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A method for solvothermally assisted preparation of multi-phase titanate red long-lasting phosphor

A long-lasting phosphor and multi-phase titanate technology, applied in chemical instruments and methods, luminescent materials, climate sustainability, etc., can solve problems such as difficult ionization, achieve simple process, low pollution, and avoid easy loss of activity Effect

Active Publication Date: 2021-01-08
HUNAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the problem that the ions easily affected by the pH value are difficult to dope in the hydrothermal method, and provides a simple, mild reaction condition, less environmental pollution and easy to dope Bi 3+ 、B 3+ Plasma Synthesis of Calcium Titanate Doped with Pr 3+ A method for red long-lasting phosphors, and by this method CaTiO with a fixed ratio composition 3 · m Zn 2 TiO 4 :Pr 3+ Multi-phase red long afterglow phosphor

Method used

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  • A method for solvothermally assisted preparation of multi-phase titanate red long-lasting phosphor
  • A method for solvothermally assisted preparation of multi-phase titanate red long-lasting phosphor
  • A method for solvothermally assisted preparation of multi-phase titanate red long-lasting phosphor

Examples

Experimental program
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Effect test

example 1

[0020] Example 1 [Ca 0.8 Zn 0.2 TiO 3 ]

[0021] Weigh 2.5527g (about 5mL) of butyl titanate, dissolve it in 75 mL of n-butanol, stir for 30 min under a magnetic stirrer at 300 r / min, add 2 mL of 3mol / L calcium nitrate, 0.5 mL of 3mol / L calcium nitrate dropwise / L zinc nitrate solution, stirred for 1 h, transferred to a high-pressure reactor to maintain a filling degree of 80%, sealed and reacted at 200 °C for 2 h, and after the reactor was cooled to room temperature, the mixed suspension of the precursor was mixed at 130 After drying at ℃, the precursor powder was ground and dried and calcined at 1100 ℃ for 5 h. get [Ca 0.8 Zn 0.2 TiO 3 ]’s multiphase titanate, its phase composition is as follows figure 1 As shown, the microscopic morphology is as figure 2 shown.

example 2

[0022] Example 2 [Ca 0.8 Zn 0.2 TiO 3 ]: Pr 3+

[0023] The preparation method is the same as Example 1, except that butyl titanate is dissolved in 25 mL of isopropanol, and 0.75 mL of 0.0005 mol / L praseodymium nitrate solution is added to obtain [Ca 0.8 Zn 0.2 TiO 3 ]: Pr 3+ The complex phase titanate red phosphor, its excitation and emission spectra are as follows image 3 shown.

example 3

[0024] Example 3 [Ca 0.8 Zn 0.2 TiO 3 ]: Pr 3+

[0025] The preparation method is the same as that of Example 1, except that butyl titanate is dissolved in 25 mL of ethylene glycol, and 0.75 mL of 0.0005 mol / L praseodymium nitrate solution is added. get [Ca 0.8 Zn 0.2 TiO 3 ]: Pr 3+ The complex phase titanate red phosphor, its excitation and emission spectra are as follows Figure 4 shown.

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Abstract

The invention discloses a method for using a solvent thermal method to assist in synthesizing multiphase titanate red long afterglow fluorescent powder. High-concentration Ca2+, Zn2+, Pr3+, Bi3+ and B3+ metal ion solutions are introduced into alcoholic solutions of ethyl alcohol, ethanediol, glycerol, isopropanol or normal butanol containing butyl titanate. The multiphase red long afterglow fluorescent powder is synthesized according to the stoichiometric ratio of [Ca0.8Zn0.2TiO3]: Pr, aBi3+, bB3+(0<=a<=0.01, 0<=b<=0.01) and [CaTiO3.mZn2TiO4]: Pr3+ (0(m(0.5)). A solvent thermal method is adopted for preparing a precursor, and the precursor is roasted in a high-temperature furnace at 900-1,150 DEG C for 3-5 h. The method is simple in process and small in pollution, and Bi3+, B3+ and other zwitter ions much influenced by pH can be effectively doped. The red long afterglow fluorescent powder which has the grain size at the micron order, uniform microstructures, broadband excitation at 300-400 nm and narrowband emission at 600-630 nm is obtained. The obtained powder does not need to be further ground and can be directly applied to white LEDs based on ultraviolet chips, farm-oriented facilities, solar cells and the like.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and relates to solvothermally assisted synthesis of Ca 0.8 Zn 0.2 TiO 3 and CaTiO 3 · Zn 2 TiO 4 A red long-lasting phosphor as a matrix and a preparation method thereof. Background technique [0002] When red, green, and blue long-lasting phosphors have the same luminous properties, any color can be theoretically obtained by mixing them in a certain proportion. Among them, green and blue long-lasting phosphors have entered the practical stage, but there is still no red long-lasting phosphor that can match it. [0003] CaTiO 3 : Pr 3+ As a potential red long afterglow material, its color coordinate value ( x = 0.680, y =0.331) and the color coordinate value of the red luminescence stipulated by the National Television Standards Committee of the United States ( x = 0.667, y =0.333) is very close, but the biggest problem in this system is that the luminous intensity and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/67
CPCC09K11/7703Y02B20/00
Inventor 余丽萍谷智强邱忠贤廉世勋
Owner HUNAN NORMAL UNIVERSITY
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