Phosphor, light emitting device and white light emitting diode

A light-emitting diode and white light-emitting technology, which is applied in the direction of light-emitting materials, semiconductor devices, electrical components, etc., can solve the problem of reduced luminous intensity

Inactive Publication Date: 2008-02-13
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The phosphors described in these gazettes have lower luminous intensity when the ambient temperature is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Lithium carbonate (manufactured by Kanto Chemical Co., Ltd., purity 99%), strontium carbonate (Sakai Chemical Industry Co., Ltd. Manufactured, purity 99% or more), calcium carbonate (manufactured by Ube Materials Co., Ltd., purity 99.9%), europium oxide (manufactured by Shin-Etsu Chemical Co., Ltd., purity 99.99%), silicon dioxide (manufactured by Nippon Aerosil Co., Ltd., purity 99.99%) ), a total of 10 parts by weight of these materials and 150 parts by weight of isopropanol were added in the wet ball mill, and mixed for 4 hours to obtain a slurry. After drying the slurry with an evaporator at 70°C, the resulting metal compound mixture was fired at 900°C for 12 hours in the air, and then slowly cooled (cooling rate 5°C / min) to room temperature (25°C). . Next, after crushing with an agate mortar, the 2 N 2 Firing was carried out at 900° C. for 12 hours in an atmosphere, and then slowly cooled to room temperature (cooling rate: 5° C. / minute), whereby phosphor 2 was o...

Embodiment 2

[0083] Lithium carbonate (manufactured by Kanto Chemical Co., Ltd., purity 99%), strontium carbonate (Sakai Chemical Industry Co., Ltd. Manufactured, purity 99% or more), barium carbonate (Nippon Chemical Industry Co., Ltd., purity 99% or more), europium oxide (manufactured by Shin-Etsu Chemical Co., Ltd., purity 99.99%), silicon dioxide (manufactured by Nippon Aerosil Co., Ltd., purity 99.99%) %) as a raw material, the same operation as in Example 1 was performed to obtain phosphor 3 . Table 1 shows the composition of the phosphor 3, and Table 2 shows the measurement results of the emission intensity.

Embodiment 3

[0085] Lithium carbonate (manufactured by Kanto Chemical Co., Ltd., purity 99%), strontium carbonate (Sakai Chemical Industry Co., Ltd., purity 99% or more), calcium carbonate (Ube Material Co., Ltd., purity 99.9%), europium oxide (Shin-Etsu Chemical Co., Ltd., purity 99.99%), silicon dioxide (Nippon Aerosil Co., Ltd. , purity 99.99%), ammonium chloride (manufactured by Wako Pure Chemical Industries, Ltd., purity 99%), a total of 10 parts by weight of these compounds and 150 parts by weight of isopropanol were added to a wet ball mill and mixed for 4 hours to obtain The slurry. After drying the slurry at 70° C. with an evaporator, the obtained metal compound mixture was fired at 900° C. for 12 hours in an air atmosphere, and then gradually cooled to room temperature. Next, after crushing with an agate mortar, the 2 N 2 After baking at 900° C. for 12 hours in an atmosphere, the phosphor was gradually cooled to room temperature, and Phosphor 4 was obtained. Table 1 shows the...

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PUM

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Abstract

The invention provides a phosphor, a light emitting device and a white light emitting diode. The phosphor includes a compound represented by formula (1), and Eu as an activator. aM12O bM2O cM3O2 (1) [In the formula (1), M1 is at least one selected from the group consisting of Li, Na, K, Rb and Cs, and M2 is selected from the group consisting of Ca, Sr, Ba, Mg and At least one selected from the group consisting of Zn, M3 is at least one selected from the group consisting of Si and Ge, 0.1≦a≦1.5, 0.8≦b≦1.2 and 0.8≦c≦1.2, wherein, when M1 is Li , when M3 is Si and a=b=c=1, M2 is not Sr alone. ]

Description

technical field [0001] The invention relates to a phosphor, a light emitting device and a light emitting diode. Specifically, the present invention relates to a phosphor having low temperature dependence of emission intensity and excellent thermal stability, a light-emitting device and a light-emitting diode including the phosphor. Background technique [0002] Phosphors are used in light-emitting devices (such as white light-emitting diodes, hereinafter referred to as "LEDs") that use light in the ultraviolet to blue region as an excitation source. As phosphors for white LEDs, for example, the formula Y 3 Al 5 o 12 : the compound represented by Ce (Japanese Unexamined Publication No. 10-242513); by (Ba 1-x-y-z Sr x Ca y ) 2 SiO 4 :Eu z The compound represented by the formula Li 2 SrSiO 4 : A compound represented by Eu (International Publication No. 03 / 80763 International Gazette). [0003] The phosphors described in these publications have lower luminous intensi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/59C09K11/61C09K11/66H01L33/00H01L33/32H01L33/50
Inventor 今成裕一郎宫崎进户田健司
Owner SUMITOMO CHEM CO LTD
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