Microsphere morphology tuning and photo-luminescence properties of monoclinic Y2WO6

Bai, Yuebin; Zhang, Junying; Tang, Zilong

doi:10.1016/j.jcrysgro.2015.02.005

Cited by 7 publications

(3 citation statements)

References 23 publications

(24 reference statements)

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“…The up conversion process in Y2WO6 based phosphors [28][29][30][31] has also received some attention, with suggestions for application in solar cells [32] or optical thermometry [33][34][35]. Y2WO6 has also been found to be a suitable matrix for the fabrication of phosphors with a controlled structure at the nanoscale [36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Electronic, structural, and optical properties of Y2WO6, a host material for inorganic phosphors

Alemany

Llanos

2020

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Electronic, structural, and optical properties of Y2WO6, a host material for inorganic phosphors

Alemany

Llanos

2020

Journal of Alloys and Compounds

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“…44 Lu 2 WO 6 space group and crystal parameters were similar to those of Y 2 WO 6 . As we know, different synthesis conditions such as solution PH values in hydrothermal process can change monoclinic Y 2 WO 6 luminescence intensity, 45 and many activators like Sm 3+ , Tb 3+ , and Dy 3+ were doped into Y 2 WO 6 to obtain different luminescence phenomena. 46 When other activator ions like Sm 3+ , Yb 3+ , and Dy 3+ were doped into Lu 2 WO 6 samples, these doping samples should show tunable luminescence phenomena.…”

Section: Introductionmentioning

confidence: 99%

Monoclinic Lu_2–xSm_xWO₆-Based White Light-Emitting Phosphors: From Ground–Excited-States Calculation Prediction to Experiment Realization

Zhang¹,

Ding²,

Yin

et al. 2017

Inorg. Chem.

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Through ground state and constrained density function calculations, Sm ions luminescence in self-activated monoclinic LuWO was originated from intra 4f → 4f transitions, not inter 5d → 4f transitions. Theoretically the white luminescence was obtained by combining red and blue-green emissions of 4f energy levels and W-O charge transfer transitions. Experimentally, pure and Sm doping LuWO powders were synthesized using solid phase reaction calcined in air atmosphere. By the analysis of X-ray photoelectron spectroscopy and Rietveld refinement, element Sm charge state was trivalent, and Sm doping was concentration-dependent selectively doping in three Lu sites. With the increase of Sm concentrations, the color coordinates changed gradually from blue (0.17, 0.17) through white light (0.33, 0.25) toward orange (0.44, 0.32) in the visible spectral under 325 nm excitation. On the basis of the theoretical prediction and experimental preparation, a white emission LED lamp was produced using a 365 nm ultraviolet chip and LuSmWO phosphor. The present design method can be applied to select excellent activators from a large number of rare-earth (Re) ions like Sm and Eu or non-Re ions like Bi and Mn in various matrixes.

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“…Moreover, undoped tungstates often show the self-activated luminescence due to the electronic transition between O 2and W 6+ . 8,9 Rare-earth-activated tungstates would then exhibit a competitive switching of the selfactivated and the activated luminescence, leading to the occurrence of fluorochromism. We report herein the synthesis of undoped and Ln 3+doped CaWO 4 (Ln 3+ = Eu 3+ , Tb 3+ ) by the hydrothermal method.…”

mentioning

confidence: 99%

Fluorochromic Properties of Undoped and Ln³⁺-Doped CaWO₄Phosphor Particles

Tsuchiya

Hagiwara

Fujihara

2018

ECS J. Solid State Sci. Technol.

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Undoped and Ln 3+ -doped (Ln 3+ = Eu 3+ , Tb 3+ ) CaWO 4 phosphor particles were synthesized by a hydrothermal method, aiming at generating fluorochromic properties in response to redox reactions. The phosphor particles obtained were first treated with an aqueous L(+)-ascorbic acid solution as a reductant at room temperature, which resulted in a considerable decrease in photoluminescence (PL) intensity of both CaWO 4 (the host-lattice blue emission) and CaWO 4 :Ln 3+ (the 4f-4f red or green emission). The quenched PL could then be recovered by treating the particles with a sodium hypochlorite solution as an oxidant also at room temperature. This PL switching behavior was predominantly caused by redox reactions between the solid particles and the redox species in the solutions based on a change of W 6+ /W 5+ valance states of the CaWO 4 host crystal. More interestingly, CaWO 4 :Eu 3+ exhibited a change of emission colors, depending on the excitation wavelength, due to different sensitivity of the host emission and the Eu 3+ emission to the redox treatment. Such a changeable fluorochromism is regarded as a newly developed function of the phosphor materials for use in facile optical detectors and sensors.

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Microsphere morphology tuning and photo-luminescence properties of monoclinic Y2WO6

Cited by 7 publications

References 23 publications

Electronic, structural, and optical properties of Y2WO6, a host material for inorganic phosphors

Electronic, structural, and optical properties of Y2WO6, a host material for inorganic phosphors

Monoclinic Lu_2–xSm_xWO₆-Based White Light-Emitting Phosphors: From Ground–Excited-States Calculation Prediction to Experiment Realization

Fluorochromic Properties of Undoped and Ln³⁺-Doped CaWO₄Phosphor Particles

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Microsphere morphology tuning and photo-luminescence properties of monoclinic Y2WO6

Cited by 7 publications

References 23 publications

Electronic, structural, and optical properties of Y2WO6, a host material for inorganic phosphors

Electronic, structural, and optical properties of Y2WO6, a host material for inorganic phosphors

Monoclinic Lu2–xSmxWO6-Based White Light-Emitting Phosphors: From Ground–Excited-States Calculation Prediction to Experiment Realization

Fluorochromic Properties of Undoped and Ln3+-Doped CaWO4Phosphor Particles

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Monoclinic Lu_2–xSm_xWO₆-Based White Light-Emitting Phosphors: From Ground–Excited-States Calculation Prediction to Experiment Realization

Fluorochromic Properties of Undoped and Ln³⁺-Doped CaWO₄Phosphor Particles