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Slides of invited talk on ALD for MEMS at the AVS-ALD conference ALD 2009 Monterey, California, USA --- Full reference: R. L. Puurunen, M. Blomberg, H. Kattelus, ALD layer in MEMS fabrication, 9th International Conference on Atomic Layer Deposition “ALD 2009”, Monterey, California, July 19-22, 2009. Invited talk.
Puurunen invited lecture AVS-ALD 2009 090719
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We described the positive (trapping and energy storage) and negative (trap depletion) effects of exciting persistent or glow-in-the-dark phosphors, by combining experimental input and modelling. The trapping process is clearly more dynamic and non-linear than previously realised. Talk presented at the PRE'16 conference on the photoluminescence of rare earth ions, organized by Clemson U in Greenville, South Carolina, US (June 8-10, 2016)
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Optical detrapping is a major loss mechanism for the storage capacity of persistent phosphors. By combining dual wavelength excitation, thermoluminescence and numerical simulations, the influence of optical detrapping on the charging and decharging of persistent phosphors is investigated.
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We described the positive (trapping and energy storage) and negative (trap depletion) effects of exciting persistent or glow-in-the-dark phosphors, by combining experimental input and modelling. The trapping process is clearly more dynamic and non-linear than previously realised. Talk presented at the PRE'16 conference on the photoluminescence of rare earth ions, organized by Clemson U in Greenville, South Carolina, US (June 8-10, 2016)
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Examples of SEM-CL in combination with EDX, for use in phosphor research. From phosphor evaluation at the microscopic scale to single particle analysis
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Optical detrapping is a major loss mechanism for the storage capacity of persistent phosphors. By combining dual wavelength excitation, thermoluminescence and numerical simulations, the influence of optical detrapping on the charging and decharging of persistent phosphors is investigated.
ICDIM 2016 Optical detrapping in persistent phosphors
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Two decades after the development of the blue light-emitting diode (LED), LEDs have quickly established themselves as the lighting technology of the future. The high efficiency, spectral tunability, lack of toxic compounds and a small footprint makes them far more attractive than other lighting technologies. The high efficiency, now well exceeding 100 lum/W in commercial products, has still the margin to double, promising a strong reduction in electricity consumption. White LEDs are commonly based on a blue LED, combined with luminescent materials, or phosphors, which convert part of the blue light to longer wavelengths, the mixture providing white light. Besides the workhorse Y3Al5O12:Ce (YAG:Ce, yielding yellow emission), europium doped phosphors are used to provide e.g. the red emission required for warm-white LEDs. Six main requirements for LED phosphors are discussed and used to explain the discrepancy between the high number of compositions described in literature and the handful of actually used compounds, being almost uniquely based on rare earth ions as luminescent center [1]. Alternative materials avoiding the use of rare earth ions are discussed, including Mn4+ doped fluorides phosphors (e.g. K2SiF6:Mn4+ [2]) and quantum dots. Finally, the impact of phosphor geometries on phosphor use, including remote phosphor applications, are discussed. [1] Smet PF and Joos JJ, Nat. Mater. 16 (2017) 500. [2] Sijbom H et al, Opt. Mater. Exp. 7 (2017) 3332.
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Slides of my first invited talk at a conference, the ALD 2005 conference in San Jose 2005, about ALD modelling. ALD is fantastic, but fantastic is not perfect :) --- R. L. Puurunen, Atomic-scale modelling of atomic layer deposition processes, American Vacuum Society Topical Conference on Atomic Layer Deposition (ALD 2005), San Jose, California, August 8-10, 2005. Invited talk.
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Presentation on opportunities and limitations of energy storage phosphors, which can be used for glow-in-the-dark roads or safety illumination. Loss mechanisms in phosphors. Presented at the Phosphor Global Summit and Quantum Dot Forum 2019 in San Diego, La Jolla, California. March 19-21.
Energy storage phosphors @ Phosphor Global Summit 2019
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Presentation given at the 6th International Conference on Excited States of Transition Elements (ESTE 2016), August 23 2016. Presentation discusses detrapping mechanisms in persistent phosphors, focussing on optical and mechanical detrapping.
ESTE2016 Detrapping in persistent phosphors
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Coating Measurement Using Handheld X-Ray Fluorescence Abstract Handheld X-ray fluorescence (HHXRF) can be used to measure coating thicknesses with advantages in precision and portability compared to other technologies. For benchtop analysis, analyzing coatings applied over large surface areas often requires destructive procedures. HHXRF overcomes this limitation and provides a nondestructive coating thickness testing capability. A simple, user-friendly calibration built into the instrument interface enables the use of a certified standard to determine up to three layers of accurate and precise coating thicknesses. HHXRF coating measurements, which are independent of the substrate material, provide a user the freedom to analyze any deposited coating comprised of elements Ti through Pu. Because of the large elemental range of analysis, many corrosion-, wear-, and adhesion-resistant coatings measured in labs near the site of action can benefit from the precise results returned by HHXRF.
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Two decades after the development of the blue light-emitting diode (LED), LEDs have quickly established themselves as the lighting technology of the future. The high efficiency, spectral tunability, lack of toxic compounds and a small footprint makes them far more attractive than other lighting technologies. The high efficiency, now well exceeding 100 lum/W in commercial products, has still the margin to double, promising a strong reduction in electricity consumption. White LEDs are commonly based on a blue LED, combined with luminescent materials, or phosphors, which convert part of the blue light to longer wavelengths, the mixture providing white light. Besides the workhorse Y3Al5O12:Ce (YAG:Ce, yielding yellow emission), europium doped phosphors are used to provide e.g. the red emission required for warm-white LEDs. Six main requirements for LED phosphors are discussed and used to explain the discrepancy between the high number of compositions described in literature and the handful of actually used compounds, being almost uniquely based on rare earth ions as luminescent center [1]. Alternative materials avoiding the use of rare earth ions are discussed, including Mn4+ doped fluorides phosphors (e.g. K2SiF6:Mn4+ [2]) and quantum dots. Finally, the impact of phosphor geometries on phosphor use, including remote phosphor applications, are discussed. [1] Smet PF and Joos JJ, Nat. Mater. 16 (2017) 500. [2] Sijbom H et al, Opt. Mater. Exp. 7 (2017) 3332.
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Puurunen_invited-talk_ALD-modelling_ALD2005_050805
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Presentation on opportunities and limitations of energy storage phosphors, which can be used for glow-in-the-dark roads or safety illumination. Loss mechanisms in phosphors. Presented at the Phosphor Global Summit and Quantum Dot Forum 2019 in San Diego, La Jolla, California. March 19-21.
Energy storage phosphors @ Phosphor Global Summit 2019
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Presentation given at the 6th International Conference on Excited States of Transition Elements (ESTE 2016), August 23 2016. Presentation discusses detrapping mechanisms in persistent phosphors, focussing on optical and mechanical detrapping.
ESTE2016 Detrapping in persistent phosphors
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Philippe Smet
Overview of lighting technologies. Focus on blue LEDs, solid state lighting, colour conversion by luminescent materials. Applications of LEDs. Future of lighting.
Pfsmet amazing rise of solid state lighting
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The Effects on Rapid Laser Heating on a Au (111) Sample
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Sean Nees
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Coating Measurement Using Handheld X-Ray Fluorescence Abstract Handheld X-ray fluorescence (HHXRF) can be used to measure coating thicknesses with advantages in precision and portability compared to other technologies. For benchtop analysis, analyzing coatings applied over large surface areas often requires destructive procedures. HHXRF overcomes this limitation and provides a nondestructive coating thickness testing capability. A simple, user-friendly calibration built into the instrument interface enables the use of a certified standard to determine up to three layers of accurate and precise coating thicknesses. HHXRF coating measurements, which are independent of the substrate material, provide a user the freedom to analyze any deposited coating comprised of elements Ti through Pu. Because of the large elemental range of analysis, many corrosion-, wear-, and adhesion-resistant coatings measured in labs near the site of action can benefit from the precise results returned by HHXRF.
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Uranium Enrichment Technology
1.
Uranium EnrichmentTechnology A
DON’T DIY guide to
2.
What is Enriched
Uranium? Uranium 238 (Natural Uranium) 235 (Isotope) Fissile
3.
Types of Enriched
Uranium Grades Natural Uranium Low-Enriched Weapons-Grade
4.
Enrichment Processes Diffusion
Centrifuge Laser Separation Other
5.
Diffusion Techniques Gaseous
Diffusion
6.
Diffusion Techniques Thermal
Diffusion No longer used
7.
Centrifuge Techniques Gas
Centrifuge 10x more energy efficient than Gaseous Diffusion technique. http://www.youtube.com/watch?v=1X7Lr-gdxZY&feature=related
8.
Centrifuge Techniques Zippe
Centrifuge Improvement on gaseouscentrifuge technology,use of heat.
9.
Laser Separation Separation
of Isotopes by Laser Excitation (SILEX) Australian project that will be commercially ready by 2012.
10.
Laser Separation Atomic
vapor laser isotope separation(AVLIS) Photoionization of target isotope Molecular laser isotope separation(MLIS) Photolysis of Uranium Hexafluoride to Uranium Pentafluoride
11.
Other Techniques Aerodynamic
processes Becker jet nozzle Vortex tube
12.
Other Techniques Electromagnetic
Isotope Separation Ionized Uranium is deflected to coll-ection targets inmagnetic field.
13.
14.
Other Techniques Chemical
Methods Slightly different reactions of U-235, U-238 to Redox
15.
Other Techniques Plasma
Separation Selective energizing of U-235 with plasma that contains a mix of ions.
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