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Green Emitting Phosphor

a green emitting phosphor and green technology, applied in the direction of discharge tube luminescent screen, discharge tube/lamp details, luminescent composition, etc., can solve the problems of poor color rendering properties and the inability to show the colors illuminated by natural light, and achieve high internal quantum efficiency

Inactive Publication Date: 2012-04-05
MITSUI MINING & SMELTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The enhanced internal quantum efficiency of the phosphor leads to increased light-emission intensity and improved color rendering properties, enabling the production of more effective white light-emitting devices with reduced phosphor usage.

Problems solved by technology

White LEDs currently in use are constituted by combining a blue LED and a YAG:Ce (yellow); they bear the problem of having poor color rendering properties to show natural coloration, and in particular, when a red object or a human skin is illuminated with such currently used white LEDs, they cannot show the colors illuminated by natural light.

Method used

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Examples

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example 1

[0114]Using SrS, Ga2S3 and EuS as starting raw materials, SrS and Ga2S3 were mixed so that the atomic ratio Ga / Sr was 1.98 and EuS was mixed so as to have 1.0 mol % with respect to Sr, which were mixed for 100 minutes with a paint shaker using a Ø3 mm zirconia ball as a medium. The obtained mixture was fired in a hydrogen sulfide atmosphere at 1130° C. for 4 hours. Next, the fired material was crushed for one minute with an automatic mortar grinder (“ALM-360T” manufactured by Nitto Kagaku Co.), and using sieves with 140 mesh and 440 mesh openings, the material under the sieve with 140 mesh opening and above the sieve with 440 mesh opening was recovered to obtain a phosphor powder sample.

example 2

[0115]Using SrS, Ga2S3 and EuS as starting raw materials, SrS and Ga2S3 were mixed so that the atomic ratio Ga / Sr was 2.00, and while EuS was mixed so as to have 1.0 mol % with respect to Sr, MgCl2 was mixed as flux so as to have 0.5wt % with respect to SrGa2S4, which were mixed for 100 minutes with a paint shaker using a Ø3 mm zirconia ball as a medium. The obtained mixture was fired in a hydrogen sulfide atmosphere at 1100° C. for 4 hours. Next, the fired material was crushed for one minute with an automatic mortar grinder (“ALM-360T” manufactured by Nitto Kagaku Co.), and using sieves with 140 mesh and 440 mesh openings, the material under the sieve with 140 mesh opening and above the sieve with 440 mesh opening was recovered to obtain a phosphor powder (sample).

example 3

[0116]Using SrS, Ga2S3 and EuS as starting raw materials, SrS and Ga2S3 were mixed so that the atomic ratio Ga / Sr was 2.15, and EuS was mixed so as to have 1.0 mol % with respect to Sr, which were mixed for 100 minutes with a paint shaker using a Ø3 mm zirconia ball as a medium. The obtained mixture was fired in a hydrogen sulfide atmosphere at 1100° C. for 6 hours. Next, the fired material was crushed for one minute with an automatic mortar grinder (“ALM-360T” manufactured by Nitto Kagaku Co.), furthermore, annealing in an argon atmosphere at 1100° C. for 4 hours was carried out, and using sieves with 140 mesh and 440 mesh openings, the material under the sieve with 140 mesh opening and above the sieve with 440 mesh opening was recovered to obtain a phosphor powder (sample).

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Abstract

A green emitting phosphor is provided, allowing the internal quantum efficiency to be increased. The green emitting phosphor comprises a mother crystal containing Sr, Ga and S, and a luminescent center, characterized in that, in an XRD pattern, the ratio of the diffraction intensity of the maximum peak appearing at diffraction angle 2θ=14 to 20° over the diffraction intensity of the maximum peak appearing at diffraction angle 2θ=21 to 27° is 0.4 or greater.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is a continuation of co-pending Application Ser. No. 13 / 056,834 filed Jan. 31, 2011, entitled Green Emitting Phosphor, the contents of which are incorporated by reference herein in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a green emitting phosphor. Specifically, it relates to a green emitting phosphor that can be excited with a blue LED or a near-ultraviolet LED, and can be used as a phosphor for lighting or be used as a backlight for liquid crystal display or a display phosphor such as for FED (Field Emission Display), PDP (plasma display) and EL (electroluminescence).[0004]2. Description of Related Art[0005]Although the mainstream light sources for lighting currently are fluorescent lights and incandescent light bulbs, those using LEDs (light-emitting diodes) as the light source, compared to fluorescent lights or the like, have less consumption power, l...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01J1/62C09K11/80
CPCH01L33/502C09K11/7731
Inventor OGAWARA, RIICHISASAKURA, ASUKAITOH, JUN-ICHIMORINAKA, TAIZOU
Owner MITSUI MINING & SMELTING CO LTD
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