Method for preparing blue-light fluorescent powder Sr2B5O9Cl:Eu<2+> by means of self-reduction

A fluorescent powder and blue light technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of complex operation and high temperature of blue light fluorescent powder, and achieve the effect of fewer types, simple methods, and low preparation temperature

Active Publication Date: 2019-12-27
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above preparation methods using the self-reduction method to prepare Eu ion-doped blue phosphors are complicated to operate, the temperature is high, and neither Eu ion 3+ All reverted to Eu 2+

Method used

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  • Method for preparing blue-light fluorescent powder Sr2B5O9Cl:Eu&lt;2+&gt; by means of self-reduction
  • Method for preparing blue-light fluorescent powder Sr2B5O9Cl:Eu&lt;2+&gt; by means of self-reduction
  • Method for preparing blue-light fluorescent powder Sr2B5O9Cl:Eu&lt;2+&gt; by means of self-reduction

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 2.66g (10mmol) SrCl 2 ·6H 2 O, 1.54g (25mmol) H 3 BO 3 and 0.108g (0.6mmol) Eu 2 o 3 Grind for 20 minutes to make the three fully mixed evenly, then place in a platinum crucible, seal the platinum crucible in a stainless steel flanged reactor (use temperature less than 500°C, use pressure less than 49bar), and place the reactor in a muffle furnace In the process, the heating rate was raised to 350°C at a rate of 5°C / min, the constant temperature was reacted for 12 hours, and naturally cooled to obtain the target product Sr 2 B 5 o 9 Cl:Eu 2+ (See figure 1 ). This phosphor emits blue light, and the maximum emission peak is at 421nm (see figure 2 ), the quantum yield is 77%.

Embodiment 2

[0030] 2.66g (10mmol) SrCl 2 ·6H 2 O, 1.54g (25mmol) H 3 BO 3 and 0.144g (0.8mmol) Eu 2 o 3 Grind for 20 minutes to make the three fully mixed evenly, then place in a platinum crucible, seal the platinum crucible in a stainless steel flanged reactor (use temperature less than 500°C, use pressure less than 49bar), and place the reactor in a muffle furnace In the process, the heating rate was raised to 350°C at a rate of 5°C / min, the constant temperature was reacted for 12 hours, and naturally cooled to obtain the target product Sr 2 B 5 o 9 Cl:Eu 2+ (See image 3 ). This phosphor emits blue light, and the maximum emission peak is at 421nm (see Figure 4 ), the quantum yield is 84%.

Embodiment 3

[0032] 2.66g (10mmol) SrCl 2 ·6H 2 O, 1.54g (25mmol) H 3 BO 3 and 0.072g (0.4mmol) Eu 2 o 3 Grind for 20 minutes to make the three fully mixed evenly, then place in a platinum crucible, seal the platinum crucible in a stainless steel flanged reactor (use temperature less than 500°C, use pressure less than 49bar), and place the reactor in a muffle furnace In the process, the heating rate was raised to 350°C at a rate of 5°C / min, the constant temperature was reacted for 12 hours, and naturally cooled to obtain the target product Sr 2 B 5 o 9 Cl:Eu 2+ (See Figure 5 ). This phosphor emits blue light, and the maximum emission peak is at 421nm (see Figure 6 ), the quantum yield is 72%.

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Abstract

The invention discloses a method for preparing blue-light fluorescent powder Sr2B5O9Cl:Eu<2+> by means of self-reduction. The method comprises the following steps: grinding and uniformly mixing SrCl2.6H2O, a boron source and Eu2O3, and adding the mixture into a platinum crucible; sealing the platinum crucible in a stainless steel flange type reaction kettle (the working temperature is less than 500 DEG C and the working pressure is less than 49 bar); placing the reaction kettle in a muffle furnace, carrying out a reaction at a temperature of 300-450 DEG C to obtain the Sr2B5O9Cl:Eu<2+> fluorescent powder, wherein the boron source is H3BO3 or a mixture of H3BO3 and K2B4O7.4H2O or Na2B4O7.10H2O. The method disclosed by the invention is simple, few in reaction raw material variety, free of being carried out in a reducing atmosphere and high in reaction efficiency; the Sr2B5O9Cl:Eu<2+> fluorescent powder is high in purity, high in quantum yield and narrow in emission spectrum, is a potential blue light emitting material and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of fluorescent material synthesis, and in particular relates to a simple preparation method of blue fluorescent powder with high quantum yield and narrow emission spectrum. Background technique [0002] Borates are rich in structure and have a wide range of uses. They are mainly used in various functional materials such as flame retardant materials, nonlinear optical materials, fluorescent materials, photocatalytic materials, and lithium battery materials. According to reports, borates with a three-dimensional network structure composed of BO4 tetrahedral groups are a class of phosphor matrix materials with self-reducing ability. Such as: Sr 2 B 5 o 9 Cl, as a kind of borate, is the first phosphor matrix material found to have self-reducing ability. Eu 2+ Doped Sr 2 B 5 o 9 Cl in air atmosphere and N 2 It can be synthesized by calcination under atmosphere, which needs to be calcined at 400°C for 5h ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/63
CPCC09K11/774
Inventor 梁攀刘志宏连文丽
Owner SHAANXI NORMAL UNIV
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