Three primary colors emitting from Er3+–Eu3+ co-doped oxygen-deficient glasses

Geng, Li; Luo, Fa; Pan, Huaihai; Chen, Qing‐Xi; Chen, Danping; Qiu, Jianrong; Zhao, Qian

doi:10.1016/j.jallcom.2011.03.095

Cited by 23 publications

(3 citation statements)

References 31 publications

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“…The band gap in inorganic glasses depends mainly on two factors: the atomic number of anions and cations, and the proportion of nonbridging oxygen (NBO) ions in glass . The radius of Eu–O bond length is slightly greater than La–O bond length in view of the well‐known lanthanide contraction, the partial substitution of La 2 O 3 for Eu 2 O 3 may effectively open glass network, which results in the increasing number of nonbridge oxygen, and leading to the obvious decreasing of the band gap and the red shift of the cut‐off edge.…”

Section: Resultsmentioning

confidence: 99%

Eu³⁺‐Activated Borogermanate Scintillating Glass with a High Gd₂O₃ Content

et al. 2013

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Eu3+‐activated borogermanate scintillating glasses with compositions of 25B2O3–40GeO2–25Gd2O3–(10−x)La2O3–xEu2O3 were prepared by melt‐quenching method. Their optical properties were studied by transmittance, photoluminescence, Fourier transform infrared (FTIR), Raman and X‐ray excited luminescence (XEL) spectra in detail. The results suggest that the role of Gd2O3 is of significance for designing dense glass. Furthermore, energy‐transfer efficiency from Gd3+ to Eu3+ ions can be near 100% when the content of Eu2O3 exceeds x = 4, the corresponding critical distance for Gd3+–Eu3+ ion pairs is estimated to be 4.57 Å. The strongest emission intensities of Eu3+ ions under both 276 and 394 nm excitation are simultaneously at the content of 8 mol% Eu2O3. The degree of Eu–O covalency and the local environment of Eu3+ ions are evaluated by the value of Ωt parameters from Judd–Ofelt analysis. The calculated results imply that the covalency of Eu–O bond increases with the increasing concentration of Eu3+ ions in the investigated borogermanate glass. As a potential scintillating application, the strongest XEL intensity under X‐ray excitation is found to be in the case of 6 mol% Eu2O3, which is slightly different from the photoluminescence results. The possible reason may be attributed to the discrepancy of the excitation mechanism between the ultraviolet and X‐ray energy.

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Section: Resultsmentioning

confidence: 99%

Eu³⁺‐Activated Borogermanate Scintillating Glass with a High Gd₂O₃ Content

et al. 2013

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“…In particular, the bond strength of the oxygen atom with other elements, which determines the position of the absorption edge, varies as a result of the formation of a large number of non-bridging oxygen atoms [26] if the erbium oxide content exceeds 0.5% [27]. Such oxygen atoms are bonded to excited electrons less strongly and this leads to significant changes in the optical band gap [28].…”

Section: Optical Band Gap and Urbach Energymentioning

confidence: 99%

Influence of Eu³⁺ ions on 1.5 µm luminescence of Er³⁺ in TeO₂–ZnO–Bi₂O₃ glasses

Savikin,

Sumachev,

Krasnov

et al. 2023

Laser Phys. Lett.

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TeO2–ZnO–Bi2O3 glasses doped with Eu3+ and Er3+ ions were prepared and investigated for their physical, optical, and luminescent properties. The optical band gap is calculated for the indirect transition and is within the 3.04–3.10 eV range. The Urbach energy varies from 0.135 to 0.098 eV with the increase in Eu3+ compound content. Bi2Te2O8 and ZnTeO3 complex oxide phases are generated in the mixture as intermediate compounds in the course of charge thermal processing. The additional doping of TeO2–ZnO–Bi2O3:Er3+ glass samples with Eu3+ ions is shown to lead to the appearance of cross-relaxation channels of the Er3+ ion states and decreases the population of the 4I13/2 state of the Er3+ ions. Simultaneously, the excited 4I11/2 state of the Er3+ ions is also subjected to strong cross-relaxation decay. The Eu3+ ions are shown to decrease the 4I13/2 level population of Er3+ ions, which may facilitate the attainment of population inversion if the 4I13/2 level is at the lower level of the laser transition.

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“…1(up) [7], spectrum modulation by converting the UV-visible photons into near-infrared (NIR) photons below the band gap of c-Si (1.12 eV) where c-Si solar cells exhibit their greatest spectral response, can enhance the energy conversion efficiencies of the c-Si solar cells [8]. Recently, the down-conversion (DC) process which is based on the principle of converting every incident UV-blue photon into at least two NIR photons, has been realized with the rare earth (RE) ion-pairs such as Tb 3+ -Yb 3+ , Tm 3+ -Yb 3+ and Pr 3+ -Yb 3+ [9][10][11][12]. The theoretical maximum quantum efficiency can reach nearly 200%.…”

Section: Introductionmentioning

confidence: 99%