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Fluoride phosphors and light emitting device

A technology for light-emitting devices and phosphors, which is applied in the fields of light-emitting materials, chemical instruments and methods, semiconductor devices, etc., can solve the problems of low durability and variation of fluoride phosphors, and achieve the effects of excellent durability and excellent light-emitting characteristics.

Inactive Publication Date: 2019-03-05
DENKA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] On the other hand, fluoride phosphors have low durability, and there is a problem that the luminescent color changes with the passage of time. Therefore, it is proposed to improve the durability by controlling the specific peak area ratio obtained by XPS measurement (Patent Document 1 )

Method used

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  • Fluoride phosphors and light emitting device
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  • Fluoride phosphors and light emitting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] At room temperature, 210 mL of hydrofluoric acid (hydrogen fluoride concentration 55% by mass) was added to a fluororesin beaker with a capacity of 500 mL, and 26.3 g of potassium bifluoride powder (manufactured by Wako Pure Chemical Industries, Ltd., special grade reagent) and K 2 MnF 6 1.2 g of the powder was dissolved to prepare an aqueous solution. Next, 7.2 g of silica (manufactured by Denka Corporation, FB-50R) was added to this aqueous solution. When the powder of silica is added to an aqueous solution, the temperature of the aqueous solution rises due to heat of dissolution. The temperature of the aqueous solution reached the highest temperature about 3 minutes after the addition of the silica, and then the dissolution of the silica was completed, so the temperature of the solution dropped. It should be noted that when the silica powder was added, it was confirmed visually that yellow powder started to be produced immediately in the aqueous solution.

[0076]...

Embodiment 2

[0078] At room temperature, 210 mL of hydrofluoric acid (hydrogen fluoride concentration: 55% by mass) was added to a fluororesin beaker with a capacity of 500 mL, and 26.3 g of potassium bifluoride powder (manufactured by Wako Pure Chemical Industries, Ltd., special grade reagent) was dissolved to prepare an aqueous solution. Next, while stirring the aqueous solution, 7.2 g of silica powder (manufactured by Denka Corporation, FB-50R) and K 2 MnF 6 Powder 1.2g. When these powders are added to an aqueous solution, the temperature of the aqueous solution rises due to the heat of dissolution of silica. The temperature of the aqueous solution reached the highest temperature (about 40° C.) about 3 minutes after the addition of the powder, and then the dissolution of the silica was completed, so the temperature of the solution dropped.

[0079] After the silica powder is completely dissolved, continue to stir the aqueous solution for a while to complete the precipitation of the yell...

Embodiment 3

[0081] At room temperature, 210 mL of hydrofluoric acid (hydrogen fluoride concentration: 55% by mass) was added to a fluororesin beaker with a capacity of 500 mL, and 26.3 g of potassium bifluoride powder (manufactured by Wako Pure Chemical Industries, Ltd., special grade reagent) was dissolved to prepare an aqueous solution. Next, while stirring the aqueous solution, 7.2 g of silica powder (manufactured by Denka Corporation, FB-50R) and K 2 MnF 6 Powder 1.2g. When the powder is added to an aqueous solution, the temperature of the aqueous solution rises due to the heat of dissolution of silica. The temperature of the aqueous solution reached the highest temperature (about 40° C.) about 3 minutes after the addition of the powder, and then the dissolution of the silica was completed, so the temperature of the solution dropped.

[0082] After the silica powder is completely dissolved, continue to stir the aqueous solution for a while to complete the precipitation of the yellow...

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Abstract

The invention provides a fluoride phosphors and a light emitting device, which are great in durability and light-emitting feature. The fluoride phosphors has the constitution expressed in a general formula (1), in which A represents at least one alkali metal comprising at least K. The fluoride phosphor has a ratio (A1 / A2) of an area (A1) of a spectrum in a range of from 645 eV or more to less than651 eV in XPS measurement to an area (A2) of a spectrum in a range of from 682.8 eV or more to less than 690 eV in XPS measurement, of 0.0005 to 0.0010.

Description

technical field [0001] The present invention relates to a fluoride phosphor that is excited by blue light to emit red light, and a light-emitting device using the same. Background technique [0002] In recent years, as a white light source, a white light emitting diode (white LED), which is a combination of a light emitting diode (LED) and a phosphor, has been applied to a backlight source of a display and a lighting device. Among them, white LEDs using InGaN-based blue LEDs are widely used as light-emitting diodes. [0003] Phosphors used for white LEDs need to be efficiently excited by light emission of blue LEDs and emit fluorescence of visible light. As such a phosphor, a Ce-activated yttrium aluminum garnet (YAG) phosphor that is efficiently excited by blue light and exhibits broad yellow luminescence can be cited as a representative example. By combining a YAG phosphor alone with a blue LED, it is possible to obtain pseudo-white light emission in a wide visible light...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/61H01L33/50
CPCC09K11/616H01L33/502
Inventor 三谷骏介市川真義
Owner DENKA CO LTD