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Authors: Max-Fabian Volhard and Thomas Jüstel

Affiliation: Münster University of Applied Sciences, Germany

Keyword(s): Solid State Actinometer, (Ba1-X/2Sr1-X/2)2sio4:Eux, Ortho-Silicates, X-ray Excitation, X-ray Luminescence.

Abstract: Eu2+ doped ortho-silicates are widely applied as luminescent materials in phosphor converted light emitting diodes (pcLEDs) (Park et al. 2003; Jüstel et al. 2012), due to their high quantum yield, strong absorption, short decay time, and long-term stability upon blue light excitation. The optical properties of (Ba1-x/2Sr1-x/2)2SiO4:Eux upon x-ray radiation are, however, much less known and were thus analysed in this work. It turned out that the activator ions in Eu3+ activated ortho-silicates are reduced to Eu2+ upon excitation by high energy radiation (> 5.0 eV). This reduction process can be monitored by the fading of the red line emission of Eu3+ in the range between 590 and 710 nm, originating from the [Xe]4f6-[Xe]4f6 transitions of Eu3+. At the same time, a novel green broad emission band caused by the interconfigurational transition [Xe]4f7-[Xe]4f65d1 shows up (fig. 1). This spectral change is a function of the irradiation period and can be quantified by the colour point shift of the emitted spectrum as well (fig. 2). (More)

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Paper citation in several formats:
Volhard, M. and Jüstel, T. (2017). On the Luminescence of (Ba0.5Sr0.5)2SiO4:Eu3+ upon X-ray Exposure. In Proceedings of the 5th International Conference on Photonics, Optics and Laser Technology - PHOTOPTICS; ISBN 978-989-758-223-3; ISSN 2184-4364, SciTePress, pages 122-125. DOI: 10.5220/0006269101220125

@conference{photoptics17,
author={Max{-}Fabian Volhard. and Thomas Jüstel.},
title={On the Luminescence of (Ba0.5Sr0.5)2SiO4:Eu3+ upon X-ray Exposure},
booktitle={Proceedings of the 5th International Conference on Photonics, Optics and Laser Technology - PHOTOPTICS},
year={2017},
pages={122-125},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0006269101220125},
isbn={978-989-758-223-3},
issn={2184-4364},
}

TY - CONF

JO - Proceedings of the 5th International Conference on Photonics, Optics and Laser Technology - PHOTOPTICS
TI - On the Luminescence of (Ba0.5Sr0.5)2SiO4:Eu3+ upon X-ray Exposure
SN - 978-989-758-223-3
IS - 2184-4364
AU - Volhard, M.
AU - Jüstel, T.
PY - 2017
SP - 122
EP - 125
DO - 10.5220/0006269101220125
PB - SciTePress

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