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Electrochromic device with single substrate structure

A technology of electrochromic devices and electrochromic layers, applied in the direction of color-changing fluorescent materials, instruments, chemical instruments and methods, can solve the problems of pollution, leakage, high cost, etc., and achieve simple production process, high color-changing efficiency, and fast response time short effect

Active Publication Date: 2012-12-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] This traditional "sandwich" structure, because the whole device is transparent, can be used on glass windows to adjust and control energy and protect privacy through discoloration, and can also be used for displays, but due to the use of two transparent conductive layers, the cost is high, Not conducive to competition with other display devices for commercial applications
On the other hand, electrochromic devices with this structure generally use liquid electrolytes, which have better color rendering performance (such as response time, color changing efficiency, etc.), but liquid electrolytes have solvent volatilization and pollution problems caused by leakage. Packaging and other issues
If a solid electrolyte is used, these problems can be solved, but at the same time, since the solid electrolyte cannot fully contact the counter electrode like a liquid electrolyte, the electron transfer resistance at the counter electrode of the device will increase significantly, thereby affecting the discoloration performance of the device , reducing the response speed and efficiency of discoloration

Method used

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  • Electrochromic device with single substrate structure

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Effect test

Embodiment 1

[0015] The device uses conductive glass as the conductive substrate, and sequentially prepares nano-titanium dioxide layer, insulating reflection layer, and counter electrode layer by screen printing from bottom to top, and absorbs organic electrochromic materials on the nano-titanium dioxide layer as the electrochromic layer. The filling method fills the electrolyte as an ion-conducting layer. The nanometer titanium dioxide particle is 20nm, and the thickness of the titanium dioxide layer is about 5 μm. The insulating reflective layer is a nano-zirconia film with a thickness of about 5 μm. The electrolyte is a methoxypropionitrile solution of lithium perchlorate, and the counter electrode layer is a conductive film made of graphite and carbon black. In order to prevent the liquid electrolyte from leaking and volatilizing, the device is packaged with hot melt adhesive and a piece of ordinary glass. The test result of applying 1V voltage shows that the coloring time is 2.1s a...

Embodiment 2

[0017] The device uses conductive glass as the conductive substrate, and sequentially prepares nano-titanium dioxide layer, insulating reflection layer, and counter electrode layer by screen printing from bottom to top, and absorbs organic electrochromic materials on the nano-titanium dioxide layer as the electrochromic layer. The filling method fills the electrolyte as an ion-conducting layer. The nanometer titanium dioxide particle is 20nm, and the thickness of the titanium dioxide layer is about 8 μm. The insulating reflective layer is a nano-titanium dioxide film with a thickness of about 5 μm. The electrolyte is a solution of lithium trifluoromethanesulfonate in methoxypropionitrile. The counter electrode layer is a conductive film made of graphite and carbon black. In order to prevent the liquid electrolyte from leaking and volatilizing, the device is packaged with hot melt adhesive and a piece of ordinary glass. The test result of applying 1V voltage shows that the c...

Embodiment 3

[0019] The device uses conductive glass as the conductive substrate, and sequentially prepares a nano-titanium dioxide layer, an insulating reflection layer, and a counter electrode layer by screen printing from bottom to top, and adsorbs organic electrochromic materials on the nano-titanium dioxide layer as the electrochromic layer. The coating method fills the electrolyte as an ion-conducting layer. The nano titanium dioxide particles are 25nm, and the thickness of the titanium dioxide layer is about 8 μm. The insulating reflective layer is a zirconia film with a thickness of about 8 μm. The electrolyte is lithium perchlorate in acetonitrile. The counter electrode layer is a conductive film made of graphite and carbon black. In order to prevent the liquid electrolyte from leaking and volatilizing, the device is packaged with hot melt adhesive and a piece of ordinary glass. The test result of applying 1V voltage shows that the coloring time is 2.7s and the fading time is 6...

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Abstract

The invention discloses an electrochromic device. The device comprises a conductive substrate (1), and an electrochromic layer (2), an ionic conducting layer (3), an insulating reflection layer (4) and a counter electrode layer (5) which are deposited on the substrate in turn from bottom to top. Due to various tests, bias voltage which is needed to be applied to the electrochromic device with a single substrate structure is low, so that energy is saved, and the device is high in electrochromic property, bright in color, high in response speed and long in service life. The electrochromic device with the structure is simple in production process and low in cost, can be applied to monochromatic display devices such as subtitle billboards, traffic lights and the like, can obtain different color changes through different electrochromic materials, and is expected to be applied to high-contrast unbiased-view displays. The structure and the preparation technology have great development potential and good application prospects.

Description

technical field [0001] The invention relates to an electrochromic device, which belongs to the field of display devices. Background technique [0002] Electrochromism can be defined as a property or phenomenon in which a material changes color by absorbing or reflecting light when a voltage is applied. People began to pay attention to this phenomenon in the 1950s and 1960s. In the following decades, electrochromic materials have been widely studied. There are many kinds of electrochromic materials, which are generally divided into inorganic electrochromic materials and organic electrochromic materials. Electromechanical materials. Inorganic electrochromic materials generally have good chemical stability and are easy to achieve full curing. Among them, the most in-depth and detailed material is WO 3 , The practical prospect is good, but the inorganic electrochromic material has the disadvantages of long response time and single color that can be changed. However, there are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/153G02F1/155C09K9/02
Inventor 韩宏伟胡敏刘广辉李雄汪恒荣耀光库治良徐觅向鹏舒婷周子明刘林峰杨迎
Owner HUAZHONG UNIV OF SCI & TECH
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