Evolution of the spectral response of amorphous europium molybdate under annealing

Kiselev, A. M.; Шмурак, С. З.; Red’kin, B. S.; Синицын, В. В.; Шмытько, И. М.; Kudrenko, E. A.; Ponyatovskiĭ, E. G.

doi:10.1134/s1063783406080208

Cited by 29 publications

(12 citation statements)

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“…Molybdates are being considered as good hosts for luminescent materials due to their excellent thermal and chemical stability [8,9]. Up to now, many investigations on Eu 3+ -doped molybdate phosphors have been reported, but most of them were synthesized by a conventional solidstate reaction route, which usually requires high temperature, time-consuming heat treatment process, subsequent product grinding [10,11].…”

Section: Introductionmentioning

confidence: 99%

Luminescence properties and energy transfer process of Sm3+–Eu3+ co-doped molybdate red-emitting phosphors by hydrothermal method

et al. 2012

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Eu 3+ and Sm 3+ co-doped molybdate phosphors have been synthesized via hydrothermal method. The phosphors have the advantages of narrower particle size distribution and regular homogeneous shape. The luminescent properties of the molybdate phosphors were systematically studied. The introduction of Sm 3+ into the red-emitting phosphors can generate a strong excitation line at 405 nm, originating from the 6 H 5/2 → 4 K 11/2 transition of Sm 3+ , significantly extending the excitation region for matching the near-ultraviolet light-emitting diodes (−400 nm). Energy transfer from Sm 3+ to Eu 3+ was observed.

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Section: Introductionmentioning

confidence: 99%

Luminescence properties and energy transfer process of Sm3+–Eu3+ co-doped molybdate red-emitting phosphors by hydrothermal method

et al. 2012

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“…It should be particularly noted that the introduction of Eu 3+ ions into the sample makes it possible to monitor its structural state both in the volume and on the surface of the sample. It was shown in [13][14][15] that if the near-order around the Eu 3+ ions in the entire sample is the same, as evidenced by the coincidence of the luminescence spectra (LS) of the near-surface layer of the sample and its volume, then the sample is single-phase. Information about the nearest-neighbor environment of Eu 3+ ions in the crystal volume can be obtained by exciting the luminescence of Eu 3+ ions by light with an energy corresponding to the resonant excitation of Eu 3+ ions in the crystal transparency region (λ ex ~ 394 and ~466 nm, electronic transitions 7 F 0 → 5 L 6 and 7 F 0 → 5 D 2 , respectively) [1,2,[13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Evolution of Spectral and Structural Characteristics of Orthoborates Lu0.99 – xGdxEu0.01BO3

et al. 2021

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The structure, IR absorption and luminescence spectra of solid solutions of Lu 0.99 -x Gd x Eu 0.01 BO 3 at 0 ≤ x ≤ 0.15 were studied. The correspondence between the structure and spectral characteristics of these compounds was established. It is shown that at x ≤ 0.05, the orthoborates Lu 0.99 -x Gd x Eu 0.01 BO 3 , consisting of lutetium borate LuBO 3 , which has two stable structural modifications (calcite and vaterite), and gadolinium borate GdBO 3 , which has only one structural modification (vaterite), form a solid solution with a calcite structure and a microcrystal size of 15-20 μm. As x increases, the amount of vaterite phase increases sequentially, and at x ≥ 0.1, the entire volume of the sample has a vaterite structure. At Gd 3+ concentration in the range of 0.05 < x ≤ 0.1, the samples of Lu 0.99 -x Gd x Eu 0.01 BO 3 are two-phase. It is shown for the first time that at x > 0.05, the vaterite phase appears both in the volume of large microcrystals (15-20 μm) and in the form of small microcrystals (1-2 μm).

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“…Due to Mo-O and Mo-Mo bonds in the structure, it is also of interest for electronic properties such as phosphor-converted light emitting diodes (LEDs) [23,24]. 4 , and demonstrates the potential utility to map molybdate content in combined waste forms [27].…”

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Single phase melt processed powellite (Ba,Ca)MoO4 for the immobilization of Mo-rich nuclear waste

Brinkman

Fox

Marra

et al. 2013

Journal of Alloys and Compounds

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Crystalline and glass composite materials are currently being investigated for the immobilization of combined High Level Waste (HLW) streams resulting from potential commercial fuel reprocessing scenarios. Several of these potential waste streams contain elevated levels of transition metal elements such as molybdenum (Mo). Molybdenum has limited solubility in typical silicate glasses used for nuclear waste immobilization.Under certain chemical and controlled cooling conditions, a powellite (Ba,Ca)MoO 4 crystalline structure can be formed by reaction with alkaline earth elements. In this study, single phase BaMoO 4 and CaMoO 4 were formed from carbonate and oxide precursors demonstrating the viability of Mo incorporation into glass, crystalline or glass composite materials by a melt and crystallization process. X-ray diffraction, photoluminescence, and Raman spectroscopy indicated a long range ordered crystalline structure. In-situ electron irradiation studies indicated that both CaMoO 4 and BaMoO 4 powellite phases exhibit radiation stability up to 1000 years at anticipated doses with a crystalline to *Manuscript Click here to view linked References amorphous transition observed after 1 X 10 13 Gy. Aqueous durability determined from product consistency tests (PCT) showed low normalized release rates for Ba, Ca, and Mo (<0.05 g/m 2 ).

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Evolution of the spectral response of amorphous europium molybdate under annealing

Cited by 29 publications

References 7 publications

Luminescence properties and energy transfer process of Sm3+–Eu3+ co-doped molybdate red-emitting phosphors by hydrothermal method

Luminescence properties and energy transfer process of Sm3+–Eu3+ co-doped molybdate red-emitting phosphors by hydrothermal method

Evolution of Spectral and Structural Characteristics of Orthoborates Lu0.99 – xGdxEu0.01BO3

Single phase melt processed powellite (Ba,Ca)MoO4 for the immobilization of Mo-rich nuclear waste

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