Please use this identifier to cite or link to this item:
|Title:||Investigation of europium concentration dependence on the luminescent properties of borogermanate glasses||Authors:||Gökçe, Melis
Uslu, Deniz K.
Gökçe, Aytaç Gürhan
|Issue Date:||Dec-2017||Publisher:||Elsevier Ltd.||Source:||Gökçe, M., Şentürk, U., Uslu, D. K., Burgaz, G., Şahin, Y., and Gökçe, A. G. (2017). Investigation of europium concentration dependence on the luminescent properties of borogermanate glasses. Journal of Luminescence, 192, 263-268. doi:10.1016/j.jlumin.2017.06.041||Abstract:||In order to elucidate the effect of europium content on the optical and luminescent properties of borogermanate glasses, a series of Eu3+ doped 30B2O3-40GeO2-(30-x)Gd2O3 glasses with various doping levels (x=1–9 mol%) have been synthesized and studied with transmission, absorption, photoluminescence and decay time measurements. The transmission spectra proved that the title glasses maintained a high transparency about 80% in the 440 to 900 nm region. Based on the absorption spectra, the optical band gaps obtained from Tauc's plot can be narrowed by increasing content of Eu3+. From the photoluminescence spectra, the strongest red emission has been observed from the 5D0→7F2 level of Eu3+ ions in borogermanate glasses. The strongest emission and excitation intensities of Eu3+ ions are at the doping level of x=7 mol% and then these intensities decrease due to concentration quenching. The red to orange ratio (R/O) of 5D0→7F2 to 5D0→7F1 transitions has been investigated to predict the local environment of Eu3+ ions. Judd-Ofelt (J-O) analyses have been performed from the emission spectra. The values of R/O and Ω2 present an increase with increasing doping level, indicating the lower symmetric environment for Eu3+ ions and higher covalency for Eu-O bond. The emission efficiency calculated from J-O theory is 75% at x=2 mol%. The decay time curves of 6P7/2→8S7/2 transition of Gd3+ ions and 5D0–7F2 transition of Eu3+ ions confirm the energy transfer from Gd3+ to Eu3+ ions.||URI:||http://doi.org/10.1016/j.jlumin.2017.06.041
|Appears in Collections:||Materials Science and Engineering / Malzeme Bilimi ve Mühendisliği|
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Sürdürülebilir Yeşil Kampüs Koleksiyonu / Sustainable Green Campus Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection
Show full item record
checked on Dec 11, 2021
WEB OF SCIENCETM
checked on Jan 22, 2022
checked on Jan 24, 2022
checked on Jan 24, 2022
Items in GCRIS Repository are protected by copyright, with all rights reserved, unless otherwise indicated.