Preparation method of heterojunction type diode light-emitting rod driven by button cell

Abstract

The invention discloses a preparation method of a heterojunction type diode light-emitting rod driven by a button cell, and belongs to the field of photoelectric and lighting devices. The preparation method comprises the following steps: coating the light-emitting layer; taking an aluminum bar, fully coating the surface of the aluminum bar with conductive silver paste or a lithium fluoride film, placing the aluminum bar on the zinc oxide nanoparticle coating in the length direction of the light-emitting film, and rolling the light-emitting film into a barrel shape in the width direction; a cover plate is used for sealing the tail end of the cylindrical structure, a button cell is plugged into the initial end of the barrel-shaped structure, a second cover plate is used for sealing the tail end of the cylindrical structure, the negative electrode of the button cell is connected with the aluminum electrode, and the positive electrode of the button cell is connected with the linear silver electrode. According to the method, the defects that inorganic semiconductor materials lack P-type materials and organic semiconductor materials lack N-type materials are overcome, the transfer imprinting and coating processes are utilized, the production cost is low, and the product is flexible, bendable and convenient to carry.

Description

Technical Field

[0001] The invention belongs to the field of optoelectronics and lighting devices, and in particular relates to a method for preparing a heterojunction diode light-emitting rod driven by a button battery. Technical Background

[0002] The emergence of light-emitting diodes has brought human life into the era of the fourth generation of lighting. With the emergence of gallium nitride, the three primary colors of red, green and blue can all be realized through light-emitting diodes. The problem now is that the gallium element has a limited content in nature and is difficult to extract. It is often extracted as a by-product in the electrolytic aluminum industry as a companion mineral of aluminum, and the P-type doping of gallium nitride has always been a difficult problem in the industry. In order to solve the problem of gallium resources, zinc oxide has always been a highly sought-after alternative material, which has the potential to replace gallium nitride in many aspects, such as rich resources and physical and chemical properties that are very close to gallium nitride. However, zinc oxide also has its own great problem, that is, P-type doping is difficult to obtain. In the field of lighting and display, in addition to light-emitting diodes prepared by inorganic semiconductors, organic light-emitting diodes have also made great progress in recent decades. Compared with the difficulties of inorganic materials, it is more difficult to obtain N-type organics / polymers. The present invention intends to use the form of inorganic / organic heterojunction to overcome the problems of difficulty in P-type doping of inorganic semiconductors and difficulty in N-type doping of organic semiconductors, so as to realize the preparation of diode active light-emitting devices on flexible substrates. Summary of the invention

[0003] Purpose of the invention: To overcome the shortcomings of inorganic semiconductor materials lacking P-type and organic semiconductor materials lacking N-type, and to use the cheap process of transfer printing and coating to replace the processes of epitaxy and evaporation that require expensive equipment, so as to prepare a flexible, bendable, cheap, easy-to-carry and button battery-driven lighting device.

[0004] The present invention adopts the following technical solution: a method for preparing a heterojunction diode light-emitting rod driven by a button battery, comprising the following stages: The first stage: coating of the luminescent layer, divided into five steps: (1) Flatten a piece of polyparaxylene epoxy resin film, apply conductive silver paste on the surface of the polyparaxylene epoxy resin film, and wait for the organic components in the conductive silver paste to volatilize and solidify naturally to form a linear silver electrode; (2) Imprinting and transferring a two-dimensional hole injection layer on the surface of the solidified linear silver electrode to form contact with the linear silver electrode, leaving a portion of the left linear silver electrode blank; (3) Coat the surface of the two-dimensional hole injection layer with a P-type organic material, leaving the left linear silver electrode blank; (4) After the P-type organic thin layer solidifies into a solid state, lead halide perovskite quantum dots APbX3 are imprinted and transported onto its surface, where A represents rubidium Rb, cesium Cs or methylamine CH3NH2 ions, X represents halogen, and Pb is lead; (5) Finally, apply a nano electron transport layer; The second stage: take an aluminum rod, coat its surface with conductive silver paste or lithium fluoride film, wait for the organic components in the conductive silver paste or lithium fluoride to volatilize, place the rod-shaped aluminum electrode coated with conductive silver paste or lithium fluoride film on the zinc oxide nanoparticle coating along the length direction of the luminescent film, and roll the luminescent film into a barrel shape along the width direction; The third stage: Use a cover plate to seal the end of the cylindrical structure, insert a button battery into the beginning of the barrel-shaped structure, and then use a second cover plate to seal the end of the round structure. The negative pole of the button battery is connected to the aluminum electrode, and the positive pole of the button battery is connected to the linear silver electrode.

[0005] Further, a two-dimensional hole injection layer is imprinted and transported on the surface of the silver electrode after solidification, and the two-dimensional hole injection layer is molybdenum disulfide, graphene, or graphene oxide, preferably molybdenum disulfide.

[0006] Furthermore, in the first stage (5), a nano electron transport layer is finally coated, and the material is: oxides, sulfides, selenides or tellurides of divalent or tetravalent metal elements such as zinc No. 30, 4-valent, titanium No. 22, 4-valent, nickel No. 28, 2-valent, zirconium No. 40, 4-valent, molybdenum No. 42, 4-valent, cadmium No. 48, 2-valent, and tin No. 50, 4-valent.

[0007] Furthermore, the metal element oxide is zinc oxide ZnO because: the resource is abundant and easy to obtain, the preparation methods of zinc oxide nanoparticles, nanorods or nanowires are diverse and simple, and the intrinsic zinc oxide is N-type and easy to generate electrons.

[0008] Beneficial effects: The product of the present invention overcomes the shortcomings of inorganic semiconductor materials lacking P-type and organic semiconductor materials lacking N-type. It utilizes transfer printing and coating processes, has low production costs, and is flexible, bendable, and easy to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the first stage of the preparation process of the light emitting device of the present invention; Figure 2 It is a schematic diagram of the second stage of the preparation process of the light emitting device of the present invention; Figure 3 It is a schematic diagram of the third stage of the preparation process of the light emitting device of the present invention; Figure 4 It is a schematic diagram of the light-emitting effect of the device of the present invention. Specific implementation plan

[0010] In order to better understand the technical solution of the present invention, the following embodiments will further illustrate the design solution provided by the present invention, but the present invention is not limited to the listed embodiments, and should also include any other known changes within the scope of the claims of the present invention. Example

[0011] like Figure 1 As shown in the figure, a heterojunction diode light stick driven by a button battery has a first stage of preparation process, which is coating of the light-emitting layer, and is divided into five steps: (1) flattening a piece of polyparaxylene epoxy resin film 1, whose width is slightly longer than the circumference of a button battery, and whose length can be adjusted according to actual needs, and coating the light-emitting layer on the surface of the polyparaxylene epoxy resin film according to Figure 1 The shape shown is coated with conductive silver paste, and then the organic components in the conductive silver paste are allowed to evaporate and solidify naturally to form a linear silver electrode 2; (2) a two-dimensional hole injection layer 3 is imprinted on the surface of the solidified silver electrode. The two-dimensional hole injection layer, such as molybdenum disulfide, graphene or graphene oxide film, is preferably molybdenum disulfide because graphene, as a representative of two-dimensional materials, has no bandgap width, while molybdenum disulfide does, and forms contact with the silver electrode, leaving the left side of the silver electrode not covered by the two-dimensional hole injection layer; (3) as shown in the figure, a P-type organic (4) After the thin layer of P-type organic matter solidifies into a solid state, perovskite quantum dots 5 are imprinted and transported on its surface, APbX3 quantum dots, where A represents rubidium Rb, cesium Cs or methylamine CH3NH2 ions, X represents halogen, and Pb is lead; (5) Finally, a nano electron transport layer 6 is applied, preferably zinc oxide ZnO, because: the resources are abundant and easy to obtain, the preparation methods of zinc oxide nanoparticles, nanorods or nanowires are diverse and simple, and the intrinsic zinc oxide is N-type and easy to generate electrons. Others include oxides, sulfides, selenides or tellurides of divalent and tetravalent metal elements such as titanium (No.22, 4-valent), nickel (No.28, 2-valent), zirconium (No.40, 4-valent), molybdenum (No.42, 4-valent), cadmium (No.48, 2-valent), and tin (No.50, 4-valent).

[0012] like Figure 2 As shown, an aluminum rod 8 is taken, whose length is equal to the length of the P-type polymer film, and a conductive silver paste or a lithium fluoride film 7 is coated on its surface. After the organic components in the conductive silver paste or lithium fluoride are volatilized, the rod-shaped aluminum electrode coated with the conductive silver paste is placed on the zinc oxide nanoparticle coating along the length direction of the light-emitting film, and the light-emitting film is rolled into a barrel shape along the width direction.

[0013] like Figure 3As shown, a round plastic cover is used to seal the end of the cylindrical structure (on the right), and a button battery (or two or three, the specific number of batteries is determined by the different driving voltages caused by the materials selected for the device) is inserted into the beginning of the barrel-shaped structure (on the left), and then a second round plastic cover is used to seal the end of the round structure.

[0014] like Figure 4 The figure shows the structure and luminous effect of the heterojunction light stick driven by a button cell after preparation. The negative electrode of the button cell is connected to the aluminum electrode, and the negative current (electron flow) is conducted through the aluminum electrode to the silver electrode and then to the zinc oxide layer; the positive electrode of the button cell is connected to the linear silver electrode, and the positive current (hole flow) is conducted through the silver electrode to the two-dimensional material and then to the organic layer; the holes and electrons are combined at the quantum dots to become photons, which are then emitted.

[0015] The product prepared by the present invention overcomes the shortcomings of inorganic semiconductor materials lacking P-type and organic semiconductor materials lacking N-type. The mature and inexpensive processes of transfer printing and coating are used to replace epitaxy and evaporation processes that require expensive equipment, thereby preparing a flexible, bendable, inexpensive, easy-to-carry lighting fixture that can be driven by button batteries.

Claims

1. A method for preparing a heterojunction diode light-emitting rod driven by a button cell, characterized in that: The following phases are included: The first stage: coating of the luminescent layer, divided into five steps: (1) Flatten a piece of polyparaxylene epoxy resin film, apply conductive silver paste on the surface of the polyparaxylene epoxy resin film, and wait for the organic components in the conductive silver paste to volatilize and solidify naturally to form a linear silver electrode; (2) Imprinting and transferring a two-dimensional hole injection layer on the surface of the solidified linear silver electrode to form contact with the linear silver electrode, leaving a portion of the left linear silver electrode blank; (3) Coat the surface of the two-dimensional hole injection layer with a P-type organic material, leaving the left linear silver electrode blank; (4) After the P-type organic thin layer solidifies into a solid state, lead halide perovskite quantum dots APbX3 are imprinted and transported onto its surface, where A represents rubidium Rb, cesium Cs or methylamine CH3NH2 ions, X represents halogen, and Pb is lead; (5) Finally, apply a nano electron transport layer; The second stage: take an aluminum rod, coat its surface with conductive silver paste or lithium fluoride film, wait for the organic components in the conductive silver paste or lithium fluoride to volatilize, place the rod-shaped aluminum electrode coated with conductive silver paste or lithium fluoride film on the zinc oxide nanoparticle coating along the length direction of the luminescent film, and roll the luminescent film into a barrel shape along the width direction; The third stage: Use a cover plate to seal the end of the cylindrical structure, insert a button battery into the beginning of the barrel-shaped structure, and then use a second cover plate to seal the end of the round structure. The negative pole of the button battery is connected to the aluminum electrode, and the positive pole of the button battery is connected to the linear silver electrode.

2. The method for preparing a heterojunction diode light-emitting rod driven by a button cell according to claim 1, characterized in that: The two-dimensional hole injection layer of molybdenum disulfide, graphene and graphene oxide is imprinted and transported on the surface of the silver electrode after solidification.

3. The method for preparing a heterojunction diode light-emitting rod driven by a button cell according to claim 1, characterized in that: In the first stage (5), a nano electron transport layer is finally coated, and the material is: oxides, sulfides, selenides or tellurides of divalent or tetravalent metal elements such as zinc No. 30, 4-valent, titanium No. 22, 4-valent, nickel No. 28, 2-valent, zirconium No. 40, 4-valent, molybdenum No. 42, 4-valent, cadmium No. 48, 2-valent, and tin No. 50, 4-valent.

4. The method for preparing a heterojunction diode light-emitting rod driven by a button cell according to claim 3, characterized in that: The metal element oxide is zinc oxide ZnO.

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