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Niobate luminescent material and preparation method thereof

A luminescent material and niobate technology, applied in the field of niobate luminescent materials, can solve the problems of reducing the luminous efficiency of phosphors, shortening the service life, low luminous efficiency, etc., and achieving easy control of process conditions, energy saving, and low preparation temperature. Effect

Inactive Publication Date: 2010-12-01
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For sulfide phosphors, the luminous brightness is high and has certain conductivity, but the stability is poor, and it is easy to decompose and produce under the bombardment of low-voltage and high-current electron beams. The sulfur produced by the decomposition has a "poison" effect on the cathode emitter. The generated precipitate covers the surface of the phosphor powder, which reduces the luminous efficiency of the phosphor powder and shortens the service life of the FED
Oxide phosphors have good stability, but the luminous efficiency is relatively low, and the performance of both needs to be improved and improved

Method used

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  • Niobate luminescent material and preparation method thereof
  • Niobate luminescent material and preparation method thereof

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preparation example Construction

[0016] The present invention also provides a preparation method of niobate luminescent material, characterized in that the preparation method comprises the following steps:

[0017] S1, using Ln-containing compounds, europium-containing (Eu)-containing compounds, scandium-containing (Sc)-containing compounds, and niobium-containing (Nb)-containing compounds as raw materials, according to the general chemical formula Ln 2-x Eu x CaNbO 7 The stoichiometric ratio of each element in , weigh each raw material, grind and mix evenly to form a mixture; wherein, Ln is one or more of Gd, Y, La, Lu; the value range of x is 0<x≤1.5 ;

[0018] S2. Pre-burn the mixture at 300-500°C for 3-5 hours, cool and grind;

[0019] S3. Calcining the ground product after pre-calcination at 1300-1600° C. for 1-12 hours, cooling to room temperature, and grinding to obtain a niobate luminescent material.

[0020] In the preparation method of the niobate luminescent material described in the present in...

Embodiment 1

[0022] Embodiment 1, prepare Gd 1.98 Eu 0.02 CaNbO 7 Luminescent material

[0023] According to the stoichiometric ratio, weigh gadolinium oxide Gd 2 o 3 0.8971g, europium oxide Eu 2 o 3 0.0088g, scandium oxide Sc 2 o 3 0.1724g, niobium oxide Nb 2 o 5 0.3325g, 5% (mole percent, the same below) boric acid H 3 BO 3 0.0077g.

[0024] Place the above-mentioned weighed raw materials in an agate mortar and thoroughly grind them, put them into a corundum crucible and pre-sinter at 400°C for 4 hours, then cool to room temperature, grind them again and calcinate at 1300°C for 10 hours, cool to room temperature, and grind , that is, Gd 1.98 Eu 0.2 CaNbO 7 Niobate red luminescent material.

Embodiment 2

[0025] Embodiment 2 prepares Gd 1.9 Eu 0.1 CaNbO 7 Luminescent material

[0026] According to the stoichiometric ratio, weigh gadolinium oxide Gd 2 o 3 0.8609g, europium oxide Eu 2 o 3 0.0440g, scandium oxide Sc 2 o 3 0.1724g, niobium oxide Nb 2 o 5 0.3325g, 5% boric acid H 3 BO 3 0.0077g.

[0027] Place the above weighed raw materials in an agate mortar and thoroughly grind them, put them into a corundum crucible and pre-sinter at 500°C for 3 hours, then cool to room temperature, grind them again and calcinate at 1400°C for 5 hours, cool to room temperature, and grind , that is, Gd 1.9 Eu 0.1 CaNbO 7 Niobate red luminescent material.

[0028] The niobate material Gd 1.9 Eu 0.1 CaNbO 7 The CL emission spectrum under cathode ray excitation with an accelerating voltage of 3kv is shown in figure 1 . Depend on figure 1 know, in Gd 2 CaNbO 7 Eu ions are doped in the middle, Eu is in the anti-symmetric central lattice, and emits red light near 610nm. Such ma...

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Abstract

The invention belongs to the field of luminescent materials of rare-earth elements and discloses a niobate luminescent material. The chemical general formula of the niobate luminescent material is Ln2-xEuxScNbO7, wherein Ln is selected from one or more of Gd, Y, La and Lu; and x is more than 0 and less than or equal to 1.5. The invention also discloses a preparation method of the niobate luminescent material. Compared with the material prepared by the prior art, the niobate luminescent material prepared by the method has high stability. The preparation method of the niobate luminescent material has the advantages of simple operation, no pollution, easily-controlled process condition, low preparation temperature, energy conservation, contribution to industrialized production and the like.

Description

technical field [0001] The invention relates to a niobate luminescent material, in particular to a low-voltage field emission oxide niobate luminescent material which can be used for field emission. The invention also relates to a preparation method of niobate luminescent material. Background technique [0002] A field emission display is a new type of flat panel display, and its working principle is similar to that of a CRT. One of the key factors to prepare a flat panel display (FED, the same below) with good performance is the preparation of phosphor. At present, most of the phosphors used in FED are based on the traditional phosphors used in CRT and improved. The phosphors used are mainly sulfides and oxides. For sulfide phosphors, the luminous brightness is high and has certain conductivity, but the stability is poor, and it is easy to decompose and produce under the bombardment of low-voltage and high-current electron beams. The sulfur produced by the decomposition ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78
Inventor 周明杰梁小芳马文波
Owner OCEANS KING LIGHTING SCI&TECH CO LTD