Up-conversion luminescence properties of Ho3+-Yb3+ Co-doped transparent glass ceramics containing Y2Ti2O7

Yu, Xinmin; Zhao, Tong; Wang, Tong; Bao, Wenli; Su, Chunhui

doi:10.1016/j.jnoncrysol.2021.121163

Cited by 12 publications

(4 citation statements)

References 25 publications

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“…The reason behind this is that when the temperature for heat treatment is excessively high, it leads to the formation of larger NaGd(MoO 4 ) 2 crystals, resulting in agglomeration and thereby reducing the distance between the crystals. As the distance between Dy 3+ ions within the crystal gradually decreases, the likelihood of NR transitions between these ions increases 86,87 . The NR transition, which consumes energy without contributing to luminescence, is responsible for the decrease in luminous performance when the heat treatment temperature is too high.…”

Section: Resultsmentioning

confidence: 99%

“…As the distance between Dy 3+ ions within the crystal gradually decreases, the likelihood of NR transitions between these ions increases. 86,87 The NR transition, which consumes energy without contributing to luminescence, is responsible for the decrease in luminous performance when the heat treatment temperature is too high.…”

Section: Fluorescence Performances Of Glass-ceramicsmentioning

confidence: 99%

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Dy³⁺‐ and/or Sm³⁺‐doped glass–ceramics containing NaGd(MoO₄)₂ crystalline phase for warm white light applications

Tong,

Luo,

Liu

et al. 2024

J Am Ceram Soc.

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The transparent glass–ceramics with Dy3+ and/or Sm3+ doping, which include the NaGd(MoO4)2 single‐crystal phase, were synthesized using the melt‐quenching method followed by heat treatment in the SiO2–B2O3–Na2O–ZnO–MoO3–Gd2O3 system. The formation and fluorescent properties of Dy3+ single‐doped precursor glasses were thoroughly examined, and the optimal doping amount of Dy2O3 was determined to be 0.3 mol% by fluorescence spectroscopy. The ideal heat treatment procedure for glass–ceramics containing Dy3+ and Sm3+ was determined to be crystallized at a temperature of 650°C for a duration of 7 h. After undergoing heat treatment, the luminescence performance of glass–ceramic is significantly boosted, exhibiting an improvement that is roughly twice as substantial when compared to the precursor glass. Extensive research has been conducted to thoroughly examine the fluorescence capabilities of glass–ceramics doped with both Dy3+ and Sm3+, and the intricate mechanism of energy transfer has been extensively explored. The transparent glass–ceramics doped with Dy3+ and Sm3+ and containing NaGd(MoO4)2 crystal phase can produce tunable luminescence from yellow to orange with a high color purity and a low correlated color temperature, which indicates that they have the potential to be applied to warm white light scenes such as household lighting under ultraviolet excitation.

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Section: Resultsmentioning

confidence: 99%

Section: Fluorescence Performances Of Glass-ceramicsmentioning

confidence: 99%

Dy³⁺‐ and/or Sm³⁺‐doped glass–ceramics containing NaGd(MoO₄)₂ crystalline phase for warm white light applications

Tong,

Luo,

Liu

et al. 2024

J Am Ceram Soc.

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“…The visible UCL increases with the increase of Ho 3+ concentrations within a low concentration range and reaches the maximum at 0.4 mol% Ho 3+ , and then decreases sharply with the increase of Ho 3+ ions again. Analysis of this phenomenon proves that concentration quenching plays an important role [27]. The increase of Ho 3+ concentration promotes an increase in rare-earth-ion pair formation in the SrF 2 lattice which correspondingly reduces the distance between Ho 3+ ions compared the Yb 3+ -Ho 3+ ions, thus facilitating the occurrence of cross-relaxation (CR) between the adjacent Ho 3+ ions [28][29].…”

Section: And Ucl Propertiesmentioning

confidence: 99%

Boltzmann- and non-Boltzmann-based thermometers in the first, second and third biological windows for the SrF2:Yb3+,Ho3+ nanocrystals under 980, 940 and 915 nm excitations

Wang

Yuan

et al. 2022

Preprint

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Spectrally determination of temperature based on the lanthanide-doped nanocrystals (NCs) is a vital strategy to noninvasively measure the temperature in practical applications. Here, we synthesized a series of SrF2:Yb3+/Ho3+ NCs and simultaneously observed the efficient visible upconversion luminescence (UCL) and near-infrared (NIR) downconversion luminescence (DCL) under 980, 940 and 915 nm excitations. Subsequently, these NCs were further utilized for thermometers based on the Boltzmann (thermally-coupled levels, TCLs) and non-Boltzmann (non-thermally-coupled levels, NTCLs) of Ho3+ ions in the first (~ 650 nm), second (~ 1012 nm) and third (~ 2020) biological windows (BW-I, BW-II and BW-III) under tri-wavelength excitations. The thermometric parameters including the relative sensitivity (\({S_{\text{r}}}\)) and temperature uncertainty (\(\delta T\)) are quantitatively determined on the I648/I541 (BW-I), I1186/I1012 (BW-II), and I1950/I2020 (BW-III) transitions of Ho3+ ions in the temperature range of 303–573 K. Comparative experimental results demonstrated that the thermometer has superior performances.

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“…There are two nonequivalent oxygen sites: one is surrounded by two Y 3+ and two Ti 4+ , and the other is only surrounded by Y 3+ cations . So far, Y 2 Ti 2 O 7 nanocrystals or thin films have been synthesized by varied methods such as hydrothermal processes, solid-state reaction, sol–gel processes, and mechanical milling. − Due to its excellent properties, Y 2 Ti 2 O 7 has been found to be a host material for oxygen ion conductors, optical emission, solid oxide fuel cells, and photovoltaic applications, an alternative material to immobilize nuclear solid waste, and a potential photocatalyst for water splitting. − …”

Section: Introductionmentioning

confidence: 99%

Tailoring Structural, Electronic, Optical, and Photocatalytic Properties of Y₂Ti₂O₇ through a Passivated Codoping Approach

Yang,

Li,

Dong

et al. 2024

J. Phys. Chem. C

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The large band gap of the Y 2 Ti 2 O 7 photocatalyst has limited its application only in the ultraviolet region. To enhance its photocatalytic activity for overall water splitting in the visible-light region, we have utilized a passivated codoping approach to construct eleven (X + M)-doped Y 2 Ti 2 O 7 systems (X = C, N, M = Ti, V, Zr, Nb, Mo, Hf, Ta, W), where a Ti/Y site is replaced with a metal dopant. The calculated negative formation energies indicate that all of the (X + M)-doped systems are easy to synthesize, especially under the O-rich condition. The implantation of dopants can change the crystal structure to different extents. The less the deformation of the crystal, the easier the formation of the (X + M)-doped Y 2 Ti 2 O 7 . The passivated codoping can effectively narrow the band gap without generating isolated defect states in the forbidden gap. (X + M)doped Y 2 Ti 2 O 7 retains the direct band gap characteristics and possesses the separation rate of photogenerated carriers similar to or even higher than that of the pure crystal. Compared to (N + M)-doped systems, (C + M)-doped systems exhibit more remarkable influence on narrowing the band gap and extending the absorption edge mainly because the C dopant has deeper acceptor energy levels and a stronger interaction with the metal dopant than the N dopant. The capabilities of photooxidation and photoreduction of water have been enhanced by adopting the codoping strategy. By considering the binding energy, band gap, optical absorption, and the relative position of band edges, we propose that (C + Mo)-, (C + W)-, (N + V)-, (C + V)-, (C + Nb)-and (C + Ta)-doped Y 2 Ti 2 O 7 are potential visible-light-responsive photocatalysts for overall water splitting.

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Up-conversion luminescence properties of Ho3+-Yb3+ Co-doped transparent glass ceramics containing Y2Ti2O7

Cited by 12 publications

References 25 publications

Dy³⁺‐ and/or Sm³⁺‐doped glass–ceramics containing NaGd(MoO₄)₂ crystalline phase for warm white light applications

Dy³⁺‐ and/or Sm³⁺‐doped glass–ceramics containing NaGd(MoO₄)₂ crystalline phase for warm white light applications

Boltzmann- and non-Boltzmann-based thermometers in the first, second and third biological windows for the SrF2:Yb3+,Ho3+ nanocrystals under 980, 940 and 915 nm excitations

Tailoring Structural, Electronic, Optical, and Photocatalytic Properties of Y₂Ti₂O₇ through a Passivated Codoping Approach

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Up-conversion luminescence properties of Ho3+-Yb3+ Co-doped transparent glass ceramics containing Y2Ti2O7

Cited by 12 publications

References 25 publications

Dy3+‐ and/or Sm3+‐doped glass–ceramics containing NaGd(MoO4)2 crystalline phase for warm white light applications

Dy3+‐ and/or Sm3+‐doped glass–ceramics containing NaGd(MoO4)2 crystalline phase for warm white light applications

Boltzmann- and non-Boltzmann-based thermometers in the first, second and third biological windows for the SrF2:Yb3+,Ho3+ nanocrystals under 980, 940 and 915 nm excitations

Tailoring Structural, Electronic, Optical, and Photocatalytic Properties of Y2Ti2O7 through a Passivated Codoping Approach

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Dy³⁺‐ and/or Sm³⁺‐doped glass–ceramics containing NaGd(MoO₄)₂ crystalline phase for warm white light applications

Dy³⁺‐ and/or Sm³⁺‐doped glass–ceramics containing NaGd(MoO₄)₂ crystalline phase for warm white light applications

Tailoring Structural, Electronic, Optical, and Photocatalytic Properties of Y₂Ti₂O₇ through a Passivated Codoping Approach