CN114879390B - Nanowire structural color display screen and manufacturing method thereof - Google Patents

Nanowire structural color display screen and manufacturing method thereof Download PDF

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Publication number
CN114879390B
CN114879390B CN202210629772.6A CN202210629772A CN114879390B CN 114879390 B CN114879390 B CN 114879390B CN 202210629772 A CN202210629772 A CN 202210629772A CN 114879390 B CN114879390 B CN 114879390B
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gold
gold nanowire
nanowire
nanowire array
display screen
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CN114879390A (en
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倪海彬
高绪之
平安
沈依
田俊
倪波
常建华
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Nanjing University of Information Science and Technology
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Nanjing University of Information Science and Technology
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    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B82NANOTECHNOLOGY
    • B82YSPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00Nanotechnology for materials or surface science, e.g. nanocomposites
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B82NANOTECHNOLOGY
    • B82YSPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00Manufacture or treatment of nanostructures
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00Materials and properties
    • G02F2202/36Micro- or nanomaterials

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Nanotechnology (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Optics & Photonics (AREA)
  • Manufacturing & Machinery (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The invention discloses a nanowire structural color display screen and a manufacturing method thereof in the technical field of display screens, and the nanowire structural color display screen comprises gold nanowire arrays formed by packaging a plurality of gold nanowires, wherein the gold nanowire arrays are distributed between two transparent electrode plates, each gold nanowire is relatively vertical to each transparent electrode plate, each gold nanowire array is filled with liquid, electrodes corresponding to each gold nanowire array are arranged on the transparent electrode plates, and the height of the liquid filled in each gold nanowire array changes along with the regulation and control of corresponding electrode voltages, so that the resonant wavelength in each gold nanowire array shifts, and light with different colors is reflected under the irradiation of a light source. According to the invention, the height difference of the liquid filled in the gold nano-wires causes the change of the resonance mode to reflect light with different colors, so that the color display of a screen is realized, and the nano-wires have the characteristics of high hardness and good elasticity, and the service life is longer.

Description

Nanowire structural color display screen and manufacturing method thereof
Technical Field
The invention relates to a nanowire structural color display screen and a manufacturing method thereof, and belongs to the technical field of display screens.
Background
Nanowires are a material having a thickness in the nanometer range. They are ten times harder than existing materials and are also very flexible, so that they can adapt to various shapes while recovering their original shape. Nanowires can be defined as a structure having one dimension limited to less than 100 nanometers in the lateral direction (without limitation in the longitudinal direction). Suspended nanowires refer to nanowires whose ends are fixed under vacuum. Typical nanowires have aspect ratios above 1000, so they are commonly referred to as one-dimensional materials. Nanowires can be classified into different types according to the constituent materials, including gold nanowires, semiconductor nanowires, and insulator nanowires. Nanowires can be made by suspension methods, deposition methods, or elemental synthesis methods. The nanowire has the characteristics of strong mechanical property, good toughness and weak conductivity.
At present, the main display screens in the market are liquid crystal display screens, and meanwhile, the liquid crystal display screens are mainly divided into an LCD display screen and an LED display screen. The LCD liquid crystal display works on the principle that there are many liquid crystal particles inside the display, they are regularly arranged in a certain shape, and the colors of each of them are divided into: red, green, blue. The three primary colors can be restored to any other colors, and when the display receives the display data of the computer, each liquid crystal particle is controlled to rotate to the surface with different colors so as to combine different colors and images. This also results in the LCD liquid crystal display screen having an insufficient color, a low viewing angle, and light leakage. The LED display screen is a display screen for displaying various information such as text, graphics, images, animation, quotation, video signals and the like by controlling the display mode of the semiconductor light emitting diode. However, due to different working time of the light emitting diode, the aging degree of the light emitting diode is different, so that the screen burning phenomenon can occur, and the service life is short.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a nanowire structural color display screen and a manufacturing method thereof, wherein the height difference of liquid filled in gold nanowires is utilized to cause the change of resonance modes to reflect light with different colors, so that the color display of the screen is realized, and the nanowire material has the characteristics of high hardness and good elasticity, and the service life is prolonged.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the invention provides a nanowire structure color display screen, which comprises a gold nanowire array formed by packaging a plurality of gold nanowires, wherein the gold nanowire arrays are distributed between two transparent electrode plates, each gold nanowire is relatively vertical to each transparent electrode plate, each gold nanowire array is filled with liquid, electrodes corresponding to the gold nanowire arrays are arranged on the transparent electrode plates, and the height of the liquid filled in each gold nanowire array changes along with the regulation and control of the corresponding electrode voltage, so that the resonant wavelength in each gold nanowire array shifts, and light with different colors is reflected under the irradiation of a light source.
Further, the two transparent electrode plates are respectively a carbon-based flexible material and a glass sheet, the bottom of the gold nanowire array is fixed on the carbon-based flexible material, the glass sheet covers the top of the gold nanowire array, one surface of the glass sheet, which is contacted with the gold nanowire array, is insulated, and the other surface of the glass sheet is coated with a conductive material.
Further, the gold nanowire is prepared by a template method, a laser ablation method, an anodic oxidation method or a silicon corrosion method, and the diameter is 10nm-50nm.
Further, the gold nanowire array is obtained by directional growth on a transparent quartz or silicon substrate, wherein the gold nanowire array is prepared by a metal-assisted chemical etching method, the length of the gold nanowire is controlled according to etching time, and the metal at the tail end of the gold nanowire is stripped by an etching method.
Further, the liquid filled in the gold nanowire array is liquid crystal.
Furthermore, the nanowire structural color display screen reflects R, G, B colors under white light irradiation by changing the electrode voltages at two ends of the gold nanowire array.
In a second aspect, a method for manufacturing a nanowire structural color display screen includes:
dividing the display screen into a plurality of areas;
preparing gold nanowires by using a porous anodic aluminum oxide template method;
preparing a gold nanowire array by a metal-assisted chemical etching method;
fixing the stripped gold nanowire array on a carbon-based flexible material, covering a glass sheet above the gold nanowire array to insulate one surface of the glass sheet contacting the gold nanowire array, and brushing a layer of conductive material on the other surface of the glass sheet to conduct electricity;
filling liquid in the gold nanowire array, and controlling the liquid height difference in the gold nanowire array to cause the change of a resonance mode through different voltage differences, so that the gold nanowire array reflects light with different colors;
and sequentially arranging the gold nanowire arrays in all areas which are uniform and differentiated, and reflecting light with different colors by regulating and controlling the voltage differences of different gold nanowire arrays according to the pixel requirements of display patterns.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the height difference of the liquid filled in the gold nanowire causes the change of the resonance mode to reflect light with different colors, so that the color display of the screen is realized, and the color of the display screen can be more vivid; the height of the liquid in the gold nanowire is controlled by the voltage difference, so that the invention saves more electricity; the manufacturing cost is cheaper because the materials for producing the nanowires are easy to obtain and the manufacturing method is simpler and simpler; the nanowire material has the characteristics of high hardness and good elasticity, so that the service life of the nanowire material is longer; fixing the gold nanowire array on the carbon-based flexible material can lead to lighter and thinner display screen.
Drawings
FIG. 1 is a top view of a display screen divided into different regions provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of preparing gold nanowires provided by an embodiment of the present invention;
FIG. 3 is a diagram of an array of gold nanowires of the same diameter provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of a layer of glass sheet coated on an array of gold nanowires provided by an embodiment of the present invention;
FIG. 5 is a schematic diagram of adding voltage to a gold nanowire array provided by an embodiment of the present invention;
fig. 6 is a schematic diagram of white light illumination according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Examples:
a nanowire structural color display screen as shown in fig. 1-6, the display screen being fabricated by:
directionally growing a gold nanowire array on a transparent quartz or silicon substrate, so that the gold nanowire array is positioned between two electrode plates; filling the gold nanowires with a liquid, which may be a liquid crystal or other polymer, and applying a voltage difference between the two electrode plates; regulating and controlling the height difference of the liquid filled in the gold nanowire array through an electric field, so as to cause the shift of resonant wavelength in the nanowire array; when a beam of white light is irradiated onto the gold nanowire, the height difference of the liquid in the gold nanowire caused by different voltage differences causes the change of resonance modes so as to reflect light of different colors; electrode density is designed according to the size of the display screen and pixel requirements, and the reflective color of each pixel is dynamically regulated and controlled by regulating and controlling the voltage applied to each electrode, so that the color display of the display screen is realized, and the super diffraction limit display resolution can be obtained; can be used for flexible substrates and can also be used for transmitting display colors.
For this method, the specific preparation steps of the invention are as follows:
a) The display screen is divided into a plurality of areas as shown in fig. 1.
b) The gold nanowires can be prepared by a template method, a laser ablation method, anodic oxidation, silicon corrosion and other methods, the diameter is 10nm-50nm, the gold nanowires are prepared by an AAO (porous anodic aluminum oxide) template method, the AAO template is soaked in an aqueous solution system of polyvinyl alcohol (PVA), distilled water and HAuCl4 at room temperature, ultraviolet light (more than 290 nm) is used as an induction excitation condition to irradiate the whole aqueous solution system for about 5 hours, after a nanowire product is generated, the AAO template is removed by NaOH, and the gold nanowires with the diameter of about 20nm are obtained, as shown in figure 2.
c) Preparing a gold nanowire array by a metal-assisted chemical etching method, controlling the length of gold nanowires according to etching time, stripping metal at the tail ends of the gold nanowires by an etching method, and fixing the stripped gold nanowire array on a carbon-based flexible material, as shown in fig. 3.
d) And a glass sheet is covered above the array formed by the gold nano wires, one surface of the glass sheet contacting the gold nano wire array is insulated, and the other surface of the glass sheet is brushed with a layer of conductive substance to make the glass sheet conductive, as shown in fig. 4.
e) Filling liquid in the gold nanowire array, controlling the liquid height difference in the gold nanowire array through different voltage differences to cause the change of resonance modes, and therefore realizing that the gold nanowire array reflects light with different colors, as shown in fig. 5. By changing the voltages at two ends of different gold nanowire arrays, the liquid heights in the gold nanowires are changed, R, G, B colors are reflected respectively, a beam of white light is irradiated on the gold nanowire arrays, and the light with different colors can be reflected due to the change of resonance modes caused by the liquid height differences in the gold nanowires.
f) The gold nanowire arrays are sequentially arranged in all areas which are uniform and differentiated, and the different gold nanowire arrays reflect light with different colors by regulating and controlling the voltage difference of the different gold nanowire arrays according to the pixel requirements of the display pattern, so that the effect of color display is achieved, as shown in fig. 6.
The present invention is not limited to the above embodiments, which are merely illustrative of the technical concept and features of the present invention, and the present invention is not limited to the above embodiments. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.

Claims (6)

1. The nanowire structure color display screen is characterized by comprising gold nanowire arrays formed by packaging a plurality of gold nanowires, wherein the gold nanowire arrays are distributed between two transparent electrode plates, each gold nanowire is relatively vertical to each transparent electrode plate, each gold nanowire array is filled with liquid, electrodes corresponding to the gold nanowire arrays are arranged on the transparent electrode plates, and the height of the liquid filled in each gold nanowire array changes along with the regulation and control of the corresponding electrode voltage, so that the resonant wavelength in each gold nanowire array shifts, and light with different colors is reflected under the irradiation of a light source;
the liquid filled in the gold nanowire array is liquid crystal.
2. The nanowire structural color display screen according to claim 1, wherein the two transparent electrode plates are respectively a carbon-based flexible material and a glass sheet, the bottom of the gold nanowire array is fixed on the carbon-based flexible material, the glass sheet covers the top of the gold nanowire array, one surface of the glass sheet contacting the gold nanowire array is insulated, and the other surface of the glass sheet is coated with a conductive material.
3. The nanowire structural color display screen according to claim 1, wherein the gold nanowire is prepared by a template method, a laser ablation method, an anodic oxidation method or a silicon etching method, and has a diameter of 10nm-50nm
4. The nanowire structure color display screen according to claim 1, wherein the gold nanowire array is obtained by directional growth on transparent quartz or a silicon substrate, wherein the gold nanowire array is prepared by a metal-assisted chemical etching method, the length of the gold nanowires is controlled according to etching time, and the metal at the ends of the gold nanowires is stripped by an etching method.
5. The nanowire structure color display screen according to claim 1, wherein the nanowire structure color display screen reflects under white light irradiation by changing electrode voltages across the gold nanowire arrayRGBColor.
6. A method of color display screen based on nanowire structures as claimed in any one of claims 1 to 5, comprising:
uniformly dividing the display screen into a plurality of areas;
preparing gold nanowires by using a porous anodic aluminum oxide template method;
preparing a gold nanowire array by a metal-assisted chemical etching method;
fixing the stripped gold nanowire array on a carbon-based flexible material, covering a glass sheet above the gold nanowire array to insulate one surface of the glass sheet contacting the gold nanowire array, and brushing a layer of conductive material on the other surface of the glass sheet to conduct electricity;
filling liquid in the gold nanowire array, and controlling the liquid height difference in the gold nanowire array to cause the change of a resonance mode through different voltage differences, so that the gold nanowire array reflects light with different colors;
and sequentially arranging the gold nanowire arrays in uniformly differentiated areas, and reflecting light with different colors by regulating and controlling the voltage differences of different gold nanowire arrays according to the pixel requirements of display patterns.
CN202210629772.6A 2022-06-06 2022-06-06 Nanowire structural color display screen and manufacturing method thereof Active CN114879390B (en)

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