JPH11195488A - El-pl composite element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an EL-PL composite element causing a phosphor to efficiently emit light so as to obtain light emission in full color by using the ultraviolet light emission of an EL element as an excitation light source. SOLUTION: An EL-PL composite element 1 is equipped with an Al electrode 3 parallel arranged on a substrate 2, an insulating film 4 formed on the Al electrode 3, a light emitting body layer 5 formed on the insulating film 4, an insulating film 6 formed on the light emitting body layer 5, plural belt-like ITO electrodes 7 parallel arranged orthogonal to the Al electrode 3 on the insulating film 6, plural belt-like phosphors 8 respectively arranged on the respective ITO electrodes 7. By applying a voltage between the ITO electrodes 7 and the Al electrode 3, ultraviolet light is emitted from the phosphor 5, and fluorescent is emitted from the phosphor 8 by the ultraviolet light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electroluminescence (EL) -photoluminescence (PL) composite device.

[0002]

2. Description of the Related Art Currently, CRTs are used in display devices.
Research and development of a thin and lightweight flat panel display that replaces is being actively conducted. Liquid crystal displays (LCD), thin-film electroluminescence (T)
FEL), a plasma display (PDP), a fluorescent display device (VFD), a light emitting diode (LED), a field emission display (FEDs), and the like. Among them, 15-inch and 33-inch full-color panels have been announced for liquid crystal displays and plasma displays.

The so-called double insulation structure disclosed by Sharp and Inoguchi et al. In 1974 solved the problems of low luminance and short life at once. Recently, it has been reported by Meiji University and Miura et al. That a strong ultraviolet light emission can be obtained in a thin film EL device using a ZnF ₂ host, and various applications as an ultraviolet surface light source are expected.

[0004]

The present inventors have developed an EL-PL composite device as one of the applications. The basic configuration of the EL-PL composite device is shown in FIG.
Two types are conceivable as shown in (a) and (b). FIG. 1A is a perspective view showing a first basic structure, and FIG. 1B is a perspective view showing a second basic structure.

As shown in FIG. 1A, a first element (21)
A plurality of strip-shaped Al electrodes (23) are formed on a glass substrate (22), and an insulating film (24) such as a-SiNx,
A light emitting layer (25) of F ₂ : Gd or the like and an insulating film (26) are formed in this order, and a plurality of strip-shaped transparent electrodes (27) such as ITO are formed on the insulating film (26) by an Al electrode (23). And a phosphor layer (28) is disposed on the transparent electrode (27). When a voltage is applied between the transparent electrode (27) and the Al electrode (23), the luminous body (25) emits ultraviolet light, and the phosphor (28) emits light using the ultraviolet light as an excitation light source. In this structure, light emission is observed through the transparent electrode (27). Thus, E
The L-PL composite element has a structure in which a phosphor is emitted using ultraviolet light emitted from a conventionally known EL element as an excitation light source.

As shown in FIG. 1B, the second element (31)
Has a structure in which light emission is observed through a glass substrate, and a plurality of strip-shaped transparent electrodes (37) are placed on the glass substrate (32).
Is formed thereon, and an insulating film (34) such as a-SiNx, Z
A light emitting layer (35) of nF ₂ : Gd or the like and an insulating film (36) are formed in this order, and a plurality of strip-shaped Al electrodes (3) are formed on the insulating film (36).
3) is formed orthogonal to the transparent electrode (37), and further the substrate (32)
The phosphor layer (38) is arranged on the lower surface. By applying a voltage between the transparent electrode (37) and the Al electrode (33),
(35) emits ultraviolet light, and the phosphor (38) emits light using the ultraviolet light as an excitation light source, and the emitted light is observed through the substrate (32).

The present inventors refer to the first structure as an inverted laminated structure, and the first inverted laminated structure is more preferable in terms of luminous efficiency than the second structure. The reason is,
In the case of the second structure, about 50% of the ultraviolet light emitted from the luminous body (35) is absorbed by the glass substrate (32),
This is because the luminous efficiency of the phosphor (38) is low, but in the case of the first reverse stacked structure, the ultraviolet light emitted from the luminous body (25) is only slightly absorbed by the transparent electrode (27). Therefore, the present inventors have aimed at further improving the luminous efficiency and achieving full color by using the first reverse stacked structure as a basic structure.

[0008] An object of the present invention is to provide an EL-light-emitting device that efficiently emits light from a phosphor using ultraviolet light emitted from an EL element as an excitation light source.
PL composite element, and EL capable of emitting full-color light
-To provide a PL composite device.

[0009]

In order to achieve the above object, an EL-PL composite device according to the present invention comprises a plurality of strip-shaped substrate-side electrodes arranged in parallel on a substrate, and a plurality of belt-like electrodes arranged on the substrate-side electrodes. The first insulating film formed, the light emitting layer formed on the first insulating film, the second insulating film formed on the light emitting layer, and the second insulating film are viewed in plan. A plurality of strip-shaped transparent electrodes arranged in parallel so as to intersect with the strip-shaped substrate-side electrode, and a plurality of phosphors arranged on these transparent electrodes, and between the transparent electrode and the substrate-side electrode. A voltage is applied to the light-emitting device to cause the light-emitting body to emit ultraviolet light, and the ultraviolet light causes the fluorescent material to emit fluorescence.

[0010] In the EL-PL composite device of the present invention, each phosphor is band-shaped, and may be disposed on each band-shaped transparent electrode.
It may have a substantially square shape, and may be arranged on the intersection of the strip-shaped substrate-side electrode and the strip-shaped transparent electrode, respectively, and the phosphors may be arranged in a mosaic shape as a whole.

In the EL-PL composite device of the present invention, it is preferable that a rib is formed between phosphors adjacent to each other. The ribs can prevent reflection of external light and improve contrast.

As described above, when each of the phosphors is in the form of a strip and is disposed on each of the strip-shaped transparent electrodes, the ribs are formed in a stripe shape. In addition, when each phosphor has a substantially square shape as described above and is arranged in a mosaic shape, the ribs may be formed in a stripe shape or in a cell shape. .

Further, in the EL-PL composite device of the present invention, it is preferable that the phosphor further has an ultraviolet reflecting film on the phosphor. By the ultraviolet reflecting film on the phosphor, the ultraviolet light from the luminous body that has once passed through the phosphor is reflected on the reflecting film surface and reenters the phosphor to excite the phosphor, thereby improving the brightness. Further, since ultraviolet rays do not come out from the upper surface of the element (usually, a glass plate), there is no influence of the ultraviolet rays on the human body.

In an EL-PL composite device in which ribs are formed between phosphors adjacent to each other and have an ultraviolet reflection film on the phosphors and the ribs, the luminance is improved by the action of the ultraviolet reflection film, and The ribs can prevent reflected ultraviolet light from entering the adjacent phosphor. Therefore, in the case of a full-color EL-PL composite device in which blue light-emitting phosphors, green light-emitting phosphors, and red light-emitting phosphors are arranged in a plane, color mixing is prevented. Further, even when the phosphor is monochromatic, a sharp image can be obtained.

Further, in the EL-PL composite device of the present invention, although not particularly limited, it is preferable that the luminous layer is made of ZnF ₂ : Gd. Strong ultraviolet light emission is obtained by ZnF ₂ : Gd.

Further, in the EL-PL composite device of the present invention, when the blue, green, and red light emitting phosphors are arranged in a plane as the phosphor, full-color light emission can be obtained.

In this case, although not particularly limited,
The light emitting layer is made of ZnF ₂ : Gd, the blue light emitting phosphor is made of BaMgAl ₁₄ O ₂₃ : Eu, the green light emitting phosphor is made of ZnS: Cu, Al, and the red light emitting phosphor is YVO.
₄ : It is preferably made of Eu.

Another EL-PL composite device according to the present invention comprises a substrate-side electrode formed on a substrate, a first insulating film formed on the substrate-side electrode, and a first insulating film formed on the first insulating film. A light-emitting body layer, a second insulating film formed on the light-emitting body layer, a transparent electrode disposed on the second insulating film, a phosphor layer formed on the transparent electrode, An ultraviolet reflective film formed on the phosphor layer, and by applying a voltage between the transparent electrode and the substrate-side electrode, ultraviolet light is emitted from the light emitting layer, and the ultraviolet light causes the fluorescent layer to emit fluorescent light. Is to emit light. Also in this case, the luminous body layer
It is preferable that nF ₂ : Gd is used because strong ultraviolet light emission can be obtained. The ultraviolet reflection film improves the brightness and eliminates the influence of ultraviolet rays on the human body.

The present invention also relates to any one of the above EL-P
It is an EL-PL display having an L composite element.
The display can be produced by using a EL-PL composite device by a method well known to those skilled in the art.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. [Embodiment 1] FIG. 2 is a plan view schematically showing an example of an EL-PL composite device according to the present invention, and FIG.
FIG. 3 is a partial cross-sectional view along the line II-III. 2 and 3, an EL-PL composite device (1) is formed on a plurality of strip-shaped substrate-side electrodes (3) arranged in parallel on a substrate (2) and formed on these substrate-side electrodes (3). A first insulating film (4), a light emitting layer (5) formed on the first insulating film (4), and the light emitting layer
(5) The second insulating film (6) formed thereon and the second insulating film
(6) On the top, a plurality of strip-shaped transparent electrodes (7) arranged in parallel so as to be orthogonal to the strip-shaped substrate side electrode (3) when viewed on a plane, and respectively arranged on each of these transparent electrodes (7). And a plurality of band-shaped phosphors (8). Then, a voltage can be applied between the transparent electrode (7) and the substrate-side electrode (3).

More specifically, in the EL-PL composite device (1), a plurality of belt-like electrodes having a width of, for example, about 0.18 mm and arranged in parallel on a glass substrate (2) as substrate-side electrodes (3). Metal electrodes are formed. As a metal electrode,
For example, Al electrode, Au electrode, Ag electrode, Cu electrode, Ni
An electrode or the like can be used. Preferably, it is an Al electrode. These metal electrodes can be formed by, for example, a vacuum evaporation method, a sputtering method, or the like. When precision is not required, a conductive paste can be applied and formed.

On the Al electrode (3), a first insulating film (4) and a second
A luminous body layer (5) sandwiched between the insulating film (6) and the insulating film (6) is provided. The material of the light-emitting layer (5) is not particularly limited, and examples thereof include ZnF ₂ : Gd and ZnF ₂ : Nd. Among them, ZnF ₂ : Gd is preferable because strong ultraviolet light emission can be obtained.

The ZnF ₂ : Gd will be described in more detail. ZnF ₂ and a Gd compound (eg, GdF ₃ , Gd
A raw material pellet for electron beam evaporation composed of ₂ O ₃ , GdCl ₃ , Gd ₂ S _{3 and the} like can be obtained by sintering, for example, at about 600 ° C. for about 2 hours in an argon atmosphere. The concentration of the Gd compound in ZnF ₂ is, for example, 1.
About 0 to 4.0 mol%, preferably 2.5 mol%
It is about. The ZnF ₂ : Gd active layer can be obtained, for example, by keeping at 150 ° C. in a vacuum chamber and then quenching at 300 ° C. for about 1 hour. Thus, Zn
Zn in which Gd ³⁺ is incorporated as an emission center in the F ₂ lattice
F ₂ : Gd is obtained.

As described above, examples of the Gd compound include GdF ₃ , Gd ₂ O ₃ , GdCl ₃ , Gd ₂ S _{3 and the} like. Among them, when GdCl ₃ is used, the strongest ultraviolet light emission is obtained. Is obtained.

The thickness of the luminous layer (5) is not particularly limited, but is usually about 300 to 900 nm, for example, 600
nm.

The material of the first insulating film (4) and the second insulating film (6) is not particularly limited. For example, a-SiN
x, Y ₂ O ₃ , Al ₂ O ₃ , Ta ₂ O ₅ , SiO ₂ , B
aTiO ₃ , PbTiO ₃ , PbZrO ₃ , TiO ₂ ,
SrTiO _{3 and the} like can be mentioned. Of these, a-Si
In general, Nx, Y ₂ O ₃ , Al ₂ O ₃ , Ta ₂ O ₅ , and SiO ₂ have a high withstand voltage but a low dielectric constant (10 to 20).
aTiO ₃ , PbTiO ₃ , PbZrO ₃ , TiO ₂ ,
SrTiO ₃ generally has a high dielectric constant (〜100) but a low withstand voltage. Further, a composite film of Ta ₂ O ₅ and SiO _{2 or} the like can be used. Of these, a-SiNx is preferred.

The first insulating film (4) and the second insulating film (6) can be formed by a plasma CVD method, a sputtering method, a sol-gel or the like. In the case of plasma CVD, N
Using H ₃ , H ₂ and SiH ₄ as gas sources, for example, 150
It can be deposited at ° C. The first insulating film (4) and the second
The thickness of the insulating film (6) is not particularly limited, but is usually 200
６００600 nm, for example, 400 nm.

A plurality of transparent electrodes (7) are arranged on the second insulating film (6). As the transparent electrode (7), for example, indium tin oxide (ITO), SnO ₂ , ZnO, IT
A composite of O and ZnO can be used. ITO is preferred. The transparent electrode (7) is, for example, a strip having a width of about 0.18 mm, and is arranged in parallel with the above-mentioned substrate-side electrode (3) at an interval. Transparent electrode (7)
Can be formed by a sputtering method, sol-gel, or the like.

A strip-shaped phosphor is provided on each transparent electrode (7).
(8) is arranged. Phosphor (8) is a blue-emitting phosphor
(8B), a green light-emitting phosphor (8G) and a red light-emitting phosphor (8R) are arranged in a plane.

The material of the phosphor (8) is not particularly limited. Examples of the blue light-emitting phosphor (8B) include BaMgA.
l ₁₄ O ₂₃ : Eu, Sr ₁₀ (PO ₄ ) ₆ Cl ₂ : Eu,
(Ca, Sr, Ba) ₁₀ (PO ₄ ) ₆ Cl ₂ : Eu,
(Sr, Mg) ₂ P ₂ O ₇ : Eu, Y ₂ SiO ₅ :
Ce, ZnS: Ag, Cl and the like. Of these, BaMgAl ₁₄ O ₂₃ : Eu is preferable because of its high conversion efficiency with respect to 311.5 nm ultraviolet light emitted from ZnF ₂ : Gd.

The green light emitting phosphor (8G) includes, for example, ZnS: Cu, Al, Zn ₂ SiO ₄ : Mn,
MnAl ₁₁ O ₁₉ : Ce, Tb, Y ₂ SiO ₅ : Ce,
Tb, LaPO ₄ : Ce, Tb, Y ₂ O ₂ S: T
_{b, BaO · 6Al 2 O 3} : Mn , and the like. Of these, ZnS: Cu, Al is preferable because of its high conversion efficiency with respect to 311.5 nm ultraviolet light emitted from ZnF ₂ : Gd.

As the red light emitting phosphor (8R), for example, YVO ₄ : Eu, Y ₂ O ₃ : Eu, Y ₂ O
₂ S: Eu, (Y, Gd) BO ₃ : Eu and the like. Of these, YVO ₄ : Eu is ZnF ₂ : Gd
It is preferable because it has a high conversion efficiency with respect to 311.5 nm ultraviolet light emitted more.

The formation of each of these phosphors is performed, for example, in the case where the particle size is 1
It can be performed by a flow coating method or a sedimentation method using a powder suspension of 10 to 10 μm, a screen printing method using a paste, or the like. Each of these phosphors (8B), (8G)
And the thickness of (8R) is not particularly limited, but is usually 3 to 20.
It is about μm, for example, 6 μm.

In the EL-PL composite device having such a configuration, when a voltage is applied between the transparent electrode (7) and the substrate-side electrode (3), ultraviolet light is emitted from the luminous body (5), and this ultraviolet light is emitted. Fluorescence is emitted from the phosphor (8) as an excitation light source. Blue phosphor (8B), green phosphor
Since (8G) and the red light emitting phosphor (8R) are arranged in a plane, full-color light emission can be obtained.

In the first embodiment, the glass substrate (2)
Is 17 mm long and 23 mm wide, the width of the Al electrode (3) is 0.18 m, and the width of the ITO transparent electrode (7) is 0.18 m
And the light-emitting layer (5) is ZnF ₂ : G having a thickness of 600 nm.
dCl ₃ , the first insulating film (4) and the second insulating film (6) have a thickness of 4
00 nm a-SiNx, blue light emitting phosphor (8B) is BaM
gAl ₁₄ O ₂₃ : Eu, green light emitting phosphor (8G) is ZnS: C
An EL-PL composite element (1) having a thickness of 6 μm and comprising u, Al and a red light-emitting phosphor (8R) of YVO ₄ : Eu, respectively.
When a voltage of 260 V is applied between the ITO transparent electrode (7) and the Al electrode (3), the maximum light emission is 10 cd / m ^{2 for} blue, 30 cd / m ² for green, and 50 cd / m ² for red. ² obtained.

[Second Embodiment] FIG. 4 is a partial cross-sectional view of an improved example of the EL-PL composite device shown in FIGS. 2 and 3. The difference from the elements of FIGS. 2 and 3 is that ribs (9B) are provided between adjacent phosphors ((8B) and (8G), (8G) and (8R), and (8R) and (8B)). ) Is formed in contact with the side surface of the phosphor. Also, the phosphor located at the left end in FIG.
A rib (9) is also formed on the left side surface of (8R), and a rib (9) is similarly formed on the right side surface of the phosphor located at the right end (not shown). The ITO transparent electrode (7) and the rib
Each phosphor ((8B), (8G), (8
The width of the ITO transparent electrode (7) is smaller than the width of R)). The ribs (9) prevent reflection of external light and improve contrast.

The material for the rib (9) is not particularly limited, but for preventing reflection of external light (absorbing external light), for example, graphite, black inorganic pigment, etc. may be used. In order to reflect the light emitted from the phosphor, titanium oxide,
Calcium phosphate and the like.

From such a viewpoint, as shown in FIG.
The rib (9) has a surface layer (9A) for preventing reflection of external light,
It is preferable to have a two-layer structure with the lower layer (9B) for reflecting the light emitted from the phosphor. The surface layer (9A) is preferably formed of graphite, a black inorganic pigment, or the like, and the lower layer (9B) is preferably formed of titanium oxide, calcium phosphate, or the like.

The rib 9 can be formed by, for example, a lift-off method or a screen printing method. In the case of the lift-off method, a negative photoresist or a dry film is exposed and developed, a rib material (paste) is buried in a space portion, and then the resist is removed. 2
By sequentially embedding the seed pastes, the two-layer structure is obtained.

[Embodiment 3] FIG. 6 is a partial sectional view of an improved example of the EL-PL composite device shown in FIGS. 2 and 3. The difference from the devices of FIGS. 2 and 3 is that each phosphor ((8
B), (8G), and (8R)) having an ultraviolet reflecting film (10) on the upper surface.

As the ultraviolet reflection film (10), a known film can be used without any particular limitation. For example,
A film (10) or the like in which a high-refractive-index dielectric film such as TiO ₂ or Ta ₂ O ₅ and a low-refractive-index dielectric film such as SiO ₂ are alternately coated on a glass plate (11). is there.

By providing an ultraviolet reflecting film (10) on the upper surface of the phosphor (8), the luminous body (5) once passing through the phosphor (8)
UV light from the reflector (10) is reflected on the surface of the phosphor (8)
When it enters, it excites the phosphor (8), so that the brightness is improved.
By the arrangement of the ultraviolet reflecting film (10), for example, an improvement in luminance of about 20% can be obtained. Further, since ultraviolet rays do not exit from the upper surface of the element, there is no influence of the ultraviolet rays on the human body.

[Embodiment 4] FIG. 7 is a partial cross-sectional view of an improved example of the EL-PL composite device shown in FIGS. 2 and 3, showing the improved elements of the device of FIG. 4 and the device of FIG. Both are provided. FIG. 8 is an enlarged sectional view showing a main part of an improvement of the EL-PL composite device of FIG.

7 and 8, the phosphors (8B) and (8G), (8G) and (8R),
(8R) and (8B)), a rib (9) is formed in contact with the side surface of the phosphor, and the rib (9R) is also formed on the left side surface of the phosphor (8R) located at the left end in FIG. ), And a rib (9) is similarly formed on the right side surface of the phosphor located at the right end (not shown). The width of the ITO transparent electrode (7) is smaller than the width of each phosphor ((8B), (8G), (8R)) so that the ITO transparent electrode (7) and the rib (9) are insulated. , ITO
There is a gap (a) between the transparent electrode (7) and the rib (9). Further, similarly to the device of FIG. 6, each of the phosphors ((8B), (8G), (8
R)) has an ultraviolet reflecting film (10) on the upper surface, and this reflecting film (10) is provided in contact with the upper end surface of the rib (9).

In such a configuration, the ultraviolet reflecting film (1)
(0), the ultraviolet light from the luminous body (5) once passing through the phosphor (8) is reflected and reenters the phosphor (8),
Exciting (8) improves brightness. Further, since the reflected ultraviolet light does not enter other phosphors due to the presence of the ribs (9), color mixing does not occur. In addition, ribs (9)
Thereby, reflection of external light can be prevented, and contrast is improved. There is no effect of ultraviolet rays on the human body.

[Fifth Embodiment] FIG. 9 is an enlarged sectional view of a main part of a modification of the EL-PL composite device shown in FIGS. 7 and 8. In this example, ITO transparent electrode (7) and rib
The phosphor (8) is formed in a substantially H-shaped cross-section so as to cover the ITO transparent electrode (7) so that the phosphor is insulated from the phosphor (9). The void (b) formed between the phosphor (8) and the ultraviolet reflecting film (10) may be occupied by the phosphor (8).

[Embodiment 6] FIG. 10 is a partial sectional view of an example of another EL-PL composite device according to the present invention.
In FIG. 10, the EL-PL composite device includes a substrate-side Al electrode (3) formed on a substrate (2) and the substrate-side electrode (3).
A first insulating film formed on the first insulating film;
A light-emitting layer (5) formed thereon, a second insulating film (6) formed on the light-emitting layer (5), and a plurality of light emitting layers arranged in parallel on the second insulating film (6). It has a strip-shaped transparent electrode (7), a phosphor layer (8) formed on the transparent electrode (7), and an ultraviolet reflective film (10) formed on the phosphor layer (8). By applying a voltage between the transparent electrode (7) and the substrate-side electrode (3), ultraviolet light is emitted from the light emitting layer, and the fluorescent light is emitted from the phosphor layer by the ultraviolet light. Brightness is improved (about 20%) by the action of UV reflective film (10)
Also, the effect of ultraviolet rays on the human body is eliminated.

[0048]

According to the present invention, a high-luminance, high-contrast full-color EL-PL composite device can be obtained as described above. In particular, those in which ribs are formed between phosphors adjacent to each other and those having an ultraviolet reflective film on the phosphor are excellent in terms of high luminance and high contrast. The EL-PL composite device of the present invention is useful for EL-PL display applications.

[Brief description of the drawings]

FIGS. 1A and 1B are perspective views showing a basic configuration of an EL-PL composite device.

FIG. 2 is a plan view schematically showing an example of an EL-PL composite device of the present invention.

FIG. 3 is a partial sectional view taken along line III-III in FIG. 2;

FIG. 4 is a partial cross-sectional view of an improved example of the EL-PL composite device of the present invention.

FIG. 5 is an enlarged sectional view of a main part showing a preferred example of a rib in the EL-PL composite device of the present invention.

FIG. 6 is a partial sectional view of an improved example of the EL-PL composite device of the present invention.

FIG. 7 is a partial sectional view of an improved example of the EL-PL composite device of the present invention.

FIG. 8 is an enlarged sectional view showing a main part of an improvement of the EL-PL composite device of FIG.

FIG. 9 is an enlarged sectional view of a main part of a modification of the EL-PL composite device of the present invention.

FIG. 10 is a partial sectional view of an example of the EL-PL composite device of the present invention.

[Explanation of symbols]

 (1): EL-PL composite element (2): Substrate (3): Substrate side electrode (4): First insulating film (5): Light emitting layer (6): Second insulating film (7): Transparent electrode (8): Phosphor (8B): Blue light-emitting phosphor (8G): Green light-emitting phosphor (8R): Red light-emitting phosphor (9): Rib (10): UV reflective film (11): Glass plate

Claims (10)

[Claims] 1. A plurality of strip-shaped substrate-side electrodes arranged in parallel on a substrate, a first insulating film formed on these substrate-side electrodes, and a light-emitting layer formed on the first insulating film. A second insulating film formed on the light-emitting layer, and a plurality of strip-shaped transparent electrodes arranged in parallel on the second insulating film so as to intersect with the strip-shaped substrate-side electrode when viewed in plan. A plurality of phosphors disposed on these transparent electrodes, and by applying a voltage between the transparent electrodes and the substrate-side electrodes, the luminous bodies emit ultraviolet rays, and the ultraviolet rays cause the phosphors to fluoresce. An EL-PL composite device that emits light. 2. The EL-PL composite device according to claim 1, wherein each of the phosphors has a band shape, and is disposed on each of the band-shaped transparent electrodes. 3. Each phosphor has a substantially square shape,
The EL-PL composite device according to claim 1, wherein the EL-PL composite device is arranged on intersections between the strip-shaped substrate-side electrode and the strip-shaped transparent electrode. 4. The EL-PL according to claim 2, wherein a rib is formed between phosphors adjacent to each other.
Composite element. 5. The EL according to claim 2, further comprising an ultraviolet reflecting film on the phosphor.
-PL composite element. 6. The EL-PL according to claim 2, wherein a blue light-emitting phosphor, a green light-emitting phosphor, and a red light-emitting phosphor are arranged in a plane as the phosphor.
Composite element. 7. A substrate-side electrode formed on a substrate, a first insulating film formed on the substrate-side electrode, a light emitting layer formed on the first insulating film, and the light emitting layer A second insulating film formed thereon, a transparent electrode disposed on the second insulating film, a phosphor layer formed on the transparent electrode, and an ultraviolet reflecting film formed on the phosphor layer An EL-PL composite device, comprising: applying a voltage between the transparent electrode and the substrate-side electrode to cause the light emitting layer to emit ultraviolet light, and the ultraviolet light to emit fluorescent light from the phosphor layer. 8. The EL-PL according to claim 1, wherein the luminous body layer is composed of ZnF ₂ : Gd.
Composite element. 9. The light-emitting layer is made of ZnF ₂ : Gd, the blue light-emitting phosphor is made of BaMgAl ₁₄ O ₂₃ : Eu, the green light-emitting phosphor is made of ZnS: Cu, Al, and the red light-emitting phosphor is YVO _4. : E according to claim 6, consisting of: Eu.
L-PL composite element. 10. An EL-PL display comprising the EL-PL composite device according to claim 1. Description: