KR20210131730A - Fiber light emitting device and manufacturing method of the same - Google Patents

Abstract

The present specification discloses a fiber-type light emitting device that includes a cylindrical core fiber extended in a longitudinal direction, a plurality of cylindrical fiber-type electrodes extended in the longitudinal direction parallel to the core fiber and disposed on the outer circumferential surface of the core fiber, and a cylindrical electroluminescent layer surrounding the core fiber and the plurality of fiber-type electrodes.

Description

Fiber-type light emitting device and its manufacturing method

The present specification relates to a fiber-type light-emitting device, and more particularly, to provide a fiber-type light-emitting device using a conductive fiber as an electrode and a method for manufacturing the same.

In general, electroluminescence (EL) refers to a phenomenon in which light is generated when an electric field is applied to a material, and can be divided into structures of AC thin film type, AC thick film type, DC thin film type and DC AC type.

In the case of the AC type, there is basically a thin film structure composed of upper and lower insulating layers centered on a light emitting layer, or a thick film structure composed of an insulating binder including a reflective layer containing an insulating material and a light emitting layer. In addition, the DC type includes a thin film type composed of one insulating layer and a light emitting layer and a thick film type composed of only a light emitting layer.

However, since the electroluminescent device having such a structure basically exhibits low luminance and efficiency, it is difficult to apply it to a display device requiring high luminance and efficiency, and improvement of these characteristics is urgently required.

On the other hand, recently, as interest in the smart clothing field in which display technology and fashion such as sports clothing are fused increases, research on electroluminescent devices using stretchable conductive fibers is attracting attention.

However, conventionally developed fibrous electroluminescent devices have disadvantages in that they easily lose their electrical properties when stretchability is applied, and their mechanical or electrical stability is very weak. For example, conventional conductive fibers are generally made in the form of using a metal as an electrode on the surface or inside of the fiber, and although the metal electrode can exhibit excellent electrical performance based on the coating, external factors such as stretching or bending There is a disadvantage in that stability is weak, such as cracks in the metal coating due to stimulation.

In addition, when resin is used together with the metal electrode, the size of the light emitting device is relatively large, and there is a problem in that luminous efficiency is lowered.

Therefore, there is a need to develop a fiber-type electroluminescent device having both excellent electrical performance and mechanical stability. Accordingly, the inventors of the present specification have invented a fiber-type light emitting device capable of emitting light even at a low voltage and having excellent tensile strength and a method for manufacturing the same.

The problems to be solved according to the embodiments of the present specification to be described below are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

A fiber-type light emitting device according to an embodiment of the present specification includes a cylindrical core fiber extending in a longitudinal direction, a plurality of fiber-like electrodes of a cylindrical shape extending in a longitudinal direction parallel to the core fiber, and disposed on the outer circumferential surface of the core fiber, It consists of a cylindrical electroluminescent layer surrounding a core fiber and a plurality of fibrous electrodes.

In the fiber-type light emitting device according to an embodiment of the present specification, the core fiber is made of a flexible fiber.

In the fibrous light emitting device according to an embodiment of the present specification, the plurality of fibrous electrodes are made of elastic fibers containing conductive nanoparticles.

In the fiber-type light emitting device according to an embodiment of the present specification, a plurality of fiber-type electrodes are disposed to face each other in the radial direction of the core fiber.

In the fiber-type light emitting device according to an embodiment of the present specification, the plurality of fiber-type electrodes are disposed such that an acute angle formed with the center of the core fiber has an angle smaller than 180 degrees.

In the fiber-type light emitting device according to an embodiment of the present specification, the electroluminescent layer is formed by curing a polymer solution in which a silicon-based polymer and electroluminescent powder are mixed.

In the fiber-type light emitting device according to an embodiment of the present specification, the silicone-based polymer is polydimethylsiloxane (PDMS) or Ecoflex.

In the fiber-type light emitting device according to an embodiment of the present specification, the electroluminescent powder is ZnS:Cu, ZnS:Mn, ZnS:Cl, ZnS:Al, ZnS:I, ZnO:Al, ZnO:Cu, ZnO:Mn, and at least one zinc sulfide (ZnS) component selected from the ZnS:Tb series.

In the fiber-type light emitting device according to an embodiment of the present specification, the electroluminescent layer is a mixture of the silicon-based polymer and the electroluminescent powder in a ratio of 50:50.

In the fiber-type light emitting device according to an embodiment of the present specification, the electroluminescent layer is formed by curing a polymer solution at room temperature for 3 to 5 hours.

In the fiber-type light emitting device according to an embodiment of the present specification, the electroluminescent layer is formed to have a diameter of 1 mm or less.

A method of manufacturing a fiber-type light emitting device according to an embodiment of the present specification includes forming a core fiber, coupling a plurality of fiber-type electrodes to the outer circumferential surface of the core fiber, and a core fiber in which a plurality of fiber-type electrodes are coupled disposing in a cylindrical mold, mixing a polymer and electroluminescent powder to form a polymer solution, injecting the polymer solution into the space in the cylindrical mold, and curing the polymer solution to form an electroluminescent layer include

According to the embodiments of the present specification, there is an effect that a fiber-type light emitting device capable of emitting light even at a low voltage can be manufactured.

In addition, according to the embodiments of the present specification, there is an effect that a fiber-type light emitting device having excellent tensile strength can be manufactured.

In addition, according to the embodiments of the present specification, there is an effect that a fiber-type light emitting device applicable to stretchable smart clothing can be manufactured based on excellent tensile strength.

The effects of the embodiments disclosed herein are not limited to the above-mentioned effects. In addition, the embodiments disclosed herein may generate other effects not mentioned above, which will be clearly understood by those skilled in the art from the following description.

1 is a view showing a perspective view of a fiber-type light emitting device according to an embodiment of the present specification,
2 is a view showing a cross-sectional view of a fiber-type light emitting device according to an embodiment of the present specification,
3 is a view showing a cross-sectional view of a fiber-type light emitting device according to another embodiment of the present specification,
4 is a flowchart illustrating a method of manufacturing a fiber-type light emitting device according to an embodiment of the present specification;
5a to 5e are views showing a structure according to a method of manufacturing a fiber-type light emitting device according to an embodiment of the present specification,
6 is a graph showing the change in luminance according to the ratio of the electroluminescent powder constituting the electroluminescent layer for the fiber-type light emitting device according to an embodiment of the present specification;
7 is a graph showing the change in luminance according to the tensile rate of the fiber-type light emitting device according to an embodiment of the present specification.

Advantages and features of the present specification and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present specification is not limited to the embodiments disclosed below, but will be implemented in various different forms, only these embodiments allow the disclosure of the present specification to be complete, and common knowledge in the technical field to which this specification belongs It is provided to fully inform the possessor of the scope of the invention, and this specification is only defined by the scope of the claims.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present specification are illustrative and the present specification is not limited to the illustrated matters. Like reference numerals refer to like elements throughout. In addition, in describing the present specification, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present specification, the detailed description thereof will be omitted. When "includes", "having", "consisting of", etc. mentioned in this specification are used, other parts may be added unless "only" is used. When a component is expressed in the singular, the case in which the plural is included is included unless otherwise explicitly stated.

In interpreting the components, it is interpreted as including an error range even if there is no separate explicit description.

In the case of a description of a positional relationship, for example, when the positional relationship of two parts is described as "on", "on", "on", "next to", etc., "immediately" Alternatively, one or more other parts may be placed between two parts unless "directly" is used.

In the case of a description of a temporal relationship, for example, "after", "after", "after", "before", etc., when the temporal precedence is described, "immediately" or "directly" It may include cases that are not continuous unless " is used.

In the case of a description of the signal flow relationship, for example, even in the case of "a signal is transmitted from node A to node B", unless "directly" or "directly" is used, node A goes through another node Thus, a case in which a signal is transmitted to node B may be included.

Although the first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Accordingly, the first component mentioned below may be the second component within the spirit of the present specification.

Each feature of the various embodiments of the present specification may be partially or wholly combined or combined with each other, technically various interlocking and driving are possible, and each of the embodiments may be independently implemented with respect to each other or may be implemented together in a related relationship. may be

Hereinafter, various embodiments of the present specification will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a fiber-type light emitting device according to an embodiment of the present specification, and FIG. 2 is a cross-sectional view.

1 and 2 , the fiber-type light emitting device 100 according to an embodiment of the present specification includes a core fiber 110 , a plurality of fiber-type electrodes 120 , and an electroluminescent layer 130 .

The core fiber 110 may be a cylindrical flexible fiber extending long in the longitudinal direction, and the flexible fiber may have softness or elasticity. Core fibers 110 may be transparent, translucent, opaque or reflective, and may be glass, plastic, ceramic, or metal foil.

The core fiber 110 may include a flexible polymer, a metallic material, or glass.

The flexible polymer may be a polyolefin such as polyethylene, polypropylene or polytetrafluoroethylene, polysiloxane, epoxies, polyacrylates, polyethyleneterephthalate, and derivatives thereof, and the metallic material may include aluminum, copper or steel. The glass may also be soda-lime glass, Ba- or Sr-containing glass, lead glass, aluminum silicate glass, borosilicate glass, Ba borosilicate glass or quartz.

The plurality of fibrous electrodes 120 may have a cylindrical structure including conductive nanoparticles based on elastic fibers.

For example, the fibrous electrode 120 is made of an elastic fiber and a flexible polymer that coats the outside of the elastic fiber while containing metal nanoparticles, or includes an elastic fiber containing metal nanoparticles and It may also be formed of a metal nano-shell surrounding the periphery of the elastic fiber.

The elastic fiber constituting the fibrous electrode 120 is a fiber having elasticity like rubber, and may be a type of polyurethane-based fiber. For example, elastic fibers can have high elasticity by containing at least 85% or more polyurethane bonds in the fiber-forming material.

In this case, the polyurethane is a polymer compound having a urethane bond (-NHCOO-), and may have both properties of an amide bond (-NHCO-) and an ester bond (-CO-). That is, polyurethane is a structure in which an amide group (-CONH-) of nylon is substituted with a urethane group, and may have a structure having one more oxygen atom than nylon. Elastic fibers may be manufactured to have various chemical structures, and may be manufactured by various methods.

The flexible polymer coating the elastic fiber is a styrene-butadiene-styrene (SBS) polymer, a silicone-based polymer (Polydimethyl siloxane (PDMS) or Ecoflex), a styrene butadiene rubber (SBR) polymer, or Polymers such as poly(vinylidene fluoride-co-hexafluoropropylene) may be used.

The metal nanoparticles may be made of, for example, a noble metal such as gold (Au), silver (Ag), platinum (Pt), or iridium (Ir). In addition, the metal nanoparticles may be included in a large amount in an amount of 60 wt % to 90 wt % in the elastic fiber, but is not limited thereto. In addition, the metal nanoparticles may have a concentration gradient in which the concentration decreases from the surface of the elastic fiber toward the center thereof.

The metal nano-shell may be formed in the form of a shell in which metal nanoparticles are coated with an elastic fiber.

Due to this structure, the plurality of fibrous electrodes 120 may have high elasticity and high conductivity at the same time.

When the fibrous electrode 120 is made of two strands, each fibrous electrode 120 serves as a positive electrode and a negative electrode, respectively, and the potential difference formed between the two fibrous electrode 120 is Accordingly, the electroluminescent layer 130 emits light.

The electroluminescent layer 130 may be formed by curing a polymer solution in which a silicon-based polymer and electroluminescent powder are mixed so as to increase luminous efficiency while having elasticity.

The silicone-based polymer may be polydimethyl siloxane (PDMS) or Ecoflex. For reference, Ecoflex is a polybutylene adipate terephthalate commercially available from BASF Corp. of Florum Park, New Jersey, USA.

In addition, the electroluminescent powder is one or more zinc sulfide ( ZnS) component.

At this time, the plurality of fibrous electrodes 120 may extend in the longitudinal direction parallel to the core fiber 110 and may be disposed on the outer peripheral surface of the core fiber 110 so as to face in the radial direction. That is, the angle formed by the plurality of fiber-type electrodes 120 with respect to the core fiber 110 may be 180 degrees.

On the other hand, if the electroluminescent layer 130 can emit light due to the potential difference formed between the fiber-type electrodes 120 , the angle formed by the plurality of fiber-type electrodes 120 with respect to the core fiber 110 is greater than 180 . It might be small.

3 is a view showing a cross-sectional view of a fiber-type light emitting device according to another embodiment of the present specification.

Referring to FIG. 3 , the fiber-type light emitting device 100 according to another embodiment of the present specification includes a core fiber 110 , a plurality of fiber-type electrodes 120 , and an electroluminescent layer 130 .

Here, the plurality of fibrous electrodes 120, for example, the two-stranded fibrous electrodes 120 are cored so as to face radially from the center of the core fiber 110 with respect to the core fiber 110 in the central portion. While being disposed on the outer peripheral surface of the fiber 110, it may be disposed in parallel with the core fiber 110 in the longitudinal direction.

When viewed in cross section, the angle formed by the two fibrous electrodes 120 corresponding to the positive electrode and the negative electrode with the core fiber 110 as the center may be 180 degrees, but between the fibrous electrodes 120 . Since the EL layer 130 can emit light by the potential difference formed, the angle A formed by the plurality of fibrous electrodes 120 around the core fiber 110 may be smaller than 180.

That is, two fibrous electrodes 120 with the core fiber 110 as the center are located on the outer circumferential surface of the core fiber 110 , and the two fibrous electrodes 120 are formed with the center of the core fiber 110 . The acute angle may have an angle less than 180 degrees, for example an angle of 150 degrees or 120 degrees.

As such, when the angle between the two fibrous electrodes 120 and the center of the core fiber 110 is less than 180, the difference in the amount of light emitted between the fibrous electrode 120 at an acute angle and at an obtuse angle. may fly

4 is a flowchart illustrating a method of manufacturing a fiber-type light emitting device according to an embodiment of the present specification, and FIGS. 5A to 5E are views showing the structure of the fiber-type light emitting device according to the manufacturing method.

4 and 5 , the method of manufacturing a fiber-type light emitting device according to an embodiment of the present specification includes forming a core fiber 110 ( S100 ), and forming a fiber-type electrode 120 with the core fiber 110 . A step of bonding to the outer circumferential surface of (S200), disposing the core fiber 110 and the fibrous electrode 120 in the cylindrical mold 140 (S300), a polymer solution 130a by mixing a polymer and electroluminescent powder Forming (S400), injecting the polymer solution 130a into the space in the cylindrical mold 140 (S500), and curing the polymer solution 130a to form the electroluminescent layer 130 (S600) may include

In the step of forming the core fiber 110 (S100), the core fiber 110 constituting the fiber-type light emitting device 100 is formed by elongating the cylindrical flexible or rigid fiber having ductility or elasticity in the longitudinal direction. It is a forming step. At this time, the cross section of the core fiber 110 will have a diameter Fd of a certain size (FIG. 5a).

The step (S200) of coupling the fibrous electrode 120 to the outer circumferential surface of the core fiber 110 is the core fiber 110 so as to face a plurality of fibrous electrodes 120 having high elasticity and high conductivity at the same time in the radial direction. This is the step of placing it on the outer periphery. The fibrous electrode 120 may have a cylindrical structure including conductive nanoparticles based on elastic fibers.

At this time, since the fibrous electrode 120 also has a cylindrical structure extending long in the longitudinal direction like the core fiber 110, the cross section of the fibrous electrode 120 will have a diameter (Ed) of a certain size. (Fig. 5b). Therefore, in a state in which the fibrous electrode 120 is disposed on the outer circumferential surface of the core fiber 110 to face in the radial direction, the cross-sectional length of the core fiber 110 and the fibrous electrode 120 is Fd + 2*Ed. will be.

The step (S300) of disposing the core fiber 110 and the fibrous electrode 120 in the cylindrical mold 140 is a core fiber in which the fibrous electrode 120 is coupled to the inside of the cylindrical mold 140 having a space therein. (110) is a step of placing.

At this time, since the inner diameter (Md) of the cylindrical mold 140 has a larger value than the cross-sectional length (Fd + 2 * Ed) of the core fiber 110 and the fibrous electrode 120, the cylindrical mold 140 The core fiber 110 and the fibrous electrode 120 disposed therein may be spaced apart from the inner surface of the cylindrical mold 140 at a predetermined distance ( FIG. 5C ). In this structure, the inner diameter Md of the cylindrical mold 140 may have a value of 1 mm or less.

Forming the polymer solution 130a by mixing the polymer and the electroluminescent powder ( S400 ) is a process of preparing the polymer solution 130a in which the polymer and the electroluminescent powder are mixed to form the electroluminescent layer 130 .

The polymer solution 130a may be formed by mixing a silicone-based polymer and electroluminescent powder, and the silicone-based polymer may be polydimethyl siloxane (PDMS) or Ecoflex, and the electroluminescent powder is One or more zinc sulfide (ZnS) components selected from ZnS:Cu, ZnS:Mn, ZnS:Cl, ZnS:Al, ZnS:I, ZnO:Al, ZnO:Cu, ZnO:Mn, ZnS:Tb series have. Preferably, by mixing the polymer and the electroluminescent powder in a ratio of 1:1, the luminous efficiency of the electroluminescent layer 130 can be increased while maintaining the stretchability of the polymer.

Here, the step (S400) of forming the polymer solution (130a) is exemplified as proceeding after the step (S300) of arranging the core fiber 110 and the fibrous electrode 120 in the cylindrical mold 140, Since the step of forming the polymer solution 130a (S400) may proceed independently of the process of forming the core fiber 110 or coupling the fibrous electrode 120 to the core fiber 110, the core fiber 110 and It will be apparent that the fibrous electrode 120 may be performed at any point prior to the step (S300) of disposing the fibrous electrode 120 in the cylindrical mold 140 .

In the step (S500) of injecting the polymer solution 130a into the space within the cylindrical mold 140, in the cylindrical mold 140 in a state in which the core fibers 110 to which the plurality of fibrous electrodes 120 are coupled are arranged, cylindrical This is a step of injecting the polymer solution 130a into the space formed between the mold 140 and the core fiber 110 and the fibrous electrode 120 ( FIG. 5D ).

The polymer solution 130a injected into the cylindrical mold 140 will have a diameter equal to the inner diameter Md of the cylindrical mold 140 .

In the step (S600) of curing the polymer solution 130a to form the electroluminescent layer 130, the electroluminescent layer coating the core fiber 110 and the fibrous electrode 120 by curing the polymer solution 130a for a predetermined time. It is a step of forming 130 (FIG. 5e). Preferably, by maintaining the polymer solution 130a at room temperature for 3 to 5 hours, the electroluminescent layer 130 can be formed.

Through this process, the diameter (ELd) of the electroluminescent layer 130 cured to a structure for coating the core fiber 110 and the fibrous electrode 120 has the same value as the inner diameter (Md) of the cylindrical mold 140 . will be In addition, when the inner diameter (Md) of the cylindrical mold 140 has a size of 1 mm or less, since the diameter (ELd) of the electroluminescent layer 130 also has a size of 1 mm or less, the diameter of the fiber-type light emitting device 100 can be formed to a size of 1 mm or less.

As such, when the fibrous electrode 120 is disposed in the radial direction around the cylindrical core fiber 110, the distance between the fibrous electrodes 120 becomes narrower, so that even at a relatively low alternating voltage, the fibrous light emitting device ( 100) can emit light.

6 is a graph showing the change in luminance according to the ratio of the electroluminescent powder constituting the electroluminescent layer for the fiber-type light emitting device according to an embodiment of the present specification.

Referring to FIG. 6 , with respect to the fiber-type light emitting device 100 according to an embodiment of the present specification, the electroluminescent powder constituting the electroluminescent layer 130 is used as zinc sulfide (ZnS), and the ratio with the polymer is In the case of 25% (polymer: ZnS = 75: 25) and when the ratio of the electroluminescent powder is 50% (polymer: ZnS = 50: 50), the luminance changes according to the input voltage, respectively.

When the polymer solution 130a is formed so that the ratio of the polymer to zinc sulfide (ZnS) is 50:50 and cured to form the electroluminescent layer 13, the fiber-type light emitting device 100 of the present invention is about It can be seen that the luminance of ^{about 100 cd/m 2} is exhibited at an input voltage of 0.7 V/μm.

7 is a graph showing the change in luminance according to the tensile rate of the fiber-type light emitting device according to an embodiment of the present specification.

Referring to FIG. 7 , in the fiber-type light emitting device 100 according to an embodiment of the present specification, both the core fiber 110 and the fiber-type electrode 120 are formed of a fiber material, and the polymer solution 130a is cured by By forming the electroluminescent layer 130 , stable light emission with little change in luminance is possible even when a tensile rate of 100% or more is applied.

In particular, it was confirmed that the fiber-type light emitting device 100 according to an embodiment of the present specification maintains the luminous efficiency even in a tensile test repeated 300 times or more.

Although the embodiments of the present specification have been described in more detail with reference to the accompanying drawings, the present specification is not necessarily limited to these embodiments, and various modifications may be made within the scope without departing from the technical spirit of the present specification. . Accordingly, the embodiments disclosed in the present specification are for explanation rather than limiting the technical spirit of the present specification, and the scope of the technical spirit of the present specification is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present specification should be construed by the claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present specification.

100: fiber type light emitting device
110: core fiber
120: fiber-type electrode
130: electroluminescent layer
130a: polymer solution
140: cylindrical mold

Claims (19)

longitudinally extending cylindrical core fibers;
a plurality of cylindrical fibrous electrodes extending in a longitudinal direction parallel to the core fiber and disposed on an outer circumferential surface of the core fiber; and
A fiber-type light emitting device comprising a cylindrical electroluminescent layer surrounding the core fiber and the plurality of fiber-type electrodes.
According to claim 1,
The core fiber is
A fiber-type light emitting device made of flexible fibers.
According to claim 1,
The plurality of fibrous electrodes
A fiber-type light emitting device made of elastic fibers containing conductive nanoparticles.
According to claim 1,
The plurality of fibrous electrodes
A fiber-type light emitting device disposed to face each other in a radial direction of the core fiber.
According to claim 1,
The plurality of fiber electrodes
A fiber-type light emitting device disposed so that an acute angle formed with the center of the core fiber has an angle smaller than 180 degrees.
According to claim 1,
The electroluminescent layer is
A fiber-type light emitting device formed by curing a polymer solution in which a silicone-based polymer and electroluminescent powder are mixed.
7. The method of claim 6,
The silicone-based polymer is
A fiber-type light emitting device that is polydimethylsiloxane (PDMS) or Ecoflex.
7. The method of claim 6,
The electroluminescent powder is
consisting of at least one zinc sulfide (ZnS) component selected from the series ZnS:Cu, ZnS:Mn, ZnS:Cl, ZnS:Al, ZnS:I, ZnO:Al, ZnO:Cu, ZnO:Mn, and ZnS:Tb. A fiber-type light emitting device.
7. The method of claim 6,
The electroluminescent layer is
A fiber-type light emitting device in which the silicon-based polymer and the electroluminescent powder are mixed in a ratio of 50:50.
7. The method of claim 6,
The electroluminescent layer is
A fiber-type light emitting device formed by curing the polymer solution at room temperature for 3 to 5 hours.
According to claim 1,
The electroluminescent layer is
A fiber-type light emitting device formed in a size of 1 mm or less in diameter.
forming a core fiber;
coupling a plurality of fibrous electrodes to an outer circumferential surface of the core fiber;
disposing the core fiber to which the plurality of fibrous electrodes are coupled in a cylindrical mold;
mixing the polymer and the electroluminescent powder to form a polymer solution;
injecting the polymer solution into a space within the cylindrical mold; and
and curing the polymer solution to form an electroluminescent layer.
13. The method of claim 12,
The plurality of fibrous electrodes
A method of manufacturing a fiber-type light emitting device disposed to face the core fiber in a radial direction.
13. The method of claim 12,
The plurality of fiber electrodes
A method of manufacturing a fiber-type light emitting device disposed so that an acute angle formed with the center of the core fiber has an angle smaller than 180 degrees.
13. The method of claim 12,
The polymer is
A method of manufacturing a fiber-type light emitting device that is polydimethylsiloxane (PDMS) or Ecoflex.
13. The method of claim 12,
The electroluminescent powder is
consisting of at least one zinc sulfide (ZnS) component selected from the series ZnS:Cu, ZnS:Mn, ZnS:Cl, ZnS:Al, ZnS:I, ZnO:Al, ZnO:Cu, ZnO:Mn, and ZnS:Tb. A method for manufacturing a fiber-type light emitting device.
13. The method of claim 12,
The polymer solution is
A method of manufacturing a fiber-type light emitting device in which the polymer and the electroluminescent powder are mixed in a ratio of 50:50.
13. The method of claim 12,
The electroluminescent layer is
A method of manufacturing a fiber-type light emitting device formed by curing the polymer solution at room temperature for 3 to 5 hours.
13. The method of claim 12,
The cylindrical mold is
A method of manufacturing a fiber-type light emitting device having an inner diameter of 1 mm or less.

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