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Preparation method of rare earth-doped calcium tungstate phosphor

A technology of rare earth doping and calcium tungstate, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of phosphor luminous intensity or luminous wavelength influence, and achieve low production cost, cheap price and simple preparation process.

Inactive Publication Date: 2010-12-22
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The phosphors prepared by the above methods are often doped with other anions, which will affect the luminous intensity or wavelength of the phosphors.

Method used

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  • Preparation method of rare earth-doped calcium tungstate phosphor
  • Preparation method of rare earth-doped calcium tungstate phosphor
  • Preparation method of rare earth-doped calcium tungstate phosphor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take the commercially available cuttlefish bone, peel off the skin, and take its spongy inner layer for later use. Weigh 0.30g of peeled spongy cuttlebone in the reaction kettle, then weigh 0.75g of ammonium tungstate so that the mass ratio of peeled spongy cuttlebone to ammonium tungstate is 2:5, and place in the reaction In the kettle, weigh 0.043g (0.1mmol) of La(NO 3 ) 3 ·6H 2 O is placed in a reaction kettle, 10ml of distilled water is added, sealed, and reacted in an oven at a temperature of 120° C. for one day. Cool to room temperature, rinse with distilled water, and then dry at 100°C for 2h, take a small piece of sample and calcinate at 200°C, 600°C and 900°C for 2h respectively to obtain calcium tungstate phosphor doped with rare earth lanthanum .

[0024] Fluorescence tests were carried out on the calcined samples respectively. Fluorescence analysis showed ( figure 1 ), when calcined to above 700°C, the product has a higher luminous intensity at 414nm u...

Embodiment 2

[0026] Take cuttlefish bones available in the market, peel off the skin, take the spongy inner layer, cut into blocks, and set aside. Weigh 0.30g of peeled spongy cuttlebone in the reaction kettle, then weigh 0.50g of ammonium tungstate, make the mass ratio of peeled spongy cuttlebone to ammonium tungstate be 3:5, place in In the reactor, weigh 0.044g (0.1mmol) of Nd(NO 3 ) 3 ·6H 2 O was placed in a reaction kettle, 10ml of distilled water was added, sealed, and reacted at a temperature of 160°C for one day. Cool to room temperature, rinse with distilled water, and then dry at 120°C for 3 hours, take a small piece of sample and calcinate at 200°C, 600°C and 900°C for 2 hours respectively to obtain calcium tungstate phosphor doped with rare earth neodymium .

[0027]Fluorescence tests were carried out on the calcined samples respectively. Fluorescence analysis showed ( figure 2 ), when calcined to above 600°C, the product has a higher luminous intensity at 413nm under th...

Embodiment 3

[0029] Take the commercially available cuttlefish bone, peel off the skin, take its spongy inner layer, cut it into blocks, and set aside. Weigh 0.40g of peeled sponge cuttlebone in the reactor, then weigh 0.50g of ammonium tungstate so that the mass ratio of peeled sponge cuttlebone to ammonium tungstate is 4:5, and place it in the reactor Inside, weigh 0.034g (0.1mmol) of Tb(NO 3 ) 3 ·6H 2 O was placed in a reaction kettle, 10ml of distilled water was added, sealed, and reacted at a temperature of 180°C for one day. Cool to room temperature, rinse with distilled water, and dry at 150°C for 5 hours. Take a small piece of sample and calcinate at 200°C, 600°C and 900°C for 2 hours to obtain rare earth terbium-doped calcium tungstate phosphor .

[0030] Fluorescence tests were carried out on the calcined samples respectively. Fluorescence analysis showed ( image 3 ), when calcined to above 900°C, the product has higher luminous intensity at 383nm, 417nm and 438nm under th...

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Abstract

The invention discloses a preparation method of rare earth-doped calcium tungstate phosphor, comprising the steps of: by taking a peeled sponge-shaped cuttlebone as a main raw material, adding a proper amount of calcium tungstate and then adding rare earth nitrate to perform reaction for 24 hours at a temperature of 120-180 DEG C via a hydrothermal method, cooling, drying, and respectively calcining at a temperature of 200-1000 DEG C to obtain the rare earth-doped calcium tungstate phosphor with different luminescence properties. The invention successfully realizes the effective regulation and control to the luminescence color of the calcium tungstate phosphor, obtains the rare earth-doped calcium tungstate phosphor with uniform grain diameter, favorable dispersibility excellent physicochemical property, and wide application prospect in the fields of biomaterial, luminescent paint and fluorescent lamps and the like. The invention has the advantages of simple preparation process, low cost and little equipment investment, and is suitable for mass production.

Description

technical field [0001] The invention relates to a preparation method of calcium tungstate fluorescent powder, in particular to a preparation method of rare earth-doped calcium tungstate fluorescent powder. Background technique [0002] Phosphor powder has important application value in many sectors of the national economy, the most widely used is in fluorescent lamps, followed by color and black and white TV. In addition, phosphors can also be used in oscilloscopes and radar screens, as well as electron-photon converters, nuclear radiation displays, and X-ray intensifying screens. In short, phosphors are widely used, and their scope of use is also expanding year by year. Therefore, it is of great practical significance to develop and improve phosphors. The history of fluorescent lighting begins in 1938. In the early 1940s, manganese and antimony activated calcium halophosphate phosphors were invented. Because the emission spectrum excited by the activator manganese and a...

Claims

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Application Information

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IPC IPC(8): C09K11/78
Inventor 卢越李星许兰平王冬杰
Owner NINGBO UNIV
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