Determination of the charge state of chromium in Cr:Bi12GeO20 single crystals by spectral luminescence methods

Степанова, И. В.; Gorashchenko, N. G.; Субботин, К. А.; Смирнов, В. А.

doi:10.1134/s0030400x09090021

Cited by 6 publications

(3 citation statements)

References 9 publications

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“…615 cm −1 ; this band can be attributed to vibration of the O(2)-Bi complex (the Bi 12 GeO 20 type structure is formed by sharing-edges [BiO 5 E]-polyhedra (the [BiO 5 E] consists of five oxygen atoms-O(1a), O(1b), O(2), O(1c), and O(3) )[29,30]. As to Mo: Bi 12 GeO 20 sample, the band at 712 cm -1 may be due to the vibration of O(3)-Ge bond, which is probably related with Mo atoms occupying Ge sites; however, it needs further study.…”

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confidence: 99%

Study on photoluminescence of thermally treated Bi12GeO20 and Mo:Bi12GeO20 crystals

Tang

et al. 2011

Sci. China Technol. Sci.

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Photoluminescence (PL) of Bi 12 GeO 20 and Mo doped Bi 12 GeO 20 (Mo: Bi 12 GeO 20 ) crystals in visible and near-infrared (NIR) spectral regions were studied. X-ray diffraction analysis, absorption and Raman scattering spectra of these crystals were also measured. Pure Bi 12 GeO 20 after annealing in N 2 atmosphere at 450 ºC and 550 °C show predominant emissions at about 745 and 1250 nm bands, while the emission peaks of Mo:Bi 12 GeO 20 crystals untreated or after annealing in Ar at 300 °C are at around 538 and 1165 nm. The results suggest that annealing induces intrinsic luminescence of Bi in pure Bi 12 GeO 20 at room temperature and Mo influences the luminescence centers of Bi 12 GeO 20.

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confidence: 99%

Study on photoluminescence of thermally treated Bi12GeO20 and Mo:Bi12GeO20 crystals

Tang

et al. 2011

Sci. China Technol. Sci.

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“…Both BGO and BSO crystals in their undoped form are well-researched materials, (the first experiments were performed over 55 years ago on BGO in 1967 by Abrams S.C. et al [ 3 ]) with many practical applications [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ], such as Pockels cells and sensors [ 1 , 3 ], phase-conjugated spatial-time light modulators [ 6 ], or holographic memory storage [ 13 , 14 , 15 , 16 ]. Over the last few years, doping of sillenites with transition-metal ions (e.g., Fe, Co, Cr or Cu) has been researched quite intensively with the goal of increasing the usefulness of BSO and BGO for holographic storage applications [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. In 2020, BGO crystals doped with Eu 3+ were successfully grown, which exhibited a strong luminescence in the yellow–red range of spectrum and could potentially be used as a laser material [ 25 ].…”

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confidence: 99%

A Comparative Study of Eu3+-Doped Sillenites: Bi12SiO20 (BSO) and Bi12GeO20 (BGO)

et al. 2023

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The spectroscopic properties of Eu3+-doped Bi12SiO20 (BSO) were investigated and compared with that of Eu3+-doped Bi12GeO20 (BGO). The emission properties and the absorption spectra have been measured at 10 K as well as at 300 K (room temperature). Luminescence was detected due to the direct excitation of the 5D0 level of Eu3+, as well as through the excitation of the 5D1 level. The Judd–Ofelt theoretical framework was used to compute the radiative lifetimes (τ) and the omega parameters (Ωλ). The electric dipole transition probabilities, asymmetry ratios (R), along with the branching ratios (β) were also determined based on the obtained experimental data. The strongest detected luminescence belongs to the 5D0 → 7F0 transition observed at 578 nm, similar to the BGO sillenite. Reasons for the major presence of the 5D0 → 7F0 emission, theoretically forbidden by the Judd–Ofelt Theory, were investigated and compared with that of the BGO sillenite. Obtained results showed that the strong 5D0 → 7F0 line is also present in Eu:BSO, indicating that this is a feature of the entire sillenite family and not just Eu:BGO.

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“…In recent years, metal-ion doping of BGO and other sillenites (mostly with 3d transition metal ions, such as Cr, Fe, Cu, Co, etc.) has been extensively studied as a means of further improving their efficiency as a holographic memory medium [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Optical Investigation of Eu3+ Doped Bi12GeO20 (BGO) Crystals

Kowalczyk

Ramazanova

et al. 2020

Crystals

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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.

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Determination of the charge state of chromium in Cr:Bi12GeO20 single crystals by spectral luminescence methods

Cited by 6 publications

References 9 publications

Study on photoluminescence of thermally treated Bi12GeO20 and Mo:Bi12GeO20 crystals

Study on photoluminescence of thermally treated Bi12GeO20 and Mo:Bi12GeO20 crystals

A Comparative Study of Eu3+-Doped Sillenites: Bi12SiO20 (BSO) and Bi12GeO20 (BGO)

Optical Investigation of Eu3+ Doped Bi12GeO20 (BGO) Crystals

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