Red phosphor and preparation method and application of red phosphor

A technology of red fluorescent powder and fluorescent powder, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems of no Mn transfer characteristics, fluorescent powder is difficult to dissolve in water, etc., and achieve improved luminous intensity, simple method, and high luminous intensity Effect

Active Publication Date: 2020-11-24
CHONGQING UNIV OF ARTS & SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, NaHF also exists in the prior art 2 :Mn 4+ Phosphor, but also utilizes Mn 4+ Instead of the matrix NaHF 2 Central ion Na with unequal central charges + , so that Mn 4+ doping, and the Mn prepared above 4+ The doped phosphor is insoluble in water and has no Mn 4+ transfer characteristics
In the field of preparation of red phosphor powder, there is no use of KHF 2 Related reports on the preparation of phosphors as substrates

Method used

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  • Red phosphor and preparation method and application of red phosphor
  • Red phosphor and preparation method and application of red phosphor
  • Red phosphor and preparation method and application of red phosphor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A preparation method of fluoride-based fluorescent powder, carried out as follows:

[0046] (1) Preparation of KHF 2 :Mn 4+ : Add KF to KMnO 4 React directly with the mixed solution formed by HF with a mass concentration of 26% at normal temperature and pressure, filter, wash and dry after the reaction, KF, HF and KMnO 4 The dosage relationship is 150:250:6;

[0047] (2) Mn 4+ Transfer: KHF 2 :Mn 4+ Dissolve in solvent distilled water, add fluoride matrix K 2 TiF 6 Place the reaction, wash, filter and dry after the reaction to obtain new doped Mn 4+ The red phosphor product K 2 TiF 6 :Mn 4+ , KHF 2 :Mn 4 + 、K 2 TiF 6 The molar ratio of matrix and distilled water: 1:4:80.

[0048] combined with Figure 1-5 As shown in the detection results, it can be seen that the red fluorescent powder KHF prepared by the preparation method of the present invention is 2 :Mn 4+ , the excitation peaks are located at 356nm and 456nm, and the emission spectrum is emitted...

Embodiment 2

[0051] A preparation method of fluoride-based fluorescent powder, carried out as follows:

[0052] (1) Preparation of Na 0.01 K 0.99 HF 2 :Mn 4+ : Add NaF to KF to form a mixture, the molar percentage of NaF is 1%, and the mixture is added to KMnO 4 It reacts directly with the mixed solution formed by 26% HF at normal temperature and pressure. After the reaction is completed, it is filtered, washed and dried. The mixture, HF and KMnO 4 The dosage relationship is 150:250:6;

[0053] (2) Mn 4+ Transfer: Na 0.01 K 0.99 HF 2 :Mn 4+ Dissolve in solvent distilled water, add fluoride matrix K 2 TiF 6 Place the reaction, wash, filter and dry after the reaction to obtain a new doped Mn 4+ The red phosphor product K2 TiF 6 :Mn 4+ , KHF 2 :Mn 4+ 、K 2 TiF 6 The molar ratio of matrix and distilled water is 1:4:80.

[0054] Na prepared by embodiment 2 0.01 K 0.99 HF 2 :Mn 4+ The KHF prepared by red fluorescent powder and embodiment 1 2 :Mn 4+ Compared with that, the...

Embodiment 3

[0056] A preparation method of fluoride-based fluorescent powder, carried out as follows:

[0057] (1) Preparation of KHF 2 :Mn 4+ : KF·2H 2 O joined KMnO 4 React directly with the mixed solution formed by HF with a mass concentration of 20% at normal temperature and pressure, filter, wash and dry after the reaction, KF, HF and KMnO 4 The molar ratio is 1500:2500:1;

[0058] (2) Mn 4+ Transfer: KHF 2 :Mn 4+ Dissolve in solvent distilled water, add fluoride matrix BaGeF 6 Place the reaction, wash, filter and dry after the reaction to obtain new doped Mn 4+ The red phosphor product BaGeF 6 :Mn 4+ , KHF 2 :Mn 4 + , BaGeF 6 The molar ratio relationship between matrix and distilled water: 1:4:300.

[0059] combined with Figure 6-10 As shown in the detection results, it can be seen that the red fluorescent powder KHF prepared by the preparation method of the present invention is 2 :Mn 4+ , the excitation peaks are located at 364nm and 462nm, and the emission spect...

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Abstract

A red phosphor with the characteristics of transferring Mn4+ is characterized in that the composition of the red phosphor is KHF2 : Mn4+, wherein KHF2 is the matrix, and the content ratio of Mn element in the phosphor 0 at . % (Mn at . % (20.0 at . %. The red phosphor KHF2 : Mn4+ of the present invention is excellent in water solubility, and has the outstanding advantages of broadband excitation,narrowband emission, high luminous intensity, high color rendering, etc., in addition, the red phosphor of the invention has Mn4+ transferring characteristics, and can be directly used in water to prepare other fluoride matrix phosphors.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a red fluorescent powder and its preparation and application. Background technique [0002] Compared with traditional lighting sources, white light diodes (LEDs) have the advantages of high luminous efficiency, environmental protection, long service life and compact curing. The development of white light diodes is of great significance to saving global energy. At present, commercialized white LEDs are generally realized by the method of "blue chip + yellow phosphor", but due to the lack of red components, the shortcomings of LED devices such as low color rendering, high color temperature, and narrow color gamut are gradually emerging, which can no longer meet the needs of the times. development and people's needs. Therefore, high-performance red phosphor has become one of the key bottlenecks affecting the development of white LEDs. The currently used red fluoresce...

Claims

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Application Information

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IPC IPC(8): C09K11/61C09K11/67C09K11/66
CPCC09K11/616C09K11/675C09K11/665Y02B20/00
Inventor 韩涛王金玉郎天春曹仕秀彭玲玲刘碧桃强琴平
Owner CHONGQING UNIV OF ARTS & SCI
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