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YVO4:Eu3/YPO4 core-shell structure nano-fluorescent powder and preparation method thereof

A technology of nano-fluorescent powder and core-shell structure, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of low luminous efficiency and achieve simple production process, convenient operation, and good combination

Inactive Publication Date: 2011-07-13
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Due to simple YVO 4 :Eu 3+ There are many surface defects in nano phosphor powder, which leads to problems such as low luminous efficiency. The purpose of the present invention is to provide a YVO 4 :Eu 3+ / YPO 4 Nano-fluorescent powder with core-shell structure and preparation method thereof, yttrium phosphate YPO with stable chemical properties and good light transmittance 4 Wrapped to YVO 4 :Eu 3+ On the surface of nano-phosphor, forming a core-shell structure nano-phosphor

Method used

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  • YVO4:Eu3/YPO4 core-shell structure nano-fluorescent powder and preparation method thereof
  • YVO4:Eu3/YPO4 core-shell structure nano-fluorescent powder and preparation method thereof
  • YVO4:Eu3/YPO4 core-shell structure nano-fluorescent powder and preparation method thereof

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Effect test

Embodiment 1

[0022] Preparation of YVO 4 :Eu 3+ / YPO 4 Nano fluorescent powder with core-shell structure, in which the doping concentration of europium is 8%, and the molar ratio of core-shell is 1:2, prepared by two-step hydrothermal method.

[0023] The first step, hydrothermal preparation of YVO 4 :Eu 3+ Core, the specific process is as follows: 1) 2.678 grams of yttrium nitrate Y (NO 3 ) 3 ·6H 2 O (7.0 mmol) and 0.271 g of europium nitrate Eu (NO 3 ) 3 ·6H 2 O (0.6 mmol) was dissolved in 190 mL deionized water. Now, europium ions account for 8% of rare earth ions, and the total molar concentration of rare earth ions is 0.040 moles / liter; 2) add 1.200 grams of sodium metavanadate NaVO in the above solution 3 2H 2 O (7.6 mmol); 3) the above solution is poured into an autoclave with a volume of 200 milliliters, and the degree of filling is 95%. After the autoclave is hydrothermally treated at 150° C. for 120 hours, it is cooled to room temperature; 4) the The final solution wa...

Embodiment 2

[0027] Preparation of YVO 4 :Eu 3+ / YPO 4 Nano fluorescent powder with core-shell structure, in which the doping concentration of europium is 5%, and the molar ratio of core-shell is 2:1, prepared by two-step hydrothermal method.

[0028] The first step, hydrothermal preparation of YVO 4 :Eu 3+ Core, the specific process is as follows: 1) 6.550 grams of Y (NO 3 ) 3 ·6H 2 O (17.1 mmol) and 0.401 g Eu (NO 3 ) 3 ·6H 2 O (0.9 mmol) was dissolved in 180 milliliters of deionized water, at this time, europium ions accounted for 5% of the total rare earth ions, and the total molar concentration of rare earth nitrates was 0.100 mol / liter; 2) 2.106 grams of metavanadic acid were added to the above solution Ammonia NH 4 VO 3 (18.0 mmol), stirring; 3) put the final prepared solution into an autoclave with a volume of 200 milliliters, and the filling degree is 90%. After the autoclave is hydrothermally treated at 180° C. for 100 hours, it is cooled to room temperature ; 4) Cent...

Embodiment 3

[0032] Preparation of YVO 4 :Eu 3+ / YPO 4 Nano fluorescent powder with core-shell structure, wherein the doping concentration of europium is 3%, and the molar ratio of core-shell is 4:1, prepared by two-step hydrothermal method.

[0033] The first step, hydrothermal preparation of YVO 4 :Eu 3+ Core, the specific process is as follows: 1) 14.861 grams of Y (NO 3 ) 3 ·6H 2 O (38.8 mmol) and 0.535 g Eu (NO 3 ) 3 ·6H 2 O (1.2 millimoles) was dissolved in 160 milliliters of deionized water. At this time, europium ions accounted for 3% of the total rare earth ions, and the total molar concentration of rare earth nitrates was 0.250 mol / liter; 2) Add 5.522 grams of metavanadate to the above solution Potassium KVO 3 (40.0 mmol), stirring; 3) Pour the prepared solution into a 200 ml autoclave with a filling degree of 80%. After the autoclave was hydrothermally treated at 200°C for 60 hours, it was cooled to room temperature; 4) the processed The solution was centrifuged and w...

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Abstract

The invention discloses YVO4: Eu<3+> / YPO4 core-shell structure nano-phosphor powder and a preparation method thereof. The core-shell structure phosphor powder is achieved by coating YPO4 on the surface of YVO4: Eu<3+>. YPO4 is the same with YVO4 in structure with close lattice parameters. The surface defects of YVO4: Eu<3+> nano-luminescent granule can be minimized so that the luminous efficiency is improved by 5 to 30 percent compared with the luminous efficiency of pure YVO4: Eu<3+> nano-powder. The molarity of the core europium of YVO4: Eu<3+> is 1 to 8 percent. The mol ratio of the core of YVO4: Eu<3+> and the shell of YPO4 is 1:2-8:1. The particle size of the phosphor powder is 30 to 100 nanometers. The two-step hydrothermal method is adopted; YVO4: Eu<3+> nano-luminescent granule is hydrothermally synthesized in water at 250 DEG C. Subsequently, YPO4 is coated on the surface of the nano-core under hydrothermal conditions, thus getting the core / crust structure nano-phosphor powder. The preparation method of the invention has simple production process and convenient operation, which is applicable for large-scale industrialized production.

Description

technical field [0001] The invention relates to a luminescent material, in particular to a YVO 4 :Eu 3+ / YPO 4 Nano fluorescent powder with core-shell structure and preparation method thereof. Background technique [0002] Rare earth luminescent materials are particularly attractive because of their rich and varied fluorescence characteristics, high color purity of luminescence, high luminescence conversion efficiency and stable chemical properties. After decades of development, rare earth luminescent materials have become an important class of functional materials, widely used in fluorescent lamps, plasma flat panel displays, field emission displays and X-ray imaging technology and other fields. Among the many rare earth luminescent materials, europium-doped yttrium vanadate YVO 4 :Eu 3+ Phosphor powder is one of the important red light-emitting materials. It has the advantages of high quantum efficiency, large luminous flux, and good color rendering. It has been comme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78
Inventor 祝洪良左佃太顾小云王正凯姚奎鸿
Owner ZHEJIANG SCI-TECH UNIV
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