JPH02204995A - Electroluminescence and manufacture thereof - Google Patents

Abstract

PURPOSE:To have electroluminescence with less deterioration of light-emitting layer and unevenness in light emission, wherein the non-light emission part is transparent, by arranging an unevenness absorbing member between No.2 transparent electrode and No.2 transparent base board. CONSTITUTION:On No.1 transparent electrode 12 a light emitting layer 14 is formed by printing in the form corresponding to the desired light emission pattern. In regions other than this light emitting layer 14 a transparent insulative layer 16 is formed by printing in a thickness approx. the same as the light emitting layer 14. Thereover No.2 transparent electrode 20 and a PET film (polyester resin film as clear element for absorption of unevenness) 24 are laminated, and further thereover a clear thermoplastic adhesive is coated for adhesion of No.2 transparent base board 18. Accordingly the unevenness on the No.2 transparent electrode 20 is absorbed by the PET film 24, so that pressure contacting of the No.2 transparent electrode 20 with the light emitting layer and transparent insulative layer can be made with free deformation in compliance with the surface configuration of the light emitting layer 14 and transparent insulative layer 16.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electroluminescent device having a light-emitting layer that emits light when an electric field is generated, and a method for manufacturing the same.

[Conventional technology]

When trying to obtain a desired light emission pattern in the electroluminescence described above, there is a method of disposing a light-shielding film with the light-emitting pattern cut out in the electroluminescence. This has the disadvantage of having to emit light unnecessarily, leading to wasted power. Therefore, in the past, the back electrode was etched into a shape corresponding to the above-mentioned light emission pattern.
Measures have been taken to flow current only to the desired light-emitting region.

However, recently, the transparency of non-light-emitting parts has become more important. In other words, by making the area other than the light-emitting part transparent, the opaque light-emitting layer stands out even when electroluminescence is off, making it possible to display characters, figures, etc., and when it is turned on, it becomes even more impactful. This gives rise to the advantage of being given. Such a structure is effective when attached to a window glass or the like.

Therefore, in recent years, electroluminescent manufacturing methods as shown in FIGS. 9 to 14 have been proposed.

First, as shown in FIGS. 9(a) and 9(b), ITO (In203
．． A first transparent electrode 12 made of 5n03) or the like is deposited, and a lead wire 11 as shown in FIGS. 10(a) and 10(b) is provided on this first transparent electrode 12. Next, the 11th
As shown in FIGS. 12(a) and 12(b), a light-emitting layer 14 is printed in a desired shape on the surface of the first transparent electrode 12, and a portion around this light-emitting layer 14 is printed as shown in FIG. Print the transparent insulating layer 16 shown in (b). On the other hand, the above figure 10 (
a) In the same manner as shown in (b), a second transparent electrode 20 is deposited on a second transparent substrate 18 as shown in FIG. 13, and this second transparent electrode 20 and the light-emitting layer 14 and the transparent insulating layer 16 facing each other, the non-light-emitting portions as shown in FIGS. can produce transparent electroluminescence.

Note that the second transparent electrode 20 is deposited on the second transparent substrate 18 side in the above process because, for example, when the second transparent electrode 20 is deposited on the light emitting layer 14 side, the molecules constituting the second transparent electrode 20 are deposited on the light emitting layer 14 side. The light emitting layer 14 passes through a pinhole formed in the
This is because there is an inconvenience that the second transparent electrode 20 passes through, and if the second transparent electrode 20 is arranged by printing, there is an inconvenience that the layer thickness of the transparent electrode 20 increases and the transparency decreases.

In addition to such a manufacturing method, for example, Japanese Patent Application Laid-Open No. 57-2025
Japanese Patent No. 91 discloses a method in which an insulating film having a through hole of a desired shape is attached to the first transparent electrode, and a light emitting layer 14 is applied inside the through hole.

[Problem to be solved by the invention]

In the manufacturing process shown in the above drawings and publications, the surface of the light emitting layer 14 disposed on the first transparent electrode 12 and the surface of the second transparent electrode 20 disposed on the second transparent substrate 18 are formed with minute irregularities 141 and 2.01 as shown in FIG. 15, respectively. Therefore, as shown in the figure, when the light emitting layer 14 and the transparent insulating layer 16 are in contact with the second transparent electrode 20, a gap +1122 is created between them. Moreover, since the second transparent electrode 2o cannot be deformed to protrude toward the hard transparent substrate 18 side, the gap 22 cannot be eliminated even if the two are brought into pressure contact. Such a gap 22 may cause uneven light emission or the light emitting layer 14.
It is easy to cause deterioration, and its removal is a challenge. This also applies to the space between the transparent insulating layer 16 and the second transparent electrode 20.

In addition, as a means for removing the gap 22, it is possible to absorb the unevenness 141° 201 by increasing the heating temperature during pressure bonding and partially melting and deforming the second transparent electrode 20. Since the transparent conductive material constituting the transparent electrode 20 has a relatively high melting point, the unevenness 141, 2
There is a possibility that the binder of the light-emitting element in the light-emitting layer 14 and the transparent insulating layer 16 may undergo thermal decomposition before absorbing 01.

In view of these circumstances, the present invention provides an electroluminescence device whose non-light emitting portion is transparent and which can eliminate the gap between the light emitting layer, the transparent insulating layer, and the transparent 1U electrode without any inconvenience, and its manufacturing method. The purpose is to provide.

[Means to solve the problem]

The present invention includes a first transparent substrate, a first transparent electrode, a light-emitting layer arranged in a desired shape, and a light-emitting layer having a thickness substantially equal to that of the light-emitting layer and arranged around the light-emitting layer. a transparent insulating layer;
An electroluminescent manufacturing method in which a second transparent electrode and a second transparent substrate are sequentially laminated, the first transparent electrode being vapor-deposited on the first transparent substrate, and the first transparent electrode being deposited on the first transparent electrode. A light-emitting layer is provided in a desired shape, and a transparent insulating layer is provided around the light-emitting layer with a thickness substantially equal to that of the light-emitting layer, while a second transparent insulating layer is provided on one surface of the uneven absorber. The electrode is vaporized, the other surface is brought into contact with a second transparent substrate, and then the light emitting layer and transparent insulating layer are fixed in a pressure-contact state with the second transparent electrode.

The present invention also provides a first transparent substrate, a first transparent electrode,
A light-emitting layer disposed in a desired shape, a transparent insulating layer having a thickness substantially equal to that of the light-emitting layer and disposed around the light-emitting layer, a second transparent electrode, and a second transparent substrate. Laminated sequentially. In electroluminescence, a transparent uneven absorber is disposed between the second transparent electrode and the second transparent substrate.

[For production]

According to the above configuration, since the unevenness of the second transparent electrode is absorbed by the unevenness absorber, the second transparent electrode emits light when the light emitting layer and the transparent insulating layer are brought into pressure contact with the second transparent electrode. It can be freely deformed depending on the surface shape of the layer and the transparent insulating layer. Therefore, the gap between the two is removed without applying large pressure or temperature.

〔Example〕

An example of the electroluminescence manufacturing method of the present invention will be explained based on FIGS. 1 to 8. Components that are equivalent to those shown in FIGS. 9 to 15 above are given the same reference numerals.

First, as shown in FIGS. 1(a) and 1(b), a first transparent electrode 12 that provides light transmission is deposited on one side of a first transparent substrate 10 made of glass or the like. transparent electrode 1
Connect the lead wire 11 to 2. The first transparent electrode 12
is the above-mentioned ITO and tin dioxide (SnO2)
It is preferable to attach a transparent conductive material such as the above to the first transparent substrate 10 by vapor deposition or sputtering at a temperature of 400 to 500°C.

Next, as shown in FIGS. 2(a) and (b), the first
A light emitting layer 14 is arranged on the transparent electrode 12 by printing in a shape corresponding to a desired light emitting pattern. The light-emitting layer 14 is preferably one in which phosphor particles such as zinc sulfide (ZnS) are disposed in a suitable binder, and the thickness is preferably about 40 mm.

In a region other than the area where the light emitting layer 14 is provided, a transparent insulating layer 16 is provided by printing to a thickness substantially equal to that of the light emitting layer 14 in the same manner as the light emitting layer 14 described above (see FIG. 3(a)). b))
. The transparent insulating layer 16 is preferably made of transparent silicon, fluororesin, or a festival shade, but any material may be used as long as it is transparent and does not affect the light emitting layer 14 or the like.

On the other hand, as shown in FIGS. 4(a) and 4(b), the first transparent electrode 12 is formed on one side of a PET film (polyester resin film; transparent uneven absorber) 24.
A second transparent electrode 20 similar to the above is deposited, and a lead wire 26 is connected to this. Note that the uneven absorber in the present invention is not limited to the above-mentioned PET film 24, but may be made of other transparent synthetic resins, etc., but it requires a certain degree of heat resistance and ease of vapor deposition of the second transparent electrode 20. Specifically, polycarbonate, PES (polyethersulfone), etc. are applicable.

Next, what is shown in FIGS. 4(a) and 4(b) above is
As shown in the figure, the second transparent electrode 20, the light emitting layer 14 and the transparent insulating layer 16 are placed on top of those shown in FIGS. 3(a) and 3(b) while facing each other, Furthermore, the PET substrate 18 is bonded.

By heating and pressurizing this state at approximately 50 to 200°C and 1 to 3 atm, the second transparent electrode 20, the light emitting layer 14, and the transparent insulating layer 16 are brought into pressure contact (Fig. 6(a) )(b)). Then, by covering and fixing each of the four side faces (edges) with a fluorine-based adhesive or low melting point glass, it is possible to produce electroluminescence in which the portion other than the light emitting layer 14 is transparent.

FIGS. 7 and 8 show the states of the PET film 24, the second transparent electrode 20, and the light emitting layer 14 before and after heating and pressing, respectively.

As shown in FIG. 15 above, in a structure in which the second transparent electrode 20 is directly deposited on the second transparent substrate 18, the second transparent electrode 20 and the light emitting layer 14 are pressed against each other. However, since the second transparent substrate 18 is hard, the second transparent electrode 20 cannot be deformed, and the gap 22 between them cannot be removed.

On the other hand, if a soft PET film 24 is provided as shown in FIGS.
Since the unevenness of the second transparent electrode 20 is absorbed by the film 24, the second transparent electrode 20 is freely deformed along the unevenness of the light emitting layer 14.

Therefore, even by heating at a relatively low temperature and pressure, the gap formed between the light emitting layer 14 and the second transparent electrode 20 can be sufficiently removed, and the two can be brought into good pressure contact. . Needless to say, this also applies to the space between the transparent insulating layer 16 and the second transparent electrode 20.

From this point of view, the layer thickness of the PET film 24 is about 75 to 200 Jj! R is reasonable.

A suitable example of the use of the electroluminescence is, for example, use in place of red equilateral triangular stickers placed on windows of high-rise buildings. The above sticker indicates the area where firefighters can enter in case of a fire, but by substituting the above electroluminescence, the above mentioned area can be clearly displayed even when covered with fire smoke or at night. be able to.

Note that when such electroluminescence is used as a single-sided light emitter instead of a double-sided light emitter, a dielectric material such as barium titanate may be provided on the back side of the light emitting layer 14 by printing or the like. Since this dielectric material has light reflective properties, it is particularly effective when it is necessary to irradiate one side with strong light. Furthermore, by printing a material with high conductivity such as nickel or silver on the surface of the dielectric material layer, it is possible to suppress uneven light emission when the transparent electrode and the dielectric material are not in complete contact. .

Further, in the embodiment, the light emitting layer 14 and the transparent insulating layer 1
After placing the second transparent electrode 20 on the PET film 24, the second transparent substrate 18 is attached to the upper surface of the PET film 24. After adhesion, the second transparent electrode 20 may be placed on the light emitting layer 14 and the transparent insulating layer 16.

Further, in the above embodiment, the PET film 24, the second
The area of the transparent electrode 20 and the insulating layer 16 is made smaller than the area of the second transparent substrate 18, and this second transparent substrate 1
8 and the second transparent electrode 20 is allowed to flow to the surface of the first transparent electrode 12.
After the transparent electrode 20, the light emitting layer 14, and the insulating layer 16 are brought into pressure contact with each other, they can be fixed more reliably.

〔Effect of the invention〕

As described above, the present invention provides a second transparent electrode and a second transparent electrode.
An unevenness absorber is disposed between the ik plate and the unevenness absorber absorbs the unevenness generated on the second transparent electrode when the second transparent electrode is crimped with the light emitting layer and the transparent insulating layer. Therefore, the gap formed between the second transparent electrode and the light emitting layer and the transparent insulating layer can be removed by simply applying a slight pressure or temperature. It is possible to obtain electroluminescence in which the light-emitting portion is transparent and the light-emitting layer is less likely to deteriorate or have less uneven light emission.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are a plan view and a cross-sectional view showing the first transparent electrode deposited on the first transparent substrate, and FIG.
a) and (b) are plan views and cross-sectional views showing a state in which a light-emitting layer is disposed on the first transparent electrode, and FIGS. 4(a) and 4(b) are plan views and sectional views showing the state in which the second transparent electrode is deposited on the PET film, and FIG. 5 is the same as shown in FIG. 6(a) and 6(b) are cross-sectional views showing the components shown in a) and (b), those shown in FIGS. 4(a) and (b), and the second transparent substrate in the order of lamination. What is shown in Figures 3(a) and (b) and Figure 4(a) (
A plan view and a sectional view showing the state in which the material shown in b) and the second transparent substrate are laminated in order, and FIG. 7 shows the PE before crimping.
A cross-sectional view of the T film, the second transparent electrode, and the light-emitting layer, FIG. 8 is a cross-sectional view of the PET film after the pressure tube, the second transparent electrode, and the light-emitting layer, and FIGS. 9(a) and (b) are the cross-sectional views of the conventional electro A plan view and a cross-sectional view showing the state in which lead wires are attached to the first transparent substrate in the manufacturing process of luminescence, and FIG. 10 (
a) and (b) are a plan view and a cross-sectional view showing a state in which the first transparent electrode is deposited on the first transparent substrate, and FIG. 11(a)
12(b) is a plan view and a cross-sectional view showing a state in which a light-emitting layer is disposed on the first transparent electrode, and FIGS. 12(a) and 12(b) show a state in which a transparent insulating layer is disposed around the light-emitting layer. A plan view and a sectional view showing the state, and FIG. 13 shows the state before stacking the things shown in FIGS. 12(a) and (b) and those shown in FIGS. 9(a) and (b). 14(a) and 14(b) are a plan view and a sectional view showing an electroluminescent device manufactured by a conventional manufacturing process, and FIG. FIG. 3 is a cross-sectional view showing a gap formed therebetween. DESCRIPTION OF SYMBOLS 10... First transparent substrate, 12... First transparent electrode, 14... Light emitting layer, 16... Transparent insulating layer, 18...
- Second transparent substrate, 20... Second transparent electrode, 24.
...PET film (uneven absorber). Patent applicant Fukubi Chemical Industry Co., Ltd. Agent Patent attorney Etsushi Koharu Patent attorney Chief 1) Masamukai Patent attorney Takao Ito Figure 1 (a) (b) Figure 3 (a) (b) Figure 2 Figure 1゜Figure 4 (a) (b) (a) (b) Figure Figure (a) (b) ]2 Figure (a) (b) U Figure 1° (a) (b) Figure Figure Figure (a) (b) Figure (a) (b) Figure (a) (b) Z U Figure

Claims (2)

[Claims] 1. a first transparent substrate, a first transparent electrode, a light-emitting layer disposed in a desired shape, and a transparent insulating layer having approximately the same thickness as the light-emitting layer and disposed around the light-emitting layer; , second
A method for manufacturing electroluminescence in which a transparent electrode and a second transparent substrate are sequentially laminated, the first transparent electrode being vapor-deposited on the first transparent substrate, and the first transparent electrode emitting light on the first transparent electrode. The layer is arranged in a desired shape, and a transparent insulating layer is arranged around the light-emitting layer with a thickness substantially equal to that of the light-emitting layer, while a second transparent electrode is provided on one surface of the uneven absorber. A method for producing electroluminescence, which comprises: depositing the light emitting layer and the transparent insulating layer on the second transparent substrate, and then fixing the light emitting layer and the transparent insulating layer in pressure contact with the second transparent electrode. . 2. a first transparent substrate, a first transparent electrode, a light-emitting layer disposed in a desired shape, and a transparent insulating layer having approximately the same thickness as the light-emitting layer and disposed around the light-emitting layer; , second
An electroluminescent device in which a transparent electrode and a second transparent substrate are sequentially laminated, characterized in that a transparent uneven absorber is disposed between the second transparent electrode and the second transparent substrate. and electroluminescence.