EP0221562A2
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Process for preparing a phosphor
Assignee: Mitsubishi Chemical Corp
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Filing: 1986-11-06
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Granted: —
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Expires: 2006-11-06
Abstract
Abstract A process for preparing a phosphor which comprises heating a phosphor raw material comprising a host material and an activator, in a floating or falling state in a gaseous atmosphere at a temperature at which the activator can be activated to the host material, followed by cooling.
Inventors
- 👤 Masachika Kasei Optonix Kabushiki Yaguchi
- 👤 Takeshi Kasei Optonix Kabushiki Fushiki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 10:37
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/0805
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
47 words
A process for preparing a phosphor which comprises heating a phosphor raw material comprising a host material and an activator, in a floating or falling state in a gaseous atmosphere at a temperature at which the activator can be activated to the host material, followed by cooling.
Claim 2
Dependent Claim
47 words
A process for preparing a phosphor which comprises heating a phosphor raw material comprising a host material and an activator, in a floating or falling state in a gaseous atmosphere at a temperature at which the activator can be activated to the host material, followed by cooling.
Claim 3
Dependent Claim
42 words
The process according to Claim 1, wherein the phosphor raw material is granulated with a composition which is substantially the same as the composition of the phosphor or which, when heated, turns into the same composition as the composition of the phosphor.
Claim 4
Dependent Claim
42 words
The process according to Claim 1, wherein the phosphor raw material contains a raw material in which the host material or an ingredient of the host material is coated on its surface with the activator or a raw material for the activator.
Claim 5
Dependent Claim
35 words
The process according to Claim 1, wherein the phosphor raw material contains a coprecipitate of the host material or an ingredient of the host material with the activator or a raw material for the activator.
Claim 6
Dependent Claim
16 words
The process according to Claim 1, wherein the heating is conducted in a high temperature plasma.
Claim 7
Dependent Claim
25 words
The process according to Claim 2, wherein the heating is conducted at a temperature at which the surface of the granulated phosphor raw material melts.
Claim 8
Dependent Claim
22 words
The process according to Claim 2, wherein the granulated phosphor raw material has a particle size of from 0.2 to 200 µm.
Claim 9
Dependent Claim
28 words
The process according to Claim 2, wherein the granulated phosphor raw material is electrically charged with the same electrical charge prior to the heating in the gaseous atmosphere.
Claim 10
Dependent Claim
13 words
The process according to Claim 2, wherein the phosphor is an oxide-type phosphor.
Claim 11
Dependent Claim
16 words
The process according to Claim 6, wherein the phosphor raw material is composed of a phosphor.
References Cited (Backward Citations)
No citation records indexed.
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