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

Max-Fabian Volhard, Thomas Jüstel

2017

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).

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

@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 - Volume 1: PHOTOPTICS,},
year={2017},
pages={122-125},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0006269101220125},
isbn={978-989-758-223-3},
}

in EndNote Style

TY - CONF
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