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Holmium/ytterbium-codoped bisumth tungstate fluorescent powder and preparation method thereof

A phosphor powder and co-doping technology is applied in the field of new functional materials to achieve the effects of wide adjustable range of parameters, high purity and simple raw materials

Inactive Publication Date: 2017-05-31
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there is no relevant report on the preparation of holmium and ytterbium co-doped bismuth tungstate phosphors by hydrothermal method combined with heat treatment process

Method used

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  • Holmium/ytterbium-codoped bisumth tungstate fluorescent powder and preparation method thereof
  • Holmium/ytterbium-codoped bisumth tungstate fluorescent powder and preparation method thereof
  • Holmium/ytterbium-codoped bisumth tungstate fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Dissolve 1.46g of bismuth nitrate pentahydrate in 30mL of ethylene glycol solution, and dissolve 0.49g of sodium tungstate in 30mL of dilute nitric acid solution with a concentration of 0.6mol / L; mix the above two solutions evenly, and use 2mol / L L sodium hydroxide adjusts the pH of the solution to 5;

[0037](2) Move to a hydrothermal reaction kettle, and place in a blast drying oven and heat to 180°C for hydrothermal treatment for 2 hours;

[0038] (3) Naturally cool to room temperature after taking it out, centrifuge the obtained product, wash with deionized water and absolute ethanol three times respectively, dry at 80° C. for 12 hours, and grind to obtain bismuth tungstate powder.

[0039] figure 1 It is the powder XRD pattern of bismuth tungstate. The position of each characteristic diffraction peak of the sample is consistent with the JCPDS card No.39-0256 standard card of the orthorhombic crystal system. It belongs to the orthorhombic crystal system. The sp...

Embodiment 2

[0041] (4) Dissolve 1.46g of bismuth nitrate pentahydrate in 30mL of ethylene glycol solution, and dissolve 0.49g of sodium tungstate in 30mL of dilute nitric acid solution with a concentration of 0.6mol / L; mix the above two solutions evenly;

[0042] (5) 0.0085g of holmium oxide and 0.0443g of ytterbium oxide were dissolved in nitric acid solution with a mass concentration of 20%, and then added dropwise to the above mixed solution, and the pH of the solution was adjusted to 5 with 2mol / L sodium hydroxide;

[0043] The suspension was moved to a hydrothermal reaction kettle, hydrothermally treated at 180°C for 2 hours, then cooled to room temperature, the obtained product was centrifuged, washed three times with deionized water and absolute ethanol, and dried at 80°C for 12 hours;

[0044] (1) The ground product was calcined and kept in a muffle furnace at 550°C for 4 hours, and then ground again to obtain holmium-ytterbium co-doped bismuth tungstate Bi 1.94 Ho 0.01 Yb 0.05 ...

Embodiment 3

[0047] (1) Dissolve 1.46g of bismuth nitrate pentahydrate in 30mL of ethylene glycol solution, and dissolve 0.49g of sodium tungstate in 30mL of dilute nitric acid solution with a concentration of 0.6mol / L; mix the above two solutions evenly;

[0048] (2) Dissolving 0.0085g of holmium oxide and 0.0443g of ytterbium oxide in a nitric acid solution with a mass concentration of 20%, then adding the above mixed solution dropwise, and adjusting the pH of the solution to 5 with 2mol / L sodium hydroxide;

[0049] (3) Move the suspension to a hydrothermal reaction kettle, hydrothermally treat it at 200°C for 2 hours, then cool to room temperature, centrifuge the obtained product, wash with deionized water and absolute ethanol three times, and dry at 80°C 12 hours;

[0050] (4) The ground product was calcined and kept in a muffle furnace at 600°C for 4 hours, and then ground again to obtain holmium-ytterbium co-doped bismuth tungstate Bi 1.94 Ho 0.01 Yb 0.05 WO 6 powder.

[0051] ...

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Abstract

The invention discloses a holmium / ytterbium-codoped bisumth tungstate fluorescent powder and a preparation method thereof. The preparation method comprises the following steps: by using bismuth nitrate pentahydrate, sodium tungstate, holmium oxide and ytterbium oxide as raw materials and ethanediol and dilute nitric acid as solvents, mixing the solution according to the stoichiometric proportion of Bi(2-x-y)HoxYbyWO6 (0<=x<2, and 0<=y<2) to form a uniform suspension, carrying out high-temperature reaction in a hydrothermal reaction kettle, centrifugating, washing, drying, and carrying out heat treatment to obtain the holmium / ytterbium-codoped bisumth tungstate fluorescent powder. The mixing ratio and the technological parameters for hydrothermal treatment, heat treatment and the like are controlled in the preparation process to obtain the powder with different fluorescence intensity levels. The preparation method has the advantages of simple technique and procedure, wide parameter adjustable range, high repeatability and low cost, and has commercial prospects. The fluorescent powder has important application values in the fields of ceramic raw powder, visible-light photocatalysis, solar cells and photoelectric sensors.

Description

technical field [0001] The invention belongs to the technical field of new functional materials, and specifically relates to a method for preparing holmium-ytterbium co-doped bismuth tungstate fluorescent powder, in particular to a simple hydrothermal method combined with a heat treatment process to prepare holmium-ytterbium co-doped bismuth tungstate powder Methods. Background technique [0002] Since the upconversion phenomenon was first reported by Auzel et al. in 1960, upconversion luminescence has become a research hotspot because it can transform low-energy near-infrared light into high-energy visible or ultraviolet light through multiphoton absorption or energy transfer processes. Rare earth ions (Er 3+ 、Ho 3+ 、Tm 3+ 、Nd 3+ )-doped upconversion luminescent materials have shown potential application prospects in optical temperature sensors, display devices, medical diagnosis, catalysts and solar cells. Rare earth ions and host materials are important factors affec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78B01J23/31
CPCC09K11/7776B01J23/002B01J23/31B01J2523/00B01J35/39B01J2523/69B01J2523/54B01J2523/3768B01J2523/3787
Inventor 郝洪顺李红靳闪闪侯红漫付怀东刘妍君张公亮闫爽刘贵山高文元
Owner DALIAN POLYTECHNIC UNIVERSITY
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