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A kind of red fluorescent powder with self-waterproof performance and preparation method thereof

A technology for red phosphor powder and performance, which is applied in the field of red phosphor powder and its preparation, can solve the problems of poor weather resistance, reduced luminescence performance, and performance attenuation of phosphor powder, and achieves the effects of hydrolysis by moisture, uniform particles, and stable water resistance.

Active Publication Date: 2022-05-17
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But phosphors include halides and alkaline earth elements (such as Cl - , F - 、Na + 、K + etc.) are easily affected by moisture, which reduces their luminous performance. Although some researchers have proposed coating protection on the surface of the phosphor powder or using a surface coating solution to avoid direct contact of the phosphor powder with water, thereby improving the water resistance of the phosphor powder , but this method makes the phosphor poor in weather resistance, and its performance decays quickly in high temperature or ultraviolet environment
Studies have also shown that through H 2 o 2 or H 2 C 2 o 4 Such as passivation treatment to build an inactivation layer as an isolation film, which can not solve the fundamental problem. In some humid environments, lighting still requires the waterproof function of the phosphor itself.

Method used

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  • A kind of red fluorescent powder with self-waterproof performance and preparation method thereof
  • A kind of red fluorescent powder with self-waterproof performance and preparation method thereof
  • A kind of red fluorescent powder with self-waterproof performance and preparation method thereof

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Effect test

Embodiment 1

[0033] A kind of preparation method of the red fluorescent powder with self-waterproof performance, according to the following steps:

[0034] (1) Under normal temperature and pressure, take H2 with a mass percentage concentration of 50%. 2 TiF 6 and H 2 GeF 6 A mixed acid solution consisting of H 2 TiF 6 :H 2 GeF 6 The molar ratio is 1:9, slowly drop the mixed solution into 40% KNO 3 solution, KNO 3 The molar ratio of the application amount of the mixed acid solution is 1:2, and the circular regular stirring in the same direction is carried out while the dropwise addition is completed. After the dropwise addition is completed, the stirring is continued for 30 minutes, and the stirring speed is 80 rpm. 2 Ge 0.9 Ti 0.1 f 6 matrix solution;

[0035] (2) Suction filtration by circulating water type multi-purpose vacuum pump suction filter, washing with distilled water until neutral, and then drying in an oven at 90°C for 10h to obtain K 2 Ge 0.9 Ti 0.1 f 6 matrix;...

Embodiment 2

[0041] A kind of preparation method of the red fluorescent powder with self-waterproof performance, according to the following steps:

[0042] (1) Under normal temperature and pressure, take H2 with a mass percentage concentration of 30%. 2 TiF 6 and H 2 SiF 6 A mixed acid solution consisting of a molar ratio of H 2 TiF 6 :H 2 SiF 6 =1:1, slowly drop into the KCl solution with a mass percentage concentration of 10%, the molar ratio of the application amount of KCl to the mixed acid solution is 1:10, and carry out circular regular stirring in the same direction while adding dropwise, after the dropwise addition is completed Continue to stir for 40min and the stirring speed is at 60 revs / min to obtain K 2 Ti 0.5 Si 0.5 f 6 matrix solution;

[0043] (2) Suction filtration with circulating water multi-purpose vacuum pump filter, wash with distilled water until neutral, and then dry in a vacuum oven at 90°C for 8 hours to obtain matrix K 2 Ti 0.5 Si 0.5 f 6 ;

[004...

Embodiment 3

[0049] A kind of preparation method of the red fluorescent powder with self-waterproof performance, according to the following steps:

[0050] (1) Under normal temperature and pressure, take H2 with a mass percentage concentration of 40%. 2 SiF 6 and H 2 GeF 6 A mixed solution consisting of a molar ratio of H 2 GeF 6 :H 2 SiF 6 =3:7, slowly drop into the KOH solution with a mass percentage concentration of 26%, the molar ratio of KOH to the mixed acid solution is 1:6, carry out circular regular stirring in the same direction while adding, and continue to Stir for 35min, and the stirring speed is 70 rev / min, and the obtained K 2 Si 0.7 Ge 0.3 f 6 matrix solution;

[0051] (2) Use a circulating water type multi-purpose vacuum pump filter to filter, wash with distilled water until neutral, and then dry in a vacuum oven at 90°C for 9 hours to obtain matrix K 2 Si 0.7 Ge 0.3 f 6 ;

[0052] (3) get the K prepared in step (2) 2 Si 0.7 Ge 0.3 f 6 powder and KMnO 4...

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Abstract

The general formula of a red fluorescent powder with its own waterproof performance is: K 2 M x N y F 6 : ZMN 4+ , Of which K 2 M x N y F 6 As its matrix, MN in the substrate is any combination of Si, GE, and TI ions, 0 <x <1, 0 <y <1, and x+y = 1, 0 <z ≦ 0.2.The red fluorescence powder with its own waterproof performance is K 2 M x N y F 6 As a matrix, and KMNO 4 Reaction system with HF solution.Use the method of the present invention to prepare fluorescent powder fast, simple, and efficient. The red fluorescent powder made by using the method of the present invention is launched as a narrow -band.The problem of fluorescent powder in the waterproof means of traditional coating protection is faster, and it does not need to use waterproof coating, saving production costs, and can be widely used in humid environments.

Description

technical field [0001] The invention relates to the technical field of light emission, in particular to a red fluorescent powder with waterproof performance and a preparation method thereof. Background technique [0002] The development of white light diodes (LEDs) is of great significance to saving global energy, because of their long life, high energy conversion efficiency, good stability, small size, light weight, and compact structure, they are widely used in display and lighting fields . At present, most commercial WLEDs are made by combining InGaN blue chip and YAG:Ce 3+ It is made of yellow phosphor. The blue light emitted by GaN excites YAG to obtain yellow light, and the unabsorbed blue light and yellow light combine to obtain white light. Therefore, YAG phosphor that emits yellow light under blue or purple light excitation is currently used. The largest class of phosphors, but due to the YAG:Ce 3+ Insufficient red components in the emission spectrum lead to low ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/67C09K11/66
CPCC09K11/676C09K11/677C09K11/675C09K11/665
Inventor 曹仕秀王金玉韩涛贺双双房双强郎天春
Owner CHONGQING UNIV OF ARTS & SCI