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Na0.5Bi0.5TiO3-based red-light fluorescent material and preparation method thereof

A technology of red light fluorescence and preparation steps, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of increasing research and development time and cost, and achieve the effect of cost saving

Inactive Publication Date: 2014-01-08
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, after the matrix is ​​selected, the type and amount of compensation elements must be selected, which will undoubtedly increase the research and development time and cost.

Method used

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  • Na0.5Bi0.5TiO3-based red-light fluorescent material and preparation method thereof
  • Na0.5Bi0.5TiO3-based red-light fluorescent material and preparation method thereof
  • Na0.5Bi0.5TiO3-based red-light fluorescent material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 Preparation of Na 0.5 Bi 0.498 Pr 0.002 TiO 3 powder

[0024] Weigh respectively 2.4254 grams of bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O), 0.0076 grams of praseodymium nitrate pentahydrate (Pr(NO 3 ) 3 ·5H 2 O), 0.4102 grams of anhydrous sodium acetate (CH 3 COONa) was dissolved in a mixture of 20 mL of glacial acetic acid and 10 mL of ethylene glycol methyl ether, stirred and heated to 70 °C to obtain a mixture of Bi, Pr, and Na, and cooled naturally to room temperature. Then 7.2083g of acetylacetone and 3.0942g of butyl titanate were mixed, and then added to the mixture of Bi, Pr, and Na that had been cooled to room temperature, and stirred for more than 2 hours to obtain a stable and clear sol. Next, dry the sol obtained above, put it in a crucible, put it into a heating furnace, and sinter at a predetermined temperature of about 600° C. to 950° C. and a predetermined time of about 30 minutes to 1 hour. Here, sinter...

Embodiment 2

[0027] Example 2 Preparation of Na 0.5 Bi 0.498 Pr 0.002 TiO 3 film

[0028] In order to prepare red light-emitting thin films, the sol obtained in Example 1 was washed in Pt (Ⅲ) / TiO 2 / SiO 2 / Si (100) substrate is spin-coated, and rapid heat treatment is performed at 700 °C after each layer is spin-off. This was repeated 10 times to obtain a film of desired thickness.

[0029] The dominant wavelength emitted by the excited red fluorescent film of this embodiment is about 611 nm. Figure 4 is Na 0.5 Bi 0.5-x PR x TiO 3 When the thin film is excited by ultraviolet rays with a wavelength of 348nm, the emission spectra measured at different praseodymium contents can be seen from the figure that the optimal doping concentration of Pr ions is x=0.002.

[0030] Figure 5 is the synthesized Na 0.5 Bi 0.498 PR 0.002 TiO 3 Excitation spectra of fluorescent films. Figure 5 It is mainly used to monitor the luminous intensity under excitation light...

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Abstract

The invention discloses a Na0.5Bi0.5TiO3-based red-light fluorescent material and a preparation method thereof. The chemical formula of the fluorescent material is Na0.5Bi0.5-xPrxTiO3, wherein x is larger than 0 and less than or equal to 0.01. The preparation method of the fluorescent material comprises the following steps: adding salts of three metal elements namely Bi, Na and Pr to a mixed liquid formed by glacial acetic acid and ethylene glycol monobutyl ether, heating and stirring for dissolution so as to obtain a mixed liquid of Bi, Pr and Na; mixing tetrabutyl titanate with diacetone, and then adding the obtained mixed solution to the former mixed liquid so as to obtain a Na0.5Bi0.5TiO3-based precursor solution; coating the Na0.5Bi0.5TiO3-based precursor solution on a substrate through a solution spinning process, and then carrying out rapid thermal treatment so as to obtain a thin film; or carrying out gelation and high temperature sintering on the precursor solution so as to obtain powder. The fluorescent material disclosed by the invention can be used for preparing photoelectrical or illuminant materials and can be used in different luminescent devices through collocating light source exciting assemblies; and by using the fluorescent material, a large amount of costs are saved in the industries such as photoelectricity or illumination and the like.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, in particular to Na 0.5 Bi 0.5 TiO 3 Red-based fluorescent material and preparation method thereof. Background technique [0002] With perovskite oxides such as SrTiO 3 , CaTiO 3 etc. as the matrix, a small amount of rare earth ions, especially trivalent praseodymium ions as activators, have been widely studied and applied. Since praseodymium (Pr) is trivalent, and Sr and Ca are divalent, when praseodymium replaces the A site, due to the different valence, there will be a problem of charge compensation, which will affect the luminous intensity of the material. In order to improve the luminous intensity of the material, people generally dope trivalent elements at the B site to solve the problem of charge compensation. In this way, after the matrix is ​​selected, the type and amount of compensation elements must be selected, which will undoubtedly increase the research and devel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78
Inventor 包定华周洪
Owner SUN YAT SEN UNIV