@conference{
author = "Racu, A. V. and Ristić, Zoran and Ćirić, Aleksandar and Đorđević, Vesna and Buse, G. and Stef, M. and Dramićanin, Miroslav and Piasecki, M. and Brik, Mikhail G.",
year = "2022",
abstract = "Athorough analysis of the site symmetry of dopant ions in host materials using optical spectra of these materials provides for better understanding of their optical properties and opens further perspectives for non-destructive identification of doped materials. In this work, the CaF2 and BaF2 crystals doped with 0.1 mol% ErF3 were investigated using high resolution photoluminescence (HRPL) spectroscopy at low temperatures. The structural data for both crystals were obtained from the refined XRD diffraction patterns. At low temperatures (10 K), Stark splitting of the Er3+ energy levels was identified using HRPL. These measurements allows for differentiation between C3v and C4v site symmetries using erbium green emission peaks specific to the 4S3/2→4I15/2 transition. For CaF2:Er3+ crystal, we completed and confirmed the literature reported experimental data and the crystal field calculated data of Stark splitted energy levels [1]. For the less studied BaF2:Er3+crystal, we provided the experimental PL data on the Stark energy levels. At the room temperature, the green emission curves specific to erbium 4S3/2→4I15/2 transitions were about nine times more intense in CaF2:Er3+ compared to BaF2:Er3+ when pumped into the 4G11/2 manifold. This could correlate with the structural data but also with a observed presence of mostly the C4v and less C3v isolated centers formation in CaF2:Er3+ and mostly C3v isolated centers formation in BaF2:Er3+. Such site symmetries of isolated centers were also confirmed earlier by the dielectric measurements on similar crystals [2, 3]. Analyzing the site symmetry based on the PL data offers possibility to delimitate better isolated centers which are responsible for higher emission intensity and gives opportunity for more detailed understanding mechanism responsible for emission. This open a new opportunities to design more efficient materials with desired luminescence properties.",
publisher = "Belgrade : Society for science development of Serbia",
journal = "ICOM&IWPPP 2022 : The 6th International Conference on the Physics of Optical Materials and Devices & The 5th International Workshop of Persistent and Photostimulable Phosphors : Book of abstracts",
title = "Evaluation of site symmetries of Er3+ doped CaF2 and BaF2 crystals by high resolution photoluminescence spectroscopy",
pages = "P-22",
url = "https://hdl.handle.net/21.15107/rcub_vinar_13231"
}
