Titanate luminescent material and preparation method thereof

A technology of luminescent materials and titanates, which is applied in the direction of luminescent materials, alkaline earth metal titanates, titanates, etc., can solve the problems of increased non-radiative transition probability, ion vacancies and oxygen vacancies, and reduced ion luminescence efficiency, etc., to achieve The effect of improving internal quantum efficiency, good luminous performance, and reducing the probability of non-radiative transition

Active Publication Date: 2016-08-24
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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Problems solved by technology

[0003] However, traditional titanate materials generally have structural defects, such as CaTiO 3 : The luminescent center Pr in the Pr material 3+ Ion substitution of A-site Ca in the perovskite structure 2+ ions, easy to cause Ca 2+ Defects such as ion vacancies and oxygen vacancies increase the probability of non-radiative transitions and reduce the Pr 3+ ion luminescence efficiency, resulting in CaTiO 3 : Pr material has the problem of low luminous efficiency, which limits the performance of CaTiO 3 : Practical application of Pr material

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  • Titanate luminescent material and preparation method thereof
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preparation example Construction

[0029] In addition, this embodiment also provides a method for preparing a titanate luminescent material, such as figure 1 shown, including the following steps:

[0030] Step S110, mixing and reacting the salt solution of the metal M, the organic titanium compound and the first reducing agent to prepare TiO containing a core-shell structure 2 @M z The colloid, and then the colloid is centrifuged, and the solid phase obtained after the centrifugation is washed, and dried to obtain TiO 2 @M z solid. Wherein, the salt solution of the metal M is mixed with the organotitanium compound according to the molar amount that the molar ratio of M to titanium is z, 0-2 , M is at least one of Ag, Au, Pt, Pd and Cu, @ is cladding, M constitutes the core of the core-shell structure, TiO 2 The cladding M constitutes the shell layer of the core-shell structure.

[0031] In this embodiment, the salt solution of metal M has a concentration of 5×10 -5 mol / L-5×10 -3 mol / L containing HAuCl 4...

Embodiment 1

[0041] Preparation of Ca by sol-gel method 0.999 Ti 0.98 o 3 :Pr 0.001 ,Al 0.02 @TiO 2 @ :

[0042] TiO 2 @ Preparation: Weigh 10.3mg of chloroauric acid (AuCl 3 ·HCl·4H 2 O) Dissolve in deionized water to prepare 20mL 5×10 -3 mol / L chloroauric acid solution; pipette 5mL 4.3mol / L triethanolamine titanium isopropoxide, dilute to 1mol / L with isopropanol; pipette 10mL 5×10 -3 mol / L chloroauric acid solution and 5mL 1mol / L isopropanol solution of triethanolamine titanium isopropoxide, stir evenly; then add 15mL dimethylformamide to the mixed solution, stir at room temperature for 15 minutes, then use The condensing reflux device is heated and stirred at 140 ° C, the reaction liquid is colorless to light brown, and then to dark brown, stop heating, cool to room temperature, and obtain TiO 2 @ colloid; then centrifuged TiO 2 @ The solid phase was collected by the colloid, and the collected solid phase was washed with ethanol, and dried to obtain TiO 2 @ solid. ...

Embodiment 2

[0045] Preparation of Ca by sol-gel method 0.998 Ti 0.9 o 3 :Pr 0.002 ,Al 0.1 @TiO 2 @

[0046] TiO 2 @ Preparation: weigh 3.4mg of silver nitrate (AgNO 3 ) was dissolved in deionized water to prepare 20 mL of 1×10 -3 mol / L silver nitrate solution; pipette 10m L of 4.3mol / L triethanolamine titanium isopropoxide, dilute to 0.22mol / L with isopropanol; pipette 2mL 1×10 -3 mol / L silver nitrate solution and 18mL1mol / L isopropanol solution of triethanolamine titanium isopropoxide, stir evenly; then add 10mL dimethylformamide to the mixed solution, stir at room temperature for 15 minutes, then use condensing reflux The device is heated and stirred at 140°C, and the reaction liquid changes from colorless to light brown, and then to dark brown, stop heating, cool to room temperature, and obtain TiO 2 @ colloid; then centrifuged TiO 2 @ The solid phase was collected by the colloid, and the collected solid phase was washed with ethanol, and dried to obtain TiO 2 @ so...

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Abstract

The invention relates to a titanate luminescent material and a preparation method thereof. The titanate luminescent material has the following general chemical formula: Ca1-xTi1-yO3:Prx,Ry@TiO2@Mz, wherein @ is coating, Mz is the core, TiO2 is the middle shell, Ca1‑xTi1‑yO3:Prx, Ry is the outer shell, Prx and Ry are doped in Ca1‑xTi1‑yO3; R is at least one of Al and Ga, M is Ag, Au , at least one of Pt, Pd and Cu metal nanoparticles; 0

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a titanate luminescent material and a preparation method thereof. Background technique [0002] Red phosphors include several categories of materials such as sulfides, oxides, sulfur oxides and titanates. Among them, titanate materials have the advantages of high stability and good color rendering performance, and can be used in occasions that require high stability of phosphor powder, such as field emission display screens used under low voltage and high current density. . Typical representative material of titanates CaTiO 3 : The CIE chromaticity coordinates of Pr are x=0.680 and y=0.311, which is very close to the ideal red light, and is an ideal phosphor. [0003] However, traditional titanate materials generally have structural defects, such as CaTiO 3 : The luminescent center Pr in the Pr material 3+ Ion substitution of A-site Ca in the perovskite structu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/87
CPCC09K11/7706C01G23/006C01G23/053C01P2002/52C01P2004/80C09K11/58C09K11/87C09K11/02C09K11/77
Inventor 周明杰王荣
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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