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Sulfur-containing phosphor coated with ZnO compound

a technology of zno compound and phosphor, which is applied in the field of sulfur-containing phosphor, can solve the problems of reducing reflection performance, weak light emission of phosphor, and providing cause for electrical defects, so as to achieve the effect of suppressing the adverse effect of hydrogen sulfide gas and not lowering the luminescence properties of phosphor itsel

Active Publication Date: 2014-12-16
MITSUI MINING & SMELTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0021]Under the circumstances, the present invention is to provide a novel coated phosphor which is capable of effectively suppressing the adverse effect of hydrogen sulfide gas.
[0023]The ZnO compound has a property of chemically adsorbing sulfur, and thus when the ZnO compound is present on the surface of a sulfur-containing phosphor, the ZnO compound can absorb hydrogen sulfide gas even if it is generated. Thus, the adverse effect of hydrogen sulfide gas can be effectively suppressed. Further, as the ZnO compound does not absorb light such as an LED and thus has no effect on color, it is also excellent in that the luminescence properties of a phosphor itself are not lowered.

Problems solved by technology

As such, when stored or used in an atmospheric condition, a problem arises in that it reacts with moisture or the like in the air, and as a result of hydrolysis, the phosphor is deteriorated to yield weak light emission.
Yet another problem has been noticed that the sulfur in a sulfur-containing phosphor reacts with water to generate hydrogen sulfide gas, and the resulting hydrogen sulfide gas inhibits, when used for a white LED in particular, curing of a silicone resin to be admixed with the phosphor or oxidizes a metal member present inside the device such as Ag coating film that is coated for increasing reflection ratio of a lead frame (hereinafter, referred to as an “Ag reflection film”), yielding lowered reflection performance or providing cause for electrical defects such as disconnection.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Synthesis of ZnO Compound Coated Sulfur-Containing Phosphor

[0107]To 100 parts by mass of the phosphor that is described below, 0.5 parts by mass of ZnO (average particle diameter of 30 nm) were added together with 50 mL of ethanol in a flask with side arm. By using an ultrasonicator, ZnO was dispersed in ethanol. To the mixture, 10 g of the SrGa2S4:Eu2+ phosphor obtained from Comparative Example 1 were added and the ethanol was evaporated using an evaporator under stirring. As a result, ZnO adhered SrGa2S4:Eu2+ phosphor was obtained. The obtained phosphor was subjected to an ICP analysis by using SPS7800 manufactured by Seiko Instruments Inc. As a result, NZn / NS was found to be 0.00506.

[0108]Further, when the obtained ZnO adhered SrGa2S4:Eu2+ phosphor was observed under SEM (trade name: XL30-SFEG, manufactured by FEI), it was found that primary particles of ZnO are partially adhered in an aggregated state on the surface of the SrGa2S4:Eu2+ phosphor particles, and the surface of the ...

example 2-9

Synthesis of ZnO Compound Coated Sulfur-Containing Phosphor

[0111]To 100 parts by mass of the phosphor that is described below, ZnO (average particle diameter of 30 nm) in an amount of 1 part by mass (Example 2), 2 parts by mass (Example 3), 5 parts by mass (Example 4), 10 parts by mass (Example 5), 20 parts by mass (Example 6), 30 parts by mass (Example 7), 50 parts by mass (Example 8), or 100 parts by mass (Example 9) were added together with 50 mL of ethanol in a flask with side arm. By using an ultrasonicator, ZnO was dispersed in ethanol. To the mixture, 10 g of the SrGa2S4:Eu2+ phosphor obtained from Comparative Example 1 were added and the ethanol was evaporated using an evaporator under stirring. As a result, ZnO adhered SrGa2S4:Eu2+ phosphor was obtained. The obtained phosphor (Examples 2 to 9) was subjected to an ICP analysis by using SPS7800 manufactured by Seiko Instruments Inc. As a result, NZn / NS was found to be 0.01020, 0.02100, 0.05360, 0.10900, 0.21800, 0.32900, 0.55...

example 10

Synthesis of ZnO Compound Coated Sulfur-Containing Phosphor

[0114]To 100 parts by mass of the phosphor that is described below, 2 parts by mass of ZnO (average particle diameter of 30 nm) were added together with 50 mL of ethanol in a flask with side arm. By using an ultrasonicator, ZnO was dispersed in ethanol. To the mixture, 10 g of the CaS:Eu2+ phosphor obtained from Comparative Example 2 were added and the ethanol was evaporated using an evaporator under stirring. As a result, ZnO adhered CaS:Eu2+ phosphor was obtained.

[0115]The obtained phosphor was subjected to an ICP analysis by using SPS7800 manufactured by Seiko Instruments Inc. As a result, NZn / NS was found to be 0.0171.

[0116]Further, when the obtained ZnO adhered CaS:Eu2+ phosphor was observed under SEM (trade name: XL30-SFEG, manufactured by FEI), it was found that primary particles of ZnO are partially adhered in an aggregated state on the surface of the CaS:Eu2+ phosphor particles, and the surface of the phosphor parti...

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Abstract

Provided is a novel coated phosphor capable of effectively suppressing the adverse effects of hydrogen sulfide gas generated by the reaction between a sulfur-containing phosphor and moisture in the air. Provided is a sulfur-containing phosphor having a configuration in which ZnO compound containing Zn and O is present on the surface of a sulfur-containing phosphor having a host material which includes sulfur.

Description

TECHNICAL FIELD[0001]The present invention relates to a sulfur-containing phosphor having a host material which includes sulfur.BACKGROUND ART[0002]As a representative example of a red phosphor, not only a sulfur-containing phosphor having a host material which includes sulfur such as (Ca, Sr)S:Eu, (Zn, Cd)(S, Se):Ag, and Ba2ZnS3:Mn is known but also a red phosphor consisting of calcium sulfide (CaS) as a host material, Eu as a luminescent center (that is, activator), and Mn, Li, Cl, Ce, Gd, or the like as a sensitizing agent (co-activator) is disclosed in Patent Document 1 or 2.[0003]Further, as a green phosphor, a sulfur-based thiogallate phosphor expressed as (Ca, Sr, Ba)(Al, Ga, In)2S4:Eu is known (Patent Documents 3, 4, and 5). Further, as a blue phosphor, a sulfur-containing phosphor such as SrS:Ce, (Sr, Ca)Ga2S4:Ce, BaAl2S4:Eu, and Ba2SiS4:Ce is known.[0004]As described above, a sulfur-containing phosphor having a host material which includes sulfur is excited by an LED or th...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01L29/18H01L33/00B32B5/16B32B15/00C09K11/77C09K11/02H01L33/52H01L33/50
CPCH01L33/504C09K11/7731C09K11/025H01L33/52H01L33/50
Inventor ITOH, JUN-ICHISASAKURA, ASUKAINAMURA, MASAAKIOGAWARA, RIICHIKUMAGAI, AKINORI
Owner MITSUI MINING & SMELTING CO LTD
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