US Patent No: 5,702,643

Number of patents in Portfolio can not be more than 2000

ZnS:Cu electroluminescent phosphor and method of making same

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Abstract

A improved ZnS:Cu electroluminescent phosphor having a halflife of at least about 900 hours. The halflife improvement is made by doping the phosphor with minor amounts of gold and substantially increasing the amount of low intensity milling between firing steps. The improved phosphor has a dramatically longer halflife without sacrificing brightness or exhibiting large shifts in emission color.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
GLOBAL TUNGSTEN & POWDERS CORP.DANVERS, MA130

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Reddy, Vaddi Butchi Sayre, PA 8 36
Reilly, Kenneth T Towanda, PA 22 164

Cited Art

Patent Info (Count) # Cites Year
 
GTE PRODUCTS CORPORATION (2)
4,859,361 Process for producing electroluminescent phosphors of improved brightness 29 1989
5,110,499 Method for increasing the brightness and halflife of electroluminescent phosphors 4 1991

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
GLOBAL TUNGSTEN & POWDERS CORP. (11)
6,682,664 High brightness orange-yellow-emitting electroluminescent phosphor and method of making 6 2002
6,849,297 Encapsulated long life electroluminescent phosphor 2 2002
7,157,845 Single-component yellow-emitting electroluminescent phosphor 0 2004
8,278,816 High CRI electroluminescent lamp 0 2004
7,291,291 Electroluminescent phosphor powder with D50 value of less than 12 .mu.m and method of making 0 2005
7,288,216 Method of making electroluminescent phosphors with small particle sizes and powder with D50 value of no more than 10 micrometers 0 2005
7,014,793 Method of making electroluminescent phosphor using sonochemistry 1 2005
7,749,405 White-emitting phosphor blend and electroluminescent lamp containing same 1 2005
7,452,483 Yellow-emitting phosphor blend for electroluminescent lamps 2 2006
8,298,666 Moisture resistant electroluminescent phosphor with high initial brightness and method of making 0 2007
7,833,437 Moisture-resistant electroluminescent phosphor with high initial brightness and method of making 2 2007
 
LUMIMOVE, INC. (2)
7,001,639 Electroluminescent devices fabricated with encapsulated light emitting polymer particles 11 2002
7,303,827 Light-emitting phosphor particles and electroluminescent devices employing same 0 2006
 
LUMIMOVE, INC., A MISSOURI CORPORATION, DBA CROSSLINK (2)
7,029,763 Light-emitting phosphor particles and electroluminescent devices employing same 0 2002
7,361,413 Electroluminescent device and methods for its production and use 2 2003
 
HOYA CORPORATION (1)
7,897,976 Light-emitting device of field-effect transistor type 0 2003