’entrée en dépendance. C’est également le cas chez les plus jeunes lors d’atteintes traumatiques ou pathologiques. Ainsi, au niveau mondial 2,2 millions de greffes osseuses sont pratiquées chaque année, mais le taux de complications post-opératoires demeure élevé et est estimé à 15 % des interventions. Ces faits dessinent les contours d’un enjeu sociétal majeur ; les matériaux d’origine animale posent des problèmes d’histocompatibilité, de pathogénicité et donc de rejet. C’est pourquoi les efforts de recherche ciblent prioritairement le développement de biomatériaux synthétiques aptes à promouvoir la régénération osseuse. Actuellement les principaux substituts osseux sur le marché sont les « céramiques » bioactives (phosphates de calcium, verres bioactifs) qui présentent comme caractéristiques d’être biocompatibles, de se lier spontanément aux tissus osseux, de promouvoir l’adhésion des cellules osseuses et enfin d’être biorésorbables. Cependant, malgré cet ensemble de caractéristiques très satisfaisantes, la fragilité de ces matériaux en limite les applications. Pour pallier ce défaut, une solution ingénieuse est de s’inspirer de la structure particulière du tissu osseux. Celle-ci mêle intimement une phase inorganique, le minéral osseux constitué de cristaux d’apatite (phosphate de calcium résorbable), à une phase organique qui est majoritairement du collagène. De manière remarquable, une telle structure associe la rigidité de la partie inorganique à la ténacité des fibres de collagène. Pour obtenir des implants aux propriétés mécaniques proches du tissu osseux, la stratégie consiste donc à combiner céramiques bioactives et matière organique. À cette fin, l’équipe Biomatériaux du Laboratoire de Physique de Clermont (LPC) a récemment mis au point un procédé innovant qui permet la synthèse de matrices tridimensionnelles d’hybrides organique-inorganique à base de verre bioactif et de polymère biocompatible aux caractéristiques variées. Dans la continuité des travaux, il était alors question d’exploiter ce procédé afin de développer un substitut osseux hybride aux propriétés optimisées. Il s’agissait tout d’abord de sélectionner le polymère le plus adéquat pour la régénération osseuse, qui s’est avéré être le polycaprolactone, puis d’optimiser la synthèse (notamment la source de calcium), la structure macroporeuse et la proportion organique-inorganique. Le matériau hybride résultant a ensuite été dopé en éléments thérapeutiques à faible dose (< 5 % de la masse totale) avec des ions strontium ou des nutriments tels que la fisétine et l’hydroxytyrosol qui possèdent un effet ostéogénique. Les mousses hybrides ainsi développées ont finalement été caractérisées in vitro afin de déterminer leurs propriétés physico-chimiques et biologiques, et in vivo afin d’évaluer leur performance. Après 3 mois d’implantation dans un défaut critique de la calvaria de souris, les résultats démontrent le potentiel de ce substitut osseux: comparé au matériau commercial de référence (os bovin traité) qui conduit à une reconstruction osseuse de 16% (± 5%), l’hybride permet une reconstruction allant de 32% (± 3%) lorsqu’il n’est pas dopé, jusqu’à 55% (± 7%) voire 58% (± 7%) lorsqu’il est dopé respectivement en fisétine ou en strontium. Ces travaux de thèse laissent entrevoir des perspectives prometteuses telles que l’association des dopants et l’impression 3D des mousses hybrides polycaprolactone-verre bioactif
The increase in life expectancy results in the decline of seniors’ health conditions and the resurgence of chronic diseases. Among the expressions of senescence, disorders of the musculoskeletal system are particularly disabling and considerably accelerate the state of dependency. This is also the case for young people who suffer from traumatic injuries or pathologic conditions. Thus, about 2.2 million bone grafts are performed worldwide every year. Yet, the level of postoperative complications remains high and is estimated at 15% of surgical operations. These facts outline a major societal concern: animal-based materials present a risk of histocompatibility issues and pathogenicity that may lead to implant failure. This is the reason why research efforts focus on the development of synthetic biomaterials capable of promoting bone regeneration. Currently, commercialised bone substitutes are mainly made of bioactive “ceramics” (calcium phosphates, bioactive glass) that are known to be biocompatible, to spontaneously bond to bone tissues, to promote bone cell adhesion and finally to be bioresorbable. However, despite these remarkable properties, the brittleness of these materials limits their applications. An ingenious solution to this brittleness can be learned from the particular structure of bone tissue. Bone tissue intimately blends an inorganic phase, the bone mineral, which is made of apatite crystals (resorbable calcium phosphates), with an organic phase that is mainly collagen. Such a structure associates the stiffness of the inorganic part with the toughness of collagen fibres. Therefore, in order to obtain implants with mechanical properties similar to that of bone, the strategy consists in combining bioactive ceramics with organic matter. To this end, the Biomatériaux team from the Laboratoire de Physique de Clermont (LPC) recently developed an innovative process that allows the synthesis of tridimensional organic-inorganic hybrids comprised of bioactive glass and biocompatible polymer. The objective of the thesis was to exploit this process in order to develop a hybrid bone substitute with optimal properties. First of all, polycaprolactone was selected as the polymer, especially because of its adequate degradation rate for long-term applications such as bone regeneration. Then, the synthesis process was improved (in particular, the calcium source was changed), the macroporous structure was optimised and the organic-inorganic ratio was chosen. Afterwards, elements that are known to induce an osteogenic effect were incorporated in the hybrid at low doses (< 5% of total weight): an inorganic doping was performed using strontium ions and an organic doping was performed using nutrients such as fisetin or hydroxytyrosol. The resultant hybrid scaffolds were eventually characterised in vitro in order to determine their physicochemical and biological properties and in vivo in order to evaluate their performance. After 3 months of implantation in a mouse calvarial critical defect, results demonstrate the potential of this bone substitute: compared to the reference commercial material (treated bovine bone) that leads to a bone reconstruction of 16% (± 5%), the hybrid allows a reconstruction going from 32% (± 3%) when it is not doped, to 55% (± 7%) and even 58% (± 7%) when it is doped respectively with fisetin or strontium. This thesis paves the way to promising perspectives like the association of doping agents and the 3D printing of polycaprolactone-bioactive glass hybrid scaffolds
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Livres sur le sujet "Glass doping"

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F, Kelton K., Ray C. S et United States. National Aeronautics and Space Administration., dir. Effect of Pt doping on nucleation and crystallization in Li₂O.2SiO₂ glass : Experimental measurements and computer modeling. 2e éd. [Amsterdam : North-Holland, 1996.

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Effect of Pt doping on nucleation and crystallization in Li₂O.2SiO₂ glass : Experimental measurements and computer modeling. 2e éd. [Amsterdam : North-Holland, 1996.

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Chapitres de livres sur le sujet "Glass doping"

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Morse, T. F., A. Kilian et L. Reinhart. « A High Temperature Sol-Gel Process for Glass Formation : Aerosol Doping in Modified Chemical Vapor Deposition ». Dans Sol-Gel Optics, 159–68. Boston, MA : Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2750-3_7.

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Jiménez, José A., et Logan Haney. « Investigation of the Influence of CuO and SnO Doping on the Luminescence of Dy3+ Ions in Phosphate Glass ». Dans Developments in Strategic Materials and Computational Design V, 313–22. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119040293.ch27.

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Matyáš, J., J. E. Amonette, R. K. Kukkadapu, D. Schreiber et A. A. Kruger. « The Effects of Glass Doping, Temperature and Time on the Morphology, Composition, and Iron Redox of Spinel Crystals ». Dans Ceramic Transactions Series, 147–56. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118996652.ch14.

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Abkowitz, Martin A. « Changes in the Photoelectronic Properties of Glassy Chalcogenides Induced by Chemical Doping, Irradiation, and Thermal History ». Dans Disordered Semiconductors, 205–17. Boston, MA : Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1841-5_24.

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N. Oliver, Joy-anne, Olanrewaju Akande et Melanie Ecker. « Incorporation of Novel Elements in Bioactive Glass Compositions to Enhance Implant Performance ». Dans Current Concepts in Dental Implantology - From Science to Clinical Research [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99430.

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Increasing popularities of bioactive-glasses and their potential medical applications have led to countless studies into improving their material characteristics and overall performance. Some scientists hope to create new bioactive-glass compositions, while others seek to merely modify existing ones such as the novel 45S5 bioactive-glass composition; created by Dr. Larry Hench. These modifications aim to address potential complications that may arise at a site following implantation such as bacterial infections. In other cases, the incorporation of a selected element or compound may aim to improve the implant functioning by increasing cell proliferation. Although possibilities are plentiful, researchers avoid compromising the typical bioactive glass characteristics when doping with elements such as silver, or gold to achieve additional properties. This chapter elaborates on the incorporation of popular elements by doping bioactive-glass compositions to introduce desired properties based on the implant application.
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Karmakar, Basudeb. « Functionalization of glasses by 3d transition metal ion doping ». Dans Functional Glasses and Glass-Ceramics, 25–64. Elsevier, 2017. http://dx.doi.org/10.1016/b978-0-12-805056-9.00002-7.

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Karmakar, Basudeb. « Functionalization of glasses by 4f rare-earth metal ion doping ». Dans Functional Glasses and Glass-Ceramics, 65–117. Elsevier, 2017. http://dx.doi.org/10.1016/b978-0-12-805056-9.00003-9.

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C.A. Silva, Anielle, Jerusa M. de Oliveira, Luciana R.S. Floresta, Matheus V. da Silva, José L. da S. Duarte, Karolina B. da Silva, Eurípedes A. da Silva Filho et al. « Transition Metals Doped Nanocrystals : Synthesis, Characterization, and Applications ». Dans Transition Metal Compounds - Synthesis, Properties, and Application. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97326.

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Doping is a technique that makes it possible to incorporate substitutional ions into the crystalline structure of materials, generating exciting properties. This book chapter will comment on the transition metals (TM) doped nanocrystals (NCs) and how doping and concentration influence applications and biocompatibility. In the NCs doped with TM, there is a strong interaction of sp-d exchange between the NCs’ charge carriers and the unpaired electrons of the MT, generating new and exciting properties. These doped NCs can be nanopowders or be embedded in glass matrices, depending on the application of interest. Therefore, we show the group results of synthesis, characterization, and applications of iron or copper-doped ZnO nanopowders and chromium-doped Bi2S3, nickel-doped ZnTe, and manganese-doped CdTe quantum dots in the glass matrices.
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Malchukova, Eugenia. « Influence of the Doping Ion Nature and Content on Defect Creation Processes under the Effect of Ionizing Radiation in Aluminoborosilicate Glasses ». Dans Recent Techniques and Applications in Ionizing Radiation Research. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.92317.

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Effects of ionizing irradiation on defect creation processes have been studied in rare earth (RE)-doped (RE = Sm, Gd, Eu, Ce, Nd) aluminoborosilicate glass with use of the electron paramagnetic resonance (EPR) and optical spectroscopy. As a function of RE ion nature, we observe that doping significantly influences the nature of the defects produced during irradiation and more specifically the relative proportions between hole and electron defect centers. Strong decrease of defect production efficiency under ionizing radiation independence on both the RE doping content and on the relative stability of the RE different oxidation states is also clearly revealed. The results could be explained by dynamical reversible trapping of the electron-hole pairs produced during irradiation on the different RE charge states as well as by RE segregation and pre-existing defects speciation in ABS glass structure.
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Baturay, Şilan, et Canan Aytuğ Ava. « Al Doping Influence on Structural, Morphological and Optical Properties of CuO Films ». Dans Versatile Approaches to Engineering and Applied Sciences : Materials and Methods. Özgür Yayınları, 2023. http://dx.doi.org/10.58830/ozgur.pub50.c45.

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In this study, CuO nanostructured films conjunction with metal doping have been deposited onto soda lime glass (SLG) substrate by method of spin coating at different doping concentration in solution (0%, 2% and 4%). X-ray diffraction (XRD) patterns for copper oxide films conjunction with Al doping demonstrated that the films have polycrystalline structure and have preferential growth in (-111) and (200) directions. Calculated dislocation density value of (-111) plane is changed between 3.7 x 1014 and 5.83 x 1014 m-2 and 83.7 x 1014 and 50.6 x 1014 m-2 for (200) owing to the expansion of structural parameters with Al dopant content in solution. In order to investigate surface morphology, we used an atomic force microscopy (AFM). The obtained results from AFM revealed that samples are comparatively smooth in the valley area while many crystals-like structures are seen in the hill area. In order to examine absorbance, energy band gap and transmittance value of Al doped CuO films, we used a UV-Vis measurements system in the range of 1100-300 nm at temperature of 273 K. The obtained samples have high absorption in the region of UV-Vis and have a high affinity for UV light. It can be said that the change in the absorption value is a result of the different crystal nature of the samples. Energy band gap value of Al:CuO thin films changed between 1.98 and 2.07 eV.
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Actes de conférences sur le sujet "Glass doping"

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Stanford, N. A., K. J. Malone, D. R. Larson et M. J. McCollum. « Rare earth-doped glass integrated optics : lasers and amplifiers ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.mll1.

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The rare earth-doping of planar and channel glass waveguide structures is evolving into a new device technology that is distinct from rare earth-doping fibers. This is particularly true since the VLSI processing techniques used for waveguide fabrication permit selective doping and formation of complex optical circuits. Such geometry-specific doping is important, for example, in making passive feed waveguides that direct laser diode pump light to active areas of the device. Dopants such as Nd, Er, Pr, Yb, and Ho permit a wide range of operating wavelengths. Green up-conversion lasers should be feasible with Ho as a dopant. Nd will provide laser action near 1060 nm and 1300 nm. Er enables amplification and lasing near 1500 nm. Pr has several lasing transitions through the visible red to near infrared. Some of the many potential uses for this technology include optical data storage read/write, super-luminescent sources for optical gyros, amplifying fan-out structures for distribution networks, compact single frequency lasers, and eye-safe lasers.
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Sadeh, Sepehr, et Kunal Mitra. « Laser Induced Implantation Doping of Glass Substrates ». Dans ASME 2016 Heat Transfer Summer Conference collocated with the ASME 2016 Fluids Engineering Division Summer Meeting and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ht2016-7402.

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Lasers are widely used as high-accuracy tools for material processing. Different types of lasers such as CO2, Nd:YAG, and excimer lasers are used in different operating modes such as continuous wave, pulsed or Q-switched. Volumes of materials and their composition, structure, and properties can be controlled or modified by varying laser pulses. In this research, by using laser as a material processing tool, an experimental method was developed for laser induced implantation doping of glass substrates with conductive metals. Experiments were performed on glass samples using Q-switched Nd:YAG lasers. Gold, silver, and copper were used as conductive dopant materials. Initial experiments were performed using nickel as a catalyst. Effect of the catalyst on the composition of implanted dopant material was observed using Large Area Rapid Imaging Analytical Tool (LARIAT). Through further experiment, the effect of several parameters such as beam fluence, scanning speed, pulse repetition frequency, wavelength, substrate temperature, dopant material, and glass substrate material on the morphology of heat affected zones were investigated by optical microscopy (OM). Depth of penetration in doped glass samples was measured for different substrate temperatures by means of a laser displacement sensor. The effect of beam fluence and glass substrate thickness on depth of penetration was investigated. The results of these non-destructive measurements were verified using scanning electron microscopy (SEM). Based on optical observations, morphological characteristics of the heat affected zone were assessed in order to obtain the best parameter settings in different experiments. These settings were defined by factors such as the number and size of cracks in glass substrates, and the quality of the distribution of dopant metal over the scanned pattern. While using a catalyst with substrates at room temperature, the best parameter settings were obtained at wavelength of 532 nm, pulse repetition frequency of 6 kHz, beam fluence of 0.36 J/cm2, and scanning speed of 0.10 m/s. By removing the catalyst, these settings were changed to 355 nm, 10 kHz, 0.09 J/cm2, and 0.01 m/s for gold sputtered soda-lime glass substrate at 500 °C. For beam fluence values ranging from 0.06 J/cm2 to 0.38 J/cm2, the obtained values for average depth of penetration were 255 μm and 187 μm in 1 mm and 3 mm thick soda-lime glass substrates respectively. Further development of this implantation method could lead to implantation of electronic circuits in transparent substrates, inspiring the evolution of transparent electronic devices such as transparent smart phones, smart windows and displays, and lighting products in the future.
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Wang, Ji, Stuart Gray, Donnell T. Walton, Ming-jun Li, Xin Chen, An-ping Liu et Luis A. Zenteno. « Advanced vapor-doping all-glass double-clad fibers ». Dans Integrated Optoelectronic Devices 2008, sous la direction de Michel J. F. Digonnet, Shibin Jiang, John W. Glesener et J. Christopher Dries. SPIE, 2008. http://dx.doi.org/10.1117/12.770688.

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Roy, B., et S. Das. « Doping effects of Cr in cluster glass La0.5Sr0.5CoO3 ». Dans SOLID STATE PHYSICS : Proceedings of the 56th DAE Solid State Physics Symposium 2011. AIP, 2012. http://dx.doi.org/10.1063/1.4710391.

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Nakamura, K., et T. Tamaki. « Doping method to glass material using a CO2laser ». Dans SPIE MOEMS-MEMS, sous la direction de Mary Ann Maher et Paul J. Resnick. SPIE, 2013. http://dx.doi.org/10.1117/12.2005463.

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KAMADA, KAI, SHINTARO UDO et YASUMICHI MATSUMOTO. « CATION DOPING INTO THE SODIUM BORATE GLASS USING THE SOLID OXIDE ELECTROCHEMICAL DOPING METHOD ». Dans Proceedings of the 7th Asian Conference. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812791979_0030.

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He, Chuan, Lin Chen, David Wei Zhang, Junhua Hong, Guangyao Jin, Jin Zhang, Jeff Boeker et al. « FinFET doping with PSG/BSG glass mimic doping by ultra low energy ion implantation ». Dans 2016 16th International Workshop on Junction Technology (IWJT). IEEE, 2016. http://dx.doi.org/10.1109/iwjt.2016.7486675.

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Dorosz, Dominik, Marcin Kochanowicz, Magdalena Lesniak, Robert Müller, Martin Lorenz, Jens Kobelke, Katrin Wondraczek et al. « Glass powder doping of nanocrystal-doped fibres : challenges and results ». Dans Fiber Lasers and Glass Photonics : Materials through Applications III, sous la direction de Stefano Taccheo, Maurizio Ferrari et Angela B. Seddon. SPIE, 2022. http://dx.doi.org/10.1117/12.2624448.

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Imai, Hiroaki, Suguru Horinouchi, Naoko Asakuma, Kazuhiro Fukao, Daizaburo Matsuki, Hiroshi Hiroshima et Keisuke Sasaki. « Effects of doping of H2O and Na on second-order nonlinearity in poled silica glass ». Dans Bragg Gratings, Photosensitivity, and Poling in Glass Fibers and Waveguides. Washington, D.C. : Optica Publishing Group, 1997. http://dx.doi.org/10.1364/bgppf.1997.bmg.6.

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Large second-order nonlinearity was reported to be induced in the near-surface region of commercial fused silica1 and in the whole region of sol-gel derived silica glass2 by thermal poling. The origin of the nonlinearity was suggested to be diffusion of Na+ for the former and OH groups for the later. To control the nonlinearity of silica glass and clarify the effects of the impurities, we investigated second harmonic generation (SHG) from silica glass doped with H2O and Na.
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Picard, Françis, Hubert Jerominek et Réal Tremblay. « GaAs microcrystallites-doped glass : preliminary results ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.thy61.

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A new type of semiconductor microcrystallites-doped glass has been fabricated by ion beam sputtering of GaAs/glass composite targets. The deposition of such a material was a preliminary step toward the fabrication of semiconductor doped glass, which would demonstrate large optical nonlinearities at wavelengths compatible with the emission wavelengths of solid-state lasers and laser diodes. GaAs, which is known to exhibit large optcial nonlinearities at the wavelengths close to the material bandgap (870 nm), was then selected as the doping semiconductor. Physical properties and characteristics of the deposited thin films were studied by electron spectroscopy for chemical analysis (ESCA) and Raman spectroscopy. Results of ESCA demonstrated that concentration of the doping semiconductor is relatively high, at least on the sample surface. Identification of the Ga and As compounds present in the films were also performed using ESCA. In particular, GaAs, Ga2CO3 and AS2O3 were found on the surface of the samples while only GaAs was present in the core of the films. Raman spectroscopy studies lead to detection of the characteristic GaAs phonon peaks in the films. This demonstrates that the GaAs microcrystallites are present in the fabricated films. Finally, real and imaginary parts of the complex refractive index of the films were determined using optical ellipsometry technique.
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