Light-emitting device

Abstract

To provide a small light-emitting device. Also, to provide a light-emitting device that minimizes shadowing. [Solution] A switching circuit that supplies a pulsed constant current, and a generator that supplies a pulsed constant current. We came up with a configuration that includes an optical panel.

Description

[Technical Field]

[0001] This invention relates to a product, a method, or a method of manufacturing; or to a process, a machine , relating to manufacture or composition of matter. In particular The present invention relates to, for example, semiconductor devices, display devices, light-emitting devices, energy storage devices, and methods for driving them. Or, the present invention relates to a method for manufacturing them. In particular, the present invention relates to a light-emitting device. [Background technology]

[0002] Organic electroluminescence (EL) is used. Research and development of light-emitting elements (also written as organic EL elements) are actively underway. The basic structure involves sandwiching a layer containing a light-emitting organic compound (also referred to as the EL layer) between a pair of electrodes. That's how it works. By applying a voltage to this element, light is emitted from the luminescent organic compound. You can obtain this.

[0003] Because organic EL elements can be formed in a film-like structure, large-area elements can be easily formed. It can do this, and has high utility as a surface light source that can be applied to lighting and other applications.

[0004] For example, Patent Document 1 discloses a lighting fixture using an organic EL element. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2009-130132 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] The camera is equipped with a flash so that photos can be taken even in dark places.

[0007] Furthermore, there is a need to make cameras smaller and / or lighter so that they can be easily carried. It is being done.

[0008] However, when the flash is reduced in size, the light-emitting part becomes closer to a line or a point, resulting in the following problems. This becomes apparent.

[0009] Since light travels in a straight line from the light source, the shadow cast by an object becomes clearer the smaller the light source.

[0010] This means that, for example, when you photograph a person's face in a dark place using a flash, the shadow of the nose will appear on the cheek. It may sometimes be projected.

[0011] One aspect of the present invention was made under the aforementioned technical background. Therefore, small One of the objectives is to provide a light-emitting device of a certain type, or to provide a light-emitting device that does not cast shadows. One of the tasks is to do the following.

[0012] Furthermore, the description of these problems does not preclude the existence of other problems. The approach does not need to solve all of these problems. This will become clear from the description in the specification, drawings, claims, etc., and the specification, drawings It is possible to extract other issues from the descriptions in the surfaces, claims, etc. [Means for solving the problem]

[0013] The embodiments described below include a light source with a light-emitting section that spreads out in a planar manner, which emits light at high brightness in a short period of time. This includes one aspect of the present invention that was created with a focus on a configuration that can emit light.

[0014] A light-emitting device according to one aspect of the present invention includes a switching circuit that supplies a pulsed constant current, and a light-emitting panel to which the pulsed constant current is supplied.

[0015] One aspect of the present invention includes a switching circuit that can supply a constant current pulse when a constant current and a control pulse signal are supplied, a constant current source that can supply a constant current, a drive circuit that can supply a control pulse signal and includes a start switch, and a light-emitting panel to which the constant current pulse is supplied.

[0016] The drive circuit outputs a control pulse signal in accordance with the opening and closing operation of the start switch so that the switching circuit supplies a constant current having a half-value width of 1 millisecond or more and 1000 milliseconds or less.

[0017] In addition, one aspect of the present invention is such that the light-emitting panel has a support substrate and a light-emitting element that spreads planarly on the support substrate, and the light-emitting element includes a first electrode on the support substrate side with respect to a second electrode, a second electrode that overlaps the first electrode, and an EL layer between the first electrode and the second electrode.

[0018] In addition, one aspect of the present invention is such that the light-emitting panel has a curved surface, a flexible support substrate, and a light-emitting element that spreads planarly on the support substrate, and the light-emitting element includes a first electrode on the support substrate side, a second electrode that overlaps the first electrode, and an EL layer between the first electrode and the second electrode.

[0019] In addition, one aspect of the present invention is such that the constant current source includes an AC-DC converter that supplies a direct current, and a DC-DC converter that is supplied with the direct current and can supply a constant current. This is the light-emitting device described above. In this specification, a device that converts alternating current to direct current is referred to as an AC / DC converter. A converter is a device that converts the voltage of a direct current to a direct current of a different voltage. It is called a converter. Furthermore, a constant current power supply is constructed using a DC-DC converter together with a current sensor. It is possible.

[0020] Furthermore, in one aspect of the present invention, a battery that supplies a first voltage and a first voltage supplied to a first A first DC-DC converter that supplies a second voltage higher than the first voltage, and the second voltage supplied A capacitor, and a second that can supply a constant current, which is powered by the capacitor. The above-mentioned light-emitting device includes a DC-DC converter.

[0021] Furthermore, one aspect of the present invention is a camera or digital camera equipped with the light-emitting device described in any one of the above. It is a still camera. [Effects of the Invention]

[0022] According to one aspect of the present invention, a compact light-emitting device can be provided. Alternatively, a light-emitting device that does not cast shadows can be provided. We can provide a place for you. [Brief explanation of the drawing]

[0023] [Figure 1] A diagram illustrating the configuration of a light-emitting device according to an embodiment. [Figure 2] A diagram illustrating a light-emitting panel according to an embodiment. [Figure 3] A diagram illustrating a light-emitting panel according to an embodiment. [Figure 4] A diagram illustrating a light-emitting panel according to an embodiment. [Figure 5] A diagram illustrating a light-emitting element according to an embodiment. [Figure 6] A diagram illustrating an electronic device according to an embodiment. [Figure 7]A diagram showing the voltage-luminance characteristics of the light-emitting panel in the embodiment. [Figure 8] A figure showing the emission spectrum of the light-emitting panel in the embodiment. [Modes for carrying out the invention]

[0024] Embodiments will be described in detail with reference to the drawings. However, the present invention is not limited to the following description. Without departing from the spirit and scope of the present invention, its form and details may be modified in various ways. It will be easily understood by those skilled in the art to obtain this. Therefore, the present invention is as shown in the embodiments below. The description is not to be interpreted as being limited to the stated content. The same reference numeral is used in common across different drawings for parts that are identical or have similar functions. I will omit the explanation of that repetition.

[0025] (Embodiment 1) In this embodiment, the configuration of a light-emitting device according to one aspect of the present invention is shown in Figures 1(A-1) to 1 I will explain this while referring to (A-3).

[0026] Figure 1(A-1) is a block diagram illustrating the configuration of a light-emitting device according to one embodiment of the present invention.

[0027] The light-emitting device 100A described in this embodiment is supplied with a constant current and a control pulse signal. A switching circuit 110 that can supply a constant current pulse, and a circuit that can supply a constant current It is equipped with a constant current DC power supply of 140A and a start switch 132 to supply control pulse signals. It comprises a drive circuit 130 capable of doing so, and a light-emitting panel 120 to which a constant current pulse is supplied. The drive circuit 130 then switches a constant current with a half-width of 1 millisecond or more and 1000 milliseconds or less. Circuit 110 supplies control pulse signals in conjunction with the opening and closing operation of the start switch 132. Output.

[0028] The light-emitting device 100A described in the above embodiment includes a switching circuit 11 that supplies a pulsed constant current. It consists of 0 and a light-emitting panel 120 to which a pulsed constant current is supplied. This allows the light-emitting section, to which a pulsed constant current is supplied, to be spread out in a planar manner without increasing the thickness. Yes, it is possible. As a result, a small light-emitting device can be provided. Or, a light-emitting device that produces less shadow can be provided. It can be used.

[0029] The individual elements constituting the light-emitting device 100A according to one embodiment of the present invention will be described below.

[0030] 《Light-emitting panel》 The light-emitting panel 120 includes a support substrate 401 and a light-emitting element 40 that spreads out in a planar manner on the support substrate 401. It has 3 and . And the light-emitting element 403 has a first electrode 421 on the support substrate 401 side, The second electrode 425 overlaps with the first electrode 421, and the first electrode 421 and the second electrode 425 An EL layer 423 is included in between (see Figure 2).

[0031] The light-emitting panel 120 has a light-emitting area of ​​5 cm². 2 More than 200cm 2 Preferably 15 cm 2 More than 100cm 2 It spreads out in a planar manner below.

[0032] This makes the light-emitting panel 120 thinner and lighter compared to conventional xenon lamps and the like. This is possible. In addition, the heat generated by the light emission is distributed over a wide area of ​​the light-emitting panel 120. Heat is dissipated efficiently. As a result, heat accumulation in the light-emitting panel 120 is suppressed, and the light-emitting panel 1 The degradation of 20 is suppressed.

[0033] In this specification, the layer provided between the pair of electrodes of the light-emitting element 403 is referred to as the EL layer. Therefore, the light-emitting layer containing an organic compound, which is a light-emitting material sandwiched between electrodes, is one embodiment of the EL layer. be.

[0034] By selecting and using luminescent organic compounds, it is possible to produce white light. Panel 120 can be configured. For example, multiple luminescent elements emitting colors that are complementary to each other. Organic compounds can be used. Alternatively, luminescent organic compounds that exhibit red, green, and blue colors can be used. Compounds can be used. In addition, various emission spectra can be obtained from a variety of organic compounds. It can be selected and used. This allows for the creation of a light-emitting device 100A with excellent white balance. You can obtain this.

[0035] Using luminescent organic compounds results in a wider range of light emission compared to light-emitting diodes using inorganic materials. A spectrum can be obtained. Light with a broad emission spectrum is close to natural light and is suitable for photography. It is suitable for use in shaded areas. It also comprises a flexible support substrate and an organic EL element on the support substrate. A flexible light-emitting panel can be positioned along a curved housing. This allows the light-emitting device to be placed without compromising the design of the enclosure. The flash can be positioned along the curved surface of the camera's housing.

[0036] The configuration of the light-emitting panel 120 will be described in detail in Embodiment 2.

[0037] 《Constant current DC power supply》 The 140A constant current DC power supply consists of an AC / DC converter that supplies DC current, and a DC current supply It has a DC-DC converter.

[0038] An example of a constant current supplied by a DC-DC converter is shown in Figure 1(A-2).

[0039] 《Drive Circuit》 The drive circuit 130 supplies a control pulse signal of a predetermined width.

[0040] The predetermined width is 1 millisecond or more and 1000 milliseconds or less, preferably 10 milliseconds or more and 100 It is less than a millisecond.

[0041] For example, start switch 132, latch circuit and monostable multivibrator The drive circuit 130 can be configured using this.

[0042] Specifically, the start switch 132 is used to supply a high or low signal to the latch circuit. The latch circuit supplies the trigger signal, and the monostable multi The vibrator supplies a rectangular wave with a predetermined width as a control pulse signal.

[0043] Furthermore, the control pulse signal is supplied to the constant current DC power supply 140A, and the constant current DC power supply 140A is used. A configuration that uses a control pulse signal for control may also be used. Specifically, the DC-DC converter The timing of supplying a constant current may be controlled using a control pulse signal. This allows, The waveform of a constant current with a predetermined width, i.e., a constant current pulse, can be shaped.

[0044] Switching circuits The switching circuit 110 emits a constant current pulse while a constant current and control pulse signal are supplied. It supplies to Nel 120.

[0045] For example, the switching circuit 110 can be configured using a power transistor or power FET. This can be done. Specifically, a control pulse signal is supplied to the gate of the power transistor, and the first A constant current is supplied to the electrode, and the light-emitting panel 120 is electrically connected to the second electrode, forming a switchable circuit 1 It can form 10.

[0046] The following is an example of how the constant current pulse supplied by the 140A constant current DC power supply changes over time. This is shown in Figure 1(A-3). For example, a current of 2A is supplied to the light-emitting panel 120 for 50 milliseconds. It is possible.

[0047] <Variation> The light-emitting device illustrated in the modified example of this embodiment is shown in Figures 1(B-1) to 1(B-3). I will explain while referring to this.

[0048] Figure 1(B-1) is a block diagram illustrating the configuration of a light-emitting device according to one embodiment of the present invention.

[0049] The light-emitting device 100B, which will be explained with reference to Figure 1(B-1), will be explained with reference to Figure 1(A-1). The light-emitting device 100A consists of a constant current DC power supply 140B and a counter circuit. The configuration is different. Note that the other configurations are the same as those of the light-emitting device 100A, which will be explained with reference to Figure 1(A-1). Therefore, the above explanation should be taken into consideration.

[0050] Variations of constant current DC power supply The constant current DC power supply 140B described in a modified example of this embodiment is a battery that supplies the first voltage. Then, a first DC-DC converter is supplied with a first voltage and a second voltage higher than the first voltage. A voltage converter, a capacitor to which a second voltage is supplied, and a second power supply from the capacitor. It has a DC-DC converter and

[0051] The first DC-DC converter boosts the battery voltage to a second voltage and supplies it.

[0052] The capacitor is charged with the second voltage.

[0053] The second DC-DC converter is supplied with power stored in a capacitor and provides a constant current. ru.

[0054] In this configuration, while the capacitor supplies power to the second DC-DC converter The second DC-DC converter can supply a constant current. Furthermore, the capacitor stores... When the supplied power falls below a predetermined value, the second DC-DC converter becomes unable to supply a constant current. ru.

[0055] Figure 1(B-2) shows an example of how the current supplied by the constant-current DC power supply 140B changes over time. This will be shown.

[0056] The constant current DC power supply 140B controls the width of the control pulse signal supplied by the drive circuit 130 ( For example, it can supply a constant current for longer than 50 milliseconds. The current flows through the switching circuit 110. As current flows, the power stored in the capacitor is consumed, and eventually the constant current DC power supply 140B... It becomes impossible to supply a constant current. As a result, a current that is not a square wave is emitted from the light-emitting panel 120. As a result of the flow, the light-emitting panel 120 emits light at a brightness lower than a predetermined brightness, which is not useful. Power is consumed unnecessarily. The switching circuit 110 consumes power unnecessarily in this way. To prevent this from happening, the supply of current can be stopped after supplying it for a predetermined time. Figure 1(B-3) shows an example of the change in the current supplied by the switching circuit 110 over time. show.

[0057] Thus, the constant current DC power supply 140B can supply a constant current using a battery. This makes it possible to provide a portable light-emitting device 100B.

[0058] Counter circuit The counter circuit 150 accumulates the number of times the drive circuit 130 has supplied a control pulse signal. This allows us to determine the number of times the light-emitting panel 120 has been illuminated.

[0059] For example, the brightness of the light-emitting panel 120 decreases depending on the number of times the light-emitting panel 120 is illuminated. It may happen.

[0060] To compensate for the reduced brightness of the light-emitting panel 120, the data is accumulated in the counter circuit 150. The number of times this has happened may be fed back to the drive circuit 130 to lengthen the width of the control pulse signal.

[0061] Alternatively, to compensate for the reduced brightness of the light-emitting panel 120, the counter circuit 150 The accumulated number of cycles is fed back to the constant current DC power supply 140B, and the constant current DC power supply 140 The magnitude of the constant current supplied by B may be increased.

[0062] This embodiment can be appropriately combined with other embodiments shown herein. .

[0063] (Embodiment 2) In this embodiment, the configuration of the light-emitting panel that can be used in a light-emitting device according to one aspect of the present invention is as follows: This will be explained with reference to Figures 2 through 4.

[0064] 《Example of a light-emitting panel configuration 1》 Figure 2(A) is a plan view showing a light-emitting panel according to one embodiment of the present invention, and Figure 2(B) is a plan view showing Figure 2( This is a cross-sectional view obtained by cutting A) along the dashed line AB.

[0065] The light-emitting panel shown in Figures 2(A) and 2(B) consists of a support substrate 401, a sealing substrate 405, and a sealing material 40 A light-emitting element 403 is provided within the space 415 surrounded by 7. The light-emitting element 403 is a bottom emitter It is an organic EL element with a cushion structure, specifically a support substrate 401 that transmits visible light. It has a first electrode 421, and an EL layer 423 on the first electrode 421, and on the EL layer 423 It has a second electrode 425 that reflects visible light.

[0066] The light-emitting element applied to one aspect of the present invention is not limited to a bottom emission structure, for example, a top It may also be an emission structure. Regarding the configuration of a light-emitting element applicable to one aspect of the present invention This will be described in detail in Embodiment 3.

[0067] The first terminal 409a is electrically connected to the auxiliary wiring 417 and the first electrode 421. An insulating layer 419 is provided on the electrode 421 in the region that overlaps with the auxiliary wiring 417. The first terminal 409a and the second electrode 425 are electrically insulated by the insulating layer 419. The second terminal 409b is electrically connected to the second electrode 425. Next, we will show a configuration in which the first electrode 421 is formed on the auxiliary wiring 417, but the first electrode An auxiliary wiring 417 may be formed on 421.

[0068] It is preferable to have a light extraction structure 411a at the interface between the support substrate 401 and the atmosphere. By providing a light extraction structure 411a at the interface between the support substrate 401 and the atmosphere, the effect of total internal reflection is reduced. This reduces the amount of light that cannot be extracted, thereby improving the light extraction efficiency of the light-emitting panel.

[0069] Furthermore, the light-emitting element 403 and the support substrate 401 have a light extraction structure 411b. Preferred. If the light extraction structure 411b has irregularities, the light extraction structure 411b and the first It is preferable to provide a planarization layer 413 between the electrodes 421. This allows the first electrode The electrode 421 can be made into a flat film, and the unevenness of the first electrode 421 in the EL layer 423 The generation of leakage current caused by this can be suppressed. Also, the planarization layer 413 and the support substrate 4 Because it has a light extraction structure 411b at the interface with 01, it can be extracted into the atmosphere due to the effect of total internal reflection. This can reduce unwanted light and improve the light extraction efficiency of the light-emitting panel.

[0070] For example, resin can be used as the material for the light extraction structure 411a and the light extraction structure 411b. It is possible to do so. Also, as light extraction structure 411a and light extraction structure 411b, Hemispherical lenses, microlens arrays, films with uneven surfaces, light-diffusing films, etc. It is also possible to use the above lens and film on the support substrate 401. 401 or an adhesive having a refractive index similar to that of the lens or film is used for bonding. By doing so, light extraction structures 411a and 411b can be formed. .

[0071] The planarization layer 413 has a surface that contacts the first electrode 421 rather than the surface that contacts the light extraction structure 411b. The side that is flatter is the flatter side. The material for the planarization layer 413 is transparent and has a high refractive index. Materials such as refractive agents (liquid substances, glass, resin, etc.) can be used.

[0072] Furthermore, one embodiment of the present invention may also be configured without a light extraction structure. In that case, a second electrode that reflects visible light can be used as a mirror, which is preferable.

[0073] 《Example of a light-emitting panel configuration 2》 Figure 3 is a plan view showing a light-emitting panel according to one embodiment of the present invention, and Figures 4(A) and 4(B) are respectively This is a cross-sectional view of Figure 3, cut along the dashed line XY.

[0074] In the light-emitting panel shown in Figure 4(A), the light-emitting element is placed on the support substrate 1220 via an insulating film 1224. Child 1250 is provided. Auxiliary wiring 1206 is provided on insulating film 1224. , electrically connected to the first electrode 1201. The end of the first electrode 1201 and terminal 1210 The end is covered by a partition wall 1205. Also, auxiliary wiring 12 is connected via the first electrode 1201. A partition wall 1205 is provided to cover 06. The light-emitting element 1250 is supported by a support substrate 1220, sealing It is sealed by the stopper substrate 1228 and the sealing material 1227. The light extraction structure 1209 is bonded to the support substrate 1220 and the sealing substrate 122. By using a flexible substrate in step 8, a flexible light-emitting panel can be realized.

[0075] The light-emitting element 1250 is an organic EL element with a bottom emission structure, and specifically, the support base The plate 1220 has a first electrode 1201 that transmits visible light, and E is placed on the first electrode 1201. It has an L layer 1202 and a second electrode 1203 on the EL layer 1202 that reflects visible light. .

[0076] In the light-emitting panel shown in Figure 4(B), the support substrate 122 of the light-emitting panel shown in Figure 4(A) Instead of 0 and the light extraction structure 1209, a support substrate 1229 having a light extraction structure is It is provided. The support substrate 1229 functions as a support and for extracting light from the light-emitting panel. It possesses both functions that improve efficiency and those that do not.

[0077] Here, when fabricating a flexible light-emitting panel, light-emitting elements are formed on a flexible substrate. One method for achieving this is to directly form a light-emitting element on a flexible substrate. The method involves placing a highly heat-resistant substrate (hereinafter referred to as the fabricated substrate) on a substrate different from a flexible substrate. After forming the light-emitting element, the fabricated substrate and the light-emitting element are separated, and the light-emitting element is placed on a flexible substrate. There is a second method of transposing the child, and

[0078] For example, a glass substrate that is thin enough to be flexible, in the manufacturing process of a light-emitting element When using a substrate that has heat resistance to the temperature, the first method allows the process to be It is preferable because it simplifies things.

[0079] Furthermore, by applying the second method, the low water permeability insulating film formed on the fabricated substrate can be made to It can be transferred onto a flexible substrate. Therefore, it has high water permeability and low heat resistance. Even when using resins or the like as materials for flexible substrates, the resulting product will be flexible and highly reliable. It is possible to manufacture optical panels.

[0080] Materials for the light-emitting panel An example of a material that can be used in a light-emitting panel according to one aspect of the present invention is described below.

[0081] [substrate] A material that transmits light is used for the substrate that extracts light from the light-emitting element. For example, glass. Materials such as quartz, ceramics, sapphire, and organic resins can be used.

[0082] By using a substrate with a thin film thickness, it is possible to make the light-emitting panel lighter and thinner. By using a substrate with a thickness sufficient to be flexible, a flexible light-emitting panel can be realized. Yes, it is possible. Also, the flexible light-emitting panel can be folded and stored when not in use. It can also be used as a reflector in a photo studio. It can be used as a lighting device that flashes light over a wide area. Alternatively, it can be folded. We can provide a lighting device that can be folded.

[0083] Examples of glass include alkali-free glass, barium borosilicate glass, and aluminobole. Silicate glass or the like can be used.

[0084] Materials that are flexible and transparent to visible light include, for example, materials that are flexible to a certain extent. Thick glass, polyethylene terephthalate (PET), polyethylene naphthalate ( Polyester resins such as PEN, polyacrylonitrile resin, polyimide resin, and polymethyl methyl nitrile resin. Polymethacrylate resin, polycarbonate (PC) resin, polyethersulfone (PES) ) Resins, polyamide resins, cycloolefin resins, polystyrene resins, polyamide imide Examples include resins and polyvinyl chloride resins. In particular, using materials with a low coefficient of thermal expansion is important. Preferably, for example, polyamide-imide resin, polyimide resin, PET, etc. are used. This can be done. In addition, substrates made by impregnating glass fibers with organic resin, or by impregnating inorganic fillers with organic resin. It is also possible to use substrates that have been mixed to lower the coefficient of thermal expansion. Substrates using such materials are Because it is lightweight, the light-emitting panel using this substrate can also be made lightweight.

[0085] Furthermore, the substrate on the side from which light is not extracted does not need to be translucent, as mentioned above. In addition to the substrate, metal substrates made of metal materials or alloy materials can also be used. Because alloy materials have high thermal conductivity, they can easily conduct heat throughout the entire encapsulating substrate, thus the light-emitting panel It is preferable as it can suppress localized temperature rises. To obtain flexibility and bendability, gold The thickness of the substrate is preferably 10 μm to 200 μm, and 20 μm to 50 μm. It is preferable to have a certain state.

[0086] There are no particular limitations on the materials that make up the metal substrate, but for example, aluminum, copper, nickel Preferably using kel, or an alloy of metal such as aluminum alloy or stainless steel. It is possible.

[0087] Furthermore, insulating treatment can be performed by oxidizing the surface of a conductive substrate or by forming an insulating film on the surface. A substrate with a treated surface may be used. For example, coating methods such as spin coating or dip coating, An insulating film may be formed using methods such as electrodeposition, vapor deposition, or sputtering, or in an oxygen atmosphere In addition to leaving it in an open atmosphere or heating it, an oxide film is formed on the surface of the substrate by methods such as anodizing. You may do so.

[0088] As a flexible substrate, a layer made of the above material protects the surface of the light-emitting panel from scratches and other damage. A hard coat layer (e.g., a silicon nitride layer) or a layer of material that can distribute pressure (e.g., It may also be constructed by laminating with an aramid resin layer, etc. To suppress the reduction in the lifespan of the element, a silicon nitride film, silicon oxide nitride film, etc., and Films containing silicon, or films containing nitrogen and aluminum such as aluminum nitride films, have low water permeability. It may have an insulating film.

[0089] The substrate can also be used by stacking multiple layers. In particular, if the configuration includes a glass layer... This improves barrier properties against water and oxygen, resulting in a highly reliable light-emitting panel.

[0090] For example, a substrate can be used in which a glass layer, an adhesive layer, and an organic resin layer are laminated from the side closest to the light-emitting element. This is possible. The thickness of the glass layer is preferably 20 μm or more and 200 μm or less. The thickness should be between 25 μm and 100 μm. Glass layers of this thickness have high resistance to water and oxygen. It can achieve both barrier properties and flexibility simultaneously. Furthermore, the thickness of the organic resin layer can be 10 μm or less. The thickness of the organic resin layer shall be 200 μm or less, preferably 20 μm to 50 μm. By placing it outside the glass layer, cracks and fractures in the glass layer are suppressed, and mechanical Strength can be improved. Such a composite material of glass material and organic resin can be used as a substrate. By using this technology, it is possible to create a highly reliable and flexible light-emitting panel.

[0091] [Insulated film] An insulating film may be formed between the support substrate and the light-emitting element. The insulating film may be a silicon oxide film, nitrogen By using an inorganic insulating film such as silicon oxide film, silicon oxide-nitride film, or silicon nitride-oxide film. This is possible. In particular, to suppress the intrusion of moisture and other substances into the light-emitting element, a silicon oxide film, silicon nitride film It is preferable to use an insulating film with low water permeability, such as a concrete film or an aluminum oxide film. An insulating film may be provided to cover the light-emitting element using a target or material.

[0092] [Bulkhead] For the partition wall, an organic resin or an inorganic insulating material can be used. Examples of organic resins include Polyimide resin, polyamide resin, acrylic resin, siloxane resin, epoxy resin, and Phenolic resins and the like can be used as inorganic insulating materials. Silicon nitride and the like can be used. Particularly photosensitive resins can be used because they facilitate the fabrication of partitions. It is preferable to use [this].

[0093] The method for forming the partition wall is not particularly limited and includes, for example, photolithography, sputtering, and vapor deposition. Methods include droplet ejection (inkjet, etc.) and printing methods (screen printing, offset printing, etc.). You can use the following:

[0094] [Auxiliary wiring] Auxiliary wiring is not always necessary, but it can suppress voltage drops caused by electrode resistance. Therefore, it is preferable to provide it.

[0095] The materials used for auxiliary wiring are copper (Cu), titanium (Ti), tantalum (Ta), and tungsten (W). ), molybdenum (Mo), chromium (Cr), neodymium (Nd), scandium (Sc), Using materials selected from nickel (Ni) or alloy materials mainly composed of these, a single layer It is formed by or by lamination. Aluminum can also be used as the material for auxiliary wiring. However, in that case, a laminated structure is used to prevent corrosion problems, and a layer that does not come into contact with ITO, etc. Aluminum should be used. The thickness of the auxiliary wiring should be between 0.1 μm and 3 μm. This is possible, and preferably the particle size is 0.1 μm or more and 0.5 μm or less.

[0096] When a paste (such as silver paste) is used as the material for auxiliary wiring, the metal that makes up the auxiliary wiring becomes granular. It aggregates into a certain shape. As a result, the surface of the auxiliary wiring becomes rough and has many gaps, and the EL layer It is difficult to completely cover the auxiliary wiring, and it is difficult to make an electrical connection between the upper electrode and the auxiliary wiring. It becomes easier, which is preferable.

[0097] [Sealing material] The sealing method for the light-emitting panel is not limited; for example, it may be solid sealing or hollow sealing. For example, glass materials such as glass frit, and two-part resins that harden at room temperature. Resin materials such as photocurable resins, photocurable resins, and thermosetting resins can be used. The light panel may be filled with an inert gas such as nitrogen or argon, and PVC (poly Vinyl chloride resin, acrylic resin, polyimide resin, epoxy resin, silicone resin Fat, PVB (polyvinyl butyral) resin, EVA (ethylene vinyl acetate) resin, etc. It may be filled with resin. The resin may also contain a desiccant.

[0098] [Light extraction structure] The light extraction structure includes a hemispherical lens, a microlens array, and a filter with a convex-concave structure. Lenses, light-diffusing films, etc., can be used. For example, the above lenses and films can be placed on a substrate. The substrate, lens, or film is attached using an adhesive or the like having a refractive index similar to that of the substrate or lens. By attaching it, a light extraction structure can be formed.

[0099] This embodiment can be appropriately combined with other embodiments shown herein. .

[0100] (Embodiment 3) In this embodiment, a light-emitting element that can be used in a light-emitting device according to one aspect of the present invention is shown in Figure I will explain using number 5.

[0101] Examples of light-emitting element configurations The light-emitting element shown in Figure 5(A) has an EL layer 20 between the first electrode 201 and the second electrode 205. It has 3. In this embodiment, the first electrode 201 functions as the anode, and the second electrode 20 Port 5 functions as the cathode.

[0102] A voltage higher than the threshold voltage of the light-emitting element is applied between the first electrode 201 and the second electrode 205. Then, holes are injected into the EL layer 203 from the first electrode 201 side, and from the second electrode 205 side. Electrons are injected. The injected electrons and holes recombine in the EL layer 203, and in the EL layer 20 The light-emitting substance contained in 3 emits light.

[0103] The EL layer 203 has at least an emissive layer 303 containing an emissive material.

[0104] Furthermore, the EL layer 203, as a layer other than the light-emitting layer, is made of a material with high hole injection properties and high hole transport properties. Substances that are highly electron-transporting, substances with high electron-injection properties, or bipolar substances (electron The EL layer 203 may further contain a layer containing a substance with high transportability and hole transportability. Either low-molecular-weight compounds or high-molecular-weight compounds can be used, and they do not contain inorganic compounds. That's fine.

[0105] The light-emitting element shown in Figure 5(B) has an EL layer 20 between the first electrode 201 and the second electrode 205. The EL layer 203 has a hole injection layer 301, a hole transport layer 302, and a light-emitting layer 303. The electron transport layer 304 and the electron injection layer 305 are stacked in this order from the first electrode 201 side. It is.

[0106] As shown in Figure 5(C)(D), between the first electrode 201 and the second electrode 205 Multiple EL layers may be stacked on top of each other. In this case, an intermediate layer may be placed between the stacked EL layers. It is preferable to provide 207. The intermediate layer 207 has at least a charge generation region.

[0107] For example, the light-emitting element shown in Figure 5(C) has a first EL layer 203a and a second EL layer 203b An intermediate layer 207 is provided between them. Furthermore, the light-emitting element shown in Figure 5(D) has an EL layer made up of n layers (n (where is a natural number greater than or equal to 2), and between each EL layer, there is an intermediate layer 207.

[0108] Electrical in the intermediate layer 207 provided between EL layer 203(m) and EL layer 203(m+1) The behavior of electrons and holes will be explained. Between the first electrode 201 and the second electrode 205, an electron emitter When a voltage higher than the threshold voltage is applied, holes and electrons are generated in the intermediate layer 207, The pore moves to the EL layer 203(m+1) located on the second electrode 205 side, and the electron moves to the first electrode It moves to the EL layer 203(m) located on the pole 201 side. It is injected into the EL layer 203(m+1). The holes are recombined with electrons injected from the second electrode 205 side, and the EL layer 203 ( The light-emitting material contained in m+1) emits light. Also, electrons injected into the EL layer 203(m) , it recombines with the holes injected from the first electrode 201 side and is contained in the EL layer 203(m) The light-emitting material emits light. Therefore, the holes and electrons generated in the intermediate layer 207 are, Light emission occurs in different EL layers.

[0109] Furthermore, when EL layers are placed in contact with each other, the same configuration as the intermediate layer is formed between them. This can be achieved by placing EL layers in contact with each other without an intermediate layer. For example, one of the EL layers If a charge generation region is formed on a surface, an EL layer can be provided in contact with that surface.

[0110] Furthermore, by making the light-emitting color of each EL layer different, the entire light-emitting element can be desired Light emission of the color can be obtained. For example, in a light-emitting element having two EL layers, the first By making the emission color of the first EL layer and the emission color of the second EL layer complementary, the light-emitting element It is also possible to obtain a light-emitting element that emits white light as a whole. Furthermore, by using three or more EL layers The same applies to light-emitting elements.

[0111] Materials for light-emitting elements The following are examples of materials that can be used for each layer. Note that each layer is not limited to a single layer. It is not necessary to stack two or more layers.

[0112] <anode> The electrode that functions as the anode (first electrode 201) is made of a conductive metal, alloy, or conductive material. Compounds can be formed using one or more types of materials. In particular, a large work function (4.0 It is preferable to use a material with an eV of 1 or higher. For example, indium tin oxide (ITO:In Indium tin oxide, a silicon or silicon oxide-containing indium tin oxide Indium oxide containing indium zinc oxide, tungsten oxide, and zinc oxide, Graphene, gold, platinum, nickel, tungsten, chromium, molybdenum, iron, cobalt, Examples include copper, palladium, or nitrides of metallic materials (e.g., titanium nitride).

[0113] Furthermore, when the anode is in contact with the charge generation region, various conductive properties are considered without regard to the magnitude of the work function. Materials can be used, such as aluminum, silver, and aluminum-containing alloys. It is possible to be there.

[0114] <cathode> The electrode that functions as the cathode (second electrode 205) is made of a conductive metal, alloy, or conductive material. It can be formed using one or more types of composite materials. In particular, the work function is small (3. It is preferable to use materials with a voltage of 8 eV or less. For example, materials belonging to Group 1 or Group 2 of the periodic table. Elements that do this (for example, alkali metals such as lithium and cesium, calcium, strontium) Alkaline earth metals such as magnesium, etc., and alloys containing these elements (for example, Mg-Ag Rare earth metals such as Al-Li, europium, and ytterbium, and these rare earth metals Aluminum alloys, aluminum, silver, etc., can be used.

[0115] Furthermore, when the cathode is in contact with the charge generation region, various conductive properties are considered without regard to the magnitude of the work function. Materials containing silicon or silicon oxide can be used. For example, indium containing ITO, silicon or silicon oxide. Tin oxides and the like can also be used.

[0116] The electrodes can be formed using vacuum deposition or sputtering methods, respectively. When using paints such as paints, coating methods or inkjet methods can be used.

[0117] <Hole injection layer 301> The hole injection layer 301 is a layer containing a material with high hole injection properties.

[0118] Examples of materials with high hole injection potential include molybdenum oxide, vanadium oxide, and ruthenium oxide. Metal oxides such as um oxide, tungsten oxide, and manganese oxide, as well as phthalosyrastica. Phthalosyrastics such as nin (abbreviated as H2Pc) and copper(II) phthalocyanine (abbreviated as CuPc) Nin-based compounds can be used.

[0119] Also, poly(N-vinylcarbazole) (abbreviation: PVK), poly(4-vinyltriphenyl Polymer compounds such as poly(3,4-ethylenedioxide) (abbreviated as PVTPA), and poly(3,4-ethylenedioxide) Acids such as cythiophene / poly(styrene sulfonic acid) (PEDOT / PSS) are added. Polymer compounds can be used.

[0120] The hole injection layer 301 may also be used as a charge generation region. Hole injection layer 301 in contact with the anode If it is a charge generation region, various conductive materials can be used as the anode without considering the work function. This can be done. The materials that make up the charge generation region will be described later.

[0121] <Hole transport layer 302> The hole transport layer 302 is a layer containing a substance with high hole transport properties.

[0122] A material with high hole transport capabilities can be any material that has higher hole transport capabilities than electron transport capabilities, in particular , 10 -6 cm 2 It is preferable that the material has a hole mobility of / Vs or greater. For example, 4,4'-Bis[N-(1-naphthyl)-N-phenylamino]biphenyl (abbreviation: NP) B or α-NPD), 4-phenyl-4'-(9-phenylfluoren-9-yl)tri Aromatic amine compounds such as phenylamine (abbreviation: BPAFLP), 4,4'-di(N-ka Lubazolyl)biphenyl (abbreviation: CBP), 9-[4-(10-phenyl-9-antri 9-phenyl-3-[4-( 10-phenyl-9-antryl)phenyl]-9H-carbazole (abbreviation: PCzPA) Carbazole derivatives such as ) and 2-tert-butyl-9,10-di(2-naphthyl) Tracene (abbreviation: t-BuDNA), 9,10-di(2-naphthyl)anthracene (abbreviation Aromatic carbonization of :DNA), 9,10-diphenylanthracene (abbreviation: DPAnth), etc. Various compounds can be used, such as hydrogen compounds, polymer compounds like PVK and PVTPA. Cut.

[0123] <Luminous layer 303> The light-emitting layer 303 uses fluorescent compounds that emit fluorescence or phosphorescent compounds that emit phosphorescence. It is possible.

[0124] Examples of fluorescent compounds that can be used in the light-emitting layer 303 include N,N'-bis[4 -(9H-carbazole-9-yl)phenyl]-N,N'-diphenylstilbene-4 ,4'-diamine (abbreviation: YGA2S), N-(9,10-diphenyl-2-anthryl) )-N,9-diphenyl-9H-carbazole-3-amine (abbreviation: 2PCAPA), Examples include Bren.

[0125] Furthermore, examples of phosphorescent compounds that can be used in the light-emitting layer 303 include bis[2-( 4',6'-Difluorophenyl)pyridinate-N,C 2’ Iridium (III) pico Linert (abbreviation: Firpic), Tris(2-phenylpyridinato-N,C) 2’ ) Iri Dium(III) (abbreviation: Ir(ppy)3)(acetylacetonate)bis(3,5-di) Iridium(III)(Methyl-2-phenylpyradinate) (Abbreviation: Ir(mppr-Me Examples include organometallic complexes such as 2(acac).

[0126] Furthermore, the light-emitting layer 303 contains the above-mentioned light-emitting organic compound (light-emitting substance, guest material) and other materials. A configuration in which the host material is dispersed is also acceptable. Various materials can be used as the host material. It can be present, has a lower than the guest material's lowest orbital level (LUMO level), and is the highest occupied. It is preferable to use materials with low orbital levels (HOMO levels).

[0127] By dispersing the guest material in the host material, crystallization of the light-emitting layer 303 is suppressed. It can be controlled. Furthermore, it can suppress concentration quenching caused by high concentrations of guest materials. It is possible.

[0128] As host materials, the above-mentioned substances with high hole transport capabilities (for example, aromatic amine compounds and calcium carbonate) (Bazole derivatives) or substances with high electron transport capabilities described later (for example, quinoline skeleton or benzox) Metal complexes having a noline skeleton, or having oxazole ligands or thiazole ligands Metal complexes, etc., can be used. Specifically, tris(8-quinolinolato)aluminium. Um(III) (abbreviation: Alq), bis(2-methyl-8-quinolinolate)(4-pheni Metal complexes such as aluminium(III) (abbreviation: BAlq), 3-(4- Biphenylyl)-4-phenyl-5-(4-tert-butylphenyl)-1,2,4- Triazole (abbreviation: TAZ), vasophenanthroline (abbreviation: BPhen), vasocu Heterocyclic compounds such as profine (abbreviated as BCP), as well as CzPA, DNA, t-BuDNA, Condensed aromatic compounds such as DPAnth, aromatic amine compounds such as NPB, etc. can be used. can.

[0129] Furthermore, multiple types of host materials can be used. For example, rubre can be used to suppress crystallization. Further substances that suppress crystallization, such as ions, may be added. Also, the energy to the guest material To perform movement more efficiently, NPB, Alq, etc. may be further added.

[0130] Also, by providing a plurality of light-emitting layers and making the emission colors of each layer different, it is possible to obtain light emission of a desired color for the entire light-emitting device. For example, in a light-emitting device having two light-emitting layers, by making the emission color of the first light-emitting layer and the emission color of the second light-emitting layer be in a complementary color relationship, it is also possible to obtain a light-emitting device that emits white light as a whole. The same applies to a light-emitting device having three or more light-emitting layers.

[0131] 〈Electron transport layer 304〉 The electron transport layer 304 is a layer containing a substance with high electron transport properties.

[0132] As the substance with high electron transport properties, an organic compound with higher electron transport properties than holes may be used, and particularly, it is preferably a substance having an electron mobility of 10 -6 cm 2 / Vs or more.

[0133] Examples of the substance with high electron transport properties include metal complexes having a quinoline skeleton or a benzoquinoline skeleton, such as Alq and BAlq, and metal complexes having an oxazole-based or thiazole-based ligand, such as bis[2-(2-hydroxyphenyl)benzoxazolato]zinc (abbreviation: Zn(BOX)2) and bis[2-(2-hydroxyphenyl)benzothiazolato]zinc (abbreviation: Zn(BTZ)2). TAZ, BPhen, BCP, etc. can also be used.

[0134] 〈Electron injection layer 305〉 The electron injection layer 305 is a layer containing a substance with high electron injection properties.

[0135] Examples of materials with high electron injection potential include lithium, cesium, calcium, and lithium fluoride. Alkali metals such as um, cesium fluoride, calcium fluoride, and lithium oxide, Earth metals such as rutile or their compounds can be used. Also, erbium fluoride Such rare earth metal compounds can be used. Furthermore, the electron transport layer 304 described above is composed of It is also possible to use substances that do this.

[0136] <Charge generation region> The charge generation region is formed when an electron acceptor is added to an organic compound with high hole transport properties. Even with such a configuration, an electron donor is added to an organic compound with high electron transport properties. It may be constructed in this way. Furthermore, both of these configurations may be stacked.

[0137] Organic compounds with high hole transport properties can be used, for example, in the hole transport layer described above. Examples of materials include organic compounds with high electron transport properties, such as those used in the electron transport layer mentioned above. The materials that can be used are listed below.

[0138] Furthermore, as an electron acceptor, 7,7,8,8-tetracyano-2,3,5,6-tetraph Examples include ruoloquinodimethane (abbreviation: F4-TCNQ), chloranil, etc. Furthermore, transition metal oxides can be cited. Also, in groups 4 through 8 of the periodic table... We can list the oxides of the metals to which they belong. Specifically, vanadium oxide, niobium oxide, Tantalum oxide, chromium oxide, molybdenum oxide, tungsten oxide, manganese oxide, ray oxide Tium is preferred because of its high electron-accepting ability. In particular, molybdenum oxide is stable even in the atmosphere. Therefore, it is preferable because it has low hygroscopicity and is easy to handle.

[0139] Furthermore, the electron donors can be alkali metals, alkaline earth metals, rare earth metals, or elemental elements. Metals belonging to Group 13 of the timetable, as well as their oxides and carbonates, can be used. Specifically, lithium, cesium, magnesium, calcium, ytterbium, and indium. It is preferable to use lithium oxide, cesium carbonate, etc. Also, tetrathiana phthalate Organic compounds such as n may be used as electron donors.

[0140] The layers constituting the EL layer 203 and the intermediate layer 207 described above were each deposited using a vacuum deposition method. It can be formed by methods such as vapor deposition, transfer, printing, inkjet, and coating. can.

[0141] This embodiment can be appropriately combined with other embodiments shown herein. .

[0142] (Embodiment 4) In this embodiment, an electronic device using a light-emitting device according to one aspect of the present invention will be explained with reference to Figure 6. I will reveal it.

[0143] A light-emitting device according to one aspect of the present invention is used for the flash and shooting function of a camera such as a digital still camera. Cameras equipped in mobile phones (also called mobile phones or mobile phone devices) and personal digital information terminals. It can be used for flashing lights, etc. Also, for illumination in warning lights, lighthouses, decorative purposes, etc. It can be used for stimulants, etc.

[0144] Figure 6(A) shows an example of a digital still camera. Digital still camera 7300 It has a housing 7301, a lens 7304, a light-emitting device 7310, etc. This is where the light-emitting device according to one aspect of the present invention is applied. The light-emitting part 7303 of the light-emitting device 7310 is arranged so as to surround the lens 7304. The light-emitting device according to one aspect of the present invention has flexibility and thus can be bent. In the digital still camera 7300, since the non-light-emitting part 73 05 is bent along the shape of the housing 7301, the light-emitting part 7303 can be widely arranged around the lens 7 304. As a result, even when taking a picture of a person's face using a flash in a dark place, for example, it is possible to make it difficult for the shadow of the nose to be projected onto the cheek. In addition, the light-emitting element may be manufactured and provided in the non-light-emitting part 7305 in the same process and used as an indicator indicating the operating state. The light-emitting element may be manufactured and provided in the non-light-emitting part 7305 in the same process and used as an indicator indicating the operating state.

[0145] Figures 6(B) and (C) show an example of a mobile phone. One side (which can also be said to be the front surface) of the mobile phone 7350 is shown in Figure 6(B), and the back surface (which can also be said to be the back side) of the one side is shown in Figure 6(C). One side (which can also be said to be the front surface) of the mobile phone 7350 is shown in Figure 6(B), and the back surface (which can also be said to be the back side) of the one side is shown in Figure 6(C). The mobile phone 7350 includes a housing 7351, a display unit 7352, lenses 7354, 735 6, a light-emitting device 7360, etc. The light-emitting device 7360 applies the light-emitting device according to one aspect of the present invention. The light-emitting device 7360 has a light-emitting part 7353 and a non-light-emitting part 7355, and the light-emitting part 7353 is arranged so as to surround the lens 7354. The light-emitting part 7353 may be designed to be used as a mirror when not emitting light. The light-emitting part 7353 may be designed to be used as a mirror when not emitting light.

[0146] When the subject is on the display unit 7352 side, similar to the light-emitting part 7353, the entire surface or part of the display unit 7352 can also become a light-emitting part and an image can be taken using the lens 7356. In this case, the display unit 7352 can also be switched to the light-emitting part immediately before shooting. For example, ​​​​​​​is used as a display unit that displays the subject on the entire surface or a part of the display unit 7352, and the display unit may be switched to a light emitting unit immediately before shooting. Similarly, the entire surface or a part of the light emitting unit 7353 can also be used as a display unit.

[0147] Note that this embodiment can be appropriately combined with other embodiments described in this specification.

Example

[0148] In this example, a light emitting device according to one aspect of the present invention will be described.

[0149] A plan view of the light emitting panel manufactured in this example is shown in FIG. 3, and a cross-sectional view between the dashed-dotted lines X-Y in FIG. 3 is shown in FIG. 4(B). Note that in FIG. 3, a part of the configuration of the light emitting panel is shown in an omitted manner. As shown in FIG. 4(B), the light emitting panel of this example has a light extraction structure, and a light emitting element 1250 is provided on a support substrate 1229 via an insulating film 1224. An auxiliary wiring 1206 is provided on the insulating film 1224 and is electrically connected to a first electrode 1201. The end portions of the first electrode 1201 and the end portions of the terminals 1210 are covered with a partition wall 1205. Further, a partition wall 1205 that covers the auxiliary wiring 1206 via the first electrode 1201 is provided. The light emitting element 1250 is sealed by a support substrate 1229, a sealing substrate 1228, and a sealing material 1227.

[0150] In the light emitting panel of this example, a diffusion film of a polyester resin is used as the support substrate 1229, and a substrate having a thin glass layer and a polyethylene terephthalate (PET ) layer is used as the sealing substrate 1228. These substrates have flexibility, and the light emitting panel of this example is a flexible

[0151] sealed.

[0151] In the light emitting panel of this example, a diffusion film of a polyester resin is used as the support substrate 1229, and a substrate having a thin glass layer and a polyethylene terephthalate (PET ) layer is used as the sealing substrate 1228. These substrates have flexibility, and the light emitting panel of this example is a flexible ) layer is used as the sealing substrate 1228. These substrates have flexibility, and the light emitting panel of this example is a flexible ​​It is a flexible light-emitting panel. Furthermore, the area of ​​the light-emitting region in the light-emitting panel of this embodiment is It measures 56mm x 42mm.

[0152] The light-emitting element 1250 is an organic EL element with a bottom emission structure, and specifically, the support base The plate 1229 has a first electrode 1201 that transmits visible light, and E is placed on the first electrode 1201. It has an L layer 1202 and a second electrode 1203 on the EL layer 1202 that reflects visible light. .

[0153] The method for manufacturing the light-emitting panel in this embodiment will be described below.

[0154] First, on the glass substrate which is the fabrication substrate, a base film, a release layer (tungsten film), and a layer to be released are applied. They were formed in this order. In this embodiment, the peelable layer is insulating film 1224, auxiliary wiring 1206 It includes a first electrode 1201 and a partition wall 1205.

[0155] A total of seven auxiliary wirings 1206 were formed on the insulating film 1224. At this time, the pin of the auxiliary wiring 1206 The groove was made to be 5.3 mm and the width L2 to be 322 μm. First electrode For 1201, an indium tin oxide (ITSO) film containing silicon oxide was formed. Auxiliary A total of seven partition walls 1205 covering the wiring 1206 were formed, with a width L1 of 330 μm.

[0156] Next, the temporary support substrate and the first electrode 1201 are bonded together using a release adhesive, and the release layer is formed. The layer to be peeled was removed from the fabricated substrate using [a specific method]. As a result, the layer to be peeled was provided on the temporary support substrate side. It is possible.

[0157] Next, the peeled layer, which has been removed from the fabricated substrate and exposed insulating film 1224, is bonded using an ultraviolet light-curing adhesive. The support substrate 1229 was bonded using an agent. As the support substrate 1229, as described above, a diffusion film of a polyester resin was used. Thereafter, the temporary support substrate was peeled off, and the first electrode 1 229 was exposed on 229.

[0158] Next, an EL layer 1202 and a second electrode 1203 were formed on the first electrode 1201. The EL layer 1202 includes, from the side of the first electrode 1201, a first EL layer having a light-emitting layer containing a fluorescent compound exhibiting blue light emission, an intermediate layer, and a second EL layer having a light-emitting layer containing a phosphorescent compound exhibiting green light emission and a light-emitting layer containing a phosphorescent compound exhibiting red light emission, which are stacked in this order. Silver was used for the second electrode 1203. layer, an intermediate layer, and a second EL layer having a light-emitting layer containing a phosphorescent compound exhibiting green light emission and a light-emitting layer containing a phosphorescent compound exhibiting red light emission, which are stacked in this order. Silver was used for the second electrode 1203. stacked in this order. Silver was used for the second electrode 1203. stacked in this order. Silver was used for the second electrode 1203.

[0159] Next, a photocurable resin containing zeolite, which is the sealing material 1227, was applied and cured by irradiating with ultraviolet light. Then, using an ultraviolet curable adhesive, the support substrate 1229 and a substrate having a thin glass layer and a polyethylene terephthalate (PET) layer, which is the sealing substrate 1228, were bonded together. Next, a photocurable resin containing zeolite, which is the sealing material 1227, was applied and cured by irradiating with ultraviolet light. Then, using an ultraviolet curable adhesive, the support substrate 1229 and a substrate having a thin glass layer and a polyethylene terephthalate (PET) layer, which is the sealing substrate 1228, were bonded together. Next, a photocurable resin containing zeolite, which is the sealing material 1227, was applied and cured by irradiating with ultraviolet light. Then, using an ultraviolet curable adhesive, the support substrate 1229 and a substrate having a thin glass layer and a polyethylene terephthalate (PET) layer, which is the sealing substrate 1228, were bonded together. Next, a photocurable resin containing zeolite, which is the sealing material 1227, was applied and cured by irradiating with ultraviolet light. Then, using an ultraviolet curable adhesive, the support substrate 1229 and a substrate having a thin glass layer and a polyethylene terephthalate (PET) layer, which is the sealing substrate 1228, were bonded together.

[0160] The operating characteristics of the light-emitting panel obtained as described above were measured. The voltage-luminance characteristics of the light-emitting panel at this time are shown as "initial" in the legend of FIG. 7. Also, the emission spectrum of the light-emitting panel is shown in FIG. 8. As shown in FIG. 8, it was found that the light-emitting panel of this embodiment shows an emission spectrum containing light derived from each of a fluorescent compound exhibiting blue light emission, a phosphorescent compound exhibiting green light emission, and a phosphorescent compound exhibiting red light emission. Next, the operating characteristics of the light-emitting panel obtained as described above were measured. The voltage-luminance characteristics of the light-emitting panel at this time are shown as "initial" in the legend of FIG. 7. Also, the emission spectrum of the light-emitting panel is shown in FIG. 8. As shown in FIG. 8, it was found that the light-emitting panel of this embodiment shows an emission spectrum containing light derived from each of a fluorescent compound exhibiting blue light emission, a phosphorescent compound exhibiting green light emission, and a phosphorescent compound exhibiting red light emission. Next, the operating characteristics of the light-emitting panel obtained as described above were measured. The voltage-luminance characteristics of the light-emitting panel at this time are shown as "initial" in the legend of FIG. 7. Also, the emission spectrum of the light-emitting panel is shown in FIG. 8. As shown in FIG. 8, it was found that the light-emitting panel of this embodiment shows an emission spectrum containing light derived from each of a fluorescent compound exhibiting blue light emission, a phosphorescent compound exhibiting green light emission, and a phosphorescent compound exhibiting red light emission. Next, the operating characteristics of the light-emitting panel obtained as described above were measured. The voltage-luminance characteristics of the light-emitting panel at this time are shown as "initial" in the legend of FIG. 7. Also, the emission spectrum of the light-emitting panel is shown in FIG. 8. As shown in FIG. 8, it was found that the light-emitting panel of this embodiment shows an emission spectrum containing light derived from each of a fluorescent compound exhibiting blue light emission, a phosphorescent compound exhibiting green light emission, and a phosphorescent compound exhibiting red light emission. Next, the operating characteristics of the light-emitting panel obtained as described above were measured. The voltage-luminance characteristics of the light-emitting panel at this time are shown as "initial" in the legend of FIG. 7. Also, the emission spectrum of the light-emitting panel is shown in FIG. 8. As shown in FIG. 8, it was found that the light-emitting panel of this embodiment shows an emission spectrum containing light derived from each of a fluorescent compound exhibiting blue light emission, a phosphorescent compound exhibiting green light emission, and a phosphorescent compound exhibiting red light emission.

[0161] Thereafter, a reliability test of the light-emitting device using the light-emitting panel was conducted. As the reliability test, the The light panel was made to flash 3,000 or 10,000 times at intervals. A current of 2A was passed through Nell for 50 milliseconds (ms). The interval between light emission (the time when no light was emitted) was I set it to 10 seconds.

[0162] Figure 7 shows the voltage-luminance characteristics of the light-emitting panel after 3,000 flashes and after 10,000 flashes. show.

[0163] Figure 7 shows that the voltage-luminance characteristics of the light-emitting panel remained almost the same as before the reliability test, even after 10,000 flashes. There was almost no change, and no deterioration of the light-emitting panel was observed. From this, one aspect of the present invention The reliability of the light-emitting device was demonstrated. [Explanation of Symbols]

[0164] 100A Light-emitting device 100B Light-emitting device 110 Switching Circuit 120 light-emitting panels 130 Drive Circuit 132 Start switch 140A constant current DC power supply 140B constant current DC power supply 150 Counter Circuit 201 First electrode 203 EL layer 203a EL layer 203b EL layer 205 Second electrode 207 Middle Class 301 Hole injection layer 302 Hole transport layer 303 Emitting layer 304 Electron transport layer 305 Electron injection layer 401 Support substrate 403 Light-emitting element 405 Sealing substrate 407 Sealing material 409a terminal 409b terminal 411a Light extraction structure 411b Light extraction structure 413 Planarization layer 415 Space 417 Auxiliary wiring 419 Insulating layer 421 First electrode 423 EL layer 425 Second electrode 1201 First electrode 1202 EL layer 1203 Second electrode 1205 Bulkhead 1206 Auxiliary wiring 1209 Light extraction structure 1210 terminal 1220 Support board 1224 Insulating film 1227 Sealing material 1228 Sealing substrate 1229 Support substrate 1250 light-emitting element 7300 Digital Still Camera 7301 enclosure 7303 Light-emitting part 7304 Lens 7305 Non-emitting part 7310 Light-emitting device 7350 Mobile phone 7351 enclosure 7352 Display section 7353 Light-emitting part 7354 Lens 7355 Non-emitting part 7360 Light-emitting device

Claims

[Claim 1] A switching circuit that is supplied with a constant current and a control pulse signal, and that can supply a constant current pulse, A constant current power supply capable of supplying the aforementioned constant current, A drive circuit that can supply the aforementioned control pulse signal and includes a start switch, The light-emitting panel to which the constant current pulse is supplied comprises, The drive circuit is a light-emitting device that outputs the control pulse signal in conjunction with the opening and closing operation of the start switch, such that the switching circuit supplies a constant current with a half-width of 1 millisecond or more and 1000 milliseconds or less.

Images