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- W2155363139 abstract "The content of Ce3+ ions in the investigated single crystals grown under reducing conditions is limited by a low value of the distribution coefficient. This distribution coefficient decreases sharply with increasing concentration of Ce3+ ions in a melt. Cathodoluminescent efficiency rises with increasing Ce3+ concentration up to a certain state of saturation. At higher concentrations of Ce3+ ions emission from activator centres is dominant, while at lower concentrations defect centres play an important part. Iron acts as a strong quenching centre, especially in the YAlO3 lattice. Nd, Ir, Fe, Ti, Cr centres exhibit a high quenching effect, too. A trace amount of Mo enhances cathodoluminescent efficiency. Der Gehalt an Ce3+-Ionen in den untersuchten Einkristallen wird unter Reduktionsbedingungen des Kristallwachstums durch den niedrigen Wert des Verteilungskoeffizienten begrenzt. Der Verteilungskoeffizient vermindert sich stark mit zunehmender Konzentration der Ce3+ Ionen in der Schmelze. Die Kathodolumineszenzausbeute wächst mit steigender Konzentration der Ce3+ Ionen bis zu einem bestimmten Sättigungszustand. Bei höheren Konzentrationen von Ce3+ Ionen zeigt sich die Emission aus Aktivatorzentren dominant, während bei niedrigen Konzentrationen Defektzentren wirksam werden. Eisen stellt ein starkes Löschzentrum dar, hauptsächlich im YAlO3-Gitter. Hohe Löschwirkung zeigen auch die Nd, Ir, Fe, Ti, Cr Zentren. Eine Spurmenge von Mo trägt zur Erhöhung der Kathodolumineszenzausbeute bei." @default.
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- W2155363139 date "1983-01-01" @default.
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- W2155363139 title "Cathodoluminescent efficiency of Y3Al5O12 and YAlO3 single crystals in dependence on Ce3+ and other dopants concentration" @default.
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- W2155363139 doi "https://doi.org/10.1002/crat.2170180711" @default.
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