Phosphor, light emitting device, surface light source device, display device and illumination device
US-9200200-B2 · Dec 1, 2015 · US
Red fluorescent material, method for producing red fluorescent material, white light source, illuminating device, and liquid crystal display
US8961827B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8961827-B2 |
| Application number | US-201113814671-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 28, 2011 |
| Priority date | Dec 28, 2010 |
| Publication date | Feb 24, 2015 |
| Grant date | Feb 24, 2015 |
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Abstract
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The present invention provides an efficient red fluorescent material and a method for producing the same, provides a white light source and an illuminating device each of which uses this red fluorescent material to achieve snow-white lighting, and furthermore provides a liquid crystal display having excellent color reproduction. The red fluorescent material contains an element (A), europium (Eu), silicon (Si), carbon (C), oxygen (O), and nitrogen (N), at an atomic ratio of the following in compositional formula (1). [A (m-x) Eu x ][Si (9-y) C y ]O n N [12-2(n-m)/3 ] Note that, in the compositional formula (1), element A is group 2 element including at least calcium (Ca) and strontium (Sr). Also, note that, in the composition formula (1), m, x, y, and n satisfy 3<m<5, 0<x<1, 0<y<9, and 0<n<10, respectively. Such red fluorescent material is able to improve quantum efficiency, compared with a red fluorescent material which does not contain calcium (Ca) but contains strontium (Sr) as the element A.
First claim
Opening claim text (preview).
The invention claimed is: 1. A red fluorescent material containing an element A, europium (Eu), silicon (Si), carbon (C), oxygen (O), and nitrogen (N), at an atomic ratio of the following composition formula (1): [A (m-x) Eu x ][Si (9-y) C y ]O n N [12-2(n-m)/3 ], wherein the element A is an group 2 element including at least calcium (Ca) and strontium (Sr), when, each of atomic ratios of Ca, Sr, and another group 2 element is α, β, and γ, respectively (m=α+β+γ), a relation of…
Assignees
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Classifications
- C09K11/0883Primary
Chemistry & Metallurgy · mapped topic
Cross-Sectional Technologies · mapped topic
- C09K11/77347Primary
Chemistry & Metallurgy · mapped topic
Electricity · mapped topic
Electricity · mapped topic
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Frequently asked questions
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- What does patent US8961827B2 cover?
- The present invention provides an efficient red fluorescent material and a method for producing the same, provides a white light source and an illuminating device each of which uses this red fluorescent material to achieve snow-white lighting, and furthermore provides a liquid crystal display having excellent color reproduction. The red fluorescent material contains an element (A), europium (Eu…
- Who is the assignee on this patent?
- Izawa Takamasa, Kusunoki Tsuneo, Dexerials Corp
- What technology area does this patent fall under?
- Primary CPC classification C09K11/0883. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Feb 24 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).