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High-magnification stretchable electroluminescent device and preparation method thereof

An electroluminescent device, high-rate technology, applied in the fields of electric solid device, semiconductor/solid state device manufacturing, electrical components, etc., can solve the problems of electrolyte leakage, high conductivity, low modulus, etc., to achieve good compatibility and The effect of adhesion, high luminous brightness, and high dielectric constant

Active Publication Date: 2019-05-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrogel has both low modulus and high electrical conductivity, and has high transmittance to visible light, but its disadvantage is that, with the passage of time, the conductivity of hydrogel drops sharply after water volatilization, and zinc sulfide is In a humid environment, it is easily oxidized to zinc sulfate, thereby losing its luminescent properties. Therefore, the electroluminescent body using hydrogel as a flexible transparent electrode has a short service life and unstable performance.
Ionic liquid gel refers to the use of flexible electrodes after the polymer is fully swollen by the electrolyte containing lithium salt. Although there is no problem of moisture volatilization and zinc sulfide oxidation failure, the electrolyte is easy to squeeze and leak during the device packaging process. , affecting the use of the device

Method used

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  • High-magnification stretchable electroluminescent device and preparation method thereof
  • High-magnification stretchable electroluminescent device and preparation method thereof
  • High-magnification stretchable electroluminescent device and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: Dissolve 11.2 parts by mass of mPEGA, 0.0045 parts by mass of V501, and 0.056 parts by mass of small molecule RAFT reagent in 11.2 parts by mass of dioxane, pass nitrogen to remove oxygen for half an hour, and then heat to 70°C for 8 hours;

[0032] Step 2: Add 1.6 parts by mass of n-butyl acrylate, 0.0045 parts by mass of V501, and 1.6 parts by mass of dioxane to the above reactants, and react at 70°C for 16 hours;

[0033] The third step: after drying the solvent of the above-mentioned diblock copolymer obtained on a heating plate, get 1 mass part of copolymer and 0.140 mass part of anhydrous lithium perchlorate, be dissolved in 10 mass parts of ethanol solution for subsequent use;

[0034]Step 4: Dissolve 3 parts by mass of SBAS triblock copolymer in 15 parts by mass of tetrahydrofuran, add 1.5 parts by mass of zinc copper sulfide after fully dissolving, fully stir and ultrasonically disperse, then quickly pour into a polytetrafluoroethylene with an inner diam...

Embodiment 2

[0038] In this example, the RAFT reversible addition-fragmentation chain transfer solution polymerization method is used to prepare diblock copolymers. The preparation method is similar to that in Example 1. The specific lithium-oxygen ratio of the prepared electrode solution is shown in Table 1.

[0039] The doping and film-forming methods of preparing the light-emitting layer in this example are similar to those in Example 1. The mass ratio of zinc-copper sulfide to the matrix SBAS of the prepared light-emitting layer is shown in Table 1 for details.

[0040] Luminance brightness test: Connect the high-magnification stretchable electroluminescent device prepared in this example to TREK TM On the 610E voltage amplifier, use a function generator to output square waves to excite the electroluminescent body, and use a screen brightness meter to record the brightness of the light emitting body under different voltages.

Embodiment 3

[0042] In this example, the RAFT reversible addition-fragmentation chain transfer solution polymerization method is used to prepare diblock copolymers. The preparation method is similar to that in Example 1. The specific lithium-oxygen ratio of the prepared electrode solution is shown in Table 1.

[0043] The doping and film-forming methods of preparing the light-emitting layer in this example are similar to those in Example 1. The mass ratio of zinc-copper sulfide to the matrix SBAS of the prepared light-emitting layer is shown in Table 1 for details.

[0044] Luminance brightness test: Connect the high-magnification stretchable electroluminescent device prepared in this example to TREK TM On the 610E voltage amplifier, use a function generator to output square waves to excite the electroluminescent body, and use a screen brightness meter to record the brightness of the light emitting body under different voltages.

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Abstract

The invention discloses a high-magnification stretchable electroluminescent device and a preparation method thereof. The electroluminescent device of a sandwich layered electroluminescent body takes aZnS / polystyrene-b-poly(n-butyl acrylate)-b-polystyrene triblock copolymer composite material as a light-emitting layer, takes lithium salt / poly(ethylene glycol) methyl ether acrylate-b-poly(n-butyl acrylate) diblock copolymer composite material as a flexible dry transparent electrode, and takes an acrylate dielectric elastomer as a packaging layer. The luminance the high-magnification stretchableelectroluminescent device reaches 450 cd / m<2> under the alternating voltage of 1000 Hz when the electroluminescent device is not stretched, and the electroluminescent device still can maintain 35% ofinitial luminance after the stretchable electroluminescent device is stretched by 5 times, and 85% of luminance can be maintained after 1000 cycles of tests. Therefore, the stability is good, and theperformance of the stretchable electroluminescent body is effectively improved.

Description

technical field [0001] The invention relates to the field of electroluminescence, and relates to a stretchable electroluminescence device and a preparation method thereof. Background technique [0002] Flexible electroluminescence is a deformable light-emitting device that can be stretched, bent, twisted, and folded at a large rate while emitting light spontaneously under an applied alternating electric field. This device can be wrapped on a curved surface and is expected to be widely used in 3D display, biomedical devices and even robotic electronic skin. It is a new generation of lighting and display technology. [0003] The principle of flexible electroluminescence is: an external alternating electric field causes the electrons in the valence band of zinc sulfide copper to be excited and transition, cross the forbidden band and enter the conduction band, and then release energy in the form of fluorescence during the process of returning to the valence band. , so under th...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/52H01L51/56
Inventor 谢沛乐罗英武高翔
Owner ZHEJIANG UNIV
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