Electrochromic photonic-crystal reflective display device and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-2017336692-A1
Application number	US-201615289947-A
Country	US
Kind code	A1
Filing date	Oct 10, 2016
Priority date	May 17, 2016
Publication date	Nov 23, 2017
Grant date	—

Abstract

Disclosed are an electrochromic photonic-crystal reflective display device and a method of manufacturing the same. The electrochromic photonic-crystal reflective display device includes a substrate having lower electrodes, a first solid polymer electrolyte thin film, a block copolymer photonic-crystal thin film, a second solid polymer electrolyte thin film, and upper electrodes. The first solid polymer electrolyte thin film is formed on the top of the substrate, and is made from a mixed solution including a polymer electrolyte and an ionic liquid. The block copolymer photonic-crystal thin film is formed on the top of the first solid polymer electrolyte thin film. The second solid polymer electrolyte thin film is formed on the top of the block copolymer photonic-crystal thin film, and is made from a mixed solution including a polymer electrolyte and an ionic liquid. The upper electrodes are formed on the top of the second solid polymer electrolyte thin film.

First claim

What is claimed is:

1 . An electrochromic photonic-crystal reflective display device, comprising:
a substrate configured to include lower electrodes; a first solid polymer electrolyte thin film formed on a top of the substrate, and made from a mixed solution including a polymer electrolyte and an ionic liquid; a block copolymer photonic-crystal thin film formed on a top of the first solid polymer electrolyte thin film; a second solid polymer electrolyte thin film formed on a top of the block copolymer photonic-crystal thin film, and made from a mixed solution including a polymer electrolyte and an ionic liquid; and upper electrodes formed on a top of the second solid polymer electrolyte thin film.

2 . The electrochromic photonic-crystal reflective display device of claim 1 , wherein color of reflected light is adjusted according voltage applied to the lower electrodes and the upper electrodes.

3 . The electrochromic photonic-crystal reflective display device of claim 1 , wherein electrochromic speed of reflected light is adjusted according to thickness of the polymer electrolyte thin films.

4 . The electrochromic photonic-crystal reflective display device of claim 1 , wherein the substrate is a transparent electrode substrate that is an ITO substrate.

5 . The electrochromic photonic-crystal reflective display device of claim 1 , wherein the polymer electrolyte includes a polymer electrolyte matrix and lithium ions.

6 . The electrochromic photonic-crystal reflective display device of claim 5 , wherein the polymer electrolyte matrix is at least any one of PVDF-TrFE, PS-b-PMMA-b-PS, PVDF-HFP, and PVDF-TrFE-CFE.

7 . The electrochromic photonic-crystal reflective display device of claim 5 , wherein the lithium ions included in the polymer electrolyte are any one of LiTFSI(Bis(trifluoromethane)sulfonimide lithium) and lithium trifluoroacetate.

8 . The electrochromic photonic-crystal reflective display device of claim 1 , wherein, in the polymer electrolyte thin films, a mixing ratio of the ionic liquid is any one of 200 wt %, 300 wt %, 400 wt %, 600 wt %, 800 wt %, and 1200 wt % with respect to a polymer.

9 . The electrochromic photonic-crystal reflective display device of claim 1 , wherein the block copolymer photonic-crystal thin film has a layered structure including a selective swelling layer.

10 . The electrochromic photonic-crystal reflective display device of claim 1 , wherein the selective swelling layer is a QP2VP layer.

11 . The electrochromic photonic-crystal reflective display device of claim 1 , wherein the block copolymer photonic-crystal thin film is a photonic crystal thin film that is formed by subjecting a block copolymer thin film to quaternization and cross-linking.

12 . The electrochromic photonic-crystal reflective display device of claim 1 , wherein the block copolymer photonic-crystal thin film is formed by immersing a solvent-annealed block copolymer thin film in a solution in which bromoethane and dibromobutane are mixed in a predetermined ratio, and generating quaternization and cross-linking.

13 . The electrochromic photonic-crystal reflective display device of claim 12 , wherein bromoethane and dibromobutane are mixed in a ratio at which a sum of bromoethane and dibromobutane is 20 vol % of hexane.

14 . The electrochromic photonic-crystal reflective display device of claim 12 , wherein, in the mixed solution, a mass ratio between dibromobutane and bromoethane is any one of 0, 0.05, and 0.1, wherein 0 means that a dibromobutane content is zero.

15 . A method of manufacturing an electrochromic photonic-crystal reflective display device, the method comprising:
(a) forming a block copolymer photonic-crystal thin film on a top of one substrate; (b) forming a first solid polymer electrolyte thin film on a top of the block copolymer photonic-crystal thin film by spin-coating the top of the block copolymer photonic-crystal thin film with a mixed solution including a polymer electrolyte and an ionic liquid; (c) separating the block copolymer photonic-crystal thin film and the first solid polymer electrolyte thin film, formed on the top of the one substrate, together from the one substrate, and turning over and then attaching the block copolymer photonic-crystal thin film and the first solid polymer electrolyte thin film so that the first solid polymer electrolyte thin film comes into contact with another substrate; (d) forming a second solid polymer electrolyte thin film on a top of the block copolymer photonic-crystal thin film having undergone step (c) by spin-coating the top of the block copolymer photonic-crystal thin film with a mixed solution including a polymer electrolyte and an ionic liquid; and (e) forming upper electrodes on a top of the second solid polymer electrolyte thin film.

16 . A method of manufacturing an electrochromic photonic-crystal reflective display device, the method comprising the steps of:
(a) forming a block copolymer photonic-crystal thin film on a top of one substrate; (b) forming a second solid polymer electrolyte thin film on a top of the block copolymer photonic-crystal thin film by spin-coating the top of the block copolymer photonic-crystal thin film with a mixed solution including a polymer electrolyte and an ionic liquid; (c) forming a first solid polymer electrolyte thin film on a top of another substrate by spin-coating the top of the other substrate with a mixed solution including a polymer electrolyte and an ionic liquid; (d) separating the block copolymer photonic-crystal thin film and the second solid polymer electrolyte thin film, formed on the one substrate, together from the one substrate, and attaching the block copolymer photonic-crystal thin film and the second solid polymer electrolyte thin film so that the block copolymer photonic-crystal thin film comes into contact with the first solid polymer electrolyte thin film formed on the other substrate; and (e) forming upper electrodes on a top of the second solid polymer electrolyte thin film.

17 . The method of claim 15 , wherein the one substrate is a silicon substrate, and the other substrate is a transparent electrode substrate that is an ITO substrate.

18 . The method of claim 16 , wherein the one substrate is a silicon substrate, and the other substrate is a transparent electrode substrate that is an ITO substrate.

19 . The method of claim 15 , wherein step (a) includes the steps of:
(a1) forming a block copolymer thin film on the one substrate through spin coating; (a2) solvent-annealing the formed block copolymer thin film; and (a3) forming the block copolymer photonic-crystal thin film by subjecting the solvent-annealed block copolymer thin film to quaternization and cross-linking.

20 . The method of claim 16 , wherein step (a) includes the steps of:
(a1) forming a block copolymer thin film on the one substrate through spin coating; (a2) solvent-annealing the formed block copolymer thin film; and (a3) forming the block copolymer photonic-crystal thin film by subjecting the solvent-annealed block copolymer thin film to quaternization and cross-linking.

21 . The method of claim 19 , wherein step (a2) is the step of annealing the block copolymer thin film by exposing the block copolymer thin film inside a container, in which chloroform solvent vapor has been saturated, for a predetermined period of time.

22 . The method of claim 20 , wherein step (a2) is the step of annealing the block copolymer th

Assignees

• Industry-Academic Cooperation Foundation Yonsei Univ

Inventors

• Park Cheolmin
• Park Taejoon
• Park Taehyun

Classifications

• G02F1/163

  Operation of electrochromic cells, e.g. electrodeposition cells; Circuit arrangements therefor · CPC title

• G02F2202/32

  Photonic crystals · CPC title

• G02F2001/1519

  Physics · mapped topic

• G02F1/155

  Electrodes · CPC title

• G02F1/1508 Primary

  using a solid electrolyte · CPC title