# US 4,398,119 A · Coated phosphor particles, method, and cathode ray tube screen

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- Number: US 4,398,119 A
- Document ID: US4398119A
- Status: Granted
- Kind: A
- Application number: 06/188,634
- Filed: 1980-09-19
- Granted: 1983-08-09
- Earliest claimed: 1980-09-19
- Assignees: GTE Products Corporation
- Inventors: Robert E. Dodds; David J. Harrigan
- Web page: https://patentgrep.com/patent/US4398119A

## CPC

- C09K 11/025: {non-luminescent particle coatings or suspension media}
- Y10T 428/2991: Coated
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Red cathode ray phosphors are coated with a vapor deposited layer of cadmium selenide in order to achieve controlled color shifts in the light output of the phosphors. Such coated phosphors are especially suited for color television and monitor applications.

## Claims

### Claim 1

A composite article of manufacture comprising a phosphor particle and a continuous coating on the surface of the particle, characterized in that said coating comprises a vapor deposited layer of a color modifying material having a substantially uniform thickness.

### Claim 2 (depends on 1)

The article of claim 1 wherein the phosphor particle is a red-emitting cathode ray phosphor selected from the group consisting of europium-activated yttrium oxide, europium-activated yttrium oxysulfide, and europium-activated yttrium orthovanadate.

### Claim 3 (depends on 1)

The article of claim 1 wherein the color modifying material is a red pigment.

### Claim 4 (depends on 3)

The article of claim 3 wherein the color modifying material is cadmium sulfoselenide.

### Claim 5 (depends on 1)

The article of claim 1 wherein the thickness of the layer is within the range of from about 2 to 10,000 Angstroms.

### Claim 6

An article of manufacture comprising a cathode ray tube faceplate and an array of elemental areas on the faceplate, the areas comprising coated particles of a cathode ray phosphor distributed in a matrix of a photoresist, characterized in that the particle coating comprises a vapor deposited layer of a color modifying material.

### Claim 7 (depends on 6)

The article of claim 6 wherein the phosphor particle is a red-emitting cathode ray phosphor selected from the group consisting of europium-activated yttrium oxide, europium-activated yttrium oxysulfide, and europium-activated yttrium orthovanadate.

### Claim 8 (depends on 6)

The article of claim 6 wherein the color modifying material is a red pigment.

### Claim 9 (depends on 6)

The article of claim 6 wherein the color modifying material is cadmium sulfoselenide.

### Claim 10 (depends on 6)

The article of claim 6 wherein the thickness of the layer is within the range of from about 2 to 10,000 Angstroms.