A kind of preparation method of white electrochromic device

Abstract

The invention discloses a preparation method of a white electrochromic device; it comprises a polyacrylamide transparent conductive material, an electrochromic device structure, and an electroluminescent device structure; it is prepared on one side of the polyacrylamide conductive layer material by a printing and spraying process The electrochromic device structure is produced, and the electroluminescent device structure is prepared on the other side; the electrochromic device structure can realize the conversion of the absorption spectrum from transparent to 530‑660nm band under the drive of DC voltage, and the electroluminescent device structure can be converted under AC voltage Under the driving, the emission spectrum can be realized as 500-520nm blue-green light; by adjusting the light-emitting spectrum and color-changing wavelength, the mutual conversion between the light-emitting device from blue-green light to white light can be realized.

Description

technical field [0001] The invention relates to a preparation method of a white photochromic device, which belongs to the technical field of electronic information. Background technique [0002] Existing electroluminescent colors are mainly achieved by conversion of organic fluorescent dyes or pigments, which are usually printed with ink or mixed with plastic particles to make a film. After adding organic fluorescent dyes or pigments to them, the body color is exactly the same when it is luminous or not. . White electroluminescent devices are also formed by fluorescent dyes or pigments, such as: orange, pink, and yellow luminescent materials, which are converted and combined with blue or blue-green electroluminescent materials to achieve white light emission. Fluorescent dyes or pigments are mainly organic or inorganic Materials, such as: YAG fluorescent materials, rhodamine organic dyes, etc. Their disadvantages are that organic materials are stable and have poor weather ...

AI Technical Summary

Problems solved by technology

Their disadvantages are that organic materials are stable and have poor weather resistance, and inorganic YAG fluorescent materials have poor transparency and high cost

The existing technology reduces the color, lifespan and luminous efficiency of electroluminescent devices. Because dyes are not resistant to ultraviolet rays, white electroluminescent devices cannot be used outdoors.

[0003] Chinese patent CN 1913194 A discloses a white electroluminescent device and its preparation method. The white electroluminescent device includes a substrate, a first electrode, a hole transport unit with a predetermined thickness of the transport unit, and a blue layer with a predetermined thickness. A blue light-emitting layer, a green light-emitting layer with a predetermined thickness of the green layer, a red light-emitting layer and a second electrode; the white light-emitting device of the invention has low luminous efficiency and is difficult to realize industrial application

The white light-emitting device prepared by the invention adopts the method of fluorescent dye conversion to realize white light conversion, which leads to low device efficiency and greatly limits its application field

Images