Method for Producing Luminescent Particles with a Protective Layer and Luminescent Particles Having a Protective Layer
US-2021040614-A1 · Feb 11, 2021 · US
Fluoride-based phosphors for light emitting device
US11053438B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11053438-B2 |
| Application number | US-201916572515-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 16, 2019 |
| Priority date | Sep 27, 2018 |
| Publication date | Jul 6, 2021 |
| Grant date | Jul 6, 2021 |
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- Title
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- Abstract
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Abstract
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The invention relates to a red phosphor with a narrow full width at half maximum, having improved decay time and resolving afterglow phenomenon. The fluoride-based phosphor according to the invention is characterized in including a host having a composition of the following [Formula 1] including rubidium (Rb), cesium (Cs), silicon (Si) and fluorine (F) as constituent elements, and manganese (Mn) which is solid solution treated in the host as an activator:Rb3-xCsxSiF7 [Formula 1](where, 0<x<3).
First claim
Opening claim text (preview).
What is claimed is: 1. A fluoride-based phosphor comprising a host having a composition of the following [Formula 1] including rubidium (Rb), cesium (Cs), silicon (Si) and fluorine (F) as constituent elements, and manganese (Mn) which is solid solution treated in the host as an activator: Rb 3-x Cs x SiF 7 [Formula 1] (where, 0<x<3). 2. The fluoride-based phosphor according to claim 1 , wherein a molar ratio of the rubidium (Rb), the cesium (Cs) and the silicon (Si), contained in the host is 2:1:1. 3. The fluoride-based phosphor according to claim 1 , wherein a solid solution amount of the manganese (Mn) is 0.001 to 0.2 in a molar ratio. 4. The fluoride-based phosphor according to claim 1 , having decay time, if measuring a time consumed for decreasing light-emitting intensity to 10%, of less than 14 ms. 5. The fluoride-based phosphor according to claim 1 , wherein the phosphor has an excitation wavelength of 365 to 480 nm. 6. The fluoride-based phosphor according to claim 1 , wherein the phosphor has a wavelength of luminescent center of 610 to 670 nm. 7. The fluoride-based phosphor according to claim 1 , wherein a crystal structure of the host is tetragonal. 8. The fluoride-based phosphor according to claim 1 , wherein the phosphor has a value variable within 10% with lattice constants of the host of a=b=8.1466 Å, and c=5.9650 Å.
Assignees
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Classifications
Encapsulations, e.g. protective coatings · CPC title
Wavelength conversion materials · CPC title
- C09K11/616Primary
with alkali or alkaline earth metals · CPC title
- C09K11/61Primary
containing fluorine, chlorine, bromine, iodine or unspecified halogen elements · CPC title
with alkali or alkakine earth metals · CPC title
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- What does patent US11053438B2 cover?
- The invention relates to a red phosphor with a narrow full width at half maximum, having improved decay time and resolving afterglow phenomenon. The fluoride-based phosphor according to the invention is characterized in including a host having a composition of the following [Formula 1] including rubidium (Rb), cesium (Cs), silicon (Si) and fluorine (F) as constituent elements, and manganese (Mn…
- Who is the assignee on this patent?
- Industry Academia Cooperation Group Of Sejong Univ
- What technology area does this patent fall under?
- Primary CPC classification C09K11/616. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jul 06 2021 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 7 related publications on this page (citations in our corpus or others sharing the same primary CPC).