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Showing 1 to 20 of 108 for “"phosphor"”.
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Electroluminescence and inorganic phosphor science
… to be the most efficient cathode ray excited phosphors, while the Cu doped phosphors came next in efficiency, performing equally well under an electron or a UV laser beam (from a HeCd laser at 325 rim). Smaller luminescence peaks were also detected in Ag doped films. Transferred films showed …
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Phosphor-modifizierte Katalysatoren zur PSA-Herstellung
… der Arbeit war die Untersuchung der Effekte von Phosphor als Additiv auf das reine Trägeroxid und auf das Katalysatorsystem V2O5/TiO2. Zu Beginn wurde ein kontaminationsarmes Trägeroxid in der Anatasmodifikation hergestellt. Für die TiO2-getragenen Vanadiumoxide wurden unabhängig von der Art der …
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Phosphor(V)-nitride durch Hochdruck-Hochtemperatur-Synthese
… nitridophosphates can be obtained by reaction of phosphorus(V) nitride with alkaline or earth alkaline azides at temperatures of 1200-1600 °C. Thus the possibilty to suppress eliminiation of N2 from nitridophosphates, which occurs at 800 °C under atmospheric pressure, was proved by use of …
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Optical Properties of Rare-Earth Doped YBO3 Phosphor Materials
YBO3:Eu3+, a red phosphor, is of current interest due to its application in plasma display panels (PDPs) and white light emitting diodes (WLEDs). YBO3:Eu3+ offers exceptional properties such as high optical damage threshold, high quantum efficiency in deep ultraviolet region (UV) but this material …
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Entwicklung eines Verfahrenskonzepts zur Entfernung von Phosphor in der dezentralen Abwasserbehandlung
Der Eintrag von Phosphor in die Umwelt führt zur Eutrophierung von Gewässern, sodass ein Großteil dieser innerhalb der Europäischen Union (EU) in keinem guten chemischen Zustand ist. Phosphor gelangt überwiegend auf zwei Wegen in die Umwelt, diffus durch Auswaschung von auf landwirtschaftlichen …
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Das Nährstoffelement Phosphor in limnischen Sedimenten verschiedener Herkunft: Konzentration und Bindungsformen
… Folge hoher Nährstoffeinträge, insbesondere von Phosphor stellt ein schwerwiegendes Problem für viele Binnen- und Küstengewässer dar. Mit dem Ziel, Belastungsschwerpunkte in Gewässern ausfindig zu machen, über die wenige Daten vorliegen, wurden die Phosphorkonzentrationen in limnischen Sedimenten …
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Precipitation techniques and characterisation of rare earth element doped phosphor materials
… to control the size and morphology of precursor phosphor materials for potential applications in a new generation of high definition and field emission displays. The morphological and luminescent characteristics of these precursor phosphor materials were studied after they were annealed to form …
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A study of thermographic phosphor thermometry in an operating turbofan engine
… dependent optical properties of thermographic phosphors was evaluated for use in measuring high-pressure turbine blade metal temperatures in an operating turbofan engine test rig. Thermographic phosphors, ceramics doped with a rare earth metal, were bonded to the turbine blades. These phosphors …
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Optimization of the MgS:Eu:Sm phosphor for potential use as an optically stimulated personnel dosimeter
… with europium and samarium is a candidate phosphor for laser stimulated personnel dosimeters. Optically stimulated luminescence (OSL) dosimeters are advantageous in that they provide a faster, isothermal dose measurement than conventional thermoluminescent dosimeters. The effects of …
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Calcitfällung und Phosphor-Kopräzipitation im Phosphorhaushalt eines eutrophen Hartwassersees mit anoxischem Hypolimnion (Willersinnweiher, Ludwigshafen am Rhein)
… Calcitfällung mit der Kopräzipitation von Phosphor hinsichtlich der Bedeutung für den trophischen Zustand und die trophische Entwicklung des eutrophen Willersinnweihers. Die Beprobungen des Sees in hoher zeitlicher Auflösung mit der Analyse zahlreicher physikalischer und chemischer …
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Erarbeitung einer P-Bilanz im Rahmen eines Konzeptes zur Sanierung und Restaurierung des Rangsdorfer Sees
… guten Zustand nicht erreichen. Bekanntlich gilt Phosphor für viele Gewässer als der bedeutendste produktionslimitierende Nährstoff und ist somit aussichtsreicher Steuerfaktor für eine erfolgreiche Seentherapie. Ziel dieser Arbeit war es, die Gewässergüte des Rangsdorfer Sees nach trophischen …
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Structure Design and Luminescence Control of Eu⁺²-doped Orthorhombic Phosphors for Solid-State Lighting Applications
… devices urge the innovation of bright and robust phosphors. Most of the current phosphors either have low quantum efficiencies (internal and external, IQE/EQE) or have poor luminescence thermal stability, significantly affecting the performance of phosphor-converted white light emitting diodes …
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Alternating current electroluminescent properties of zinc sulfide powders
… were conducted: synthesis of zinc sulfide phosphors (comprised of zinc, sulfur and copper dopant); thermal shocking of phosphor materials (sudden cooling, using liquid nitrogen, of phosphor particles heated up to 500oC) and analysis of their alternating current electroluminescent properties …
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White Light Endoscopy for Minimal Invasive Surgery
… of producing a solid-state LED or laser pumped phosphor white light system. The overall aim was to replace current xenon lamps, which have many unwanted characteristics with lower cost, higher efficiency and more environmentally friendly solid state devices to improve the benefits of endoscopic …
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Studies of luminescent materials including novel preparation of phosphors
… conditions and other factors affecting the phosphor synthesis process. Microgels have also been used for the first time in the zinc sulphide preparation process. The resultant small, regular spherical sized particles have similar luminescent properties to those of the commercial standards …
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Growth optimisation and laser processing of thin film phosphors for electroluminescent displays
… presents results of a study of ZnS:Mn thin film phosphors used in Thin Film ELectroluminescent (TFEL) and Laterally Emitting TFEL (LETFEL) devices, examining techniques for phosphor growth optimisation and post deposition processing in order to strengthen development of novel TFEL devices. To …
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HIGH TEMPERATURE ZnSe:Mn/ZnS NANOPHOSPHORS WITH VERY HIGH QUANTUM EFFICIENCY FOR WHITE LEDs
… LED design consists of a blue LED and a yellow phosphor, which in conjunction produce white light. The LED phosphor is a yellow phosphor made of yttrium aluminum garnet doped with cerium (YAG:Ce). While it does strongly absorb blue light, its external quantum efficiency is only 75% under blue …
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