Long-persistence blue phosphors

Overview

Information

Number: 6117362
Application: 09/187944
Filing date: 11/06/1998
Issue date: 09/12/2000
Inventor(s): William M. Yen, Weiyi Jia, Lizhu Lu, Huabiao Yuan

US Classification: 117/946; 117/950; 252/301.4R

Citations

Nemoto & Co. (1)

Number	Title	Issue Date
5424006	Phosphorescent phosphor	1995/06/13

Toshiba (1)

Number	Title	Issue Date
4733126	Phosphor and fluorescent lamp using the same	1988/03/22

SamSung Electronics Co. (1)

Number	Title	Issue Date
5350971	Blue-emitting phosphor for use in fluorescent lamps and fluorescent lamp employing the same	1994/09/27

GTE Products (1)

Number	Title	Issue Date
4249108	LaMg Aluminate phosphors activated by europium and lamps incorporating same	1981/02/03

Nichia Chemical Industries, (1)

Number	Title	Issue Date
5376303	Long Decay phoaphors	1994/12/27

OSRAM Sylvania (1)

Number	Title	Issue Date
5358734	Process for producing a blue emitting lamp phosphor	1994/10/25

GTE Sylvania (1)

Number	Title	Issue Date
4110660	Luminescent barium-lithium aluminate phosphors and lamp containing the same	1978/08/29

General Electric (1)

Number	Title	Issue Date
4623816	Fluorescent lamp using multi-layer phosphor coating	1986/11/18

Abstract

Abstract

This invention relates to phosphors including long-persistence blue phosphors. Phosphors of the invention are represented by the general formula: MO . mAl.sub.2 O.sub.3 :Eu.sup.2+,R.sup.3+ wherein m is a number ranging from about 1.6 to about 2.2, M is Sr or a combination of Sr with Ca and Ba or both, R.sup.3+ is a trivalent metal ion or trivalent Bi or a mixture of these trivalent ions, Eu.sup.2+ is present at a level up to about 5 mol % of M, and R.sup.3+ is present at a level up to about 5 mol % of M. Phosphors of this invention include powders, ceramics, single crystals and single crystal fibers. A method of manufacturing improved phosphors and a method of manufacturing single crystal phosphors are also provided.

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Tech Analysis

Class	Subclass	Type	Reference Factor	Citation Factor	Strength	Grant time	Early grant (%)
117	946	Declining	Average	Seminal	Medium	Average	31.6
117	950	Declining	Average	Seminal	Medium	Average	32.2
252	301.4R	Emerging	Average	Seminal	Medium High	Average	26.6