Mn<4+> doped fluoroaluminate red fluorescent powder as well as preparation method and application thereof

A red phosphor, fluoroaluminate technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve problems such as instability, and achieve the effects of phase purity, wide color gamut, and high luminous efficiency

Inactive Publication Date: 2017-11-24
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for better control on particle size distribution without affecting their properties or performance. It uses specific chemical substances that help make it easier to produce particles smaller than 50 nanometers (nm) while still maintaining good quality. These small particles can be used to create light sources like yellowish green lights emitting red colors when excited at certain frequencies. By adjusting these parameters, different colored lights may appear similar but less distinctive from each others. Overall this new method provides technical benefits such improved production efficacy and wider range of applications.

Problems solved by technology

This patented technical problem addressed in this patents relates to creation of yellowish colored luminaLED displays due to limitations such as poor spectral range and insufficiently visible colors caused by traditional red phthalocyanine sulfides containing rare earth elements like Eu, Ce, Prb, Dy, Ho, Tm, Yt, Lao, Cpz, Er, Gd, B1/Li_xL films made from these sources. Additionally, current processes require expensive equipment and involve complicated steps, making them time-consuming and costly.

Method used

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  • Mn&lt;4+&gt; doped fluoroaluminate red fluorescent powder as well as preparation method and application thereof
  • Mn&lt;4+&gt; doped fluoroaluminate red fluorescent powder as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0024] a kind of Mn 4+ The preparation method of doped fluoroaluminate red fluorescent powder is characterized in that the steps are as follows: add hydrofluoric acid and water into a polytetrafluoroethylene container, and then add K 2 MnF 6 , stir to make it dissolve and then add KF; after KF dissolves, add K 3 AlF 6 Continue to stir until K 3 AlF 6 Continue stirring for 30 minutes after complete dissolution; stop stirring for 6 hours, filter with suction, take the filter cake and dry it under vacuum at 70°C to obtain the Mn 4+ Doped fluoroaluminate red phosphor. K 3 AlF 6 Can not exist stably in aqueous solution, partly decomposed into K 2 AlF 5 ·H 2 O, add KF·2H to the reaction system 2 O helps suppress K 3 AlF 6 decomposition to synthesize pure phase K 3 AlF 6 .

[0025] KF and K 3 AlF 6 The molar ratio is 0.4:1, K 2 MnF 6 with K 3 AlF 6 The molar ratio is 0.02:1.

[0026] The mass concentration of described hydrofluoric acid is 10%, and the mass concen

Embodiment 2

[0028] a kind of Mn 4+ The preparation method of doped fluoroaluminate red fluorescent powder is characterized in that the steps are as follows: add hydrofluoric acid and water into a polytetrafluoroethylene container, and then add K 2 MnF 6 , stir to make it dissolve and then add KF; after KF dissolves, add K 3 AlF 6 Continue to stir until K 3 AlF 6 Continue stirring for 30 minutes after complete dissolution; stop stirring for 24 hours, filter with suction, take the filter cake and dry it under vacuum at 70°C to obtain the Mn 4+ Doped fluoroaluminate red phosphor. K 3 AlF 6 Can not exist stably in aqueous solution, partly decomposed into K 2 AlF 5 ·H 2 O, add KF·2H to the reaction system 2 O helps suppress K 3 AlF 6 decomposition to synthesize pure phase K 3 AlF 6 .

[0029] KF and K 3 AlF 6 The molar ratio is 6:1, K 2 MnF 6 with K 3 AlF 6 The molar ratio is 0.05:1.

[0030] The mass concentration of the hydrofluoric acid is 10% to 40%, the mass concentrat

Embodiment 3

[0032] a kind of Mn 4+ The preparation method of doped fluoroaluminate red fluorescent powder is characterized in that the steps are as follows: add hydrofluoric acid and water into a polytetrafluoroethylene container, and then add K 2 MnF 6 , stir to make it dissolve and then add KF; after KF dissolves, add K 3 AlF 6 Continue to stir until K 3 AlF 6 Continue stirring for 30 minutes after complete dissolution; stop stirring for 18 hours, filter with suction, take the filter cake and dry it under vacuum at 70°C to obtain the Mn 4+ Doped fluoroaluminate red phosphor. K 3 AlF 6 Can not exist stably in aqueous solution, partly decomposed into K 2 AlF 5 ·H 2 O, add KF·2H to the reaction system 2 O helps suppress K 3 AlF 6 decomposition to synthesize pure phase K 3 AlF 6 .

[0033] KF and K 3 AlF 6 The molar ratio is 2:1, K 2 MnF 6 with K 3 AlF 6 The molar ratio is 0.03:1. The mass concentration of hydrofluoric acid is 20%, and the mass concentration of solute in

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Abstract

The invention discloses Mn<4+> doped fluoroaluminate red fluorescent powder as well as a preparation method and an application thereof. The method comprises steps as follows: hydrofluoric acid and water are added to a polytetrafluoroethylene container, K2MnF6 is added and stirred to be dissolved, and then KF is added; after KF is dissolved, K3AlF6 is added and continuously stirred to be completely dissolved, and then the mixture is continuously stirred for 30 min; the mixture is left to stand after stirring is stopped, suction filtration is performed, a filter cake is dried under the vacuum condition at the temperature of 70 DEG C, and the Mn<4+> doped fluoroaluminate red fluorescent powder is obtained. Compared with the prior art, the K3AlF6:Mn<4+> red fluorescent powder is synthesized in a hydrofluoric acid aqueous solution, and the diluted aqueous solution has a function of purifying the K3AlF6 phase; excessive KF.2H2O is added, so that the K3AlF6 phase is crystallized and separated to be purified in the aqueous solution; the obtained fluorescent powder has a narrow emission spectrum range, and the reabsorption phenomenon is effectively avoided; the phase of the synthesized fluorescent powder is pure, and the light emitting efficiency and collection rate are high; the color gamut range of a white light LED device packaged by the fluorescent powder is wide.

Description

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Claims

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Application Information

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Owner HEFEI UNIV OF TECH
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