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Fluo-germanate red fluorescent material for white LED (light-emitting diode) and preparation method of material

A technology of fluorogermanate and red light fluorescence, which is applied in the direction of luminescent materials, chemical instruments and methods, sustainable buildings, etc., can solve the problems of difficult to control the valence state of Mn, low light efficiency of WLED, unsuitable for industrial production, etc., to achieve Easy to industrialized production, low equipment requirements, pure red light effect

Inactive Publication Date: 2017-02-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, a series of A 2 BF 6 :Mn 4+ (A=K, Na, Cs; B=Si, Ge, Sn, Ti, Zr) and NSiF 6 :Mn 4+ (N=Ba, Zn) red light materials have been synthesized and applied, but their preparation methods often consume a lot of HF, it is difficult to control the valence state of Mn in the preparation process, the yield is low, and it is not suitable for industrial production; secondly, The luminous efficiency of WLED synthesized by using it as red phosphor is still not high

Method used

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  • Fluo-germanate red fluorescent material for white LED (light-emitting diode) and preparation method of material
  • Fluo-germanate red fluorescent material for white LED (light-emitting diode) and preparation method of material
  • Fluo-germanate red fluorescent material for white LED (light-emitting diode) and preparation method of material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] K 2 MnF 6 Powder preparation:

[0037] Weigh 2.25 g KMnO 4 Dissolve the powder in 150 ml HF (49wt%) aqueous solution, stir evenly, then add 45 gKHF 2 powder, continue to stir for 40 min (stirring speed is 1000r / min), then rapidly cool to 4 °C with ice water, add 4 ml H 2 o 2 (49wt%) aqueous solution, the color of the reactant solution gradually becomes lighter from purple until it is brownish yellow to obtain K 2 MnF 6 The suspension was left to stand for 4 h, centrifuged and washed 3 times with acetone (centrifugal speed: 4000r / min), and dried at 70 °C for 6 h to obtain K 2 MnF 6 Powder, spare.

Embodiment 2

[0039] QUR 6 :0.5%Mn 4+ Preparation of red fluorescent materials:

[0040] 0.0062 g K 2 MnF 6 powder and 0.5232 g GeO 2 The powder was dissolved in 10 ml of hydrofluoric acid (49wt.%) and stirred for 5 minutes (the stirring speed was 1000 r / min) to obtain a yellow solution; then 1.0447 g of RbF powder and 0.5810 g of KF powder were added to the solution , continue to stir at room temperature for 30 minutes (stirring speed is 1000 r / min), rapidly cool to 5 °C, let stand for 10 h, and then wash with acetone centrifuge for 3 times (centrifugal speed is 4000 r / min), and then in 80 ℃ drying for 6 h to obtain the red fluorescent material KRbGeF 6 :0.5%Mn 4+ .

[0041] The red fluorescent material KRbGeF 6 :0.5%Mn 4+ There is a broad absorption band in the violet region and the blue region, located at 360 nm and 462 nm respectively, among which the absorption band in the blue region is the strongest (462 nm), which can completely match the blue light emitted by the GaInN chi...

Embodiment 3

[0043] QUR 6 :1%Mn 4+ Preparation of red fluorescent materials:

[0044] 0.0124 g K 2 MnF 6 powder and 0.5232 g GeO 2 The powder was dissolved in 10 ml of hydrofluoric acid (49wt.%) and stirred for 5 minutes (the stirring speed was 1000 r / min) to obtain a yellow solution; then 1.0447 g of RbF powder and 0.5810 g of KF powder were added to the solution , continue to stir at room temperature for 10 minutes (stirring speed is 400 r / min), rapidly cool to 0 °C, let stand for 5 h, and then wash with acetone centrifuge three times (centrifugal speed is 1000 r / min), and then in 60 ℃ drying for 2 h to obtain the red fluorescent material KRbGeF 6 :1%Mn 4+ .

[0045] The red fluorescent material KRbGeF 6 :1%Mn 4+ There is a broad absorption band in the violet region and the blue region, located at 360 nm and 462 nm respectively, among which the absorption band in the blue region is the strongest (462 nm), which can completely match the blue light emitted by the GaInN chip; its e...

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Abstract

The invention discloses a fluo-germanate red fluorescent material for a white LED (light-emitting diode) and a preparation method of the material. A chemical composition formula of the fluo-germanate red fluorescent material is KRbGeF6:xMn<4+>, the mole concentration of Ge<4+> doped into Mn<4+> is larger than or equal to 0.5% and smaller than or equal to 30%, and the mole concentration preferably ranges from 0.5% to 15%. The fluo-germanate red fluorescent material is provided with a wide adsorption band in a blue light area, blue light emitted by a GaInN chip can be effectively absorbed, the material is provided with a higher narrow transmitting band in a red light area and can be used for high-quality lighting technologies containing fluorescent tube coating and LED packaging. The preparation method is simple and convenient to operate, mild in reaction condition, low in device requirement and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of inorganic luminescent materials, in particular to a fluorogermanate red fluorescent material for white LEDs and a preparation method thereof. Background technique [0002] White light diode (WLED) is known as a new generation of solid-state light source because of its low energy consumption, green environmental protection, and long service life. It has very broad application prospects in the fields of lighting, transportation, medical equipment, and display screens. . Currently commercialized white LEDs mainly use GaInN blue LED chips to excite Y 3 al 5 o 12 : Ce 3+ (YAG:Ce) yellow phosphor emits white light. Based on the principle of complementary color mixing, YAG:Ce absorbs part of the blue light and then emits yellow light. The emitted yellow light is mixed with the remaining blue light to obtain white light. The synthesis method is relatively simple and mature, without Ultraviolet light leaks an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66
CPCC09K11/665Y02B20/00
Inventor 宋恩海王玲燕张勤远邓婷婷叶柿
Owner SOUTH CHINA UNIV OF TECH
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