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Lanthanum titanate red fluorescent material taking Sm<3+> as luminescence center, and preparation method thereof

A technology of red fluorescence and lanthanum titanate, applied in luminescent materials, chemical instruments and methods, etc., can solve problems such as poor color purity, low conversion efficiency, and poor color rendering of mixed light

Inactive Publication Date: 2015-07-01
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, due to the low conversion efficiency, low brightness, poor color purity and other defects of red phosphor powder, the problems of poor mixed light color rendering and low quantum efficiency have not been well solved for a long time.

Method used

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  • Lanthanum titanate red fluorescent material taking Sm&lt;3+&gt; as luminescence center, and preparation method thereof
  • Lanthanum titanate red fluorescent material taking Sm&lt;3+&gt; as luminescence center, and preparation method thereof
  • Lanthanum titanate red fluorescent material taking Sm&lt;3+&gt; as luminescence center, and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] a Sm 3+ The preparation method of the lanthanum titanate red fluorescent material which is the luminescence center comprises the following steps: weighing 1.98mmol lanthanum acetate (La(CH 3 COO) 3 , A.R.), 0.02mmol samarium acetate (Sm(CH 3 COO) 3 , A.R.) was dissolved in an appropriate amount of distilled water, and 1 mmol of tetrabutyl titanate (C 16 h 36 o 4 Ti, A.R.), dissolved in 30ml methanol, dropwise added 10mmol nitric acid (HNO 3 , A.R.), magnetically stirred for 1 h, put into an oil bath at 80° C. for about 8 h, and a colloidal precipitate, the precursor sol C, was obtained.

[0035] The precursor sol C was taken out and placed in a corundum crucible, and calcined in a muffle furnace at 1100° C. for 4 hours to obtain the required lanthanum titanate red phosphor.

Embodiment 2

[0037] a Sm 3+ The preparation method of the lanthanum titanate red fluorescent material which is the luminescence center comprises the following steps: weighing 1.94mmol lanthanum acetate (La(CH 3 COO) 3 , A.R.), 0.06mmol samarium acetate (Sm(CH 3 COO) 3 , A.R.) was dissolved in an appropriate amount of distilled water, and 1 mmol of tetrabutyl titanate (C 16 h36 o 4 Ti, A.R.), dissolved in 50ml ethanol, dropwise added 10mmol nitric acid (HNO 3 , A.R.), stirred mechanically for 1.5 h, put it in a water bath at 60° C. for about 10 h, and obtained a colloidal precipitate, the precursor sol C. The precursor sol C was taken out and placed in a corundum crucible, and calcined in a muffle furnace at 1100° C. for 4 hours to obtain the desired phosphor.

Embodiment 3

[0039] A Sm 3+ The preparation method of the lanthanum titanate red fluorescent material as the luminescent center: comprises the following steps: weigh 1.9mmol lanthanum nitrate (La(CH 3 COO) 3 , A.R.), 0.1mmol samarium nitrate (Sm(CH 3 COO) 3 , A.R.) was dissolved in an appropriate amount of distilled water, and 1 mmol of tetrabutyl titanate (C 16 h 36 o 4 Ti, A.R.), dissolved in 50ml butanol, dropwise added 10mmol nitric acid (HNO 3 , A.R.), magnetically stirred for 1.5 h, put into a water bath at 60°C for about 10 h, and a colloidal precipitate, the precursor sol C, was obtained. The precursor sol C was taken out and placed in a corundum crucible, and calcined in a muffle furnace at 1200° C. for 3 hours to obtain the desired phosphor.

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Abstract

The invention provides a lanthanum titanate red fluorescent material taking Sm<3+> as luminescence center, and a preparation method thereof, relating to the technical field of a luminescence material. The chemical constitution of the lanthanum titanate red fluorescent material is SmxLa2-xTiO5, and the preparation method comprises the following steps: firstly preparing lanthanum titanate gel, doping Sm<3+> ions, then sintering the gel at high temperature and preparing corresponding powder; and according to the luminescence intensity of the fluorescent powder, finally determining the optimal doping amount of the samarium at 3%. According to the lanthanum titanate red fluorescent material, the technology is simple, safe and easy to control, the prepared powder is different from the structures of perovskite and spinel luminescent matrix, and is a novel photoluminescent material matrix, and can provide new expand space for the rare earth photoluminescent material.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a Sm 3+ Lanthanum titanate red fluorescent material as luminescent center and its preparation method and application. Background technique [0002] There are many kinds of rare earth titanate salts. Due to their excellent dielectric, piezoelectric and ferroelectric properties, they are widely used as new electronic ceramic materials in filters and capacitors. Among them, lanthanum titanate with a pyrochlore structure has good electrical, optical and catalytic properties, and can be used to adjust the dielectric constant of magnesium titanate ceramics, and has been widely used as a high-frequency capacitor material for high-temperature use, and can also be used for Make microwave dielectric resonator oscillators, microwave integrated circuit substrates, etc. [0003] In rare earth titanates with pyrochlore structure, Ti 4+ Ions and O 2- The ions are five-coordina...

Claims

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Application Information

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IPC IPC(8): C09K11/78
Inventor 郭瑞王燕燕王仁超何龙齐建全
Owner NORTHEASTERN UNIV
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