# US 10,312,418 B2 · Semiconductor nanoparticle-based light emitting materials

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- Number: US 10,312,418 B2
- Document ID: US10312418B2
- Status: Granted
- Kind: B2
- Application number: 15/424,556
- Filed: 2017-02-03
- Published: 2017-05-25
- Granted: 2019-06-04
- Earliest claimed: 2011-09-23
- Assignees: Nanoco Technologies Ltd.
- Applicants: Nanoco Technologies Ltd.
- Inventors: Imad Naasani; James Harris; Nigel Pickett
- Web page: https://patentgrep.com/patent/US10312418B2

## CPC

- H10H 20/8513: {having two or more wavelength conversion materials}
- B82Y 20/00: Nanooptics, e.g. quantum optics or photonic crystals
- C09K 11/02: Use of particular materials as binders, particle coatings or suspension media therefor
- C09K 11/565: {with zinc cadmium}
- C09K 11/883: {with zinc or cadmium}
- H10H 20/812: within the light-emitting regions, e.g. having quantum confinement structures
- H10H 20/8511: {characterised by their material, e.g. binder}
- H10H 20/852: Encapsulations
- H10H 20/0361: {of wavelength conversion means}
- H10H 20/0362: {of encapsulations}
- H10H 20/8512: {Wavelength conversion materials}
- 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
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

A light emitting layer including a plurality of light emitting particles embedded within a host matrix material. Each of said light emitting particles includes a population of semiconductor nanoparticles embedded within a polymeric encapsulation medium. A method of fabricating a light emitting layer comprising a plurality of light emitting particles embedded within a host matrix material, each of said light emitting particles comprising a population of semiconductor nanoparticles embedded within a polymeric encapsulation medium. The method comprises providing a dispersion containing said light emitting particles, depositing said dispersion to form a film, and processing said film to produce said light emitting layer.

## Claims

### Claim 1

A method of fabricating a light emitting device incorporating a light emitting layer comprising a plurality of light emitting beads dispersed within a host matrix material, each of said light emitting beads comprising a population of semiconductor nanoparticles embedded within a polymeric encapsulation medium, the method comprising:
providing a dispersion containing said light emitting beads, an initiator, trimethylol propane trimethacrylate (TMPTM) and lauryl methacrylate;
depositing said dispersion on a surface of a diffuser sheet to form a film thereon;
annealing said film to produce said light emitting layer on the surface of the diffuser sheet; and
placing the diffuser sheet over a light source such that the diffuser sheet is between the light source and the light emitting layer.

### Claim 2 (depends on 1)

The method recited in claim 1 wherein said dispersion possesses a viscosity that makes it suitable for deposition by printing or drop casting.

### Claim 3 (depends on 1)

The method recited in claim 1 wherein deposition of said dispersion is effected by printing or drop casting.

### Claim 4 (depends on 1)

The method recited in claim 1, wherein the host matrix material is a polystyrene resin.

### Claim 5 (depends on 1)

The method of claim 1, wherein the dispersion further comprises a polystyrene resin and toluene, and wherein the host matrix material is the polystyrene resin.

### Claim 6 (depends on 1)

The method of claim 1, wherein the host matrix material is a methacrylate.

### Claim 7 (depends on 1)

The method of claim 1, wherein the dispersion further comprises polyisobutylene.

### Claim 8 (depends on 1)

The method of claim 1, wherein annealing comprises heating said film up to a temperature of around 300° C.

### Claim 9 (depends on 1)

The method recited in claim 1 wherein said film has a thickness less than about 250 nm.