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A high-magnification stretchable electroluminescent device and its preparation method

An electroluminescent device, high-magnification technology, applied in the direction of electric solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problems of short service life, affecting the use of devices, high conductivity, etc.

Active Publication Date: 2020-07-07
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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  • A high-magnification stretchable electroluminescent device and its preparation method
  • A high-magnification stretchable electroluminescent device and its preparation method
  • A high-magnification stretchable electroluminescent device and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The first step: 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, deoxidize with nitrogen 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 on the heating plate of the diblock copolymer obtained above, take 1 part by mass of the copolymer and 0.140 parts by mass of anhydrous lithium perchlorate, and dissolve them in 10 parts by mass of ethanol solution for later use;

[0034] Fourth step: 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, stir well and ultrasonically disperse, then quickly pour into PTFE with inner diameter of 10cm The ...

Embodiment 2

[0038] In this embodiment, the RAFT reversible addition fragmentation chain transfer solution polymerization method is used to prepare the diblock copolymer. 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 for preparing the light-emitting layer in this embodiment are similar to those of Example 1. The mass ratio of zinc copper sulfide to the host SBAS of the light-emitting layer prepared is shown in Table 1.

[0040] Luminous brightness test: Connect the high-magnification stretchable electroluminescent device prepared in this example to TREK TM On the 610E voltage amplifier, a function generator is used to output a square wave to excite the electroluminescent body, and the brightness of the luminous body under different voltages is recorded with a screen brightness meter.

Embodiment 3

[0042] In this embodiment, the RAFT reversible addition fragmentation chain transfer solution polymerization method is used to prepare the diblock copolymer. 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 for preparing the light-emitting layer in this embodiment are similar to those of Example 1. The mass ratio of zinc copper sulfide to the host SBAS of the light-emitting layer prepared is shown in Table 1.

[0044] Luminous brightness test: Connect the high-magnification stretchable electroluminescent device prepared in this example to TREK TM On the 610E voltage amplifier, a function generator is used to output a square wave to excite the electroluminescent body, and the brightness of the luminous body under different voltages is recorded with a screen brightness meter.

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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] The flexible electroluminescent body is a deformable light-emitting device that can self-luminesce under an external alternating electric field and can be stretched, bent, twisted and folded at a large magnification. This device can be wrapped on a curved surface, and is expected to be widely used in 3D displays, biomedical devices and even robotic electronic skins. It is a new generation of lighting and display technology. [0003] The principle of flexible electroluminescence light is: the application of an alternating electric field causes the electrons in the zinc sulfide copper valence band to be excited to transition, pass through the forbidden band and enter the conduction band, and then in the process of returning to the valence band, the energy is released in the form of flu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/52H01L51/56
Inventor 谢沛乐罗英武高翔
Owner ZHEJIANG UNIV
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