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Mn<4+>-activated oxyfluoride red phosphor and preparation method thereof

A red phosphor, oxyfluoride technology, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as blank oxyfluoride powder, and achieve the effects of less HF, high color purity, and high luminous efficiency

Active Publication Date: 2017-08-15
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a large amount of Mn has been developed 4+ Activated fluoride phosphors, however Mn 4+ The research and development of activated oxyfluoride powder is still blank

Method used

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  • Mn&lt;4+&gt;-activated oxyfluoride red phosphor and preparation method thereof
  • Mn&lt;4+&gt;-activated oxyfluoride red phosphor and preparation method thereof
  • Mn&lt;4+&gt;-activated oxyfluoride red phosphor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Measure 1.5mL HF solution (40%) in a small plastic beaker, weigh 1.8 grams of sodium tungstate dihydrate Na 2 WO 4 2H 2 O was dissolved in HF solution, and after stirring for 5 min at a magnetic stirring rate of 600 rpm, 0.0024 g of K was added 2 MnF 6 . After stirring until the solution was slightly golden, 3.5 mL of methanol was added dropwise to obtain a precipitate, which was filtered, washed, and dried at 70°C for 5 h to obtain the product. X-ray analysis of the structure shows that the obtained luminescent material is Na 2 WO 2 f 4 (Such as figure 2 shown). The crystal structure shows that [WO 2 f 4 ] is a mixed-coordination octahedral structure without centrosymmetry (such as figure 1 shown). Utilize the FLS920 fluorescence spectrometer to measure the excitation spectrum of the sample (such as image 3 shown) and emission spectrum (as Figure 4 shown) quantum efficiency (as Figure 5 shown), the results show that Na 2 WO 2 f4 :Mn 4+ It has stro...

Embodiment 2

[0034] Measure 1.5mL HF solution (40%) in a small plastic beaker, weigh 1.8 grams of sodium molybdate dihydrate Na 2 MoO 4 2H 2 O was dissolved in HF solution, and after stirring for 5 min at a magnetic stirring rate of 600 rpm, 0.0024 g of K was added 2 MnF 6 . After stirring until the solution was slightly golden, 3.5 mL of methanol was added dropwise to obtain a precipitate, which was filtered, washed, and dried at 70°C for 5 h to obtain the product.

Embodiment 3

[0036] Measure 1.5mL HF solution (40%) in a small plastic beaker, weigh 1.5g potassium tungstate K 2 WO 4 2H 2 O was dissolved in HF solution, and after stirring for 5 min at a magnetic stirring rate of 600 rpm, 0.0024 g of K was added 2 MnF 6 . After stirring until the solution was slightly golden, 3.5 mL of methanol was added dropwise to obtain a precipitate, which was filtered, washed, and dried at 70°C for 5 h to obtain the product.

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Abstract

The invention relates to Mn<4+>-activated oxyfluoride red phosphor and a preparation method thereof. The general chemical formula of the red phosphor is A2[MO2F4]:Mn<4+>, wherein A can be Na, K, Rb or Cs, and M is Mo or W. According to the red phosphor, charge compensation can be carried out by introducing ions such as Li<+>, K<+>, Na<+>, Rb<+>, Cs<+>, Ca<2+>, Mg<2+>, Zn<2+>, Ba<2+> and Sr<2+>, so that the luminescence property is further improved. The red phosphor provided by the invention has a good compensation effect when being applied to a white light-emitting diode. The red phosphor can be efficiently excited by blue light, is emitted in a narrow-band linear shape, is high in color purity and quantum yield and simple in preparation technology, and needs less hydrogen fluoride (HF) when being prepared.

Description

technical field [0001] The invention relates to the field of solid luminescent materials, in particular to Mn 4+ Activated oxyfluoride red fluorescent powder and its preparation method. Background technique [0002] Due to its high efficiency, energy saving, environmental protection, long life and many other advantages, LED is widely used in lighting, backlight display, plant growth, automobile and other fields. Currently, based on InGaN blue LED chips and YAG:Ce 3+ White light LED technology constructed of yellow phosphor has been commercially applied. However, the white light obtained by this technology has problems such as high color temperature and low color rendering index due to insufficient red light components. In order to solve this problem, the introduction of red phosphors that can be effectively excited by blue light into commercial white LEDs has always attracted the attention of researchers at home and abroad. [0003] mn 4+ The activated fluoride red phos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/68
CPCC09K11/681
Inventor 胡桃林航王元生
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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