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Persistent luminescence in rare-earth doped nitrido-silicates

Koen Van den Eeckhout (UGent) , Philippe Smet (UGent) and Dirk Poelman (UGent)
Author
Organization
Project
Center for nano- and biophotonics (NB-Photonics)
Abstract
Some luminescent materials are able to continue emitting light for hours after they have been excited, a phenomenon known as persistent luminescence. The majority of persistent phosphors known today are based on aluminates or silicates and emit in the blue or green region of the visible spectrum. Orange or red phosphors, strongly desired for emergency signage and medical imaging, are scarce. We prepared the yellowish-orange nitrido-silicates M2Si5N8:Eu,R (M = Ca, Sr, Ba), and their rare-earth codoped variants (R = Nd, Dy, Sm, Tm) through a solid state reaction, and investigated their luminescence and afterglow properties. Persistent luminescence is present in all the prepared samples, but the brightness and duration of the afterglow strongly depend on the host material, the codopant and the choice and ratio of the starting products. This demonstrates the importance of charge carrier traps that are suitably located (both physically and energetically), since these govern the maximum light storage and release capabilities of a persistent phosphor. The number and depth of these traps are estimated from the thermoluminescent glow curve, the integrated light output and the decay profile. Of all the prepared materials, Ca2Si5N8:Eu,Tm is the most promising persistent phosphor with a bright orange afterglow that remains visible for about an hour.

Citation

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Chicago
Van den Eeckhout, Koen, Philippe Smet, and Dirk Poelman. 2011. “Persistent Luminescence in Rare-earth Doped Nitrido-silicates.” In Belgian Physical Society, Annual General Scientific Meeting, Abstracts. Belgian Physical Society (BPS).
APA
Van den Eeckhout, K., Smet, P., & Poelman, D. (2011). Persistent luminescence in rare-earth doped nitrido-silicates. Belgian Physical Society, Annual general scientific meeting, Abstracts. Presented at the 2011 Annual general scientific meeting of the Belgian Physical Society (BPS 2011), Belgian Physical Society (BPS).
Vancouver
1.
Van den Eeckhout K, Smet P, Poelman D. Persistent luminescence in rare-earth doped nitrido-silicates. Belgian Physical Society, Annual general scientific meeting, Abstracts. Belgian Physical Society (BPS); 2011.
MLA
Van den Eeckhout, Koen, Philippe Smet, and Dirk Poelman. “Persistent Luminescence in Rare-earth Doped Nitrido-silicates.” Belgian Physical Society, Annual General Scientific Meeting, Abstracts. Belgian Physical Society (BPS), 2011. Print.
@inproceedings{1234918,
  abstract     = {Some luminescent materials are able to continue emitting light for hours after they have been excited, a phenomenon known as persistent luminescence. The majority of persistent phosphors known today are based on aluminates or silicates and emit in the blue or green region of the visible spectrum. Orange or red phosphors, strongly desired for emergency signage and medical imaging, are scarce. We prepared the yellowish-orange nitrido-silicates M2Si5N8:Eu,R (M = Ca, Sr, Ba), and their rare-earth codoped variants (R = Nd, Dy, Sm, Tm) through a solid state reaction, and investigated their luminescence and afterglow properties. Persistent luminescence is present in all the prepared samples, but the brightness and duration of the afterglow strongly depend on the host material, the codopant and the choice and ratio of the starting products. This demonstrates the importance of charge carrier traps that are suitably located (both physically and energetically), since these govern the maximum light storage and release capabilities of a persistent phosphor. The number and depth of these traps are estimated from the thermoluminescent glow curve, the integrated light output and the decay profile. Of all the prepared materials, Ca2Si5N8:Eu,Tm is the most promising persistent phosphor with a bright orange afterglow that remains visible for about an hour.},
  author       = {Van den Eeckhout, Koen and Smet, Philippe and Poelman, Dirk},
  booktitle    = {Belgian Physical Society, Annual general scientific meeting, Abstracts},
  isbn         = {9782870377178},
  language     = {eng},
  location     = {Namur, Belgium},
  publisher    = {Belgian Physical Society (BPS)},
  title        = {Persistent luminescence in rare-earth doped nitrido-silicates},
  year         = {2011},
}