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KR-20260066383-A - Electroluminescent Acoustic Composition and Electroluminescent Sound Display

KR20260066383AKR 20260066383 AKR20260066383 AKR 20260066383AKR-20260066383-A

Abstract

The present invention relates to an electrophotoacoustic composition and an electrophotoacoustic device. By adding a nonionic surfactant, the dielectric constant can be improved, and at the same time, the electroluminescence performance can be improved. An electrophotoacoustic composition according to an embodiment of the present invention comprises a stretchable silicone rubber, a nonionic surfactant, and copper-doped zinc sulfide (ZnS:Cu).

Inventors

  • 배진우
  • 오승주
  • 최승은

Assignees

  • 한국기술교육대학교 산학협력단

Dates

Publication Date
20260512
Application Date
20241104

Claims (12)

  1. Stretchable silicone rubber, Nonionic surfactants and containing copper-doped zinc sulfide, Electrophotoacoustic composition.
  2. In paragraph 1, The above-mentioned elastic silicone rubber is Ecoflex silicone rubber, Electrophotoacoustic composition.
  3. In paragraph 1, The above-mentioned nonionic surfactant comprises octylphenol ethoxylate, Electrophotoacoustic composition.
  4. In paragraph 1, The content of the above nonionic surfactant is 0.5 to 1.5 parts by weight per 100 parts by weight of the above elastic silicone rubber, Electrophotoacoustic composition.
  5. In paragraph 1, The content of the copper-doped zinc sulfide is 150 to 250 parts by weight per 100 parts by weight of the elastic silicone rubber, Electrophotoacoustic composition.
  6. A step of preparing a mixture by mixing elastic silicone rubber (Ecoflex), a nonionic surfactant (Triton X), and copper-doped zinc sulfide (ZnS:Cu); A step of forming a coating layer by applying the above mixture and A step comprising drying the above coating layer, Method for manufacturing an electrophotoacoustic layer.
  7. In paragraph 6, The content of the nonionic surfactant in the above mixture is 0.5 to 1.5 parts by weight per 100 parts by weight of the elastic silicone rubber, Method for manufacturing an electrophotoacoustic layer.
  8. In paragraph 6 The content of the copper-doped zinc sulfide in the above mixture is 150 to 250 parts by weight per 100 parts by weight of the elastic silicone rubber, Method for manufacturing an electrophotoacoustic layer.
  9. A first electrophotoacoustic layer arranged in one direction; A second electroacoustic layer arranged in a different direction perpendicular to the above one direction and woven with the first electrophotoacoustic layer; A first electrode disposed at one end and the other end of the first electrophotoacoustic layer, respectively, and It includes a second electrode disposed at one end and the other end of the second electrophotoacoustic layer, respectively, and The first and second electrophotoacoustic layers above are those of claim 6, Electrophotoacoustic device.
  10. Step of preparing the first electrode; A step of forming a coating layer by applying an electrophotoacoustic composition onto the first electrode; Step of placing a second electrode on the coating layer above and The method includes the step of curing a structure in which the first electrode, the coating layer, and the second electrode are stacked. The above electrophotoacoustic composition is that of claim 1, Method for manufacturing an electrophotoacoustic device.
  11. In Paragraph 10, In the above electrophotoacoustic composition, the content of the nonionic surfactant is 0.5 to 1.5 parts by weight per 100 parts by weight of the elastic silicone rubber, Method for manufacturing an electrophotoacoustic device.
  12. In paragraph 10 The content of the copper-doped zinc sulfide in the above electrophotoacoustic composition is 150 to 250 parts by weight per 100 parts by weight of the elastic silicone rubber, Method for manufacturing an electrophotoacoustic device.

Description

Electroluminescent Acoustic Composition and Electroluminescent Sound Display The present invention relates to an electrophotoacoustic composition and an electrophotoacoustic device. By adding a nonionic surfactant, the dielectric constant can be improved, and at the same time, the electroluminescence performance can be improved. The present invention is the result of research conducted with funding from the government (Ministry of Science and ICT) and supported by the National Research Foundation of Korea (RS-2024-00348475). Electro-optical devices are attracting attention as a new type of display alongside the recent advancements in wearable electronic devices. While conventional displays have been limited primarily to the function of conveying visual information, there is a growing need for multi-functional displays that combine sound and light-emitting functions to enrich interaction with users. Conventional electroluminescent (EL) devices have attracted much attention as devices with a simple structure, lightweight nature, long lifespan, and excellent deformation capabilities. These devices are primarily based on silver nanowires or highly conductive materials and exhibit high luminescence when voltage is applied, but they have limitations in terms of flexibility. Additionally, while conventional flexible electrodes, such as hydrogel electrodes, offer high flexibility, they have the problem of unstable performance due to sensitivity to changes in humidity and temperature. Accordingly, research has been conducted to develop electrophotoacoustic devices that simultaneously satisfy flexibility and luminescence performance. However, conventional electrophotoacoustic devices have found it difficult to possess both luminescence performance and flexibility at the same time. FIG. 1 is a flowchart of a method for manufacturing an electrophotoacoustic layer according to an embodiment of the present invention. FIG. 2 is a conceptual diagram of a method for manufacturing an electrophotoacoustic device according to an embodiment of the present invention. Figure 3 shows the appearance of an electrophotoacoustic device according to an embodiment of the present invention before and after applying voltage. Figure 4 shows the dielectric constant measurement results of the example and comparative example. Figure 5 shows the measurement result of the leakage current of the manufacturing example. Figure 6 shows the stress-strain analysis results of the examples and comparative examples. Figure 7 shows the luminance measurement results according to the voltage of the manufacturing example. Figure 8 shows the measurement results of the maximum emission wavelength according to the voltage of Preparation Example 1. Figure 9 shows the analysis results of the luminescence color according to the voltage of Preparation Example 1. Figure 10 shows the luminance measurement results according to the frequency of the manufacturing example. Figure 11 is the measurement result of the maximum emission wavelength according to frequency of Preparation Example 1. Figure 12 is the result of analyzing the luminescence color according to frequency of Preparation Example 1. Figure 13 is a photograph showing the luminescence phenomenon of Manufacturing Example 1 according to frequency. FIG. 14 is a photograph showing the phenomenon of light emission after applying current to the prepared Example 1 after stretching it in one direction by 0 to 200%. Figure 15 shows the results of measuring the sound pressure level (SPL) according to the voltage of the manufacturing example. Figure 16 shows the results of measuring the sound pressure level (SPL) according to the frequency of the manufacturing example. Figure 17 shows the results of measuring the negative pressure level (SPL) according to the elongation of Preparation Example 1. Hereinafter, preferred embodiments of the present invention are described as follows with reference to the attached drawings. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. Furthermore, embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. An electrophotoacoustic composition according to an embodiment of the present invention comprises a stretchable silicone rubber, a nonionic surfactant, and copper-doped zinc sulfide (ZnS:Cu). The above-mentioned elastic silicone rubber is used as the main matrix of the electrophotoacoustic layer and provides elasticity to the electrophotoacoustic device. The above-mentioned elastic silicone rubber has stable physical properties even at high and low temperatures and exhibits excellent insulation and chemical resistance. The above-mentioned elastic silicone rubber may be Ecoflex silicone rubber, PDMS-based silicone rubber, silicone gel, etc., and preferably may be Ecoflex silicone rubber. In on