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CN-122028244-A - Dynamic color-changing electroluminescent fiber device and preparation method thereof

CN122028244ACN 122028244 ACN122028244 ACN 122028244ACN-122028244-A

Abstract

The invention belongs to the technical field of electroluminescent fiber devices, and particularly relates to a dynamic color-changing electroluminescent fiber device and a preparation method thereof. The three-color electroluminescent fiber device comprises three-color electroluminescent fibers and a drive control circuit, wherein the three-color electroluminescent fibers comprise inner-level and outer-level conductive fibers, three luminous functional layers and a shared electrode, the drive control circuit comprises a lithium battery, an FPGA, an isolated inversion boosting module and the like, the lithium battery supplies power to the whole circuit, the circuit system provides four independent output ports to be connected with the four electrodes, the three luminous functional layers are of a stacked structure formed by luminous active slurries of three colors of red, green and blue through a gradual coating method, and the drive circuit independently controls the three active luminous layers of the three colors to realize dynamic color-changing luminescence without crosstalk among all luminous colors, and can realize real-time regulation and full-color-domain luminescence. The invention has the advantages of wide color gamut, high stability, good repeatability and low cost, avoids color crosstalk between luminescent layers, and is suitable for industrial production.

Inventors

  • CHEN PEINING
  • Cheng Shuaici
  • WU JINGXIA
  • LIU PEIYU
  • PENG HUISHENG

Assignees

  • 复旦大学

Dates

Publication Date
20260512
Application Date
20260113

Claims (10)

  1. 1. The dynamic color-changing electroluminescent fiber device is characterized by comprising three-color electroluminescent fibers and a drive control circuit, wherein: The three-color electroluminescent fiber comprises an inner-level conductive fiber, an outer-level conductive fiber, three luminous functional layers and a shared electrode, wherein at least two luminous functional layers are coated and stacked in sequence, the shared electrode is flat and is arranged between the stacked luminous functional layers, and is specifically adhered to the inner layer and the middle two luminous functional layers in a mode of coating a transparent conductive layer and a winding fiber electrode; The driving control circuit is composed of a lithium battery module, a voltage reduction and stabilization module, an FPGA module, a display/key module, a voltage regulation module and an isolation inversion boosting module, wherein the lithium battery is used as a main power supply, the anode and the cathode of the lithium battery supply power for the whole circuit through a power supply circuit, the output of the lithium battery is subjected to voltage conversion and stabilization treatment through the voltage reduction and stabilization module to provide stable working voltage for a later-stage circuit, the input of the voltage reduction and stabilization module is connected with the power supply module, the output of the voltage reduction and stabilization module is connected with a core control unit of a circuit system, the core control unit comprises the FPGA and a display/key man-machine interaction interface, the FPGA is responsible for logic control and signal processing of the whole system, the display/key module provides a user operation interface, the FPGA control module outputs multiple control signals, the signals are subjected to voltage regulation and matching through the respective voltage regulation module, the signals after voltage regulation are divided into two paths, one part of the signals is connected to the isolation inversion boosting circuit to realize electric isolation and voltage boosting, the other part of the signals are connected to the non-isolation boosting circuit to perform direct voltage boosting conversion, and the circuit system finally provides four independent output ports to be connected with luminescent color-changing fibers after the power conversion, wherein the four output ports are sequentially connected from inside to four electrodes or outside.
  2. 2. The dynamic color-changing electroluminescent fiber device according to claim 1, wherein the light-emitting functional layer is selected from blue, red, green, orange, pink, blue, or a composite electroluminescent material having a red light conversion layer doped therein.
  3. 3. The dynamic color-changing electroluminescent fiber device according to claim 1, wherein in the driving control circuit, the lithium battery module adopts 12V voltage, the lithium battery module is stabilized at 3.3V through the voltage-reducing and stabilizing module, the voltage debugging range is-100V-200V, and the frequency range is 0Hz-10kHz.
  4. 4. The method for preparing a dynamic color-changing electroluminescent fiber device according to claim 1, wherein the preparation of the trichromatic electroluminescent fiber comprises the following specific steps: Step one, preparing electroluminescent active slurries with different colors, namely respectively adding the selected electroluminescent materials with different types into a polymer medium, and uniformly dispersing the electroluminescent materials in the polymer medium through sufficient physical and mechanical stirring to obtain the electroluminescent active slurries with different colors; Step two, preparing monochromatic electroluminescent fiber, namely uniformly loading electroluminescent active slurry with a certain color on the surface of the conductive fiber by a dip-coating method, drying, coating a transparent conductive layer on the surface of the electroluminescent active layer, drying, winding a fiber electrode to form a first shared electrode, and obtaining the monochromatic electroluminescent fiber; Step three, preparing a bicolor electroluminescent fiber, namely uniformly loading a second color electroluminescent active slurry on the surface of the monochromatic electroluminescent fiber prepared in the step two by a dip-coating method, drying, coating a transparent conductive layer on the surface of the second luminescent active layer, drying, winding a fiber electrode to form a second shared electrode, and obtaining the bicolor electroluminescent fiber; And step four, preparing three-color electroluminescent fibers, namely uniformly loading the electroluminescent active slurry with the third color on the surface of the two-color electroluminescent fibers prepared in the step three through a dip-coating method, drying, coating a transparent conductive layer on the surface of the third luminescent active layer, drying, winding fiber electrodes to form external electrodes, and obtaining the three-color electroluminescent fibers.
  5. 5. The method of manufacturing according to claim 4, wherein: The electroluminescent material is doped zinc sulfide, the doping elements are selected from Mn, cu, cl and Al, the luminescent color is determined by the doping elements, the particle size of the luminescent material is 5-30 mu m, and the polymer matrix is selected from polyvinyl alcohol, polyurethane, polyacrylate, polyamide, fluororubber and nitrile rubber.
  6. 6. The method of manufacturing according to claim 4, wherein: the dip-coating speed of the electroluminescent active slurry on the fiber electrode is 1-10 m/s, the drying temperature is 100-200 ℃, and the thickness of the electroluminescent active layer is 30-80 mu m; The dip-coating speed of the transparent conductive layer is 1-10 m/s, the drying temperature is 120-180 ℃, and the thickness of the transparent conductive film layer is 0.05-0.1 mu m; The diameter of the conductive fiber is 20-80 mu m, the winding pitch is 100-1000 mu m, and the winding linear speed is 1-10 m/min; the transparent conductive layer material is selected from indium tin oxide, silver nanowires and poly (3, 4-ethylenedioxythiophene) -polystyrene sulfonic acid; the conductive fiber is selected from carbon-based conductive fiber, conductive polymer chemical fiber, metal plating chemical fiber and metal wire.
  7. 7. The preparation method of the red luminescent active slurry according to claim 6, wherein the red luminescent active slurry is obtained by mechanically stirring and blending a red light conversion material, cu doped zinc sulfide luminescent powder and a polymer, wherein the mechanical stirring is carried out for 10-60min at a stirring speed of 500-1000rpm, the red light conversion material accounts for 50-70 wt% of the doped zinc sulfide luminescent powder, and the polymer medium accounts for 5-20wt% of the luminescent active slurry.
  8. 8. The preparation method according to claim 7, wherein the red light conversion material is a rare earth doped fluorescent material, specifically aluminate, silicate or nitride, the activating ion is rare earth ion or transition metal ion, and the light conversion effect is realized by emitting narrow-band spectrum through 4f-4f or 5d-4f electron transition of the rare earth ion.
  9. 9. The method according to claim 7, wherein the red light converting material has a particle size of 10 to 30 μm, an excitation dominant wavelength of 440 to 480nm, an emission dominant wavelength of 600 to 650 nm, and an emission half-width of 80 to 110 nm.
  10. 10. The preparation method of the blue light, green light and orange light luminous active slurry is characterized in that zinc sulfide luminous particles doped with Cu elements, cl elements and Mn elements respectively are added into a polymer matrix and stirred and mixed, the proportion of the blue light zinc sulfide particles in the luminous active slurry is 50-90wt%, the proportion of the green light zinc sulfide particles in the luminous active slurry is 50-90wt%, the proportion of the orange light zinc sulfide particles in the luminous active slurry is 40-70wt%, and the stirring time of the luminous particles in the polymer matrix is 1-2h.

Description

Dynamic color-changing electroluminescent fiber device and preparation method thereof Technical Field The invention belongs to the technical field of electroluminescent fiber devices, and particularly relates to a dynamic color-changing electroluminescent fiber device and a preparation method thereof. Background With the development needs of flexibility, light weight and intelligence of electronic products, development of wearable flexible display electronic devices suitable for the electronic products is needed. The conventional display device cannot effectively meet the above-mentioned requirements due to its characteristics of rigidity and bulkiness. The fiber plays an important role in various technologies from clothing to optical communication, and the alternating current electroluminescent fiber with the display function has the advantages of flexibility, capability of bending and twisting, adaptability to narrow spaces, high flexibility, capability of being woven into breathable fabrics and the like, and shows great commercialization potential. Based on the existing mature alternating current electroluminescent fiber preparation technology, the alternating current electroluminescent fiber emitting light with different wavelengths can be obtained by regulating and controlling the element types doped by the active luminescent material. For example, cu-doped zinc sulfide can emit blue or blue-green light and Mn-doped zinc sulfide can emit orange-red light. In addition, through adding a light conversion layer, the light emitted by the zinc sulfide can be converted into other colors of alternating current electroluminescent fibers through fluorescence, for example, a red fluorescent substance is coated on the surface of the Cu-doped zinc sulfide active functional layer, and red light is emitted after blue light emitted by the zinc sulfide is absorbed, so that the red light alternating current electroluminescent fibers can be prepared. However, the conventional luminescent fiber mainly relies on a single luminescent mechanism to realize static optical output, is difficult to realize continuous wavelength tuning (380-780 nm) in the visible light range, can only obtain a limited discrete color gamut by physically blending materials with different colors, and lacks the capability of regulating and controlling colors in real time. The existing alternating current luminescent color-changing fibers (patent documents CN114892392A and CN 114990753A) are mainly characterized in that luminescent layers with different colors are respectively coated on conductive wires uniformly by a coating and melt extrusion method, and the different colors have different response performances to alternating current electric field strength and frequency due to the difference of dielectric properties of polymers in the different luminescent layers, so that color change is realized. However, since there is no control circuit, the light emitting functional layers of each color are not controlled independently, resulting in the light emitted from the device being composite light and color being impure, and patent CN103152892B reports a color conversion light emitting wire, which is a light emitting wire formed by alternately twisting nine light emitting wires of different colors into one light emitting wire, and using nine driving controllers to independently control the single light emitting wire, respectively, to realize color control. The disadvantage of this technique is that the spiral twisted structure makes the light emitting line not fully lighted, the color distribution is not uniform, and the circuit control is quite complicated. If the active functional layers capable of emitting light with different wavelengths are integrated on the same luminescent fiber in a stacking way, and the active functional layers are connected by using shared electrodes, the potential difference and the frequency applied to the active functional layers are controlled and regulated by circuit driving, so that the luminescent wavelength and the luminescent spectrum of the alternating current electroluminescent fiber can be controlled, a novel electroluminescent fiber with pure color and capable of changing color in real time is hopeful to be obtained, the evolution of the luminescent fiber from a single function to multiple modes, dynamic and intelligent is realized, and the luminescent fiber is widely applied to the fields of wearable electronic equipment and flexible display. Disclosure of Invention The invention aims to provide a dynamic color-changing electroluminescent fiber device which is programmable, controllable, wide in color gamut and high in stability and a preparation method thereof, so as to solve the problem of limitation of single luminescent color of electroluminescent fiber of a zinc sulfide system at present and meet the application requirements of intelligent electronic textiles and wearable devices. The invention provides a dyna