Thomas Peters

US Patent:

43904491, Jun 28, 1983

Filed:

Mar 11, 1981

Appl. No.:

6/357013

Inventors:

Thomas E. Peters - Chelmsford MA
James R. McColl - Concord MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

C09K 1144

US Classification:

2523016F

Abstract:

Manganese-arsenic coactivated zinc silicate phosphors comprising a host of substantially stoichiometric zinc silicate and characterized by enhanced brightness and persistence are prepared by a method which includes a two-step firing schedule. The initial pre-fired phosphor powder blend is formulated with an amount of silicic acid less than or equal to the amount stoichiometrically required for the formation of zinc silicate. Any excess zinc oxide remaining in the mixture following the first firing step is removed by addition of ammonium chloride and a second firing step. The resulting phosphors are substantially free of inert zinc oxide and silica which would otherwise contribute to diminished brightness and persistence.

US Patent:

48063894, Feb 21, 1989

Filed:

Mar 2, 1987

Appl. No.:

7/020972

Inventors:

Thomas E. Peters - Chelmsford MA
Roger B. Hunt - Medfield MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

B05D 512

US Classification:

427 67

Abstract:

A method for preventing the hydration/solubilization of the protective oxide coating of a phosphor is described. The method involves coating of the oxide coated phosphor particles with a continuous hydrophobic coating. After the phosphor particles are coated with the continuous hydrophobic coating and the continuous hydrophobic coating cured, they are added to a water-based suspension and subsequently processed into a lamp.

US Patent:

47724170, Sep 20, 1988

Filed:

Dec 21, 1984

Appl. No.:

6/684680

Inventors:

Romano G. Pappalardo - Sudbury MA
Thomas E. Peters - Chelmsford MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

C09K 1171

US Classification:

2523014P

Abstract:

The present invention is directed to luminescent materials having the general formula: Ca(2-v-w-x-y-z) (NSF). sub. v Sr. sub. w Cd. sub. x Sn. sub. y Mn. sub. z P. sub. 2 O. sub. 7 wherein: NSF is the non-stoicheometric factor; 0. ltoreq. v. ltoreq. 01 0. ltoreq. w. ltoreq. 08; 0. ltoreq. x. ltoreq. 05; 0. 01. ltoreq. y. ltoreq. 03; and 0. 05. ltoreq. z. ltoreq. 15.

US Patent:

49509489, Aug 21, 1990

Filed:

Sep 11, 1989

Appl. No.:

7/406884

Inventors:

Thomas E. Peters - Chelmsford MA
Roger B. Hunt - Medfield MA
A. Gary Sigai - Lexington MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

H01J 6144

US Classification:

313486

Abstract:

A new and improved manganese activated zinc silicate phosphor is described. The phosphor has cations consisting essentially of zinc, silicon, manganese, and tungsten. The phosphor has an absolute reflectance less than or equal to 13. 5% at 275 nm, an absolute reflectance equal to or greater than 80% at 350 nm, and a surface area from about 0. 3 m. sup. 2 /gm to about 0. 4 m. sup. 2 gm.

US Patent:

55240160, Jun 4, 1996

Filed:

Jun 9, 1994

Appl. No.:

8/257751

Inventors:

Romano G. Pappalardo - Sudbury MA
Thomas E. Peters - Chelmsford MA
Karen Lee - Salem MA
William J. Miniscalco - Sudbury MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

H01S 317

US Classification:

372 40

Abstract:

A host acting as an optical emitter and a process of making the same for the. sup. about. 1. 3. mu. m to. sup. about. 1. 55. mu. m spectral region utilized in optical communications is disclosed. The host is Cr-activated willemite (Zn. sub. 2 SiO. sub. 4). Efficient band-emission at room temperature, with peak at 1. 42. mu. m, is observed on exiting the material in the near infrared, typically at 730 nm and 829 nm.

US Patent:

49524224, Aug 28, 1990

Filed:

Feb 29, 1988

Appl. No.:

7/161643

Inventors:

Romano G. Pappalardo - Sudbury MA
Thomas E. Peters - Chelmsford MA
Roger B. Hunt - Medfield MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

B05D 506
B05D 512

US Classification:

427 67

Abstract:

A fluorescent lamp containing a Y. sub. 2 O. sub. 3 or Al. sub. 2 O. sub. 3 coating on a layer of yttrium vanadate phosphor and a method of coating the layer of the yttrium vanadate phosphor with a continuous protective coating of Y. sub. 2 O. sub. 3 or Al. sub. 2 O. sub. 3 is described. The method comprises applying a coating of a metal, such as yttrium or aluminum, on the yttrium vanadate phosphor then lehring the metallic coating at about 500. degree. C. to about 625. degree. C. to form a continuous protective coating of Y. sub. 2 O. sub. 3 or Al. sub. 2 O. sub. 3 overlaying the layer of phosphor.

US Patent:

43151906, Feb 9, 1982

Filed:

Dec 15, 1980

Appl. No.:

6/216595

Inventors:

Thomas E. Peters - Chelmsford MA
James R. McColl - Concord MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

C09K 1144

US Classification:

313467

Abstract:

A white bodied green-emitting phosphor having improved persistence and brightness comprises manganese activated zinc silicate incorporating arsenic and an alkali metal wherein the arsenic to zinc atom ratio ranges between about 0. 00005 to about 0. 001 and wherein the alkali metal is present in an amount of between about 0. 5 to about 2. 0 times the concentration of arsenic present in the phosphor.

US Patent:

50394495, Aug 13, 1991

Filed:

Nov 7, 1988

Appl. No.:

7/267880

Inventors:

Thomas E. Peters - Chelmsford MA
Roger B. Hunt - Medfield MA
A. Gary Sigai - Lexington MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

C09K 1159
C09K 1168

US Classification:

2523015

Abstract:

A new and improved method of treating a manganese activated zinc silicate phosphor is described. The method comprises heating a manganese activated zinc silicate phosphor powder having cations consisting essentially of zinc, silicon, manganese, and tungsten and having a 350 nm reflectance less than 80% and a 275 nm reflectance greater than 13. 5% to a temperature of about 1225. degree. C. in air. The phosphor powder is then cooled to room temperature and wet milled in an acid solution. The phosphor powder is then separated from the acid solution washed in water and dried to form a dry phosphor powder having a 350 nm reflectance equal to or greater than 80% and a 275 nm reflectance equal to or less than 13. 5%.