# US 8,541,936 B2 · Composite layer containing a layer of phosphors and related electroluminescent device

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- Number: US 8,541,936 B2
- Document ID: US8541936B2
- Status: Granted
- Kind: B2
- Application number: 13/702,565
- Filed: 2011-07-04
- Published: 2013-04-04
- Granted: 2013-09-24
- Earliest claimed: 2010-07-07
- Assignees: Saes Getters S.P.A.
- Applicants: Antonio Bonucci; Alessio Corazza; Paolo Vacca
- Inventors: Antonio Bonucci; Alessio Corazza; Paolo Vacca
- Web page: https://patentgrep.com/patent/US8541936B2

## CPC

- C09K 11/7792: {Aluminates}
- B32B 9/048: {made of particles}
- C09K 11/025: {non-luminescent particle coatings or suspension media}
- C09K 11/7734: {Aluminates}
- C09K 11/7787: {Oxides (C09K11/7785 takes precedence)}
- H01J 11/42: Fluorescent layers
- H05B 35/00: Electric light sources using a combination of different types of light generation
- H10H 20/84: Coatings, e.g. passivation layers or antireflective coatings
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- Y10S 977/773: Nanoparticle, i.e. structure having three dimensions of 100 nm or less
- Y10S 977/783: Organic host/matrix, e.g. lipid
- Y10T 428/256: Heavy metal or aluminum or compound thereof
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Solutions to improve the properties of the phosphors and electroluminescent devices are described, using phosphors in combination with zeolites for converting UV or Blue radiation into visible radiation.

## Claims

### Claim 1

A composite layer for conversion of UV or blue radiation into a visible radiation, containing a layer of phosphors combined with zeolites of nanometric size, wherein at least 95% of the nanometric zeolites have dimensions between 60 and 400 nm.

### Claim 2 (depends on 1)

The composite layer according to claim 1 wherein said nanometric zeolites are dispersed in a transparent polymeric matrix.

### Claim 3 (depends on 1)

The composite layer according to claim 1 wherein said nanometric zeolites are uniformly dispersed with the phosphors.

### Claim 4 (depends on 3)

The composite layer according to claim 3 wherein at least 95% of said nanometric zeolites have dimensions comprised between 80 and 150 nm.

### Claim 5 (depends on 4)

The composite layer according to claim 4 wherein at least 95% of said nanometric zeolites have dimensions comprised between 90 and 110 nm.

### Claim 6 (depends on 1)

The composite layer according to claim 1 wherein said nanometric zeolites form a covering layer positioned over said layer of phosphors.

### Claim 7 (depends on 6)

The composite layer according to claim 6 wherein at least 95% of said nanometric zeolites have dimensions comprised between 250 and 350 nm.

### Claim 8 (depends on 7)

The composite layer according to claim 7 wherein at least 95% of said nanometric zeolites have dimensions comprised between 280 and 320 nm.

### Claim 9 (depends on 1)

The composite layer according to claim 1 wherein said nanometric zeolites form an intermediate layer positioned between said layer of phosphors and a transparent substrate.

### Claim 10 (depends on 9)

The composite layer according to claim 9 wherein at least 95% of said nanometric zeolites have dimensions comprised between 60 and 100 nm.

### Claim 11 (depends on 10)

The composite layer according to claim 10 wherein at least 95% of said nanometric zeolites have dimensions comprised between 70 and 90 nm.

### Claim 12

An electroluminescent device comprising a composite layer for conversion of UV or blue radiation into a visible radiation, containing a layer of phosphors combined with zeolites of nanometric size wherein at least 95% of the nanometric zeolites have dimensions between 60 and 400 nm.

### Claim 13 (depends on 12)

The electroluminescent device according to claim 12 wherein said nanometric zeolites form a covering layer positioned over said layer of phosphors, said covering layer facing the inside of the device.

### Claim 14 (depends on 12)

The electroluminescent device according to claim 12 wherein said nanometric zeolites form an intermediate layer positioned between said layer of phosphors and a transparent substrate.

### Claim 15 (depends on 12)

The electroluminescent device according to claim 12 wherein said electroluminescent device is a plasma display.

### Claim 16 (depends on 12)

The electroluminescent device according to claim 12 wherein said electroluminescent device is a fluorescent lamp.

### Claim 17 (depends on 12)

The electroluminescent device according to claim 12 wherein said electroluminescent device is a discharge lamp.

### Claim 18 (depends on 12)

The electroluminescent device according to claim 12 wherein said electroluminescent device is a phosphor white LED.