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Phosphor and light-emitting device

Inactive Publication Date: 2012-10-11
KOITO MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014]According to this embodiment, a light-emitting device which emits light of incandescent color at 3,200 K or less can be achieved with relative ease.
[0016]According to this embodiment, a light-emitting device which emits light with a relatively low color temperature with a power consumption lower than that of conventional incandescent lamps can be achieved.
[0017]The light-emitting device may also be configured to emit light so that an illuminance of 50 lx or more can be provided at a place 70 cm away from the device when a power of 1 W is supplied to the device. This enables high-efficiency lighting and a wide variety of applications.

Problems solved by technology

Unfortunately, the light-emitting devices described above tend to have a color temperature higher than that achieved by traditional incandescent or fluorescent lamps.

Method used

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  • Phosphor and light-emitting device
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  • Phosphor and light-emitting device

Examples

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examples

[0085]The above phosphor and the above light-emitting device are more specifically described below using examples. It will be understood that the raw materials for the phosphor and the light-emitting device, the production method, the chemical composition of the phosphor, and other features described below are not intended to limit embodiments of the phosphor and the light-emitting device according to the invention.

[0086]First, phosphors used in the light-emitting devices of the examples are described in detail.

[0087]

[0088]Phosphor 1 is a phosphor represented by (Ca0.6,Sr0.25,Eu0.15)7 / 6SiO3Cl2 / 6. Phosphor 1 is so synthesized as to have the general formula (M2x,M3y,M4z)mM1O3X2 / n, wherein M1=Si, M2=Ca, M3=Sr, X═Cl, M4=Eu2+, m=7 / 6, n=6, the contents x, y, and z of M2, M3, and M4 are 0.60, 0.25, and 0.15, respectively. In phosphor 1, cristobalite is produced, because SiO2 is added as a raw material in an excess mixing ratio. Phosphor 1 was produced as described below. First, the raw mat...

example

[0132]In this example, phosphors 1 and 13 were used as the first and second phosphors, respectively, and a light-emitting device was prepared using a phosphor paste containing a mixture of them. In this example, a phosphor mixture of phosphors 1 and 9 (2:1 in weight ratio) was used.

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Abstract

A phosphor has the general formula (M2x,M3y,M4z)mM1O3X(2 / n), wherein M1 represents at least one element including at least Si and selected from the group consisting of Si, Ge, Ti, Zr, and Sn, M2 represents at least one element including at least Ca and selected from the group consisting of Ca, Mg, Cd, Co, and Zn, M3 represents at least one element including at least Sr and selected from the group consisting of Sr, Ra, Ba, and Pb, X represents at least one halogen element, M4 represents at least one element including at least Eu2+ and selected from the group consisting of rare-earth elements and Mn, m is in the range 1≦m≦4 / 3, n is in the range 5≦n≦7.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is based upon and claims the benefit of priority from the prior Japan Patent Application No. PCT / JP2010 / 006793, filed on Nov. 19, 2010, Japanese Patent Application No. 2010-0232699, filed on Oct. 15, 2010, and Japanese Patent Application No. 2009-0289201, filed on Dec. 21, 2009, the entire contents of which are incorporated herein by referenceBACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a phosphor (fluorescent material) which is excited efficiently by ultraviolet light or short-wavelength visible light to emit light, and to a light-emitting device produced therewith.[0004]2. Description of the Related Art[0005]A variety of light-emitting devices are known, which are configured to produce light of the desired color by using a combination of a light-emitting element and phosphors which are excited by the light emitted from the light-emitting element and producing light in a wavele...

Claims

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Application Information

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IPC IPC(8): C09K11/78C09K11/79H01L33/50
CPCC09K11/7734C09K11/7739H01L33/502H01L33/504H05B33/14H01L2224/48091H01L2224/45144H01L2224/73265H01L2924/00014H01L2924/00H01L2224/45139H01L2924/181H01L2924/00011C09K11/77342H01L2924/00012H01L2224/45015H01L2924/207H01L2924/01049C09K11/61C09K11/08H01L33/50
Inventor SASAKI, YASUTAKADAICHO, HISAYOSHIAOYAGI, SHINOBUSAWA, HIROSHI
Owner KOITO MFG CO LTD
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