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Luminescent afterglow behavior in the M2Si5N8:Eu family (M = Ca,Sr,Ba)

Koen Van den Eeckhout, Philippe Smet UGent and Dirk Poelman UGent (2011) MATERIALS. 4(6). p.980-990
abstract
Persistent luminescent materials are able to emit light for hours after being excited. The majority of persistent phosphors emit in the blue or green region of the visible spectrum. Orange- or red-emitting phosphors, strongly desired for emergency signage and medical imaging, are scarce. We prepared the nitrido-silicates Ca2Si5N8:Eu (orange), Sr2Si5N8:Eu (reddish), Ba2Si5N8:Eu (yellowish orange), and their rare-earth codoped variants (R = Nd, Dy, Sm, Tm) through a solid state reaction, and investigated their luminescence and afterglow properties. In this paper, we describe how the persistent luminescence is affected by the type of codopant and the choice and ratio of the starting products. All the materials exhibit some form of persistent luminescence, but for Sr2Si5N8:Eu,R this is very weak. In Ba2Si5N8:Eu the afterglow remains visible for about 400 s, and Ca2Si5N8:Eu,Tm shows the brightest and longest afterglow, lasting about 2,500 s. For optimal persistent luminescence, the dopant and codopant should be added in their fluoride form, in concentrations below 1 mol%. A Ca3N2 deficiency of about 5% triples the afterglow intensity. Our results show that Ba2Si5N8:Eu(,R) and Ca2Si5N8:Eu(,R) are promising persistent phosphors for applications requiring orange or red light.
Please use this url to cite or link to this publication:
author
organization
alternative title
Luminescent afterglow behavior in the M(2)Si(5)N(8): Eu family (M = Ca, Sr, Ba)
year
type
journalArticle (original)
publication status
published
subject
keyword
persistent luminescence, nitrido-silicates, rare earths, europium, afterglow, thermoluminescence, PERSISTENT LUMINESCENCE, NITRIDO-SILICATES, PHOSPHOR, THERMOLUMINESCENCE, CA2SI5N8EU2+, TM3+, FLUORESCENCE, CONVERSION, MECHANISM, BA2SI5N8, DY3+
journal title
MATERIALS
Materials
volume
4
issue
6
issue title
Luminescent materials 2011
pages
980 - 990
Web of Science type
Article
Web of Science id
000298245100003
JCR category
MATERIALS SCIENCE, MULTIDISCIPLINARY
JCR impact factor
1.677 (2011)
JCR rank
85/229 (2011)
JCR quartile
2 (2011)
ISSN
1996-1944
DOI
10.3390/ma4060980
project
Center for nano- and biophotonics (NB-Photonics)
language
English
UGent publication?
yes
classification
A1
copyright statement
I have retained and own the full copyright for this publication
id
1247783
handle
http://hdl.handle.net/1854/LU-1247783
date created
2011-05-30 16:25:44
date last changed
2016-12-19 15:44:48
@article{1247783,
  abstract     = {Persistent luminescent materials are able to emit light for hours after being excited. The majority of persistent phosphors emit in the blue or green region of the visible spectrum. Orange- or red-emitting phosphors,  strongly desired for emergency signage and medical imaging, are scarce. We prepared the nitrido-silicates Ca2Si5N8:Eu (orange), Sr2Si5N8:Eu (reddish), Ba2Si5N8:Eu (yellowish orange), and their rare-earth codoped variants (R = Nd, Dy, Sm, Tm) through a solid state reaction, and investigated their luminescence and afterglow properties. In this paper, we describe how the persistent luminescence is affected by the type of codopant and the choice and  ratio of the starting products. 
All the materials exhibit some form of persistent luminescence, but for Sr2Si5N8:Eu,R this is very weak. In Ba2Si5N8:Eu the afterglow remains visible for about 400 s, and Ca2Si5N8:Eu,Tm shows the brightest and longest afterglow, lasting about 2,500 s. For optimal persistent luminescence, the dopant and codopant should be added in their fluoride form, in concentrations below 1 mol\%. A Ca3N2 deficiency of about 5\% triples the afterglow intensity. Our results show that Ba2Si5N8:Eu(,R) and Ca2Si5N8:Eu(,R) are promising persistent phosphors for applications requiring orange or red light.},
  author       = {Van den Eeckhout, Koen and Smet, Philippe and Poelman, Dirk},
  issn         = {1996-1944},
  journal      = {MATERIALS},
  keyword      = {persistent luminescence,nitrido-silicates,rare earths,europium,afterglow,thermoluminescence,PERSISTENT LUMINESCENCE,NITRIDO-SILICATES,PHOSPHOR,THERMOLUMINESCENCE,CA2SI5N8EU2+,TM3+,FLUORESCENCE,CONVERSION,MECHANISM,BA2SI5N8,DY3+},
  language     = {eng},
  number       = {6},
  pages        = {980--990},
  title        = {Luminescent afterglow behavior in the M2Si5N8:Eu family (M = Ca,Sr,Ba)},
  url          = {http://dx.doi.org/10.3390/ma4060980},
  volume       = {4},
  year         = {2011},
}

Chicago
Van den Eeckhout, Koen, Philippe Smet, and Dirk Poelman. 2011. “Luminescent Afterglow Behavior in the M2Si5N8:Eu Family (M = Ca,Sr,Ba).” Materials 4 (6): 980–990.
APA
Van den Eeckhout, K., Smet, P., & Poelman, D. (2011). Luminescent afterglow behavior in the M2Si5N8:Eu family (M = Ca,Sr,Ba). MATERIALS, 4(6), 980–990.
Vancouver
1.
Van den Eeckhout K, Smet P, Poelman D. Luminescent afterglow behavior in the M2Si5N8:Eu family (M = Ca,Sr,Ba). MATERIALS. 2011;4(6):980–90.
MLA
Van den Eeckhout, Koen, Philippe Smet, and Dirk Poelman. “Luminescent Afterglow Behavior in the M2Si5N8:Eu Family (M = Ca,Sr,Ba).” MATERIALS 4.6 (2011): 980–990. Print.