A kind of self-reduction to prepare blue light phosphor SR 2 b 5 o 9 cl:eu 2+ Methods

A fluorescent powder and blue light technology, which is applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of high temperature and complex operation of blue light phosphors, and achieve the effects of less types, high quantum yield, and low preparation temperature

Active Publication Date: 2022-03-04
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of self-reduction to prepare blue light phosphor SR <sub>2</sub> b <sub>5</sub> o <sub>9</sub> cl:eu <sup>2+</sup> Methods
  • A kind of self-reduction to prepare blue light phosphor SR <sub>2</sub> b <sub>5</sub> o <sub>9</sub> cl:eu <sup>2+</sup> Methods
  • A kind of self-reduction to prepare blue light phosphor SR <sub>2</sub> b <sub>5</sub> o <sub>9</sub> cl:eu <sup>2+</sup> Methods

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, the maximum emission peak is at 421nm (see Figure 2), and 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, the maximum emission peak is at 421nm (see Figure 4), and 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 fluorescent powder emits blue light, the maximum emission peak position is at 421nm (see Figure 6), and the quantum yield is 72%.

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Abstract

The invention discloses a method for preparing blue light fluorescent powder Sr by self-reduction 2 B 5 o 9 Cl:Eu 2+ method, the method will SrCl 2 ·6H 2 O, boron source and Eu 2 o 3 After grinding and mixing evenly, put it in a platinum crucible, seal it in a stainless steel flanged reaction kettle (use temperature less than 500°C, use pressure less than 49bar), put the reaction kettle in a muffle furnace, and react at 300-450°C. i.e. get Sr 2 B 5 o 9 Cl:Eu 2+ Phosphor powder, wherein the boron source is H 3 BO 3 or H 3 BO 3 and K 2 B 4 o 7 4H 2 O or Na 2 B 4 o 7 10H 2 O mixture. The method of the invention is simple, there are few types of reaction raw materials, no need to carry out under reducing atmosphere, the reaction efficiency is high, and the prepared Sr 2 B 5 o 9 Cl:Eu 2+ Phosphor powder has high purity, high quantum yield, and narrow emission spectrum. It 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 Patents(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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