On the Luminescence of (Ba0.5Sr0.5)2SiO4:Eu3+ upon X-ray Exposure

Max-Fabian Volhard, Thomas Jüstel


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).


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Paper Citation

in Harvard Style

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 - Volume 1: PHOTOPTICS, ISBN 978-989-758-223-3, pages 122-125. DOI: 10.5220/0006269101220125

in Bibtex Style

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 - Volume 1: PHOTOPTICS,},

in EndNote Style

JO - Proceedings of the 5th International Conference on Photonics, Optics and Laser Technology - Volume 1: PHOTOPTICS,
TI - On the Luminescence of (Ba0.5Sr0.5)2SiO4:Eu3+ upon X-ray Exposure
SN - 978-989-758-223-3
AU - Volhard M.
AU - Jüstel T.
PY - 2017
SP - 122
EP - 125
DO - 10.5220/0006269101220125