JP2021125350A - Band-shaped light emitter, light emitting device, and manufacturing method of band-shaped light emitter - Google Patents

Abstract

To provide a band-shaped light emitter that can easily emit light in the entire length direction of a light emitting layer even when the light emitter is formed in a long band shape.SOLUTION: A band-shaped light emitter 10 is formed by laminating a first electrode layer 101, an insulating layer 102, a light emitting layer 103, and a second electrode layer 104 each of which has a band shape in this order. The first electrode layer 101 is made of a metal foil. The second electrode layer 104 is made of a metal foil and overlaps a part of the light emitting layer 103 in the width direction of the light emitting layer 103. The light emitting layer 103 is composed of inorganic electroluminescence. A transparent electrode layer 105 overlaps a portion of the light emitting layer 103 where the second electrode layer 104 does not overlap.SELECTED DRAWING: Figure 1

Description

The present invention relates to a band-shaped light emitting body formed by forming a light emitting body in a band shape, and a light emitting device including the band-shaped light emitting body. The present invention also relates to a method for producing a band-shaped illuminant.

Patent Document 1 describes a flexible light emitting device having a light emitting body layer in which a first electrode, a light emitting layer (organic EL layer), and a second electrode are laminated in this order on a long strip-shaped base material. Has been done. In the light emitting body layer, in order to extract light emitted from the light emitting layer from the first electrode side, the first electrode is a so-called transparent electrode and is formed of a highly translucent material such as iridium tin oxide (ITO). Will be done.

JP-A-2017-69003

A transparent electrode is a kind of compound semiconductor and tends to be inferior in conductivity to a metal. Therefore, when the base material, that is, the flexible light emitting device is formed into a long band shape, the electric resistance of the first electrode, which is a transparent electrode, becomes large and it becomes difficult for current to flow, and it is difficult to emit light in the entire length direction of the light emitting layer. Can be.

Therefore, an object of the present invention is to provide a band-shaped light emitting body that easily emits light in the entire length direction of the light emitting layer even if it is formed in a long band shape, and a light emitting device including the band-shaped light emitting body.

A first aspect of the present invention relates to a band-shaped illuminant in which a first electrode layer, an insulating layer, a light emitting layer, and a second electrode layer, each having a band shape, are laminated in this order. In the band-shaped light emitter according to this aspect, the first electrode layer is made of a metal foil. Further, the second electrode layer is made of a metal foil and overlaps a part of the light emitting layer in the width direction of the light emitting layer.

According to the band-shaped illuminant according to the present aspect, even if the band-shaped illuminant is formed into a long band, the entire length direction of the light emitting layer is likely to emit light. Moreover, light can be emitted from the side of the light emitting layer where the second electrode layer is provided to the outside through the portion where the second electrode layers do not overlap.

In the band-shaped illuminant according to this embodiment, the light emitting layer may be composed of inorganic electroluminescence.

According to the above configuration, the flexibility of the band-shaped illuminant in the thickness direction can be increased.

The band-shaped illuminant according to the present embodiment may be configured to further include a transparent electrode layer that overlaps the portion of the light emitting layer where the second electrode layer does not overlap.

According to the above configuration, the entire portion where the second electrode layer does not overlap in the width direction of the light emitting layer is likely to emit light.

In the band-shaped light emitting body according to the present embodiment, the second electrode layer is one, and the one second electrode layer is configured to overlap the intermediate portion of the light emitting layer in the width direction of the light emitting layer. obtain.

According to the above configuration, since the second electrode layer is separated from the end in the width direction of the band-shaped illuminant, the second electrode layer is damaged when the band-shaped illuminant is attached to the attachment and used. It becomes difficult to receive.

The band-shaped illuminant according to the present embodiment may be configured such that a plurality of notches or notches are formed at at least one end in the width direction so as to line up in the length direction.

According to the above configuration, the flexibility of the band-shaped illuminant in the width direction can be increased.

In the band-shaped light emitting body according to this embodiment, the second electrode layer is two, and the two second electrode layers are configured to overlap both ends of the light emitting layer in the width direction of the light emitting layer. Can be.

According to the above configuration, the light emitted from the light emitting layer is emitted as one wide light without being divided by the second electrode layer.

In the band-shaped luminescent material according to this embodiment, a configuration may be adopted in which an adhesive layer is formed on the side opposite to the light emitting layer with respect to the first electrode layer.

According to the above configuration, the band-shaped illuminant can be fixed to the object to be attached without applying an adhesive.

A second aspect of the present invention relates to a light emitting device. The light emitting device according to this aspect includes a band-shaped light emitting body according to the first aspect and a power supply device for supplying electric power to the band-shaped light emitting body.

According to the light emitting device according to the present aspect, the same effect as that of the band-shaped light emitting body according to the first aspect can be obtained.

A third aspect of the present invention relates to a method for producing a band-shaped illuminant. In the manufacturing method according to this aspect, a band-shaped first electrode layer is formed of a metal foil, a band-shaped insulating layer is formed so as to overlap the first electrode layer, and a band-shaped light emitting layer is formed so as to overlap the insulating layer. A metal foil is attached so as to overlap a part of the light emitting layer in the width direction of the light emitting layer to form a band-shaped second electrode layer.

According to the above manufacturing method, it is possible to easily manufacture a band-shaped illuminant that easily emits light in the entire length direction of the light emitting layer even if it is formed in a long band shape.

As described above, according to the present invention, it is possible to provide a band-shaped light emitting body that easily emits light in the entire length direction of the light emitting layer even if it is formed in a long band shape, and a light emitting device including the band-shaped light emitting body.

The effects or significance of the present invention will be further clarified by the description of the embodiments shown below. However, the embodiments shown below are merely examples when the present invention is put into practice, and the present invention is not limited to those described in the following embodiments.

FIG. 1A is a diagram showing a configuration of a light emitting device according to an embodiment, and FIG. 1B is a schematic cross section of a band-shaped light emitting body cut in the width direction according to the embodiment. It is a figure. FIG. 2 is a diagram showing a procedure for manufacturing a band-shaped illuminant according to an embodiment. FIG. 3A is a plan view of the band-shaped illuminant according to the modified example, and FIG. 3B is a schematic cross-sectional view of the strip-shaped illuminant cut in the width direction according to the modified example. .. 4 (a) to 4 (c) are diagrams showing the configuration of a band-shaped illuminant according to other modified examples.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1A is a diagram showing the configuration of a light emitting device 1, and FIG. 1B is a schematic cross-sectional view of a band-shaped light emitting body 10 cut in the width direction. In FIG. 1A, for convenience, the band-shaped illuminant 10 is drawn so that the portion of the first electrode layer 101 connected to the power line 21 is exposed. Further, in FIG. 1A, diagonal lines are provided in order to clearly indicate the first electrode layer 101 and the second electrode layer 104.

The band-shaped illuminant 10 is formed in an elongated rectangular thin plate shape, that is, in a band shape, and has flexibility in the thickness direction. A power supply device 20 is connected to the band-shaped illuminant 10, and the band-shaped illuminant 10 emits surface light by supplying power from the power supply device 20. The light emitting device 1 is composed of the band-shaped light emitting body 10 and the power supply device 20.

The band-shaped illuminant 10 may have a width of 20 mm or less, and a length of several hundred mm to several thousand mm. For example, the width of the band-shaped illuminant 10 can be about 10 mm or about 5 mm.

The band-shaped illuminant 10 includes a first electrode layer 101 having a band shape, an insulating layer 102, a light emitting layer 103, a second electrode layer 104, a transparent electrode layer 105, and a coating layer 106.

The first electrode layer 101 is made of a metal foil such as a copper foil or an aluminum foil, and has better conductivity than the transparent electrode layer 105. The entire outer surface of the first electrode layer 101, that is, both surfaces, both end faces in the width direction and both end faces in the length direction, is covered with the insulator 107. The insulator 107 is made of, for example, polyethylene terephthalate (PET). The insulator 107 may be transparent, but when it is colored in white, fluorescent white, or a color close to these, the luminescence of the band-shaped illuminant 10 can be increased.

The light emitting layer 103 is composed of inorganic electroluminescence (inorganic EL). The light emitting layer 103 has substantially the same width as the first electrode layer 101, and overlaps the first electrode layer 101 via an insulator 107. The portion of the insulator 107 interposed between the first electrode layer 101 and the light emitting layer 103 becomes the insulating layer 102.

The second electrode layer 104 is made of a metal foil such as a copper foil or an aluminum foil, and has better conductivity than the transparent electrode layer 105. The second electrode layer 104 has a width smaller than that of the first electrode layer 101 and the light emitting layer 103, for example, about one-fifth, and overlaps the central portion of the light emitting layer 103 in the width direction. The second electrode layer 104 may overlap the portion of the light emitting layer 103 that is displaced in the left-right direction from the central portion.

The transparent electrode layer 105 is made of, for example, iridium tin oxide (ITO) and is provided on both the left and right sides of the second electrode layer 104. The two transparent electrode layers 105 overlap the portion of the light emitting layer 103 where the second electrode layer 104 does not overlap in the width direction. Each transparent electrode layer 105 comes into contact with the second electrode layer 104.

The thickness of the first electrode layer 101, the insulating layer 102, the second electrode layer 104, and the transparent electrode layer 105 is, for example, about 0.01 mm, and the thickness of the light emitting layer 103 is, for example, about 0.05 mm.

The coating layer 106 is constructed by coating a material having insulating properties and flexibility, for example, urethane. The coating layer 106 covers the surface of the block composed of the light emitting layer 103, the second electrode layer 104, and the two transparent electrode layers 105, both end faces in the width direction, and both end faces in the length direction, and is connected to the insulator 107. The surface of the band-shaped illuminant 10 on the coating layer 106 side is the light emitting surface. Therefore, the coating layer 106 is made transparent so that light can be transmitted. The coating layer 106 may be made of a film of fluorine or polyethylene terephthalate.

An adhesive layer 108 is formed on the surface of the insulator 107 opposite to the surface on the light emitting layer 103 side by applying an adhesive. A release paper 109 is attached to the adhesive layer 108. The surface of the band-shaped illuminant 10 on the adhesive layer 108 side is the mounting surface.

The power supply device 20 has a built-in battery, a booster circuit, and an inverter circuit. The power supply device 20 boosts the DC voltage from the battery, converts it into an AC voltage, and outputs the AC voltage. The AC voltage output from the power supply device 20 has a frequency in the range of 60 Hz to 2 kHz and a voltage in the range of 60 V to 200 V, and is set according to the brightness required on the band-shaped light emitter 10 side. A pair of power lines 21 from the power supply device 20 are connected to the first electrode layer 101 and the second electrode layer 104 of the band-shaped illuminant 10.

The user can use the band-shaped illuminant 10 by attaching it to a desired object to be attached. When the band-shaped illuminant 10 is attached to the attached object, the release paper 109 is peeled off and the adhesive layer 108 is adhered to the attached object. As a result, the band-shaped illuminant 10 can be fixed to the object to be attached without applying an adhesive. Further, if necessary, the user can cut the band-shaped illuminant 10 to a desired length by using scissors or a cutter before mounting on the object to be mounted.

When the band-shaped illuminant 10 is made to emit light, an AC voltage from the power supply device 20 is applied to the first electrode layer 101 and the second electrode layer 104 of the band-shaped illuminant 10. An alternating current flows through the first electrode layer 101 and the second electrode layer 104, and an alternating current flows through the second electrode layer 104 through the two transparent electrode layers 105. As a result, the light emitting layer 103, which is an inorganic EL layer, emits light. The light emitted from the light emitting layer 103 passes through the transparent electrode layer 105 and the coating layer 106 and is emitted to the outside. As a result, the light emitting surface of the band-shaped light emitter 10 emits light.

Here, the first electrode layer 101 and the second electrode layer 104 are made of a metal foil, and are more conductive than the transparent electrode layer 105. Therefore, even if the band-shaped illuminant 10 is lengthened, an appropriate amount of current is likely to flow in the entire length direction of the light emitting layer 103, and the entire length direction of the light emitting layer 103 is likely to emit light. Further, since the transparent electrode layer 105 is overlapped on the left side portion and the left side portion on which the second electrode layer 104 of the light emitting layer 103 is not overlapped, a current easily flows to both ends of the light emitting layer 103 in the width direction, and the light emitting layer. 103 is easy to emit light to both ends. Further, since the second electrode layer 104 only overlaps a part of the light emitting layer 103 and the transparent electrode layer 105 overlaps the remaining part of the light emitting layer 103, the light emitting layer 103 is passed through the transparent electrode layer 105. Light can be emitted from the side where the second electrode layer 104 is provided to the outside.

The band-shaped light emitter 10 can prevent the occurrence of a short circuit between the first electrode layer 101 and the second electrode layer 104 when an AC voltage is applied by the insulating layer 102. Further, in the band-shaped light emitter 10, a laminated block composed of a first electrode layer 101, an insulating layer 102, a light emitting layer 103, a second electrode layer 104, and two transparent electrode layers 105 is coated with a coating layer 106 and an insulator 107. Therefore, it is possible to prevent an electric shock caused by the user touching the energized portion.

Next, a method for producing the band-shaped illuminant 10 will be described.

FIG. 2 is a diagram showing a procedure for manufacturing the band-shaped illuminant 10.

With reference to FIG. 2, first, the band-shaped first electrode layer 101 formed of the metal foil is covered with an insulator 107 to form a band-shaped insulating layer 102 that overlaps with the first electrode layer 101. Next, by applying a light emitting material such as an inorganic EL to the surface of the insulating layer 102, a band-shaped light emitting layer 103 that overlaps the entire insulating layer 102 is formed.

Next, by mounting a metal foil narrower than the first electrode layer 101 on the surface of the central portion in the width direction of the light emitting layer 103, a band-shaped second electrode that overlaps the central portion that is a part of the light emitting layer 103. The layer 104 is formed. Next, by applying a transparent electrode material such as ITO on the left and right sides of the second electrode layer 104 on the surface of the light emitting layer 103, two overlapping portions of the second electrode layer 104 of the light emitting layer 103 do not overlap. A band-shaped transparent electrode layer 105 is formed.

Next, the coating layer 106 is formed by applying a material such as urethane so as to cover the periphery of the light emitting layer 103, the second electrode layer 104, and the two transparent electrode layers 105. Finally, an adhesive is applied to the surface of the first electrode layer 101 opposite to the insulating layer 102 side to form the adhesive layer 108, and then the release paper 109 is attached to the adhesive layer 108.

In this way, the band-shaped illuminant 10 is completed.

The step of forming the adhesive layer 108 and attaching the release paper 109 to the adhesive layer 108 may be performed before the step of forming the light emitting layer 103.

<Effect of embodiment>
According to this embodiment, the following effects can be achieved.

Since the second electrode layer 104 is made of a metal foil and overlaps a part of the light emitting layer 103 in the width direction of the light emitting layer 103, the band-shaped light emitting body 10 has a long band shape. Even if it is formed in the above direction, the entire light emitting layer 103 in the length direction tends to emit light. Moreover, light can be emitted from the side of the light emitting layer 103 where the second electrode layer 104 is provided to the outside through the portion where the second electrode layer 104 does not overlap.

Further, since the light emitting layer 103 is composed of inorganic electroluminescence, the flexibility of the band-shaped light emitting body 10 in the thickness direction can be increased.

Further, since the band-shaped light emitting body 10 includes the transparent electrode layer 105 that overlaps the portion where the second electrode layer 104 of the light emitting layer 103 does not overlap, the light emitting layer 103 easily emits light to both ends in the width direction thereof. That is, the entire portion where the second electrode layer 104 does not overlap in the width direction of the light emitting layer 103 is likely to emit light.

Further, since the band-shaped illuminant 10 is configured such that one second electrode layer 104 overlaps the intermediate portion, for example, the central portion of the light emitting layer 103 in the width direction of the light emitting layer 103, the second electrode layer 104 Is provided away from the end of the band-shaped illuminant 10 in the width direction, and the band-shaped illuminant 10 is attached to the object to be attached and used as compared with the case where the second electrode layer 104 is provided at the end. Occasionally, the second electrode layer 104 is less likely to be damaged.

Further, since the band-shaped light emitting body 10 is provided with the adhesive layer 108 on the side opposite to the light emitting layer 103 with respect to the first electrode layer 101, the band-shaped light emitting body 10 is attached without applying an adhesive. Can be fixed to an object.

Further, since the first electrode layer 101 and the second electrode layer 104 are formed only by arranging the metal foil, the case where the first electrode layer 101 and the second electrode layer 104 are formed by applying the electrode material is compared with the case where the first electrode layer 101 and the second electrode layer 104 are formed. Therefore, the band-shaped illuminant 10 can be easily manufactured.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and the embodiments of the present invention can be modified in various ways other than the above. ..

<Change example>
FIG. 3A is a plan view of the band-shaped illuminant 10A according to the modified example, and FIG. 3B is a schematic cross-sectional view of the strip-shaped illuminant 10A cut in the width direction according to the modified example. Is. In FIG. 3A, diagonal lines are provided in order to clearly indicate the two second electrode layers 110.

The band-shaped light emitter 10A of the present modification includes two second electrode layers 110 and one transparent electrode layer 111 arranged between the second electrode layers 110. Each second electrode layer 110 is made of a metal foil such as copper foil or aluminum foil, and the transparent electrode layer 111 is made of iridium tin oxide (ITO) or the like. Other configurations of the band-shaped illuminant 10A are the same as the configuration of the band-shaped illuminant 10 of the above-described embodiment.

The widths of the two second electrode layers 110 are the same, and their width is set to half the width of the second electrode layer 104 of the above embodiment. That is, the combined width of the two second electrode layers 110 is the same as the width of the second electrode layer 104 of the above embodiment. The two second electrode layers 110 overlap both ends of the light emitting layer 103 in the width direction of the light emitting layer 103, and the transparent electrode layer 111 overlaps the portion of the light emitting layer 103 between the two second electrode layers 110. ..

In the band-shaped light emitting body 10A of this modified example, since the second electrode layer 110 is divided into two and exists at both ends of the light emitting layer 103, the light emitted from the light emitting layer 103 is divided by the second electrode layer 110. It is emitted as one wide light without being emitted.

In the above embodiment, the band-shaped light emitting body 10 of the light emitting device 1 can be replaced with the band-shaped light emitting body 10A. In this case, one power line 21 is branched and connected to each of the two second electrode layers 110. The band-shaped illuminant 10A may be configured such that two second electrode layers 110 are coupled to the end portion to which the power line 21 is connected, and the power line 21 is connected to the coupled portion. In this configuration, the power line 21 does not have to be branched.

The band-shaped illuminant 10A of this modified example is also manufactured by the same manufacturing method as that of the above embodiment.

<Other changes>
As shown in FIG. 4A, in the band-shaped illuminant 10 of the above embodiment, a plurality of V-shaped notches 112 are formed at both ends in the width direction so as to be lined up in the length direction. You may. Alternatively, as shown in FIG. 4B, a plurality of linear notches 113 may be formed at both ends of the band-shaped illuminant 10 in the width direction so as to be arranged in the length direction.

With such a configuration, the flexibility of the band-shaped illuminant 10 in the width direction can be increased, so that the band-shaped illuminant 10 is bent in an arc in the width direction or meanders in an S shape. Can be made to. This makes it easier to mount the band-shaped illuminant 10 according to the shape of the object to be mounted.

The notch 112 may have another shape such as a U shape instead of a V shape. Further, the plurality of notches 112 and notches 113 may be formed only at one end of the band-shaped illuminant 10 instead of at both ends.

Further, as shown in FIG. 4C, in the band-shaped light emitting body 10 of the above embodiment, the first electrode layer 101 is not covered with the insulator 107, but the first electrode layer 101 and the light emitting layer 103. An insulating layer 114 is formed between them, and a laminated block composed of a first electrode layer 101, an insulating layer 114, a light emitting layer 103, a second electrode layer 104, and two transparent electrode layers 105 is entirely covered with a coating layer 115 on the outside. Such a configuration may be adopted. Further, the band-shaped illuminant 10A of the above modified example may also have a configuration including an insulating layer 114 and a coating layer 115, as in FIG. 4C.

The band-shaped illuminant 10 shown in FIGS. 4A to 4C is also manufactured by the same manufacturing method as that of the above embodiment.

Further, in the above embodiment, the light emitting layer 103 is composed of an inorganic EL. However, the light emitting layer 103 may be composed of electroluminescence other than inorganic EL, for example, electroluminescence in which inorganic EL and organic EL are mixed.

Further, the band-shaped light emitting body 10 may be changed to a structure in which three or more second electrode layers are overlapped with the light emitting layer 103 at predetermined intervals in the width direction of the light emitting layer 103. Also in this configuration, the transparent electrode layer is arranged between the adjacent second electrode layers, and the light from the light emitting layer 103 is transmitted through the transparent electrode layer.

Further, when the width of the light emitting layer 103 is narrow, the configuration of the band-shaped light emitting body 10 may be changed so that only the second electrode layer 104 overlapping the one end of the light emitting layer 103 is provided. Further, if the width of the light emitting layer 103 is narrow and the entire portion of the light emitting layer 103 where the second electrode layer 104 does not overlap can emit light due to the current flowing through the second electrode layer 104, the transparent electrode layer 105 is not provided. In addition, the configuration of the band-shaped illuminant 10 may be changed.

In addition, the embodiments of the present invention can be appropriately modified within the scope of the claims.

1 Light emitting device 10 Band-shaped light emitter 20 Power supply device 10A Band-shaped light emitting body 101 1st electrode layer 102 Insulation layer 103 Light emitting layer 104 2nd electrode layer 105 Transparent electrode layer 108 Adhesive layer 110 2nd electrode layer 111 Transparent electrode layer 112 Notch 113 Notch 114 Insulation layer

Claims (9)

A band-shaped illuminant obtained by laminating a first electrode layer, an insulating layer, a light emitting layer, and a second electrode layer, each of which has a band shape, in this order.
The first electrode layer is made of a metal foil.
The second electrode layer is made of a metal foil and overlaps a part of the light emitting layer in the width direction of the light emitting layer.
A band-shaped illuminant characterized by this. In the band-shaped illuminant according to claim 1,
The light emitting layer is composed of inorganic electroluminescence.
A band-shaped illuminant characterized by this. In the band-shaped illuminant according to claim 1 or 2,
A transparent electrode layer that overlaps the portion of the light emitting layer where the second electrode layer does not overlap is further provided.
A band-shaped illuminant characterized by this. In the band-shaped illuminant according to any one of claims 1 to 3,
The second electrode layer is one,
The one second electrode layer overlaps the intermediate portion of the light emitting layer in the width direction of the light emitting layer.
A band-shaped illuminant characterized by this. In the band-shaped illuminant according to any one of claims 1 to 4,
Multiple notches or notches are formed at at least one end in the width direction so as to line up in the length direction.
A band-shaped illuminant characterized by this. In the band-shaped illuminant according to any one of claims 1 to 3,
The second electrode layer is two.
The two second electrode layers overlap both ends of the light emitting layer in the width direction of the light emitting layer.
A band-shaped illuminant characterized by this. In the band-shaped illuminant according to any one of claims 1 to 6,
An adhesive layer is formed on the side opposite to the light emitting layer with respect to the first electrode layer.
A band-shaped illuminant characterized by this. The band-shaped illuminant according to any one of claims 1 to 7.
A power supply device that supplies electric power to the band-shaped illuminant,
A light emitting device comprising. A band-shaped first electrode layer is formed from the metal foil,
A band-shaped insulating layer is formed so as to overlap the first electrode layer.
A band-shaped light emitting layer is formed so as to overlap the insulating layer.
A metal foil is attached so as to overlap a part of the light emitting layer in the width direction of the light emitting layer to form a band-shaped second electrode layer.
A method for producing a band-shaped illuminant.

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