# US 10,119,073 B2 · Method of processing quantum dot inks

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- Number: US 10,119,073 B2
- Document ID: US10119073B2
- Status: Granted
- Kind: B2
- Application number: 14/460,131
- Filed: 2014-08-14
- Published: 2015-02-12
- Granted: 2018-11-06
- Earliest claimed: 2012-02-15
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Karthik Venkataraman; Abhishek Gupta
- Web page: https://patentgrep.com/patent/US10119073B2

## CPC

- C09K 11/883: {with zinc or cadmium}
- B82Y 20/00: Nanooptics, e.g. quantum optics or photonic crystals
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- G02F 1/01791: {Quantum boxes or quantum dots}
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

A method of storing and transporting quantum dot formulations is provided. The method includes storing and/or transporting the quantum dot formulation under an oxygen-containing atmosphere. A sparged and degassed quantum dot formulation is also described.

## Claims

### Claim 1

A method of processing a quantum dot formulation including oxygen comprising:
providing in a reaction vessel the quantum dot formulation; where the quantum dot formulation comprises quantum dots and a liquid formulation; and the liquid formulation comprises an unpolymerized polymerizable component and an inhibitor compound, which requires oxygen to inhibit polymerization;
displacing the oxygen with an inert gas by sparging the quantum dot formulation with the inert gas; and
degassing the quantum dot formulation in the reaction vessel.

### Claim 2 (depends on 1)

The method of claim 1 wherein the inert gas is introduced into the quantum dot formulation to the extent sufficient to remove substantially all oxygen from the quantum dot formulation.

### Claim 3 (depends on 1)

The method of claim 1 wherein the processed quantum dot formulation includes substantially no oxygen.

### Claim 4 (depends on 1)

The method of claim 1 wherein the inert gas is nitrogen, helium, neon, argon, krypton, xenon or radon.

### Claim 5 (depends on 1)

The method of claim 1 wherein the quantum dot formulation is degassed to the extent sufficient to remove substantially all gas from the quantum dot formulation.

### Claim 6 (depends on 1)

The method of claim 1 wherein the degassed quantum dot formulation includes substantially no gas.

### Claim 7 (depends on 1)

The method of claim 1 further comprising the step of introducing the processed quantum dot formulation into a tube where the quantum dot formulation further comprises an unpolymerized polymerizable component.

### Claim 8 (depends on 1)

The method of claim 1 further comprising the step of introducing the processed quantum dot formulation into a vessel.

### Claim 9 (depends on 7)

The method of claim 7 wherein the tube is a capillary.

### Claim 10 (depends on 7)

The method of claim 7 wherein the tube is hermetically sealed and wherein oxygen is absent or substantially absent from within the tube.

### Claim 11 (depends on 8)

The method of claim 8 wherein the vessel is hermetically sealed and wherein oxygen is absent or substantially absent from within the vessel.

### Claim 12 (depends on 7)

The method of claim 7 further comprising the step of polymerizing the quantum dot formulation within the tube.

### Claim 13

A method of processing a quantum dot formulation including dissolved oxygen comprising:
introducing an inert gas into the quantum dot formulation for a time period sufficient to remove substantially all oxygen from the quantum dot formulation; where the quantum dot formulation is contained in a reaction vessel, and the quantum dot formulation comprises an unpolymerized polymerizable component and an inhibitor compound, which requires oxygen to inhibit polymerization;
subjecting the quantum dot formulation to vacuum while under agitation; and
degassing the quantum dot formulation to remove substantially all dissolved gas from the quantum dot formulation in the reaction vessel.