# US 10,246,633 B2 · Highly stable quantum dot-containing polymer films

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- Number: US 10,246,633 B2
- Document ID: US10246633B2
- Status: Granted
- Kind: B2
- Application number: 15/429,845
- Filed: 2017-02-10
- Published: 2017-08-17
- Granted: 2019-04-02
- Earliest claimed: 2016-02-12
- Assignees: Nanoco Technologies Ltd.
- Applicants: Nanoco Technologies Ltd.
- Inventors: Amilcar Pillay Narrainen; Cong-Duan Vo; Imad Naasani; Abu Mohammad Imroz Ali
- Web page: https://patentgrep.com/patent/US10246633B2

## CPC

- C09K 11/02: Use of particular materials as binders, particle coatings or suspension media therefor
- C08J 5/18: Manufacture of films or sheets
- C09K 11/025: {non-luminescent particle coatings or suspension media}
- C09K 11/08: containing inorganic luminescent materials
- H05B 33/20: characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded
- H10H 20/812: within the light-emitting regions, e.g. having quantum confinement structures
- C08J 2335/02: Characterised by the use of homopolymers or copolymers of esters (C08J2335/06, C08J2335/08 take precedence)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- 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

## Abstract

Highly stable films containing semiconductor nanoparticles (“quantum dots”) are prepared from resins containing a fast-curing inner phase having a high glass transition temperature (Tg) and certain inner phase/outer phase combinations. The resins may comprise an inner phase and outer phase (but may appear to be a single phase due to their homogeneous appearance when viewed using an optical microscope). The method provides a highly scalable and cost-effective procedure for preparing films that are resistant to light, elevated temperatures, moisture, and oxygen.

## Claims

### Claim 1

A film comprising:
a plurality of semiconductor nanoparticles dispersed in a cured inner phase that comprises lauryl methacrylate and trimethylolpropane trimethacrylate; and,
an outer phase that comprises an acrylate-functionalized silica nanoparticle resin.

### Claim 2 (depends on 1)

The film recited in claim 1 additionally comprising:
an oxygen-barrier film.

### Claim 3

A film comprising:
a plurality of semiconductor nanoparticles dispersed in a cured inner phase that comprises lauryl methacrylate and trimethylolpropane trimethacrylate; and,
an outer phase that comprises a monofunctional adhesion-promoting acrylic oligomer and a tricyclodecane dimethanol diacrylate.

### Claim 4 (depends on 3)

The film recited in claim 3 wherein the outer phase comprises substantially equal amounts of the monofunctional adhesion-promoting acrylic oligomer and the tricyclodecane dimethanol diacrylate.

### Claim 5 (depends on 3)

The film recited in claim 3 additionally comprising:
an oxygen-barrier film.

### Claim 6 (depends on 3)

The film recited in claim 3 wherein the semiconductor nanoparticles comprise red-emitting quantum dots.

### Claim 7 (depends on 3)

The film recited in claim 3 wherein the semiconductor nanoparticles comprise red-emitting quantum dots and green-emitting quantum dots.

### Claim 8

A film comprising:
a plurality of semiconductor nanoparticles dispersed in an inner phase that comprises isobornyl acrylate and,
an outer phase that comprises a resin that provides a phase separation from the inner phase.

### Claim 9 (depends on 8)

The film recited in claim 8 wherein the outer phase comprises an acrylate-functionalized silica nanoparticle resin.

### Claim 10 (depends on 8)

The film recited in claim 8 wherein the outer phase comprises a bisphenol A epoxy diacrylate oligomer and 2-hydroxyethyl acrylate.

### Claim 11 (depends on 10)

The film recited in claim 10 wherein the outer phase comprises about 80% bisphenol A epoxy diacrylate oligomer and about 20% 2-hydroxyethyl acrylate.

### Claim 12 (depends on 8)

The film recited in claim 8 wherein the inner phase additionally comprises lauryl acrylate.

### Claim 13 (depends on 8)

The film recited in claim 8 wherein the outer phase comprises an acrylate-functionalized silica nanoparticle resin and the inner phase consists essentially of isobornyl acrylate and semiconductor nanoparticles.

### Claim 14 (depends on 13)

The film recited in claim 13 further comprising about 1% by weight of a photo-initiator.

### Claim 15 (depends on 14)

The film recited in claim 14 wherein the photo-initiator is bis(2,4,6-trimethylbenzoyl)-phenylphosphineoxide.

### Claim 16 (depends on 8)

The film recited in claim 8 wherein the inner phase additionally comprises a stabilizing additive.