On the luminescence characteristics of cerium and copper doped barium sulphide phosphor

Thomas, R.; Nampoori, V. P. N.

doi:10.1016/0038-1098(88)91025-3

Cited by 7 publications

(2 citation statements)

References 5 publications

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“…The results obtained by the different techniques described above are not always comparable. This is illustrated by applying several methods on the same glow curve, as was done by for example [ 107 ] in the case of cerium and copper doped barium sulfide. In this paper, the Urbach, Randall-Wilkins and Chen methods (among others) were compared.…”

Section: Estimating Trap Depthsmentioning

confidence: 99%

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Persistent Luminescence in Eu2+-Doped Compounds: A Review

2010

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In 1996, Matsuzawa et al. reported on the extremely long-lasting afterglow of SrAl2O4:Eu2+ codoped with Dy3+ ions, which was more than 10-times brighter than the previously widely used ZnS:Cu,Co. Since then, research for stable and efficient persistent phosphors has continuously gained popularity. However, even today - almost 15 years after the discovery of SrAl2O4:Eu2+, Dy3+ - the number of persistent luminescent materials is still relatively low. Furthermore, the mechanism behind this phenomenon is still unclear. Although most authors agree on the general features, such as the existence of long-lived trap levels, many details are still shrouded in mystery. In this review, we present an overview of the important classes of known persistent luminescent materials based on Eu2+-emission and how they were prepared, and we take a closer look at the models and mechanisms that have been suggested to explain bright afterglow in various compounds.

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Section: Estimating Trap Depthsmentioning

confidence: 99%

“…In that case, multiple exponentials can be fitted to the decay, and for each of these an appropriate trap depth can be estimated. Although this method is sometimes used in binary sulfides [ 107 , 109 ], it is, to the best of our knowledge, never applied in Eu 2+ -doped materials.…”

Section: Estimating Trap Depthsmentioning

confidence: 99%

Persistent Luminescence in Eu2+-Doped Compounds: A Review

2010

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Aktuelle Entwicklungen auf dem Gebiet der anorganischen Leuchtstoffe

Höppe

2009

Angewandte Chemie

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Energiesparen ist angesagt! Eine Steigerung der Energieffizienz ermöglichen neue anorganische lumineszierende Materialien, wie sie in Displays und weißen Leuchtdioden (Bild: Farbdiagramm; Mischung der drei Emissionen A–C liefert beliebige Farbtöne innerhalb des Dreiecks) zum Einsatz kommen. In Hg‐freien Leuchtstoffröhren könnten sie einen Beitrag zum Umweltschutz leisten; außerdem liefern sie bessere Szintillatoren für die medizinische Diagnose.magnified imageAngesichts knapp werdender Rohstoffe und des zu erwartenden Klimawandels lässt sich unser Lebensstandard nur durch eine signifikante Steigerung der Energieeffizienz erhalten. Sehr viel Energie wird zur Beleuchtung oder beim Betrieb von Bildschirmen aufgewendet. Herausforderungen sind somit die Entwicklung sparsamer Leuchtmittel, wie weiße Leuchtdioden, und möglichst effizienter Bildschirmkonzepte. Die Nutzung der Sonnenenergie gelingt über Solarzellen, deren Effizienz sich deutlich verbessern muss. Einen Beitrag hierzu könnten spezielle Leuchtstoffe leisten, die zusätzlich die Stromerzeugung aus Wärmestrahlung ermöglichen. Eine weitere wichtige Anwendungsmöglichkeit findet sich bei bildgebenden medizinischen Untersuchungsverfahren, die effiziente und empfindliche Detektoren erfordern, um Patienten zu schonen. Bei der Lösung dieser zentralen Fragen stehen vielversprechende Seltenerdionen‐dotierte anorganische Festkörperverbindungen im Zentrum der Forschungsaktivitäten.

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Recent Developments in the Field of Inorganic Phosphors

2009

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Because fossil fuels are becoming scarce and because of the expected climate change, our standard of living can only be maintained by a significant increase in energy efficiency. Large amounts of energy are consumed for lighting and during operation of displays. Thus, the targets are the development of economical light sources like white-light-emitting diodes and display panels with enhanced efficiency. Solar energy is converted into electricity by solar cells, and their efficiency must be improved considerably. A possible contribution might be delivered by phosphors which allow the conversion of thermal radiation into electrical energy. Although the target of energy efficiency is very important, we must not overlook that medical imaging diagnostic methods require efficient and sensitive detectors. For the solution of these central questions, inorganic solid-state materials doped with rare-earth ions are very promising and are therefore in the focus of current research activities.

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On the luminescence characteristics of cerium and copper doped barium sulphide phosphor

Cited by 7 publications

References 5 publications

Persistent Luminescence in Eu2+-Doped Compounds: A Review

Persistent Luminescence in Eu2+-Doped Compounds: A Review

Aktuelle Entwicklungen auf dem Gebiet der anorganischen Leuchtstoffe

Recent Developments in the Field of Inorganic Phosphors

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