US 7,682,525 B2 · Material composition for producing blue phosphor by excitation of UV light and method for making the same

Abstract

A phosphor material composition for producing blue phosphor by the excitation of UV light and a method for making the same. The phosphor material is an alkaline-earth silicates compound with a chemical formula of A2-xSiO4:Cex. A includes one or more elements selected from the collection of Ba, Sr and Ca alkaline-earth metals. The host is A2-xSiO4 and the activator is Ce3+. The characteristic of this invention is the blue phosphor material with a high luminescence intensity that can be excited by UV light. In addition, the material in this invention is easy and fast to prepare in a large amount, and the material itself has advantage such as color purity and thermal stability, so as to have a high industrial value.

Claims4

Dependent claims

A method of making a phosphor material composition for producing a blue phosphor by excitation of UV light, and more particularly a method of making a phosphor material of an alkaline-earth silicates compound, comprising the steps of:

mixing a first reactant containing strontium (Sr), a second reactant containing silicon (Si) and a third reactant containing cerium (Ce) into a mixture;
heating the mixture in the argon gas environment at 1100˜1300° C. for 1˜4 hours to form an alkaline-earth silicate precursor;
and
heating the alkaline-earth silicate precursor in a reduction environment having a mixture of hydrogen (H2)/Nitrogen (N2) at 1100˜1300° C. for 4˜8 hours to form a finished good.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

11/768,908Filed 27 Jun 2007

Published

US 2009/0001319 A11 Jan 2009

Granted

23 Mar 2010

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

H05B 33/10
Electroluminescent light sources: apparatus or processes specially adapted to the manufacture of electroluminescent light sources
C09K 11/77212
Containing cerium: silicates
H05B 33/14
Light sources with substantially two-dimensional [2D] radiating surfaces: characterised by the chemical or physical composition or the arrangement…
H05B
Electric heating

Material composition for producing blue phosphor by excitation of UV light and method for making the same

Life of this patent

Material composition for producing blue phosphor by excitation of UV light and method for making the same

Life of this patent

Abstract

Claims4