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Red phosphor and method for producing same

A technology of red fluorescence and manufacturing method, which is applied in the field of red phosphor, and can solve the problems of particle surface blackening, durability reduction, optical characteristics reduction, etc.

Active Publication Date: 2021-09-07
STELLA CHEMIFA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, it has been pointed out that the red phosphor containing KSF:Mn has a practical problem of blackening the particle surface due to contact with water, water vapor, etc. in a high-temperature and high-humidity environment.
Specifically, on the particle surface of the red phosphor, manganese dioxide is generated by the reaction of tetravalent manganese ions constituting the red phosphor with water, and the manganese dioxide absorbs excitation light and suppresses fluorescence, resulting in changes in optical characteristics. Decrease in optical properties during deterioration and temporal change (decrease in durability)

Method used

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  • Red phosphor and method for producing same

Examples

Experimental program
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Effect test

Embodiment 1

[0095] Bismuth fluoride (BiF 3 ) 0.15 g was added to 16.6 ml of hydrofluoric acid with a concentration of 43% by mass, and stirred for 5 minutes to prepare a suspension (hydrofluoric acid:bismuth=1408:1 (mixing ratio based on mass)). Next, while stirring the suspension, 5.3 g of the above-mentioned K 2 SiF 6 :Mn 4+ , and further stirred for 10 minutes.

[0096] After the stirring was complete, the suspension was allowed to stand for 10 minutes to allow the dispersed solids to settle. Then, suction filtration was performed, and the filtrate was recovered. In addition, after adding ethanol to the filtrate, suction filtration was performed again to remove the supernatant, and this operation was repeated to wash the filtrate. The filtrate after washing was recovered and dried under a nitrogen atmosphere at a drying temperature of 105° C. to evaporate ethanol. Thus, the red phosphor of Example 1 was produced.

Embodiment 2

[0098] In this example, the amount of bismuth fluoride added was changed from 0.15 g to 0.05 g (hydrofluoric acid:bismuth=423:1 (mixing ratio based on mass)). Other than that, it carried out similarly to Example 1, and produced the red phosphor of Example 2.

Embodiment 3

[0100] In this example, the amount of bismuth fluoride added was changed from 0.15 g to 0.015 g (hydrofluoric acid:bismuth=141:1 (mixing ratio based on mass)). Except for this, it carried out similarly to Example 1, and produced the red phosphor of Example 3.

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Abstract

Provided are: a red phosphor exhibiting excellent optical characteristics and durability even in high temperature, high humidity environments and a method for producing the same. The red phosphor according to the present invention is characterized by containing an Mn-activated complex fluoride represented by general formula (1), and bismuth.A2MF6:Mn4+(1). (In the formula, A represents at least one alkali metal element selected from the group consisting of lithium, sodium, potassium, rubidium, and cesium and M represents at least one tetravalent element selected from the group consisting of silicon, germanium, tin, titanium, zirconium and hafnium.).

Description

technical field [0001] The present invention relates to a red phosphor that is excited by excitation light such as ultraviolet light and blue light to emit red light and a manufacturing method thereof. More specifically, it relates to a red phosphor having excellent optical characteristics and durability in a high-temperature / high-humidity environment by including bismuth in a Mn (manganese)-activated complex fluoride, and a method for producing the same. Background technique [0002] White LEDs (Light Emitting Diode: Light Emitting Diodes) have a longer life and lower power consumption than fluorescent lamps. Therefore, the popularity of backlights as lighting fixtures and displays is rapidly advancing. White LEDs of commercially available lighting fixtures are composed of blue LEDs that emit light from near ultraviolet to blue, and yellow phosphors excited by these lights. Thus, the white LED can irradiate pseudo white light by color-mixing the light emitted from the blu...

Claims

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Application Information

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IPC IPC(8): C09K11/08C09K11/61C09K11/66C09K11/67
CPCY02B20/00C09K11/08C09K11/61C09K11/66C09K11/67
Inventor 鹰取浩明熊泽伸哉荒川徹哉西田哲郎
Owner STELLA CHEMIFA CORP
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