ChemInform Abstract: A New Long Phosphorescent Phosphor with High Brightness, SrAl2O4:Eu2+, Dy3+.

Abstract

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Persistent luminescence in MSi_2O_2N_2:Eu phosphors

“…It shows two distinct bands, a first one peaking around 315 nm and a second band starting at around 360 nm and extending into the visible part of the spectrum. Excitation across the optical band gap is not prominent in the presented excitation spectra as this is situated at shorter wavelengths, namely at 260 nm for BaSi 2 Eu. This is in line with literature data [6] and can also be related to the difference in crystal structure and in number of possible Eu sites in the material.…”

“…All emission spectra were recorded at an excitation wavelength of 380 nm and show a relatively broad emission band. For BaSi 2 [6]. The broad emission spectrum then originates from considerably overlapping emission bands, which are related to the different sites.…”

“…An overview of reported europium based persistent luminescent materials (and suggested mechanisms) is given by Van den Eeckhout et al [1]. SrAl 2 O 4 :Eu,Dy is an efficient persistent luminescent material with an afterglow duration exceeding 30 h. The report on this green emitting phosphor in 1996 by Matsuzawa et al [2] marked the start for intensive scientific research on persistent luminescence.…”

Extending the afterglow in CaAl_2O_4:Eu,Nd persistent phosphors by electron beam annealing

“…These materials find applications in emergency signage, toys, catalysis and medical imaging [1][2][3][4]. After the discovery of SrAl 2 O 4 :Eu,Dy as efficient green persistent phosphor [5], the research has mainly focused on rare-earth doped phosphors [6,7]. Most often, Eu 2+ is introduced as the recombination center, while the afterglow is extended by addition of other trivalent rare earth ions.…”

Feature issue introduction: persistent and photostimulable phosphors – an established research field with clear challenges ahead

“…The current era of research in persistent phosphors started twenty years ago with the publication on the green emitting SrAl 2 O 4 :Eu,Dy by Matsuzawa et al [15]. Although strontium aluminate phosphors constitute the largest fraction of the commercial production, several aspects about the trapping and detrapping processes have not yet been elucidated for this particular set of materials.…”