Method for preparing flexible adhesive electrochromic device capable of being switched between mirror state and transparent state

An electrochromic device and mutual conversion technology, which can be used in instruments, nonlinear optics, optics, etc., can solve the problems of complex preparation, high cost, fragile electrochromic smart windows, etc., and achieve a simple preparation method, easy operation, The effect of low processing cost

Active Publication Date: 2015-05-13

HARBIN INST OF TECH

6 Cites 17 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problems of fragility, complicated preparation and high cost of existing electrochromic smart windows, a...

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Method used

The prepared device of the present invention can transform mutually between transparent state and specular state, and its discoloration principle is to coat one layer of electrolyte containing silver ions between two layers of flexible transparent conductive substrates, by applying additional An electric field causes a redox reaction of the silver ions in the electrolyte. After the silver ions are reduced, they will become simple silver substances. When the simple silver substances are adsorbed on the substrate, the originally transparent substrate will become a s...

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Abstract

The invention relates to a method for preparing an electrochromic device, in particular to a method for preparing a flexible adhesive electrochromic device capable of being switched between a mirror state and a transparent state and aims to solve the problems that the traditional electrochromic smart window is fragile, complex in preparation and higher in cost. The method comprises the following steps: 1, cutting ITO/PET films as required, performing ultrasonic cleaning and blow-drying, and thus obtaining flexible substrates; 2, adding calcium hydride into dimethyl sulfoxide, carrying out heating reflux and distillation at reduced pressure, and thus obtaining dried dimethyl sulfoxide; 3, dissolving silver nitrate, copper chloride and tetrabutyl ammonium bromide into the dried dimethyl sulfoxide to be prepared into an electrolyte, adding polyethylene glycol into the electrolyte, and thus obtaining an electrolyte solution; 4, oppositely placing the conductive surfaces of the two flexible substrates, injecting the electrolyte solution between the two flexible substrates, packaging, and thus obtaining the electrochromic device. The electrochromic device can be switched between the mirror state and the transparent state and is flexible. The method is applied to the field of the electrochromic smart windows.

Application Domain

Non-linear optics

Technology Topic

Calcium hydrideDistillation +12

Image

Examples

Experimental program(10)

Example Embodiment

[0022] Specific implementation mode 1: In this embodiment, the method for preparing a flexible pasteable electrochromic device that can be converted into a mirror state and a transparent state is carried out in the following steps:

[0023] 1. Cut the ITO/PET film as needed, and then ultrasonically clean it in acetone, methanol and ultrapure water in sequence, with a cleaning time of 10-20 minutes, and then dry it with nitrogen to obtain a flexible substrate;

[0024] 2. Add calcium hydride to dimethyl sulfoxide, heat to reflux for 6-8 hours, and distill under reduced pressure under nitrogen to obtain dry dimethyl sulfoxide, which is protected and sealed under nitrogen;

[0025] 3. Dissolve silver nitrate, copper chloride and tetra-n-butylammonium bromide in the dried dimethyl sulfoxide obtained in step 2 to prepare an electrolyte. The concentration of silver nitrate in the electrolyte is 10-100 mM, and copper chloride The concentration of tetrabutylammonium bromide is 5-10mM, the concentration of tetra-n-butylammonium bromide is 100-500mM, and then 10% polyethylene glycol is added to the electrolyte to obtain the electrolyte;

[0026] 4. Place the conductive surfaces of the two flexible substrates obtained in step one against each other, keeping the distance between them at 300-800μm, inject the electrolyte solution obtained in step two between the two flexible substrates, and finally encapsulate the whole. Electrochromic device.

[0027] The ITO/PET film described in step one is a flexible transparent conductive film, purchased from Zhuhai Kaiwei Optoelectronics Technology Co., Ltd.

[0028] The device prepared by the present invention can be converted between the transparent state and the mirror state. The principle of color change is to coat a layer of electrolyte containing silver ions between two flexible transparent conductive substrates, and apply an external electric field to it to make The silver ions in the electrolyte undergo redox reactions. The silver ions will become silver element after being reduced. When the silver element is adsorbed on the substrate, the original transparent substrate will become a silver mirror. At this time, the smart window will become a total reflection state or a mirror state; when the applied voltage is removed, The silver element will be oxidized to silver ions. At this time, the mirror state disappears and the device becomes a fully transparent state. The electrochromic device prepared by the method has a wide dimming range, obvious color changing effect, and can be processed into the required size and shape to be attached to the required place according to the needs, the processing cost is low, the preparation method is simple and the application range is wide.

Example Embodiment

[0029] Specific embodiment two: this embodiment is different from specific embodiment one in that the mass fraction of calcium hydride in the dimethyl sulfoxide described in step two is 0.4% to 1%. Others are the same as the first embodiment.

Example Embodiment

[0030] Specific embodiment three: This embodiment is different from specific embodiment one or two in that the dimethyl sulfoxide obtained after drying under reduced pressure is put into a molecular sieve for sealed storage. Others are the same as the first or second embodiment.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Easy to install
The processing technology is simple

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Reduce processing costs Adaptable Easy to operate Easy to prepare Easy to implement Reflux Physical chemistry Copper chloride Polyethylene glycol Electricity Electrolyte

Method for preparing flexible adhesive electrochromic device capable of being switched between mirror state and transparent state

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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