Eu<3+> doped fluorine niobium tantalite fluorescent powder as well as synthesis and application thereof

A technology of niobium tantalate and phosphor, applied in the field of fluorine niobium tantalate phosphor and its synthesis and application, can solve the problem of low excitation efficiency, and achieve strong excitation efficiency, enhanced cleanliness, and excellent thermal stability. Effect

Active Publication Date: 2019-08-02
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Among the currently developed commercial red-emitting phosphors, trivalent europium Eu 3+ Ion-excited red-emitting phosphors are the most important category, mainly Y 2 o 3 :Eu 3+ , Y 2 o 2 S:Eu 3+ , but the excitation efficiency of these phosphors in the near-ultraviolet wavelength region is low

Method used

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  • Eu&lt;3+&gt; doped fluorine niobium tantalite fluorescent powder as well as synthesis and application thereof
  • Eu&lt;3+&gt; doped fluorine niobium tantalite fluorescent powder as well as synthesis and application thereof
  • Eu&lt;3+&gt; doped fluorine niobium tantalite fluorescent powder as well as synthesis and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Ca 2.8 Eu 0.2 Nb 2 Ta 1.8 Ti 0.2 o 12 f 2

[0031] According to the chemical formula Ca 1.8 Eu 0.2 Nb 2 Ta 1.8 Ti 0.2 o 12 The stoichiometric ratio of each element is weighed: CaCO 3 : 3.6 g; Eu 2 o 3 : 0.704 g; Nb 2 o 5 : 5.316 grams; Ta 2 o 5 : 7.956 g; TiO 2: 0.32 g; put the weighed raw materials into an agate mortar and grind them carefully to obtain a mixture of these raw materials that is pre-calcined in an air atmosphere at a calcination temperature of 850° C. and a calcination time of 10 hours; put the pre-calcined raw materials obtained again Grind in an agate mortar, press the obtained mixture into a block, and calcinate it twice in an air atmosphere at a temperature of 1400°C for 1 hour, cool naturally, put it into an agate mortar and grind it into a powder, and obtain a pre-calcined mixture.

[0032] According to Ca 1.8 Eu 0.2 Nb 2 Ta 1.8 Ti 0.2 o 12 ·CaF 2 Medium CaF 2 Weigh the molar ratio of CaF 2 : 1.56 g and NH ...

Embodiment 2

[0037] Example 2: Ca 2.994 Eu 0.006 Nb 2 Ta 1.994 Ti 0.006 o 12 f 2

[0038] According to the chemical formula Ca 1.994 Eu 0.006 Nb 2 Ta 1.994 Ti 0.006 o 12 The stoichiometric ratio of each element is weighed: Ca(NO 3 ) 2 : 19.62 g; Eu 2 o 3 : 0.0634 g; Nb 2 o 5 : 15.948 grams; Ta 2 o 5 : 26.44 g; TiO 2 : 0.029 g; put the weighed raw materials into an agate mortar and grind them carefully to obtain a mixture of these raw materials that is pre-calcined in an air atmosphere at a calcination temperature of 1200° C. and a calcination time of 1 hour; put the obtained pre-calcined raw materials Grinding in an agate mortar, the obtained mixture is pressed into a block, and calcined for the second time in an air atmosphere. The calcination temperature is 1200 ° C, and the calcination time is 10 hours. After natural cooling, it is put into an agate mortar and ground into a powder to obtain a pre-calcined mixture.

[0039] According to Ca 1.994 Eu 0.006 Nb 2 Ta ...

Embodiment 3

[0041] Example 3: Ca 2.7 Eu 0.3 Nb 2 Ta 1.7 Ti 0.3 o 12 f 2

[0042] According to the chemical formula Ca 1.7 Eu 0.3 Nb 2 Ta 1.7 Ti 0.3 o 12 The stoichiometric ratio of each element is weighed: CaCO 3 : 5.95 g; Eu 2 o 3 : 1.848 g; Nb 2 o 5 : 9.303 grams; Ta 2 o 5 : 13.15 g; TiO 2 : 0.84 g; put the weighed raw materials into an agate mortar and grind carefully to obtain a mixture of these raw materials that is pre-calcined in an air atmosphere at a calcination temperature of 900° C. and a calcination time of 3 hours; Grinding in an agate mortar, pressing the obtained mixture into blocks, and calcining for the second time in an air atmosphere, the calcining temperature is 1300°C, and the calcining time is 4 hours. The product obtained in the above steps is naturally cooled to obtain a pre-calcined product.

[0043] According to Ca 1.7 Eu 0.3 Nb 2 Ta 1.7 Ti 0.3 o 12 ·CaF 2 Medium CaF 2 Weigh the molar ratio of CaF 2 : 2.73 g and NH 4 F: 1.295 grams; ...

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Abstract

The invention discloses Eu<3+> doped fluorine niobium tantalite fluorescent powder as well as synthesis and an application thereof. The fluorescent powder has a chemical formula of Ca(3-2x)Eu2xNb2Ta(2-2x)Ti2xO12F2, wherein x denotes the mole number of Eu<3+> ions and Ti<4+> ions substituting Ca<2+> ions and Ta<5+>, and x is larger than or equal to 0.003 and smaller than or equal to 0.15. Firstly,a precursor Ca(2-2x)Eu2xNb2Ta(2-2x)Ti2xO12 (x is larger than or equal to 0.003 and smaller than or equal to 0.15) free of calcium fluoride is prepared with a solid phase synthesis method; calcium fluoride and ammonium fluoride are added to a precursor, mixed sufficiently and pressed into a block, synthesis and calcination are performed by use of a solid phase, and the Eu<3+> doped fluorine niobiumtantalite fluorescent powder is prepared. The provided fluorescent powder can well absorb ultraviolet light and emit red light with very pure chromaticity. The fluorescent powder can be well matchedwith a near ultraviolet semiconductor LED chip and is potential red luminescent powder for preparation of white light LED illumination devices.

Description

technical field [0001] The invention relates to the field of inorganic fluorescent materials, in particular to a Eu 3+ Doped fluoroniobium tantalate phosphor and its synthesis and application. Background technique [0002] Luminescence generally means that an object is excited by energy, and electrons absorb energy to transition from the ground state to the excited state, and then release energy in the process of returning to the ground state, and radiate in the form of light to realize the luminescence of the material. For example, rare earth phosphors are the most important luminescent materials. Compared with corresponding non-rare earth phosphors, rare earth phosphors have better luminous efficiency and light color performance. Therefore, the use of rare earth fluorescent materials has become more and more extensive in recent years, and the annual consumption has increased rapidly. [0003] In rare earth phosphors, rare earth ions are the most important luminescent act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/67H01L33/50
CPCC09K11/7733H01L33/502
Inventor 乔学斌王胜家赵君亚
Owner XUZHOU NORMAL UNIVERSITY
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