Optical Investigation of Eu3+ Doped Bi12GeO20 (BGO) Crystals

Abstract

The spectroscopic properties of Eu3+ doped Bi12GeO20 (BGO) sillenite bulk crystals that were grown by the low-thermal-gradient Czochralski technique (LTG Cz) were investigated. The absorption spectra and the emission properties have been measured at room temperature (300 K) and at 10 K. Luminescence was observed both due to the direct Eu3+ ion excitation, as well as under UV excitation due to the energy transfer between Bi3+ and Eu3+ ions. Bi3+ → Eu3+ energy transfer mechanisms in Eu3+:BGO doped host were investigated. The Ωλ parameters, as well as radiative lifetimes, were calculated based upon the Judd-Ofelt formalism. The branching ratios and electric dipole transition probabilities were also determined, based upon the obtained experimental results. Luminescence has been observed from the 5D0,1,2 levels of Eu3+, with emissions from the 5D0 level being the strongest. The strongest observed luminescence band corresponds to the 5D0 → 7F0 transition at 578.7 nm. Reasons for the strong presence of the theoretically forbidden 5D0 → 7F0 emission were investigated.

A Review on X-ray Excited Emission Decay Dynamics in Inorganic Scintillator Materials

“…the luminosities found in SrBiO 2 Cl and BGO. There are more research reports on the doped BGO[96,[129][130][131][132].…”

Red-emission analysis, Judd–Ofelt intensity parameters and laser properties of CdMgZnO:xEu3+ nanocrystals: the effects of Eu3+ concentration

“…The Ω 4 parameter reflects the rigidity and viscosity of the local environment surrounding the RE ions [59]. The intensity parameters (Ω 2 and Ω 4 ) are obtained from Einstein's relation for spontaneous emission probability given by [60,61]:…”

Investigation of defect levels in Bi12SiO20 single crystals by thermally stimulated current measurements

“…Bi 12 MO 20 (M: Si, Ge, Ti) ternary compounds are known as sillenites and have been investigated for long times due to their photorefractive, photoconductive, piezoelectric characteristics [1][2][3][4][5][6]. The fascinating properties of the sillenite group members make them preferable materials in various electronic applications like hologram recording, photocatalysts, optical data processing and interferometry [7][8][9][10][11].…”