Influence of MO/MF2 modifiers (M = Ca, Sr, Ba) on spectroscopic properties of Eu3+ ions in germanate and borate glasses

Żur, Lidia; Janek, Juergen; Pietrasik, Ewa; Sołtys, Marta; Pisarska, Joanna; Pisarski, Wojciech A.

doi:10.1016/j.optmat.2016.05.045

Cited by 19 publications

(8 citation statements)

References 47 publications

(29 reference statements)

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“…In the 1990s, one of the popular glass systems-GeO 2 -Ga 2 O 3 -BaO (GGB)-was developed as a candidate for optical fibers doped with rare earth ions [21]. Until now, these glasses have been modified by various oxides [22] and fluorides [23], however novel luminescent properties can be proposed. In our earlier works, we showed that the substitution of BaO by Sb 2 O 3 and TeO 2 in GGB glasses doped with Eu 3+ ions led to the polymerization of the structure and ordering processes, along with increasing amounts of modifiers [24,25].…”

Section: Introductionmentioning

confidence: 99%

Luminescent Studies on Germanate Glasses Doped with Europium Ions for Photonic Applications

et al. 2020

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Glass and ceramic materials doped with rare earth (RE) ions have gained wide interest in photonics as active materials for lasers, optical amplifiers, and luminescent sensors. The emission properties of RE-doped glasses depend on their chemical composition, but they can also be tailored by modifying the surrounding active ions. Typically, this is achieved through heat treatment (including continuous-wave and pulsed lasers) after establishing the ordering mechanisms in the particular glass–RE system. Within the known systems, silicate glasses predominate, while much less work relates to materials with lower energy phonons, which allow more efficient radiation sources to be constructed for photonic applications. In the present work, the luminescent and structural properties of germanate glasses modified with phosphate oxide doped with Eu3+ ions were investigated. Europium dopant was used as a “spectroscopic probe” in order to analyze the luminescence spectra, which characterizes the changes in the local site symmetries of Eu3+ ions. Based on the spectroscopic results, a strong influence of P2O5 content was observed on the excitation and luminescence spectra. The luminescence study of the most intense 5D0→7F2 (electric dipole) transition revealed that the increase in the P2O5 content leads to the linewidth reduction (from 15 nm to 10 nm) and the blue shift (~2 nm) of the emission peak. According to the crystal field theory, the introduction of P2O5 into the glass structure changes the splitting number of sublevels of the 5D0→7F1 (magnetic dipole) transition, confirming the higher polymerization of fabricated glass. The slightly different local environment of Eu3+ centers the results in a number of sites and causes inhomogeneous broadening of spectral lines. It was found that the local asymmetry ratio estimated by the relation of (5D0→7F2)/(5D0→7F1) transitions also confirms greater changes in local symmetry around Eu3+ ions. Our results indicate that modification of germanate glass by P2O5 allows control of their structural properties in order to functionalize the emissions for application as luminescent light sources and sensors.

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Section: Introductionmentioning

confidence: 99%

Luminescent Studies on Germanate Glasses Doped with Europium Ions for Photonic Applications

et al. 2020

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“…Germanate glasses are promising materials for optical applications for their high rare earth solubility, [1][2][3][4] wide transparence window from the UV to the infrared region, low photon energy (800 cm À1 ) when compared to silicate (1150 cm À1 ), 5,6 high refractive index and high thermal stability. 7 For applications in photonics, glassy systems with low phonon energy are required to minimize nonradiative processes in rare earth-doped glasses.…”

Section: Introductionmentioning

confidence: 99%

High niobium oxide content in germanate glasses: Thermal, structural, and optical properties

et al. 2017

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Niobium alkali germanate glasses were synthesized by the melt-quenching technique. The ternary system (90-x)GeO 2 -xNb 2 O 5 -10K 2 O forms homogeneous glasses with x ranging from 0 to 20 mol%. Samples were investigated by DSC and XRD analysis, FTIR and Raman spectroscopy, and optical absorption. Structural and physical features are discussed in terms of Nb 2 O 5 content. The niobium content increase in the glass network strongly modifies the thermal, structural and

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“…If we compare the spectroscopic properties determined for systems doped with Eu 3+ ions, it can be stated that due to the highest value of luminescence lifetime for 5 D 0 state, the glass with BaO is a good candidate for red-emitting materials, that may find potential use in photonic devices. According to previous studies, our phosphate system is characterized by longer luminesce lifetime than lead-free borate and germanate glasses [ 82 , 83 ]. The value of lifetime for 5 D 0 state of Eu 3+ ions in phosphate glass is close to the value evaluated for borate (1.81 ms) and silicate (2.17) systems with BaO as oxide modifier [ 77 , 78 ].…”

Section: Resultsmentioning

confidence: 99%

“…In comparison to other oxide phosphate glasses [ 79 , 80 ] the FWHM evaluated for the studied system is wider (44 nm). On the other hand, the value of this spectroscopic parameters is significantly lower than those of borate [ 83 ] and silicate glasses [ 90 ]. In case of luminescence decays from 4 I 13/2 state of Er 3+ ions it can be concluded that the lifetime value in studied phosphate glass is comparable to results obtained for phosphate [ 80 ] and silicate systems [ 90 ].…”

Section: Resultsmentioning

confidence: 99%

“…In case of luminescence decays from 4 I 13/2 state of Er 3+ ions it can be concluded that the lifetime value in studied phosphate glass is comparable to results obtained for phosphate [ 80 ] and silicate systems [ 90 ]. However, numerous studies have shown that the values of lifetimes are dependent critically on the glass composition and it is possible to synthesize the more efficiently-emitted materials [ 79 , 83 , 91 ].…”

Section: Resultsmentioning

confidence: 99%

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Influence of Oxide Glass Modifiers on the Structural and Spectroscopic Properties of Phosphate Glasses for Visible and Near-Infrared Photonic Applications

2020

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The effect of oxide modifiers on multiple properties (structural and spectroscopic) of phosphate glasses with molar composition 60P2O5-(10−x)Ga2O3-30MO-xEu2O3 and 60P2O5-(10−y)Ga2O3-30MO-yEr2O3 (where M = Ca, Sr, Ba; x = 0, 0.5; y = 0, 1) were systematically examined and discussed. The local structure of systems was evidenced by the infrared (IR-ATR) and Raman spectroscopic techniques. The spectroscopic behaviors of the studied glass systems were determined based on analysis of recorded spectra (excitation and emission) as well as luminescence decay curves. Intense red and near-infrared emissions (1.5 μm) were observed for samples doped with Eu3+ and Er3+ ions, respectively. It was found that the value of fluorescence intensity ratio R/O related to 5D0→7F2 (red) and 5D0→7F1 (orange) transition of Eu3+ ions depends on the oxide modifiers MO in the glass host. However, no clear influence of glass modifiers on the luminescence linewidth (FWHM) was observed for phosphate systems doped with Er3+ ions. Moreover, the 5D0 and 4I13/2 luminescence lifetimes of Eu3+ and Er3+ ions increase with the increasing ionic radius of M2+ (M = Ca, Sr, Ba) in the host matrix. The obtained results suggest the applicability of the phosphate glasses with oxide modifiers as potential red and near-infrared photoluminescent materials in photonic devices.

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Influence of MO/MF2 modifiers (M = Ca, Sr, Ba) on spectroscopic properties of Eu3+ ions in germanate and borate glasses

Cited by 19 publications

References 47 publications

Luminescent Studies on Germanate Glasses Doped with Europium Ions for Photonic Applications

Luminescent Studies on Germanate Glasses Doped with Europium Ions for Photonic Applications

High niobium oxide content in germanate glasses: Thermal, structural, and optical properties

Influence of Oxide Glass Modifiers on the Structural and Spectroscopic Properties of Phosphate Glasses for Visible and Near-Infrared Photonic Applications

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