# US 11,307,474 B2 · Electrochromic nanoparticle

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- Number: US 11,307,474 B2
- Document ID: US11307474B2
- Status: Granted
- Kind: B2
- Application number: 16/077,197
- Filed: 2016-03-16
- Published: 2020-03-19
- Granted: 2022-04-19
- Earliest claimed: 2016-03-07
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Sangmo Koo
- Web page: https://patentgrep.com/patent/US11307474B2

## CPC

- C09K 9/00: Tenebrescent materials, i.e. materials for which the range of wavelengths for energy absorption is changed as a result of excitation by some form of energy
- G02F 1/1525: {characterised by a particular ion transporting layer, e.g. electrolyte}
- C09K 9/02: Organic tenebrescent materials
- G02F 1/1503: caused by oxidation-reduction reactions in organic liquid solutions, e.g. viologen solutions
- G02F 1/1514: characterised by the electrochromic material, e.g. by the electrodeposited material
- G02F 1/1524: Transition metal compounds
- B82Y 20/00: Nanooptics, e.g. quantum optics or photonic crystals
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- 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
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES

## Abstract

The present invention relates to an electrochromic nanoparticle having a core-shell structure. The invention provides an electrochromic nanoparticle comprising: a core formed of a first electrochromic material; and a shell encompassing the core and formed of a second electrochromic material, wherein the first electrochromic material is formed of at least one type of transition metal oxide.

## Claims

### Claim 1

An electrochromic nanoparticle comprising:
a core formed of a first electrochromic material;
a shell encompassing the core and formed of a second electrochromic material; and
an adsorption layer positioned between the core and the shell and formed so as to enhance adsorption force of the core and the shell, the adsorption layer having a thickness less than a thickness of the core,
wherein the first electrochromic material is formed of at least one transition metal oxide, and
wherein the absorption layer is formed of TiO2.

### Claim 2 (depends on 1)

The electrochromic nanoparticle of claim 1, wherein when a voltage equal to or more than a reference value is applied to the nanoparticle, the nanoparticle is converted from a first state to a second state, and when a reverse voltage equal to or more than the reference value is applied to the nanoparticle in the second state, the nanoparticle is converted from the second state to the first state, and the nanoparticle has different light transmittances in the first and second states.

### Claim 3 (depends on 2)

The electrochromic nanoparticle of claim 2, wherein when the nanoparticle is converted from the first state to the second state, the light transmittance at each wavelength within a wavelength band of 400 nm to 800 nm is decreased to 0.06 times to 0.6 times.

### Claim 4 (depends on 3)

The electrochromic nanoparticle of claim 3, wherein the light transmittance of the nanoparticle in the first state at each wavelength within a wavelength band of 400 nm to 800 nm is 15% to 90%, and the light transmittance of the nanoparticle in the second state at each wavelength within a wavelength band of 400 nm to 800 nm is 5% to 30%.

### Claim 5 (depends on 2)

The electrochromic nanoparticle of claim 2, wherein when the nanoparticle is converted from the first state to the second state, the light transmittance at each wavelength within a wavelength band of 400 nm to 500 nm is decreased to 0.65 times to 0.80 times, and the light transmittance at each wavelength within a wavelength band of 500 nm to 800 nm is decreased to 0.20 times to 0.80 times.

### Claim 6 (depends on 5)

The electrochromic nanoparticle of claim 5, wherein the light transmittance of the nanoparticle in the first state at each wavelength is 15% to 60% within a wavelength band of 400 nm to 500 nm and 60% to 80% within a wavelength band of 500 nm to 800 nm, and the light transmittance of the nanoparticle in the second state at each wavelength is 10% to 50% within a wavelength band of 400 nm to 500 nm and 17% to 50% within a wavelength band of 500 nm to 800 nm.

### Claim 7 (depends on 1)

The electrochromic nanoparticle of claim 1, wherein the first electrochromic material is formed of at least one of tungsten oxide, molybdenum oxide, tantalum oxide, niobium oxide, vanadium oxide, iron oxide, manganese oxide, chromium oxide, cobalt oxide, rhodium oxide, iridium oxide, and nickel oxide.

### Claim 8 (depends on 1)

The electrochromic nanoparticle of claim 1, wherein the second electrochromic material is any one of compounds represented by the following Chemical Formula 1 to 7,
in Chemical Formula 1 to 7, X− is any one of BF4−, ClO4−, CF3SO3−, F−, Cl−, Br−, and I−, and
in Chemical Formula 7, R1 and R2 are any one of a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, an isopentyl group, and a benzyl group.

### Claim 9 (depends on 1)

The electrochromic nanoparticle of claim 1, wherein the second electrochromic material is any one of polythiophene, poly(3-methylthiophene), polypyrrole, poly(3-methylketopyrrole), poly(3,4-dimethylpyrrole), poly(N-methylpyrrole), polyaniline, poly(2-methylaniline), and poly(3-methylaniline).

### Claim 10 (depends on 1)

The electrochromic nanoparticle of claim 1, wherein the second electrochromic material is formed of at least one transition metal oxide, and the first electrochromic material and the second electrochromic material are formed of different transition metal oxides.

### Claim 11 (depends on 1)

The electrochromic nanoparticle of claim 1, wherein the transition metal oxide of the first electrochromic material of the core is different from the TiO2 of the adsorption layer, and
wherein the TiO2 of the adsorption layer has a weak electrochromic characteristic and does not affect an adsorption spectrum of the electrochromic nanoparticle.