Light-emitting device, display device, photoelectric conversion device, electronic device, lighting device, and mobile object

Abstract

To increase intensity of light emitted in the frontal direction.SOLUTION: A light emitting device includes an organic light emitting element 100 having a reflective surface S2, a first electrode 2, an organic layer 3 including a light emitting layer 31, a second electrode 4, and a light extraction structure 10. The light emitting layer 31 includes a first light emitting material. A wavelength included in a peak wavelength range of a PL spectrum of the first light emitting material is a first wavelength λ1. An optical distance Lb between the light emitting layer 31 and the reflective surface S2 is set to be a value that allows rays of light having the first wavelength λ1 and respectively traveling in a first direction D1 and in a second direction D2 to be intensified, the first direction D1 and the second direction D2 intersecting a direction normal to a main surface S1 of a substrate 1. The thus intensified rays of light respectively reach a first inclined portion 21a and a second inclined portion 21b of the light extraction structure 10, and are then respectively emitted in a third direction D3 and in a fourth direction D4 that are substantially orthogonal to the main surface S1 of the substrate 1.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a light-emitting device, a display device, a photoelectric conversion device, an electronic device, a lighting device, and a mobile object. [Background technology]

[0002] An organic EL element is a light-emitting element that has a pair of electrodes and an organic compound layer, including a light-emitting layer, disposed between them. Taking advantage of their excellent features, such as surface emission, light weight, and visibility, organic EL elements are increasingly being put to practical use as light-emitting devices such as thin displays, lighting fixtures, head-mounted displays, and light sources for print heads in electrophotographic printers.

[0003] Incidentally, when using an organic EL element, light emitted in the front direction of the organic EL element is often used, so it is important to increase the intensity of light emitted in the front direction of the organic EL element.

[0004] Patent Document 1 describes providing an organic EL element with a resonator structure and adjusting the thickness of the resonator structure so that light at the peak wavelength of the spectrum of light to be extracted is intensified. According to the configuration of Patent Document 1, light at the peak wavelength of the spectrum of the light-emitting material is intensified when emitted in the normal direction to the light-emitting layer, improving the intensity of light emitted in the front direction.

[0005] On the other hand, Patent Document 2 discloses a technology for improving color shift depending on the viewing direction of a display device, in which the optical distance between the light-emitting layer of an organic EL element and a reflective film is made larger than the peak value of the emission spectrum of light emitted by the light-emitting layer. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 01 / 039554 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-115679 Summary of the Invention [Problem to be solved by the invention]

[0007] In Patent Document 2, the organic EL element is configured such that the intensity of light emitted in a direction inclined relative to the front direction is higher than the intensity of light emitted in the front direction. Therefore, the intensity of light emitted in the front direction is not increased. Furthermore, even with Patent Document 1, the improvement in the intensity of light emitted in the front direction is still insufficient. In other words, there has been a problem in the past that the intensity of light emitted in the front direction of light-emitting devices is not yet sufficiently high.

[0008] In view of the above-mentioned problems, an object of the present invention is to increase the intensity of light emitted in the front direction. [Means for solving the problem]

[0009] a light-emitting device according to one aspect of the present invention, the light-emitting device including an organic light-emitting element disposed on a substrate, the organic light-emitting element including a first electrode, a second electrode, an organic layer including a light-emitting layer sandwiched between the first electrode and the second electrode, a light-extraction structure disposed on a light-emitting side of the organic layer, and a reflecting surface disposed so as to sandwich the organic layer between the light-extraction structure and the organic layer; the light-emitting layer including a first light-emitting material; and an optical distance between the light-emitting layer and the reflecting surface, the optical distance being such that, when a wavelength included in a peak wavelength range of a PL spectrum of the first light-emitting material is defined as a first wavelength, light of the first wavelength traveling through the light-emitting layer in a first direction intersecting a normal direction to the main surface of the substrate and light of the first wavelength traveling through the light-emitting layer in a second direction different from the first direction intersecting the normal direction to the main surface of the substrate are each intensified. the angle between the normal direction of the main surface of the substrate and the first direction and the angle between the normal direction of the main surface of the substrate and the second direction have the same absolute value; the light extraction structure has a first inclined portion and a second inclined portion; first incident light, which is light of the first wavelength that travels through the light-emitting layer in the first direction and reaches the first inclined portion, is refracted at the first inclined portion and is emitted from the light extraction structure in a third direction; second incident light, which is light of the first wavelength that travels through the light-emitting layer in the second direction and reaches the second inclined portion, is refracted at the second inclined portion and is emitted from the light extraction structure in a fourth direction; and the absolute values ​​of the angle between the normal direction of the main surface of the substrate and the third direction and the angle between the normal direction of the main surface of the substrate and the fourth direction are both between 0 degrees and 5 degrees. [Effects of the Invention]

[0010] According to the present invention, the intensity of light emitted in the front direction can be increased. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic cross-sectional view of an organic light-emitting element included in a light-emitting device according to a first embodiment. [Figure 2] FIG. 2 is a schematic cross-sectional view for explaining optical interference in an organic light-emitting element included in the light-emitting device of the first embodiment. [Figure 3] 1 is a schematic diagram showing the angular distribution of light intensity in an organic compound layer of an organic light-emitting element. [Figure 4] FIG. 2 is a schematic cross-sectional view showing the positional relationship between a light-emitting layer and a light extraction structure in the first embodiment. [Figure 5] 3A and 3B are schematic diagrams showing the inclination angle of an inclined portion and the traveling direction of light in the inclined portion. [Figure 6] 1A is a plan view of an example of a first embodiment, and FIG. 1B and FIG. 1C are cross-sectional views of the example of a first embodiment. [Figure 7] 1A is a plan view of an example of a first embodiment, and FIG. 1B and FIG. 1C are cross-sectional views of the example of a first embodiment. [Figure 8] FIG. 10 is a schematic cross-sectional view for explaining optical interference in an organic light-emitting element included in a light-emitting device according to a second embodiment. [Figure 9] FIG. 10 is a schematic cross-sectional view of a light emitting device according to a third embodiment. [Figure 10] FIG. 10 is a schematic cross-sectional view of a light emitting device according to a fourth embodiment. [Figure 11] FIG. 1 is a schematic diagram illustrating an example of a display device. [Figure 12] 1A is a schematic diagram illustrating an example of a photoelectric conversion device, and FIG. 1B is a schematic diagram illustrating an example of an electronic device. [Figure 13] FIG. 1A is a schematic diagram showing an example of a display device, and FIG. 1B is a schematic diagram showing an example of a foldable display device. [Figure 14] 1A is a schematic diagram showing an example of a lighting device, and FIG. 1B is a schematic diagram showing an example of an automobile having a vehicle lamp. [Figure 15] FIG. 1A is a schematic diagram showing an example of a wearable device, and FIG. 1B is a schematic diagram showing an example of a wearable device having an imaging device. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description and drawings, common reference numerals are used to designate components common to multiple drawings. Therefore, common components will be described with mutual reference to multiple drawings, and descriptions of components with common reference numerals will be omitted as appropriate.

[0013] In this specification, terms indicating arrangement, such as "above" and "below," are used for convenience in describing the positional relationship between components with reference to the drawings. Furthermore, the positional relationship between components changes as appropriate depending on the direction in which each component is depicted. Therefore, the terms are not limited to those used in the specification and can be rephrased appropriately depending on the situation. Furthermore, the terms "above" and "below" do not necessarily require that the components be directly above or below each other and in direct contact with each other. For example, the expression "component B on component A" does not necessarily require that component B be directly above and in contact with component A, and does not exclude the inclusion of other components between component A and component B.

[0014] (First embodiment) [Configuration of light-emitting device] The configuration of the light emitting device according to the first embodiment of the present invention will be described below. Fig. 1 is a schematic cross-sectional view of an organic light emitting element included in the light emitting device according to the first embodiment.

[0015] The organic light-emitting element 100 has a structure in which, from the main surface S1 side (main surface side) of the substrate 1, a reflective layer 11, a lower electrode 2 which is a first electrode, an organic compound layer 3 which is an organic layer, an upper electrode 4 which is a second electrode, and a light extraction structure 10 are arranged in this order. In other words, the reflective layer 11 is arranged on the main surface S1 of the substrate 1, the lower electrode 2 is arranged on the reflective layer 11, the organic compound layer 3 is arranged on the lower electrode 2, the upper electrode 4 is arranged on the organic compound layer 3, and the light extraction structure 10 is arranged on the upper electrode 4. The organic compound layer 3 includes a light-emitting layer 31 and is sandwiched between the lower electrode 2 and the upper electrode 4.

[0016] The substrate 1 is made of a material capable of supporting the lower electrode 2, organic compound layer 3, upper electrode 4, etc. formed thereon, and is preferably a semiconductor substrate such as a glass substrate, a plastic substrate, or a silicon substrate. Switching elements such as transistors (not shown), wiring, interlayer insulating films, etc. may be formed on the substrate 1. The transistor may be a MOS transistor formed inside the semiconductor substrate, or may be a TFT.

[0017] The lower electrode 2 can be made of a transparent conductive oxide such as ITO or IZO, a metal material such as Al or Ag, or an alloy of these with Si, Cu, Ni, Nd, Ti, or the like. When a metal material is used for the lower electrode 2, a barrier layer may be provided on the surface on the light-emitting side. Examples of materials for the barrier layer include metals such as Ti, W, Mo, and Au, or alloys thereof, or transparent conductive oxides such as ITO and IZO.

[0018] The organic compound layer 3 is disposed on the lower electrode 2 and can be formed by vapor deposition, spin coating, inkjet printing, or the like. The organic compound layer 3 includes a light-emitting layer 31 made of an organic material. The organic compound layer 3 may be composed of multiple layers, such as a hole injection layer, a hole transport layer, an electron blocking layer, the light-emitting layer 31, a hole blocking layer, an electron transport layer, an electron injection layer, and a charge generation layer. The configuration of the organic compound layer 3 is not particularly limited, and it may further include other layers, or it may not include at least one layer other than the light-emitting layer 31. Furthermore, each layer constituting the organic compound layer 3 may be composed of multiple layers, and the light-emitting layer 31 may include a first light-emitting layer and a second light-emitting layer. When the light-emitting layer 31 has multiple light-emitting layers, the light-emitting layers may be stacked adjacent to each other so as to be in contact with each other, or may be separated by another layer.

[0019] The light-emitting layer 31 contains a first light-emitting material. The first light-emitting material is, for example, any one of a blue light-emitting material, a green light-emitting material, and a red light-emitting material. When the light-emitting layer 31 has multiple light-emitting layers, each light-emitting layer may contain one type of light-emitting material. Alternatively, the light-emitting layer 31 may contain two or more types of light-emitting materials.

[0020] The light-emitting material contained in the light-emitting layer 31 has a photoluminescence (PL) spectrum, which is the wavelength dependency of the light-emitting intensity in response to excitation light. The PL spectrum of the light-emitting material exhibits a spectral shape in which the light-emitting intensity reaches a maximum at a wavelength within a predetermined wavelength range. In this specification, the wavelength at which the light-emitting intensity reaches a maximum in the PL spectrum is referred to as the peak wavelength λ p (nm), (λ p -5) nm or more (λ p +5) nm or less is defined as the peak wavelength region. Note that if there are two or more wavelengths at which the emission intensity is maximized in the PL spectrum, i.e., if there is a wavelength of a primary peak at which the emission intensity is maximized and a wavelength of a secondary peak at which the emission intensity is the next maximum, either wavelength may be defined as the peak wavelength. Note that in this embodiment, the wavelength of the primary peak at which the emission intensity is maximized in the PL spectrum is defined as the peak wavelength.

[0021] The upper electrode 4 is disposed on the organic compound layer 3 and has a translucent property so as to transmit light emitted from the light-emitting layer 31. The upper electrode 4 may also be made of a semi-transmissive reflective material that transmits part of the light that reaches its surface and reflects the other part (i.e., semi-transmissive reflective). The upper electrode 4 may be made of a transparent conductive oxide such as ITO or IZO, or a semi-transmissive reflective material made of a thin film of an elemental metal such as aluminum, silver, or gold, an alkali metal such as lithium or cesium, or an alkaline earth metal such as magnesium, calcium, or barium, or an alloy material containing these metal materials. An alloy primarily composed of magnesium or silver is particularly preferred as the semi-transmissive reflective material. The upper electrode 4 may also be made of a laminated structure of the above materials as long as it has a desired transmittance.

[0022] Holes injected from the anode and electrons injected from the cathode recombine in the organic compound layer 3, and light is emitted from the light-emitting layer 31. In this embodiment, the lower electrode 2 may be the anode and the upper electrode 4 may be the cathode, or the lower electrode 2 may be the cathode and the upper electrode 4 may be the anode.

[0023] The reflective layer 11 is provided on the light-reflecting side of the organic compound layer 3 in the organic light-emitting element 100. Here, the light-reflecting side refers to the direction toward the lower electrode 2 when viewed from the organic compound layer 3. The reflective layer 11 is preferably made of a highly reflective material, and is preferably made of a metal material such as Al or Ag, or an alloy of these materials with Si, Cu, Ni, Nd, Ti, or the like added thereto. The reflective layer 11 includes a reflective surface S2, and in this case, the upper surface of the reflective layer 11 is the reflective surface S2. The reflective surface S2 may be the lower surface of the reflective layer 11 or may be disposed inside the reflective layer 11. The reflective surface S2 is disposed opposite the light-extraction structure 10 across the organic compound layer 3. In other words, the organic compound layer 3 is disposed between the reflective surface S2 and the light-extraction structure 10.

[0024] Furthermore, when the lower electrode 2 is made of a highly reflective material, the lower electrode 2 may also serve as the reflective layer 11. Furthermore, a transparent conductive oxide such as ITO or IZO may be present on and in contact with the reflective layer 11.

[0025] An optical interference layer 12 for adjusting the optical distance between the reflecting surface S2 and the light-emitting layer 31 may be provided between the reflecting surface S2 and the lower electrode 2. The optical interference layer 12 is preferably made of a material with high optical transmittance in the visible light range, such as an inorganic material such as silicon nitride (SiN), silicon oxynitride (SiON), or silicon oxide (SiO), or an organic material such as an acrylic resin, an epoxy resin, or a silicone resin. When the optical interference layer 12 is provided, the lower electrode 2 preferably has high optical transmittance and is preferably made of a transparent conductive oxide such as ITO or IZO.

[0026] The light extraction structure 10 is provided on the light emission side of the upper electrode 4. Here, the light emission side is the direction toward the upper electrode 4 when viewed from the organic compound layer 3.

[0027] The light outcoupling structure 10 has an inclined portion 21. As will be described in detail later, when light of a first wavelength λ1 traveling in a direction forming an angle θ1 with the normal direction of the main surface S1 of the substrate 1 in the light-emitting layer 31 reaches the inclined portion 21, the light is refracted at the inclined portion 21 and is emitted in a direction approximately perpendicular to the main surface S1 of the substrate 1. The light outcoupling structure 10 has a plurality of inclined portions, including at least a first inclined portion 21a and a second inclined portion 21b.

[0028] Light of a first wavelength λ1 traveling through the light-emitting layer 31 in a first direction D1 is incident on the first inclined portion 21a as a first incident light, where it is refracted, and then emitted in a third direction D3. Light of a first wavelength λ1 traveling through the light-emitting layer 31 in a second direction D2 is incident on the second inclined portion 21b as a second incident light, where it is refracted, and then emitted in a fourth direction D4. The first direction D1 and the second direction D2 both form an angle θ1 with the normal direction to the main surface S1 of the substrate 1 (where θ1 is greater than 0 degrees). That is, the first direction D1 and the second direction D2 intersect with the normal direction to the main surface S1 of the substrate 1, and the first direction D1 and the second direction D2 are different directions. Furthermore, the angle between the normal direction to the main surface S1 of the substrate 1 and the first direction D1 and the angle between the normal direction to the main surface S1 of the substrate 1 and the second direction D2 have the same absolute value. The third direction D3 and the fourth direction D4 are both substantially perpendicular to the main surface S1 of the substrate 1. Here, the "substantially perpendicular to the main surface S1 of the substrate 1" refers to a direction that forms an angle with the direction perpendicular to the main surface S1 of the substrate 1 with an absolute value of 0 degrees or more and 5 degrees or less.

[0029] The light output section 50 is provided on the light output side of the light extraction structure 10. The light output section 50 constitutes a region through which light output from the light extraction structure 10 travels. The refractive index of the light output section 50 is different from that of the light extraction structure 10. As a result, when light is incident at an angle other than 90 degrees with respect to the inclined section 21 of the light extraction structure 10, it is refracted at the inclined section 21, changing the direction of travel of the light. The refractive index of the light output section 50 may be different from that of the light extraction structure 10, and may be greater or smaller than that of the light extraction structure 10. The difference in refractive index between the light output section 50 and the light extraction structure 10 is preferably 0.1 or greater, more preferably 0.3 or greater, and even more preferably 0.5 or greater.

[0030] The light extraction structure 10 is preferably made of a material that has high light transmittance in the visible light range. Examples of materials that make up the light extraction structure 10 include organic materials such as acrylic resin, epoxy resin, and silicone resin, and inorganic materials such as silicon nitride (SiN), silicon oxynitride (SiON), and silicon oxide (SiO). The light extraction structure 10 preferably has high light transmittance over the entire visible light range (380 nm to 780 nm), but may also have high light transmittance in a partial wavelength range within the visible light range.

[0031] The light output unit 50 is preferably made of a material with high optical transparency. The material constituting the light output unit 50 may be a solid material or a gaseous material. Examples of gaseous materials include air, oxygen, nitrogen, and carbon dioxide. Examples of solid materials include organic materials such as acrylic resin, epoxy resin, and silicone resin, and inorganic materials such as silicon nitride (SiN), silicon oxynitride (SiON), and silicon oxide (SiO). Among these, gaseous materials are particularly preferred because they can easily increase the refractive index difference between the light extraction structure 10 and the light output unit 50. The light output unit 50 preferably has high optical transmittance over the entire visible light range (380 nm to 780 nm), but may also have high optical transmittance in a partial wavelength range within the visible light range.

[0032] [Features of the Light-Emitting Device of the First Embodiment] Next, one feature and effect of the light emitting device of the first embodiment will be described with reference to FIGS.

[0033] <(1) Optical interference conditions> 2 is a schematic cross-sectional view for explaining optical interference in the organic light-emitting element included in the light-emitting device of Embodiment 1. Using FIG. 2, optical conditions related to the light-emitting position of the light-emitting layer 31 and the position of the reflecting surface S2 in the organic light-emitting element of this embodiment will be explained.

[0034] The light emitted by the light-emitting layer 31 includes first light L1 and second light L2. The first light L1 is light that is emitted from the light-emitting layer 31 toward the first electrode (lower electrode 2), reflected by the reflecting surface S2, and travels in a first direction D1 toward the second electrode (upper electrode 4). In other words, the first light L1 is light that is emitted from the light-emitting layer 31, travels toward the light reflecting side, is reflected by the reflecting surface S2, and then travels toward the light emitting side and is extracted from the light extraction structure 10 to the light emitting unit 50. The second light L2 is light that is emitted from the light-emitting layer 31 toward the second electrode (upper electrode 4) in the first direction D1. In other words, the second light L2 is light that is emitted directly from the light-emitting layer 31 toward the light emitting side and travels in the first direction D1. The first light L1 and the second light L2 are lights of a first wavelength λ1, and in this embodiment, the optical distance Lb between the light-emitting layer 31 and the reflecting surface S2 is adjusted so that the first light L1 and the second light L2 are constructively interfered with each other. Here, the first wavelength λ1 is within the peak wavelength range (λ ) of the PL spectrum of the first light-emitting material contained in the light-emitting layer 31. p1 -5) nm or more (λ p1 The peak wavelength of the PL spectrum of the first light-emitting material contained in the light-emitting layer 31 is λ 1 +5) nm or less. p1 (nm). The first direction D1 is inclined from the normal direction to the main surface S1 of the substrate 1, and the angle θ1 formed between the normal direction to the main surface S1 of the substrate 1 and the first direction D1 is greater than 0 degrees and smaller than 90 degrees.

[0035] Similarly to the first direction D1, the light of the first wavelength λ1 traveling through the light-emitting layer 31 in the second direction D2 is also intensified by optical interference. Specifically, the first light L1' and the second light L2' are intensified by optical interference. Here, the first light L1' is light emitted from the light-emitting layer 31 toward the first electrode (lower electrode 2), reflected by the reflecting surface S2, and traveling in the second direction D2 toward the second electrode (upper electrode 4). The second light L2' is light emitted from the light-emitting layer 31 toward the second electrode (upper electrode 4) in the second direction D2.

[0036] The optical distance Lb between the light-emitting layer 31 and the reflecting surface S2 is adjusted to satisfy the following formula (1). When the following formula (1) is satisfied, the first light L1 and the second light L2 constructively interact with each other, thereby strengthening the light of the first wavelength λ1 traveling in the first direction D1 through the light-emitting layer 31. Furthermore, the first' light L1' and the second' light L2' constructively interact with each other, thereby strengthening the light of the first wavelength λ1 traveling in the second direction D2 through the light-emitting layer 31. In addition to adjusting the optical distance Lb, the phase shift φb at the reflecting surface S2 may also be adjusted. Lb / cosθ1×(1+sin(90-2θ1))=λ1×(m-φb / 360)...Equation (1)

[0037] In formula (1), Lb represents the optical distance (unit: nm) between the light-emitting layer 31 and the reflecting surface S2, θ1 represents the angle (unit: degrees) between the normal to the main surface S1 of the substrate 1 and the first direction D1, λ1 represents a wavelength (unit: nm) included in the peak wavelength range of the PL spectrum of the first light-emitting material contained in the light-emitting layer 31, and φb represents the phase shift (unit: degrees) upon reflection on the reflecting surface S2. Furthermore, m is an integer equal to or greater than 0.

[0038] FIG. 3 shows the angular distribution of the light intensity in the organic compound layer of a typical organic light-emitting device. FIG. 3 shows the total amount of luminous flux emitted for each solid angle when the light emitted in the organic compound layer has a constant luminance. FIG. 3 converts the numerical range of the solid angle into the numerical range of the angle between the light propagation direction and the normal direction, and shows the relative light intensity when the light intensity at angles of 0 to 5 degrees is set to 1. As shown in FIG. 3, the amount of light traveling at wider angles is greater than the amount of light traveling at angles of 0 to 5 degrees, i.e., light traveling approximately perpendicular to the main surface of the substrate. Furthermore, although not shown in FIG. 3, the amount of light traveling in a direction greater than 0 degrees with respect to the normal direction is greater than the amount of light traveling in a direction at an angle of 0 degrees with respect to the normal direction. The amount of light increases as the solid angle increases. Thus, it can be seen that the amount of light emitted from the light-emitting layer traveling in a direction inclined relative to the normal direction is greater than the amount of light traveling approximately perpendicular to the main surface of the substrate.

[0039] Here, light having a wavelength included in the peak wavelength range of the PL spectrum of the first light-emitting material is light with particularly high intensity among the light emitted from the first light-emitting material. Therefore, the amount of light can be increased by constructively mixing light of this wavelength with light reflected from the reflecting surface S2 when the light travels in the organic compound layer 3 in the normal direction to the main surface S1 of the substrate 1, rather than constructively mixing light of this wavelength with light reflected from the reflecting surface S2 when the light travels in the normal direction to the main surface S1. That is, in this embodiment, the light emitted from the light-emitting layer 31 is made stronger by constructively mixing light of a wavelength included in the peak wavelength range of the PL spectrum of the first light-emitting material when the light travels in the direction oblique to the normal direction.

[0040] <(2) Positional relationship between the light-emitting point in the light-emitting layer and the sloped part of the light extraction structure> Fig. 4 is a schematic cross-sectional view showing the positional relationship between the light-emitting layer and the light-extraction structure. More specifically, Fig. 4 shows a case where light of a first wavelength λ1 traveling in a first direction D1 and a second direction 2 in the light-emitting layer 31 is emitted in a third direction D3 and a fourth direction D4 at the inclined portion 21 of the light-extraction structure 10. The positional relationship between the light-emitting point and the inclined portion 21 in the organic light-emitting element included in the light-emitting device of this embodiment will be described using Fig. 4.

[0041] As described above, the inclination angle of the first inclined portion 21a is set so that when light having a first wavelength λ1 traveling in the first direction D1 through the light-emitting layer 31 enters the first inclined portion 21a, it is refracted at the first inclined portion 21a and is emitted from the light-extraction structure 10 in the third direction D3. Furthermore, the inclination angle of the second inclined portion 21b is set so that when light having a first wavelength λ1 traveling in the second direction D2 through the light-emitting layer 31 enters the second inclined portion 21b, it is refracted at the second inclined portion 21b and is emitted from the light-extraction structure 10 in the fourth direction D4. In the following description, the light having a first wavelength λ1 traveling in the first direction D1 through the light-emitting layer 31 that enters the first inclined portion 21a and is emitted is referred to as light L10. Furthermore, the light having a first wavelength λ1 traveling in the second direction D2 through the light-emitting layer 31 that enters the second inclined portion 21b and is emitted is referred to as light L20. Both light L10 and light L20 are included in the light that travels in a direction that forms an angle θ1 with the normal direction to the main surface S1 within the light-emitting layer 31. Here, the light-emitting point of light L10 in the light-emitting layer 31 is defined as a first light-emitting point 91a, and the light-emitting point of light L20 in the light-emitting layer 31 is defined as a second light-emitting point 91b.

[0042] At this time, the vertical distance D between the first light-emitting point 91a and the arrival position of the light L10 on the first inclined portion 21a (hereinafter referred to as the light extraction point) is a and horizontal distance W a is expressed by the following equations (2) and (3). D a =D1+D2++D n-1 +D n ...Equation (2) W a =W1+W2++W n-1 +W n ...Equation (3)

[0043] Furthermore, equation (3) is transformed into equation (3)′ below. W a =D1×tanθ1 +D2×tan(arcsin(sinθ1×N1 / N2)) +··· +D n-1 ×tan(arcsin(sinθ1×N1 / N n-1 )) +D n ×tan(arcsin(sinθ1×N1 / N n ))...Equation (3)′

[0044] Here, if there are n components from the light emitting layer 31 to the light extraction point in the light extraction structure 10, the light emitting layer 31 is considered to be the first component, and the light extraction structure 10 is considered to be the nth component from the light emitting layer 31.

[0045] D1, D2, . . ., D n-1 , D n Each of these corresponds to the thickness of each component from the light emitting layer 31 to the light extraction point of the light extraction structure 10. That is, D1 is the thickness of the first component, the light emitting layer 31, D2 is the thickness of the second component, and D n is the thickness from the bottom surface of the light extraction structure 10, which is the nth component, to the light extraction point. Therefore, the vertical distance D a are D1, D2, . . ., D n-1 , D n Since it is the sum of the above, equation (2) holds.

[0046] Also, W1, W2, ..., W n-1 , W n correspond to the horizontal distance of the light passing through the components from the light emitting layer 31 to the light extraction point of the light extraction structure 10. a are W1, W2, . . ., W n-1 , W nHere, the horizontal distance of the portion of each component through which light passes is determined by the angle θ1 between the first direction D1 and the normal direction of the main surface S1 of the substrate 1, the refractive index N1 of the light-emitting layer 31, and the refractive indexes N2 to N n and the thicknesses D1 to D of each component n is required from.

[0047] Further, the vertical distance D between the second light emitting point 91b and the arrival position (light extraction point) of the light L20 on the second inclined portion 21b is b and horizontal distance W b can be obtained in a similar manner. In this embodiment, the positional relationship between the first light-emitting point 91a and the first inclined portion 21a and the positional relationship between the second light-emitting point 91b and the second inclined portion 21b may be the same or different. When they are the same, Da = Db and Wa = Wb are established. Furthermore, the positional relationship between the first light-emitting point 91a and the first inclined portion 21a and the positional relationship between the second light-emitting point 91b and the second inclined portion 21b may be in a line-symmetric relationship with respect to the normal to the main surface S1 that passes through the center of the light-emitting region 101.

[0048] As a result, light L10 emitted from the first light-emitting point 91a and traveling in the first direction D1 is incident on the first inclined portion 21a of the light extraction structure 10, and light L20 emitted from the second light-emitting point 91b and traveling in the second direction D2 is incident on the second inclined portion 21b of the light extraction structure 10.

[0049] (3) Inclination angle of the inclined portion of the light extraction structure Fig. 5 shows the inclination angle ψ of the inclined portion 21 of the light outcoupling structure 10, the traveling direction of light reaching the inclined portion 21, and the traveling direction of light exiting the inclined portion 21. The inclination angle ψ of the inclined portion 21 of the organic light-emitting element of this embodiment will be described using Fig. 5. Fig. 5 is an enlarged view of the first inclined portion 21a of the light outcoupling structure 10.

[0050] The inclination angle ψ of the first inclined portion 21a is set so that light traveling in the first direction D1 through the light-emitting layer 31 is refracted at the first inclined portion 21a when it reaches the first inclined portion 21a and is emitted in a third direction D3 from the light-outcoupling structure 10. The inclination angle ψ of the second inclined portion 21b is set so that light traveling in the second direction D2 through the light-emitting layer 31 is refracted at the second inclined portion 21b when it reaches the second inclined portion 21b and is emitted in a fourth direction D4 from the light-outcoupling structure 10. Here, the inclination angle of the first inclined portion 21a will be considered, assuming that when light traveling in the first direction D1 through the light-emitting layer 31 reaches the first inclined portion 21a, the light that enters the first inclined portion 21a is referred to as incident light 71, and the light that exits from the first inclined portion 21b is referred to as exit light 81.

[0051] The angle θ between the third direction D3, which is the traveling direction of the emitted light 81, and the normal direction of the main surface S1 ex and the angle ψ of the first inclined portion 21a satisfy the following formulas (4) and (5) according to Snell's equation. θ n =arcsin(sinθ1′×N1 / N n )...Equation (4) θ ex =-arcsin(sin(-θ n +ψ)×N n / N ex )+ψ...Equation (5)

[0052] In the formulas (4) and (5), N1 represents the refractive index of the light-emitting layer 31, and N n represents the refractive index of the light extraction structure 10, and N ex represents the refractive index of the light emitting portion 50. n represents the angle (degrees) between the traveling direction of the incident light 71 incident on the first inclined portion 21a and the normal direction of the main surface S1, and θ1′ represents the angle (degrees) between the first direction D1, which is the traveling direction in the light-emitting layer 31 of the incident light 71 incident on the first inclined portion 21a, and the normal direction of the main surface S1. exrepresents the angle (degrees) between the third direction D3, which is the traveling direction of the outgoing light 81 emitted from the inclined portion 21, and the normal direction of the main surface S1, and ψ represents the angle (degrees) between the portion of the first inclined portion 21a where the incident light 71 is incident and a straight line 63 parallel to the main surface S1. n , θ1′, θ ex is a positive angle when turned clockwise and a negative angle when turned counterclockwise, with the normal 60 of the main surface S1 as the starting line, and ψ is a positive angle when turned clockwise and a negative angle when turned counterclockwise, with the line 63 parallel to the main surface S1 as the starting line.

[0053] Therefore, in this embodiment, the angle θ between the third direction D3, which is the traveling direction of the emitted light 81, and the normal direction of the main surface S1 is ex The angle ψ of the first inclined portion 21a is set so that the angle θ is approximately 0 degrees. ex The angle ψ of the first inclined portion 21a is set so that the angle θ is between −5 degrees and 5 degrees. ex is θ ex The angle ψ of the first inclined portion 21a is set so that the absolute value of is between 0 and 5 degrees. With this structure, the incident light 71 is refracted at the first inclined portion 21a, and becomes the outgoing light 81 that travels in a direction approximately perpendicular to the main surface S1 of the substrate 1. Note that although the first inclined portion 21a has been described here, the same applies to the second inclined portion 21b.

[0054] As described above, this embodiment employs the following configuration. First, the optical distance Lb between the light-emitting layer 31 and the reflecting surface S2 is adjusted so that light with wavelengths included in the peak wavelength range of the PL spectrum of the first light-emitting material constructively interacts with each other when traveling in a direction inclined relative to the normal direction due to optical interference between the light-emitting layer 31 and the reflecting surface S2. This makes the light emitted from the light-emitting layer 31 more intense in the first direction D1 and the second direction D2. The light traveling in the first direction D1 is incident on the first inclined portion 21a of the light-extraction structure 10, and the light traveling in the second direction D2 is incident on the second inclined portion 21b of the light-extraction structure 10. That is, the intensified light traveling in the first direction D1 is directed toward the first inclined portion 21a of the light-extraction structure 10, and the intensified light traveling in the second direction D2 is directed toward the second inclined portion 21b of the light-extraction structure 10. The inclination angle of the first inclined portion 21a is such that when the light traveling in the first direction D1 through the light-emitting layer 31 enters, it is refracted in a third direction D3, which is a direction substantially perpendicular to the main surface S1. The inclination angle of the second inclined portion 21b is such that when the light traveling in the second direction D2 through the light-emitting layer 31 enters, it is refracted in a fourth direction D4, which is a direction substantially perpendicular to the main surface S1. Thus, by providing multiple inclined portions that refract light in a direction substantially perpendicular to the main surface S1, this embodiment can efficiently extract light with wavelengths falling within the peak wavelength range of the PL spectrum of the first light-emitting material in a direction substantially perpendicular to the main surface S1 of the substrate 1. Light with wavelengths falling within the peak wavelength range of the PL spectrum of the first light-emitting material is particularly intense among the light emitted by the first light-emitting material. Therefore, by efficiently extracting this light, the emission intensity can be increased. As a result, the intensity of light emitted in the forward direction can be increased.

[0055] [Other Features of the Present Embodiment] The value of m in formula (1) is not particularly limited as long as it is an integer of 0 or more, but from the viewpoint of the wavelength range to be intensified, it is preferably 0 or more and 2 or less, more preferably 0 or 1, and particularly preferably 1. When m=1, the emission intensity is intensified highly on the wide-angle side, and in addition, the angle dependency of the emission wavelength is small, which is favorable.

[0056] The angle θ1 between the normal direction to the main surface S1 of the substrate 1 and the first direction D1 is greater than 0 degrees and less than 90 degrees. θ1 is preferably 5 degrees or greater and 45 degrees or less, and more preferably 10 degrees or greater and 30 degrees or less. Setting θ1 to 5 degrees or greater increases the amount of light emitted toward the light-emitting side. Setting θ1 to 45 degrees or less also makes it easier for light traveling from the light-emitting layer 31 in the first direction D1 to reach the inclined portion 21 of the light extraction structure 10, which is preferable.

[0057] Furthermore, the inclination angle of the first inclined portion 21a and the inclination angle of the second inclined portion 21b may be the same or different, as long as light having the first wavelength λ1 traveling in the first direction D1 or the second direction D2 within the light-emitting layer 31 is emitted in a direction substantially perpendicular to the light-emitting portion 50 when the incident light is emitted in a direction substantially perpendicular to the light-emitting portion 50. When the horizontal and vertical distances between the first light-emitting point 91a and the first inclined portion 21a and the horizontal and vertical distances between the second light-emitting point 91b and the second inclined portion 21b are the same, it is preferable that the inclination angle of the first inclined portion 21a and the inclination angle of the second inclined portion 21b are the same.

[0058] Furthermore, the shape of the light extraction structure 10 is not particularly limited, but it is preferable that at least a portion including the first inclined portion 21a and at least a portion including the second inclined portion 21b have a curved surface. When the light extraction structure 10 has at least a portion having a curved surface, the inclination angle of the inclined portion 21 of the light extraction structure 10 changes continuously. Continuously changing the inclination angle of the inclined portion 21 allows for continuous change in the wavelength of light extracted in a direction approximately perpendicular to the main surface S1 of the substrate 1, thereby further improving the light emission efficiency. For example, consider a case where the wavelength of light traveling in the first direction D1 or the second direction D2 in the light-emitting layer 31 and being intensified is 460 nm. In this case, if the light extraction structure 10 has a curved surface in the portion including the inclined portion 21, light with a wavelength of approximately 460 nm near the first direction D1 or the second direction D2 can also be extracted in a direction approximately perpendicular to the first direction D1 or the second direction D2. The shape of the curved surface is not particularly limited, but examples include a spherical surface and an aspherical surface. The spherical surface may be a portion of a spherical surface. In particular, it is preferable that the entire light extraction structure has a curved surface, such as a microlens, which may have either a spherical or aspherical shape.

[0059] In the above explanation, a cross section of the organic light-emitting element has been described, but there may be three or more inclined portions 21 when viewed in a plane relative to the substrate 1. In addition, there may be three or more light-emitting points 91 including the first light-emitting point 91a and the second light-emitting point 91b when viewed in a plane relative to the substrate 1. FIG. 6 shows a plan view and a cross-sectional view of an example of this embodiment. FIG. 6(a) is a plan view of this embodiment, FIG. 6(b) is a cross-section taken along line B in FIG. 6(a), and FIG. 6(c) is a cross-section taken along line C in FIG. 6(a).

[0060] As shown in FIG. 6( a), the light-emitting points 91 are arranged to surround the center 102 of the light-emitting region 101 in a plan view perpendicular to the main surface S1 of the substrate 1. The center 102 of the light-emitting region 101 may be the geometric center of gravity of the light-emitting region 101. In this way, by arranging the light-emitting points 91 outside the center 102 of the light-emitting region 101 in a plan view and surrounding the center 102, the area in which the light-emitting points 91 exist can be expanded. This increases the amount of light that travels in the first direction D1 within the light-emitting layer 31, is intensified by optical interference, and reaches the inclined portion 21. Furthermore, the inclined portion 21 is also arranged to surround the center 102 of the light-emitting region 101 in a plan view. Preferably, the inclined portion 21 is arranged to surround the light-emitting points 91 in a plan view. This structure allows more light of the same solid angle to be extracted in the front direction, thereby further improving the light emission intensity in the front direction, i.e., the light emission intensity in a direction approximately perpendicular to the main surface S1 of the substrate 1. The inclined portion 21 is preferably arranged so as to surround the outer edge of the light emitting region 101 in the plan view. Furthermore, the outer edge of the light extraction structure 10 is preferably arranged so as to surround the inclined portion 21 in the plan view.

[0061] Furthermore, it is preferable that the light-emitting point 91 and the inclined portion 21 are rotationally symmetrical with respect to a normal line passing through the center 102 of the light-emitting region 101. Fig. 7 shows a plan view and a cross-sectional view of an example of this embodiment. Fig. 7(a) is a plan view of this embodiment, Fig. 7(b) is a cross-section taken along line D in Fig. 7(a), and Fig. 6(c) is a cross-section taken along line E in Fig. 6(a).

[0062] As shown in FIG. 7( a), in this example, in a plan view, the light-emitting points 91 are arranged in a figure that is rotationally symmetric with respect to a normal line passing through the center 102 of the light-emitting region 101. Furthermore, in a plan view, the inclined portions 21 are also arranged in a figure that is rotationally symmetric with respect to a normal line passing through the center 102 of the light-emitting region 101. In other words, in a plan view, the light-emitting points 91 are arranged in a circle centered on the center 102 of the light-emitting region 101, and the inclined portions 21 are arranged in a circle centered on the center 102 of the light-emitting region 101. In a plan view, the light-emitting points 91 and the inclined portions 21 are arranged in a concentric circle centered on the center 102 of the light-emitting region 101. This results in uniform and favorable light-emitting characteristics for each azimuth angle. In the case of FIG. 7, the light-extraction structure 10 preferably has a rotationally symmetric shape in a plan view, and is preferably a microlens with a curved surface. The rotationally symmetric portion of the light-extraction structure 10 may be the entire light-extraction structure 10 or a part of the light-extraction structure 10.

[0063] [Other configuration examples of this embodiment] Other configuration examples of this embodiment will be described below.

[0064] In the organic light-emitting element 100 according to this embodiment, an insulating layer 5 may be provided on the outer periphery of the lower electrode 2 so as to cover the edge of the lower electrode 2. That is, the insulating layer 5 may be disposed on the lower electrode 2, and an opening may be provided in the insulating layer 5 so that a portion of the lower electrode 2 is exposed. The lower electrode 2 and the organic compound layer 3 are in contact with each other through the opening in the insulating layer 5. As described above, the insulating layer 5 has the function of defining the light-emitting region 101 of the organic light-emitting element 100 and may be formed to accurately shape the light-emitting region 101 as desired. The insulating layer 5 may also have the function of electrically insulating the lower electrodes 2 of two adjacent organic light-emitting elements 100. The insulating layer 5 is also called a pixel separation layer (PDL), a partition wall, a bank, etc. When the insulating layer 5 is not provided, the light-emitting region 101 is defined by the shape of the lower electrode 2. The insulating layer 5 is formed of an inorganic material such as silicon nitride (SiN), silicon oxynitride (SiON), or silicon oxide (SiO). The insulating layer 5 can be formed by a method such as sputtering or chemical vapor deposition (CVD), etc. The insulating layer 5 can also be formed by using an organic material such as an acrylic resin or a polyimide resin.

[0065] The planar shape of the opening in the insulating layer 5 is not particularly limited, but is preferably approximately similar to the planar shape of the light outcoupling structure 10. For example, if the planar shape of the light outcoupling structure 10 is circular, it is preferable that the planar shape of the opening in the insulating layer 5 is also circular. When the planar shape of the opening in the insulating layer 5 is approximately similar to the planar shape of the light outcoupling structure 10, it becomes possible to make the light-emitting characteristics of the organic light-emitting element symmetric with respect to the azimuth angle of the organic light-emitting element. Since the planar shape of the light outcoupling structure 10 is preferably rotationally symmetric, it is particularly preferable that the planar shape of the opening in the insulating layer 5 is approximately circular.

[0066] The organic light-emitting device 100 according to this embodiment may have a sealing layer 6 formed to cover the organic compound layer 3 and the upper electrode 4. The sealing layer 6 is preferably transparent and contains an inorganic material with extremely low permeability to oxygen and moisture from the outside. Examples of inorganic materials contained in the sealing layer 6 include silicon nitride (SiN), silicon oxynitride (SiON), silicon oxide (SiO), aluminum oxide (Al2O3), and titanium oxide (TiO2). Among these, the sealing layer 6 preferably contains SiN, SiON, or Al2O3 from the viewpoint of enhancing sealing performance. The sealing layer 6 is preferably formed by chemical vapor deposition (CVD), atomic layer deposition (ALD), sputtering, or ion plating. As long as the sealing layer 6 has sufficient moisture-blocking properties, it may have a single-layer structure or a laminated structure combining the above materials and forming techniques. It may also have a laminated structure of an inorganic material and an organic material such as a resin. Furthermore, when a plurality of organic light-emitting elements are formed on the substrate 1, the sealing layer 6 may be disposed continuously between adjacent organic light-emitting elements, spanning over the upper electrodes 4 of the respective organic light-emitting elements. In this case, the upper electrodes 4 may also be disposed continuously between adjacent organic light-emitting elements.

[0067] Furthermore, a planarization layer 7 can also be formed on the sealing layer 6 of the organic light-emitting element 100. The planarization layer 7 is preferably formed by a wet process such as spin coating, dip coating, slit coating, or blade coating. Using a wet process makes it easier to flatten the light-emitting side surface of the planarization layer 7. The planarization layer 7 formed by a wet process is preferably cured by heating or UV irradiation after formation. Furthermore, when multiple organic light-emitting elements are formed on the substrate 1, the planarization layer 7 may be disposed continuously between adjacent organic light-emitting elements, spanning the sealing layers 6 of each of the multiple organic light-emitting elements.

[0068] (Second embodiment) A light emitting device according to a second embodiment of the present invention will be described. Explanations of parts common to the first embodiment will be omitted as appropriate. Figure 8 is a schematic cross-sectional view for explaining optical interference in an organic light emitting element included in the light emitting device according to the second embodiment.

[0069] The light-emitting element included in the light-emitting device of this embodiment differs from that of the first embodiment in that it has a semi-reflective surface between the light-emitting layer 31 and the light-extraction structure 10. More specifically, the light-emitting element included in the light-emitting device of this embodiment has a semi-reflective surface S3 on the organic compound layer 3. In the light-emitting element included in the light-emitting device of this embodiment, the upper electrode 4 may have the semi-reflective surface S3. More specifically, the lower surface of the upper electrode 4 may have the semi-reflective surface S3. Alternatively, a semi-reflective layer 15 may be provided separately from the upper electrode 4, and the semi-reflective layer 15 may have the semi-reflective surface S3.

[0070] In this embodiment, the third light L3 and the second light L2 constructively interfere with each other due to optical interference. The third light L3 is light emitted from the light-emitting layer 31 toward the light-emitting side, reflected by the semi-reflective surface S3, traveling toward the light-reflecting side, and reflected by the reflective surface S2 to travel in the first direction D1. The second light L2 is light emitted from the light-emitting layer 31 toward the light-emitting side and traveling in the first direction D1. The optical distance Lb between the light-emitting layer 31 and the reflective surface S2 and the optical distance Lt between the light-emitting layer 31 and the semi-reflective surface S3 are adjusted so as to satisfy these optical interference conditions.

[0071] More specifically, the optical distance La between the reflecting surface S2 and the semi-reflecting surface S3 is adjusted to satisfy the following formula (6): When the following formula (6) is satisfied, the first light L2 and the third light L3 reinforce each other, and the light traveling in the first direction D1 through the light-emitting layer 31 is strengthened. In addition to adjusting the optical distance La, the phase shift φb at the reflecting surface S2 and the phase shift φt at the semi-reflecting surface S3 may also be adjusted. La / cosθ1×(1+cos(2θ1))=λ1×(l-φb / 360-φt / 360)...Equation (6)

[0072] In formula (6), La represents the optical distance (unit: nm) between the reflective surface S2 and the semi-reflective surface S3, θ1 represents the angle (unit: degrees) between the normal to the main surface S1 of the substrate 1 and the first direction D1, λ1 represents a wavelength (unit: nm) included in the peak wavelength range of the PL spectrum of the first light-emitting material contained in the light-emitting layer 31, φb represents the phase shift (unit: degrees) upon reflection from the reflective surface S2, and φt represents the phase shift (unit: degrees) upon reflection from the semi-reflective surface S3. Furthermore, l is an integer equal to or greater than 0.

[0073] With this configuration, light having a wavelength included in the peak wavelength range of the PL spectrum of the first light-emitting material can be constructively coupled when traveling in a direction inclined relative to the normal direction (the first direction D1 or the second direction D2 within the light-emitting layer 31). This makes it possible to further intensify the light emitted from the light-emitting layer 31. The intensified light then reaches the inclined portion 21 of the light outcoupling structure 10, is refracted, and is emitted in a direction approximately perpendicular to the main surface S1 of the substrate 1, as in the first embodiment. As a result, the intensity of the light emitted in the front direction can be increased.

[0074] In formula (6), the value of l is not particularly limited as long as it is an integer of 0 or more, but from the viewpoint of the wavelength range to be intensified, it is preferably 0 or more and 2 or less, more preferably 0 or 1, and particularly preferably 1. When l=1, the emission intensity is intensified highly on the wide-angle side, and in addition, the angle dependency of the emission wavelength is small, which is favorable.

[0075] Furthermore, similar to the first embodiment, the second light L2 and the first light L1 emitted from the light-emitting layer 31 toward the light-reflecting side, reflected by the reflecting surface S2, and traveling in the first direction D1 may be configured to constructively interfere with each other through optical interference. That is, in addition to the above formula (6), the above formula (1) may also be satisfied. This makes it possible to further strengthen the light with a wavelength included in the peak wavelength range of the PL spectrum of the first light-emitting material traveling in a direction inclined relative to the normal direction (the first direction D1 or the second direction D2 within the light-emitting layer 31). This makes it possible to further increase the intensity of the light emitted in the front direction.

[0076] (Third embodiment) A third embodiment of the present invention will be described. Explanation of parts common to the first embodiment will be omitted where appropriate. Figure 9 is a schematic cross-sectional view of a light emitting device of the third embodiment.

[0077] The light emitting device of this embodiment has a plurality of organic light emitting elements arranged on a substrate 1, and in addition to a first organic light emitting element 100, has a second organic light emitting element 200 and a third organic light emitting element 300. The configuration of the first organic light emitting element 100 is the same as the organic light emitting element 100 described in the first embodiment.

[0078] The second organic light-emitting element 200 and the third organic light-emitting element 300 also have a basic configuration similar to that of the first organic light-emitting element 100. That is, like the first organic light-emitting element 100, the second organic light-emitting element 200 and the third organic light-emitting element 300 have, on a substrate 1, a reflective layer 11, a lower electrode 2, an organic compound layer 3, an upper electrode 4, and a light-extraction structure 10, arranged from the main surface S1 side (main surface side) of the substrate 1. Also, like the first organic light-emitting element 100, the second organic light-emitting element 200 and the third organic light-emitting element 300 have an insulating layer 5 covering the end of each lower electrode 2, a sealing layer 6 disposed on the upper electrode 4, and a planarization layer 7. Here, the light-extraction structures of the first organic light-emitting element 100, the second organic light-emitting element 200, and the third organic light-emitting element 300 are referred to as light-extraction structures 110, 210, and 310, respectively.

[0079] Next, differences between the second organic light-emitting element 200 and the third organic light-emitting element 300 and the first organic light-emitting element 100 will be described. The second organic light-emitting element 200 and the third organic light-emitting element 300 have light-emitting layers that emit light of a different wavelength from that of the first organic light-emitting element 100. The second organic light-emitting element 200 and the third organic light-emitting element 300 have a configuration in which light of a different wavelength from that of the first organic light-emitting element 100 traveling in a direction inclined with respect to the normal direction to the main surface 1 of the substrate 1 reinforces each other through optical interference.

[0080] The organic compound layer 3 of the second organic light-emitting element 200 includes a light-emitting layer 32, which contains a second light-emitting material different from the first light-emitting material. The second light-emitting material exhibits a PL spectrum different from that of the first light-emitting material, and the peak wavelength λ of the PL spectrum of the second light-emitting material is p2 (nm) is the peak wavelength λ of the PL spectrum of the first light-emitting material p1 (nm). The first organic light-emitting element 100 emits light emitted from a first light-emitting material, while the second organic light-emitting element 200 emits light emitted from a second light-emitting material. In other words, the first organic light-emitting element 100 and the second organic light-emitting element 200 emit light of different colors.

[0081] Like the first organic light-emitting element 100, the second organic light-emitting element 200 also has a resonator structure in which emitted light is intensified by optical interference. However, the wavelength of the light that is intensified differs from that of the first organic light-emitting element 100. The wavelength included in the peak wavelength range of the PL spectrum of the second light-emitting material is defined as the second wavelength λ2. In the second organic light-emitting element 200, the optical distance Lb2 between the light-emitting layer 32 and the reflecting surface S2 is adjusted so that the light of the second wavelength λ2 traveling in the first direction D1 and the second direction D2 through the light-emitting layer 32 is intensified. The first direction D1 and the second direction D2 intersect with the normal direction to the main surface S1 of the substrate 1 and can also be considered to be inclined with respect to the normal direction. The first direction D1 and the second direction D2 may be the same as or different from the first direction D1 and the second direction D2 in the first organic light-emitting element 100. That is, the first direction D1 and the second direction D2 in the second organic light emitting element 200 can also be called a fifth direction and a sixth direction, respectively, to distinguish them from the first direction D1 and the second direction D2 in the first organic light emitting element.

[0082] In the second organic light-emitting element 200, similarly to the first organic light-emitting element 100, light traveling in the first direction D1 through the light-emitting layer 32 is refracted upon reaching the inclined portion 21 of the light-extraction structure 210 and emitted in the third direction D3. Furthermore, light traveling in the second direction D2 through the light-emitting layer 32 is refracted upon reaching the inclined portion 21 of the light-extraction structure 210 and emitted in the fourth direction D4. Here, the third direction D3 and the fourth direction D4 are directions substantially perpendicular to the main surface S1 of the substrate 1. The third direction D3 and the fourth direction D4 may be the same as or different from the third direction D3 and the fourth direction D4 in the first organic light-emitting element 100. That is, the third direction D3 and the fourth direction D4 in the second organic light-emitting element 200 may also be referred to as the seventh direction and the eighth direction, respectively, to distinguish them from the third direction D3 and the fourth direction D4 in the first organic light-emitting element. As a result, light having a wavelength included in the peak wavelength range of the PL spectrum of the second light-emitting material is intensified and emitted toward the front of the light-emitting device. The second organic light-emitting element 200 also has a plurality of inclined portions 21, including a first inclined portion 21a and a second inclined portion 21b. With this configuration, the light emission intensity in the front direction is increased, similar to the mechanism in the first organic light-emitting element 100.

[0083] Like the first organic light-emitting element 100, the third organic light-emitting element 300 also has a resonator structure in which emitted light is intensified by optical interference, but the wavelength of light that is intensified is different from that of the first organic light-emitting element 100. In the third organic light-emitting element 300, when the third wavelength λ3 is defined as a wavelength included in the peak wavelength range of the PL spectrum of the third light-emitting material, the optical distance Lb3 between the light-emitting layer 33 and the reflective surface S2 is adjusted so that light of the third wavelength λ3 traveling in the first direction D1 and the second direction D2 through the light-emitting layer 33 is intensified. Here, the first direction D1 and the second direction D2 are directions that form an angle with the normal direction to the main surface S1 of the substrate 1 of greater than 0 degrees and are inclined with respect to the normal direction. The first direction D1 and the second direction D2 may be the same as or different from the first direction D1 in the first organic light-emitting element 100. The first direction D1 and the second direction D2 in the third organic light emitting element 200 can also be called the ninth direction and the tenth direction, respectively, to distinguish them from the first direction D1 and the second direction D2 in the first organic light emitting element.

[0084] In the third organic light-emitting element 300, similarly to the first organic light-emitting element 100, light traveling in the first direction D1 through the light-emitting layer 33 is refracted upon reaching the inclined portion 21 of the light-extraction structure 310 and emitted in the third direction D3. Furthermore, light traveling in the second direction D2 through the light-emitting layer 33 is refracted upon reaching the inclined portion 21 of the light-extraction structure 310 and emitted in the fourth direction D4. Here, the third direction D3 is a direction substantially perpendicular to the main surface S1 of the substrate 1. The third direction D3 and the fourth direction D4 may be the same as or different from the third direction D3 and the fourth direction D4 in the first organic light-emitting element 100. That is, the third direction D3 and the fourth direction D4 in the third organic light-emitting element 300 may also be referred to as the eleventh direction and the twelfth direction, respectively, to distinguish them from the third direction D3 and the fourth direction D4 in the first organic light-emitting element. As a result, light having a wavelength included in the peak wavelength range of the PL spectrum of the third light-emitting material is intensified and emitted toward the front of the light-emitting device. The third organic light-emitting element 300 also has multiple inclined portions 21, including a first inclined portion 21a and a second inclined portion 21b. With this configuration, similar to the mechanism in the first organic light-emitting element 100, the light emission intensity in the front direction is increased.

[0085] Here, the angle formed between the first direction D1 in which the light of the first wavelength λ1 (unit: nm) is intensified in the first organic light-emitting element 100 and the normal direction of the main surface S1 of the substrate 1 is defined as θ 11 (unit: degree), and the optical distance between the reflecting surface S2 and the light-emitting layer 31 is Lb1 (unit: nm). In addition, the angle formed between the first direction D1 in which the light of the second wavelength λ2 (unit: nm) is intensified in the second organic light-emitting element 200 and the normal direction of the main surface S1 of the substrate 1 is θ 12 (unit: degree), and the optical distance between the reflecting surface S2 and the light-emitting layer 32 is Lb2 (unit: nm). In addition, the angle formed between the first direction D1 in which the light of the third wavelength λ3 (unit: nm) is intensified in the third organic light-emitting element 300 and the normal direction of the main surface S1 of the substrate 1 is θ 13(unit: degree), and the optical distance between the reflecting surface S2 and the light emitting layer 33 is Lb3 (unit: nm). In this case, the following equations (7) to (9) hold, similar to the above equation (1). Lb1 / cosθ 11 ×(1+sin(90-2θ 11 ))=λ1×(m1-φb / 360)...Equation (7) Lb2 / cosθ 12 ×(1+sin(90-2θ 12 ))=λ2×(m2-φb / 360)...Equation (8) Lb3 / cosθ 13 ×(1+sin(90-2θ 13 ))=λ3×(m3-φb / 360)...Equation (9)

[0086] Here, in the formulas (7) to (9), m1 to m3 are integers equal to or greater than 0. Furthermore, θ 11 =θ 12 =θ 13 =θ1, the above formulas (7) to (9) can be transformed into the following formulas (7)′ to (9)′, where m is an integer of 0 or more. Lb1 / cosθ1×(1+sin(90-2θ1))=λ1×(m1-φb / 360)...Equation (7)′ Lb2 / cosθ1×(1+sin(90-2θ1))=λ2×(m2-φb / 360)...Equation (8)′ Lb3 / cosθ1×(1+sin(90-2θ1))=λ3×(m3-φb / 360)...Equation (9)′

[0087] As described above, the first wavelength λ1, the second wavelength λ2, and the third wavelength λ3 may be different from one another. For example, by setting the first wavelength λ1 to a wavelength in the red wavelength region, the second wavelength λ2 to a wavelength in the green wavelength region, and the third wavelength λ3 to a wavelength in the blue wavelength region, the light emitting device can be a display device capable of full-color display.

[0088] The optical distances Lb1, Lb2, and Lb3 may be different from one another. The optical distances Lb1 to Lb3 can be made different from one another by varying at least one of the film thickness and refractive index of the organic compound layer 3, the lower electrode 2, and the optical interference layer 12 provided between the reflective surface S2 and the light-emitting layers 31 to 33 of each organic light-emitting element.

[0089] The inclination angles of the inclined portions 21 of the light extraction structures 10 of the first organic light-emitting element 100, the second organic light-emitting element 200, and the third organic light-emitting element 300 may be the same or different. From the viewpoint of simplifying the manufacturing method, it is preferable that the inclination angles of the inclined portions 21 of the light extraction structures 10 of the first organic light-emitting element 100, the second organic light-emitting element 200, and the third organic light-emitting element 300 are the same. Furthermore, it is more preferable that the light extraction structures 10 of the first organic light-emitting element 100, the second organic light-emitting element 200, and the third organic light-emitting element 300 have the same shape.

[0090] Each of the plurality of organic light-emitting elements, such as the first organic light-emitting element 100, the second organic light-emitting element 200, and the third organic light-emitting element 300, arranged on the substrate 1 can be regarded as a subpixel. A light-emitting device having a plurality of main pixels arranged on the substrate 1 may be configured as a main pixel, with the plurality of subpixels constituting the main pixel. This allows the light-emitting device to be a display device capable of high-resolution display. For example, each of the plurality of main pixels may have a first subpixel having the first organic light-emitting element 100, a second subpixel having the second organic light-emitting element 200, and a third subpixel having the third organic light-emitting element 300. The pixel arrangement of the subpixels and main pixels can be any pixel arrangement, such as a stripe arrangement, a delta arrangement, a Bayer arrangement, or a Pentile arrangement. Among these, the delta arrangement is preferred because it facilitates the arrangement of circular lenses within the display plane.

[0091] (Fourth embodiment) A fourth embodiment of the present invention will be described. Explanation of parts common to the third embodiment will be omitted where appropriate. Fig. 10 is a schematic cross-sectional view of a light emitting device of the fourth embodiment.

[0092] The light emitting device of this embodiment has a plurality of organic light emitting elements, namely, a first organic light emitting element 100, a second organic light emitting element 200, and a third organic light emitting element 300, as in the third embodiment.

[0093] In the light-emitting device of the third embodiment, a light-emitting layer containing a different light-emitting material is provided for each organic light-emitting element. That is, the first organic light-emitting element 100 is provided with a light-emitting layer 31, the second organic light-emitting element 200 is provided with a light-emitting layer 32, and the third organic light-emitting element 300 is provided with a light-emitting layer 33. In contrast, in the light-emitting device of the present embodiment, each organic light-emitting element has all of the light-emitting layers 31 to 33. That is, the first organic light-emitting element 100, the second organic light-emitting element 200, and the third organic light-emitting element 300 are each provided with the light-emitting layers 31 to 33. The light-emitting layer 31 contains a first light-emitting material, the light-emitting layer 32 contains a second light-emitting material, and the light-emitting layer 33 contains a third light-emitting material.

[0094] Therefore, in the light-emitting device of this embodiment, the organic compound layer 3 of each organic light-emitting element emits a mixture of light emitted from the first light-emitting material, light emitted from the second light-emitting material, and light emitted from the third light-emitting material. For example, if the first light-emitting material is a red light-emitting material, the second light-emitting material is a green light-emitting material, and the third light-emitting material is a blue light-emitting material, the organic compound layer 3 of each organic light-emitting element emits white light.

[0095] The light-emitting layers 31 to 33 may be formed independently for each of the first organic light-emitting element 100, the second organic light-emitting element 200, and the third organic light-emitting element 300, or may be formed in common across multiple organic light-emitting elements. FIG. 10 shows an example in which the light-emitting layers 31 to 33 are formed in common across the first organic light-emitting element 100, the second organic light-emitting element 200, and the third organic light-emitting element 300. In cases where the size of each organic light-emitting element is small in plan view relative to the substrate 1, such as in ultra-high definition displays, it may be difficult to form the light-emitting layers 31 to 33 independently for each organic light-emitting element. In such cases, forming the light-emitting layers 31 to 33 in common across multiple organic light-emitting elements can facilitate manufacturing.

[0096] In this embodiment, three types of light-emitting layers, 31 to 33, are formed, but the present invention is not limited to this. Instead of forming three types of light-emitting layers, one light-emitting layer may contain a first light-emitting material, a second light-emitting material, and a third light-emitting material. Alternatively, two types of light-emitting layers may be formed, with one light-emitting layer containing the first light-emitting material and the other light-emitting layer containing the second light-emitting material and the second light-emitting material, for example, a light-emitting layer containing one type of light-emitting material may be combined with a light-emitting layer containing two types of light-emitting materials. The combination may be arbitrary depending on the type of light-emitting material.

[0097] The light-emitting device of this embodiment has a color filter layer 13 on the upper electrode 4. The color filter layer 13 has a first color filter 131, a second color filter 132, and a third color filter 133. The first color filter 131, the second color filter 132, and the third color filter 133 may transmit light in different wavelength ranges. In this embodiment, the color filter layer 13 is disposed between the upper electrode 4 and the light extraction structure 10, but the color filter layer 13 may also be disposed on the light extraction structure 10. The first color filter 131 is disposed between the upper electrode 4 and the light extraction structure 10 of the first organic light-emitting element 100. The second color filter 132 is disposed between the upper electrode 4 and the light extraction structure 10 of the second organic light-emitting element 200. The third color filter 133 is disposed between the upper electrode 4 and the light extraction structure 10 of the third organic light-emitting element 300. In this embodiment, the color filter layer 13 is disposed on the planarization layer 7, and the planarization layer 8 is also disposed on the color filter layer 13. This is preferable because it allows the color filter layer 13 and the light extraction structure 10 to be formed on a flat surface.

[0098] The first color filter 131, the second color filter 132, and the third color filter 133 can be formed by applying a color resist onto a base such as the planarization layer 7, and then patterning it by lithography. The color resist is made of, for example, a photocurable resin, and forms a pattern by curing the portions irradiated with ultraviolet light or the like.

[0099] Here, the first color filter layer 131 transmits light in a wavelength range including a first wavelength λ1, the second color filter layer 132 transmits light in a wavelength range including a second wavelength λ2, and the third color filter layer 133 transmits light in a wavelength range including a third wavelength λ3. The first wavelength λ1 is a wavelength included in the peak wavelength range of the PL spectrum of the first light-emitting material contained in the light-emitting layer 31. The second wavelength λ2 is a wavelength included in the peak wavelength range of the PL spectrum of the second light-emitting material contained in the light-emitting layer 32. The third wavelength λ3 is a wavelength included in the peak wavelength range of the PL spectrum of the third light-emitting material contained in the light-emitting layer 33. In other words, the color filter layer 13 extracts light of the first wavelength λ1 from the first organic light-emitting element 100, light of the second wavelength λ2 from the second organic light-emitting element 200, and light of the third wavelength λ3 from the third organic light-emitting element 300. Note that the first color filter 131 does not necessarily transmit light of the second wavelength λ2 and the third wavelength λ3. Furthermore, the second color filter 132 does not have to transmit light of the third wavelength λ3 and the first wavelength λ1, and the third color filter 133 does not have to transmit light of the first wavelength λ1 and the second wavelength λ2.

[0100] In this embodiment, light having wavelengths included in the wavelength range of light extracted from each organic light-emitting element through the color filter layer 13 constructively interferes with one another when traveling in a direction inclined relative to the normal to the main surface S1 of the substrate 1 within the light-emitting layer. Specifically, in the first organic light-emitting element 100, the optical distance Lb1 between the light-emitting layer 31 and the reflecting surface S2 is adjusted so that light having a first wavelength λ1 traveling in the first direction D1 through the light-emitting layer 31 is intensified. In the second organic light-emitting element 200, the optical distance Lb2 between the light-emitting layer 32 and the reflecting surface S2 is adjusted so that light having a second wavelength λ2 traveling in the first direction D1 through the light-emitting layer 32 is intensified. In the third organic light-emitting element 300, the optical distance Lb3 between the light-emitting layer 33 and the reflecting surface S2 is adjusted so that light having a third wavelength λ3 traveling in the first direction D1 through the light-emitting layer 33 is intensified. More specifically, the optical distances Lb1 to Lb3 are adjusted so that the above formulas (7) to (9) or the above formulas (7)' to (9)' hold. When the first wavelength λ1, the second wavelength λ2, and the third wavelength λ3 are different from one another, the optical distances Lb1 to Lb3 may also be different from one another.

[0101] The optical distances Lb1 to Lb3 can be adjusted by adjusting at least one of the film thickness and refractive index of the organic compound layer 3, the lower electrode 2, and the optical interference layer 12, which are provided between the reflective surface S2 and the light-emitting layers 31 to 33 of each organic light-emitting element. From the viewpoint of ease of manufacturing, it is preferable to adjust the optical distances Lb1 to Lb3 by adjusting the thickness of the optical interference layer 12. In this embodiment, the first organic light-emitting element 100 has a first optical interference layer 121, the second organic light-emitting element 200 has a second optical interference layer 122, and the third organic light-emitting element 300 has a third optical interference layer 123. The first optical interference layer 121, the second optical interference layer 122, and the third optical interference layer 123 have different thicknesses, which results in different optical distances Lb1 to Lb3. Therefore, the wavelength of light that is intensified when traveling in the first direction D1 differs for each organic light-emitting element, as described above.

[0102] As in other embodiments, the light that travels in the first direction D1 in each organic light-emitting element and is intensified is emitted in a direction approximately perpendicular to the main surface S1 of the substrate 1 at the inclined portion 21 of the light extraction structure 10.

[0103] This embodiment is particularly useful in cases where it is difficult to form organic compound layers separately for the first organic light emitting element 100, the second organic light emitting element 200, and the third organic light emitting element 300, such as in ultra-high definition displays.

[0104] In the light-emitting layer, if light traveling in a direction inclined with respect to the normal direction of the main surface S1 of the substrate 1 is intensified, the light may penetrate into adjacent organic light-emitting elements, resulting in color mixing. However, in this embodiment, since the color filter layer 13 is provided, the light that penetrates into adjacent organic light-emitting elements is absorbed by the color filter layer 13 provided thereon, and is prevented from being emitted to the outside. For example, when light penetrates from the first organic light-emitting element 100 to the second organic light-emitting element 200, the light of the first wavelength λ1 is absorbed by the second color filter 132 provided on the second organic light-emitting element 200 and is not emitted to the outside. This prevents color mixing.

[0105] (Fifth embodiment) A fifth embodiment of the present invention will be described below, and explanations of parts common to the third and fourth embodiments will be omitted as appropriate.

[0106] The light-emitting device of this embodiment, like the third and fourth embodiments, has multiple organic light-emitting elements, including a first organic light-emitting element 100, a second organic light-emitting element 200, and a third organic light-emitting element 300. In this embodiment, like the third embodiment, each organic light-emitting element may be provided with a light-emitting layer containing a different light-emitting material. That is, the first organic light-emitting element 100 may be provided with a light-emitting layer 31, the second organic light-emitting element 200 may be provided with a light-emitting layer 32, and the third organic light-emitting element 300 may be provided with a light-emitting layer 33. Furthermore, in the light-emitting device of this embodiment, like the fourth embodiment, each organic light-emitting element may have all of the light-emitting layers 31 to 33.

[0107] In this embodiment, the light-emitting layer 31 contains a first light-emitting material, the light-emitting layer 32 contains a second light-emitting material, and the light-emitting layer 33 contains a third light-emitting material. Of the peak wavelengths of the PL spectra of the first light-emitting material, the second light-emitting material, and the third light-emitting material, at least the peak wavelength of the PL spectrum of the first light-emitting material is different from the peak wavelength of the PL spectrum of the second light-emitting material.

[0108] In addition, among the full width at half maximum FWHM1 of the PL spectrum of the first light-emitting material, the full width at half maximum FWHM2 of the PL spectrum of the second light-emitting material, and the full width at half maximum FWHM3 of the PL spectrum of the third light-emitting material, at least the full width at half maximum FWHM2 of the PL spectrum of the second light-emitting material is larger than the full width at half maximum FWHM1 of the PL spectrum of the first light-emitting material.

[0109] The first organic light-emitting element 100, the second organic light-emitting element 200, and the third organic light-emitting element 300 each have a resonator structure that intensifies emitted light by optical interference. Specifically, in the first organic light-emitting element 100, the resonator structure is formed so that the peak wavelength range of the PL spectrum of the first light-emitting material is intensified in the first and second directions. In the second organic light-emitting element 200, the resonator structure is formed so that the peak wavelength range of the PL spectrum of the second light-emitting material is intensified in the fifth and sixth directions. In the third organic light-emitting element 300, the resonator structure is formed so that the peak wavelength range of the PL spectrum of the third light-emitting material is intensified in the ninth and tenth directions.

[0110] In this embodiment, among the first organic light-emitting element 100, the second organic light-emitting element 200, and the third organic light-emitting element 300, the fifth and sixth directions in the second organic light-emitting element 200 are smaller than the first and second directions in the first organic light-emitting element 100.

[0111] When the direction in which the peak wavelength range of the PL spectrum due to the resonator structure increases becomes smaller relative to the normal direction of the main surface S1, the full width at half maximum of the emission spectrum decreases. On the other hand, when the direction in which the peak wavelength range of the PL spectrum increases relative to the normal direction of the main surface S1, the full width at half maximum of the emission spectrum increases.

[0112] In this embodiment, the second organic light-emitting element 200 includes a second light-emitting material having a PL spectrum full width at half maximum greater than that of the first light-emitting material. Meanwhile, the second organic light-emitting element 200 has a PL spectrum whose peak wavelength range due to the resonator structure is intensified less in the direction normal to the main surface S1 than the first organic light-emitting element. Therefore, in this embodiment, it is possible to control the full width at half maximum of the emission spectrum of the second organic light-emitting element so that it does not become too large. Since it is possible to control the full width at half maximum of the emission spectrum of the second organic light-emitting element so that it does not become too large, the structure of this embodiment has the advantage of facilitating color separation between the emission spectrum of the first organic light-emitting element and the emission spectrum of the second organic light-emitting element. One benefit of facilitating color separation is that it facilitates correction of lateral chromatic aberration. Correction of lateral chromatic aberration is a technique for correcting lateral chromatic aberration, which occurs when light emitted from a light-emitting device passes through an optical system such as a lens, by adjusting the light emission amount of the light-emitting element in the light-emitting device.

[0113] In particular, it is preferable that the second light-emitting material of the second organic light-emitting element 200 is a phosphorescent material. This is because, when comparing the PL spectrum shape of phosphorescent materials with that of fluorescent materials, the full width at half maximum of the PL spectrum tends to be larger. Furthermore, it is preferable that the first light-emitting material of the first organic light-emitting element 100 is a fluorescent material.

[0114] Furthermore, the light extraction structure 110 of the first organic light-emitting element and the light extraction structure 210 of the second organic light-emitting element may have the same shape or different shapes as long as they satisfy the requirements described in the first embodiment.

[0115] (Sixth embodiment) A sixth embodiment of the present invention will be described below, and explanations of parts common to the third and fourth embodiments will be omitted as appropriate.

[0116] In this embodiment, a first organic light emitting element 100, a second organic light emitting element 200, and a third organic light emitting element 300 are provided.

[0117] In this embodiment, the light-emitting layer 31 contains a first light-emitting material, the light-emitting layer 32 contains a second light-emitting material, and the light-emitting layer 33 contains a third light-emitting material. Of the peak wavelengths of the PL spectra of the first light-emitting material, the peak wavelengths of the PL spectra of the second light-emitting material, and the peak wavelengths of the PL spectra of the third light-emitting material, at least the peak wavelength λ of the PL spectrum of the first light-emitting material is different from the peak wavelength λ of the PL spectrum of the second light-emitting material.

[0118] The first organic light-emitting element 100, the second organic light-emitting element 200, and the third organic light-emitting element 300 each have a resonator structure that intensifies emitted light by optical interference. Specifically, in the first organic light-emitting element 100, the resonator structure is formed so that a first wavelength in the peak wavelength range of the PL spectrum of the first light-emitting material is intensified in a first direction and a second direction. In the second organic light-emitting element 200, the resonator structure is formed so that a second wavelength in the peak wavelength range of the PL spectrum of the second light-emitting material is intensified in a fifth direction and a sixth direction. In the third organic light-emitting element 300, the resonator structure is formed so that a third wavelength in the peak wavelength range of the PL spectrum of the third light-emitting material is intensified in a ninth direction and a tenth direction.

[0119] In this embodiment, the first organic light-emitting element satisfies the following formula (10). Lb1 / cosθ1×(1+sin(90-2θ1))=λ1×(m1-φb1 / 360)...Equation (10)

[0120] In formula (10), Lb1 represents the optical distance (unit: nm) between the light-emitting layer 31 and the reflecting surface S2, θ1 represents the angle (unit: degrees) between the normal direction to the main surface S1 of the substrate 1 and the first direction, λ1 represents a wavelength (unit: nm) included in the peak wavelength range of the PL spectrum of the first light-emitting material contained in the light-emitting layer 31, and φb1 represents the phase shift (unit: degrees) upon reflection on the reflecting surface S2. Furthermore, m1 is an integer equal to or greater than 0.

[0121] Furthermore, the second organic light-emitting element satisfies the following formula (11). Lb2 / cosθ2×(1+sin(90-2θ2))=λ2×(m2-φb2 / 360)...Equation (11)

[0122] In formula (11), Lb2 represents the optical distance (unit: nm) between the light-emitting layer 32 and the reflecting surface S2, θ2 represents the angle (unit: degrees) between the normal direction to the main surface S1 of the substrate 1 and the fifth direction, λ2 represents a wavelength (unit: nm) included in the peak wavelength range of the PL spectrum of the second light-emitting material contained in the light-emitting layer 32, and φb2 represents the phase shift (unit: degrees) upon reflection at the reflecting surface S2. Furthermore, m2 is an integer equal to or greater than 0.

[0123] In this embodiment, the m2 of the second organic light-emitting element is smaller than the m1 of the first organic light-emitting element, while the fifth and sixth directions of the second organic light-emitting element 200 are smaller than the first and second directions of the first organic light-emitting element 100.

[0124] As the values ​​of m1 and m2 become smaller, the wavelength region that is intensified by the resonator structure becomes larger, and the full width at half maximum of the emission spectrum becomes larger.

[0125] In this embodiment, m2 of the second organic light-emitting element is smaller than m1 of the first organic light-emitting element, and the fifth and sixth directions in the second organic light-emitting element 200 are smaller than the first and second directions in the first organic light-emitting element 100. This makes it possible to control the full width at half maximum of the emission spectrum of the second organic light-emitting element so that it does not become too large. Therefore, the structure of this embodiment has the advantage of easily achieving color separation between the emission spectrum of the first organic light-emitting element and the emission spectrum of the second organic light-emitting element.

[0126] In this embodiment, it is particularly preferable that the value of m2 of the second organic light-emitting element is 0, and the value of m1 of the first organic light-emitting element is 1.

[0127] (Seventh embodiment) A seventh embodiment of the present invention will be described below, and explanations of parts common to the third and fourth embodiments will be omitted as appropriate.

[0128] In this embodiment, a first organic light emitting element 100, a second organic light emitting element 200, and a third organic light emitting element 300 are provided.

[0129] In this embodiment, the light-emitting layer 31 contains a first light-emitting material, the light-emitting layer 32 contains a second light-emitting material, and the light-emitting layer 33 contains a third light-emitting material. The peak wavelengths of the PL spectra of the first light-emitting material, the second light-emitting material, and the third light-emitting material are all different from each other.

[0130] Furthermore, the first organic light-emitting element 100, the second organic light-emitting element 200, and the third organic light-emitting element 300 each have a resonator structure that intensifies emitted light by optical interference. Specifically, in the first organic light-emitting element 100, the resonator structure is formed so that a first wavelength in the peak wavelength range of the PL spectrum of the first light-emitting material is intensified in a first direction and a second direction. In the second organic light-emitting element 200, the resonator structure is formed so that a second wavelength in the peak wavelength range of the PL spectrum of the second light-emitting material is intensified in a fifth direction and a sixth direction. In the third organic light-emitting element 300, the resonator structure is formed so that a third wavelength in the peak wavelength range of the PL spectrum of the third light-emitting material is intensified in a ninth direction and a tenth direction.

[0131] In this embodiment, the peak wavelength of the PL spectrum of the second light-emitting material is intermediate between the peak wavelength of the PL spectrum of the first light-emitting material and the peak wavelength of the PL spectrum of the third light-emitting material.

[0132] On the other hand, the fifth and sixth directions of the second organic light emitting element 200 are smaller than the first and second directions of the first organic light emitting element 100 and the ninth and tenth directions of the third organic light emitting element 300.

[0133] With this configuration, the full width at half maximum of the emission spectrum of the second organic light-emitting element 200 is not too large. Since the emission spectrum of the second organic light-emitting element 200 has an intermediate color between the emission spectrum of the first organic light-emitting element 100 and the emission spectrum of the third organic light-emitting element 300, the emission spectrum of the first organic light-emitting element 100 can be easily color-separated from the emission spectrum of the first organic light-emitting element 100 and the emission spectrum of the third organic light-emitting element 300.

[0134] In particular, it is preferable that the second organic light-emitting element 200 emits green light. Furthermore, it is preferable that the first organic light-emitting element 100 emits blue or red light, and the third organic light-emitting element 100 emits red or blue light. Since green has a wavelength intermediate between red and blue, it is easy to separate the red, green, and blue colors.

[0135] (Other embodiments) 10 is a schematic diagram illustrating an example of a display device 1000 according to this embodiment. The display device 1000 may include a touch panel 1003, a display panel 1005, a frame 1006, a circuit board 1007, and a battery 1008 between an upper cover 1001 and a lower cover 1009. The display panel 1005 may be, for example, any of the light-emitting devices according to the first to fourth embodiments.

[0136] A flexible printed circuit FPC 1002 and a flexible printed circuit FPC 1004 are connected to the touch panel 1003 and the display panel 1005, respectively. Transistors are printed on the circuit board 1007. The battery 1008 may not be provided if the display device is not a portable device, or may be provided in a different position even if the display device is a portable device.

[0137] The display device 1000 according to this embodiment may be used as a display unit of a photoelectric conversion device having an optical unit with a plurality of lenses and an image sensor that receives light that has passed through the optical unit. The photoelectric conversion device may have a display unit that displays information acquired by the image sensor. Alternatively, information may be acquired using information acquired by the image sensor, and the display unit may display information different from the acquired information. The display unit may be a display unit exposed to the outside of the photoelectric conversion device or a display unit disposed within a viewfinder. The photoelectric conversion device may be a digital camera or a digital video camera.

[0138] FIG. 11(a) is a schematic diagram illustrating an example of a photoelectric conversion device according to this embodiment. The photoelectric conversion device 1100 may include a viewfinder 1101, a rear display 1102, an operation unit 1103, and a housing 1104. The viewfinder 1101 may include any of the light-emitting devices according to the first to fourth embodiments. Alternatively, the viewfinder 1101 may be the display device 1000 described in this embodiment. In this case, the display device may display not only an image to be captured, but also environmental information, imaging instructions, and the like. The environmental information may include the intensity of external light, the direction of external light, the speed at which the subject is moving, the possibility that the subject will be blocked by an obstruction, and the like.

[0139] The photoelectric conversion device 1100 has an optical section (not shown). The optical section has multiple lenses, which form an image on an image sensor housed in a housing 1104. The focus of the multiple lenses can be adjusted by adjusting their relative positions. This operation can also be performed automatically.

[0140] The display device according to the present embodiment may be used as a display unit of a mobile terminal. In this case, the display device may have both a display function and an operation function. Examples of the mobile terminal include a mobile phone such as a smartphone, a tablet, and a head-mounted display.

[0141] FIG. 11(b) is a schematic diagram illustrating an example of an electronic device according to this embodiment. The electronic device 1200 has a display unit 1201, an operation unit 1202, and a housing 1203. The display unit 1201 may have any of the light-emitting devices according to the first to fourth embodiments. The housing 1203 may have a circuit, a printed circuit board having the circuit, a battery, and a communication unit. The operation unit 1202 may be a button or a touch panel type reaction unit. The operation unit may be a biometric recognition unit that recognizes a fingerprint to perform operations such as unlocking. An electronic device having a communication unit can also be called a communication device.

[0142] 12(a) and 12(b) are schematic diagrams showing an example of a display device according to this embodiment. FIG. 12(a) shows a display device such as a television monitor or a PC monitor. The display device 1300 has a frame 1301 and a display unit 1302. The display unit 1302 may have any of the light-emitting devices according to the first to fourth embodiments.

[0143] It has a frame 1301 and a base 1303 that supports a display unit 1302. The base 1303 is not limited to the form shown in Fig. 12(a). The bottom side of the frame 1301 may also serve as the base.

[0144] The frame 1301 and the display unit 1302 may be curved. The radius of curvature may be 5000 mm or more and 6000 mm or less.

[0145] Fig. 12(b) is a schematic diagram showing another example of a display device according to the present embodiment. A display device 1310 in Fig. 12(b) is configured to be bendable, and is a so-called foldable display device. The display device 1310 has a first display unit 1311, a second display unit 1312, a housing 1313, and a bending point 1314. The first display unit 1311 and the second display unit 1312 may have any of the light-emitting devices according to the first to fourth embodiments.

[0146] The first display unit 1311 and the second display unit 1312 may be a single seamless display device. The first display unit 1311 and the second display unit 1312 can be separated at a bending point. The first display unit 1311 and the second display unit 1312 may each display different images, or the first and second display units may display a single image.

[0147] FIG. 13(a) is a schematic diagram illustrating an example of an illumination device according to this embodiment. The illumination device 1400 may include a housing 1401, a light source 1402, a circuit board 1403, an optical film 1404, and a light diffusion unit 1405. The light source 1402 may include any of the light-emitting devices according to the first to fourth embodiments. The optical filter may be a filter that improves the color rendering of the light source 1402. The light diffusion unit can effectively diffuse light from the light source, such as for illumination, and deliver the light over a wide area. The optical filter and the light diffusion unit may be provided on the light emission side of the illumination device. If necessary, a cover may be provided on the outermost part.

[0148] The lighting device is, for example, a device that illuminates a room. The lighting device may emit white, daylight white, or any other color from blue to red. It may have a dimming circuit that dims these colors. The lighting device may have any of the light-emitting devices according to the first to fourth embodiments and a power supply circuit connected thereto. The power supply circuit is a circuit that converts AC voltage into DC voltage. Furthermore, white has a color temperature of 4200K, and daylight white has a color temperature of 5000K. The lighting device may have a color filter.

[0149] The lighting device according to this embodiment may also include a heat dissipation unit, which dissipates heat from within the device to the outside, and may be made of a material such as a metal with a high specific heat capacity or liquid silicon.

[0150] 13(b) is a schematic diagram of an automobile, which is an example of a moving body according to this embodiment. The automobile has tail lamps, which are an example of lighting fixtures. The automobile 1500 has tail lamps 1501, and may be configured to turn on the tail lamps when braking or the like is performed.

[0151] The tail lamp 1501 may include any of the light emitting devices according to the first to fourth embodiments. The tail lamp may include a protective member for protecting the light emitting element. The protective member may be made of any material as long as it has a certain degree of strength and is transparent, but it is preferable that the protective member be made of polycarbonate or the like. Polycarbonate may be mixed with a furandicarboxylic acid derivative, an acrylonitrile derivative, or the like.

[0152] An automobile 1500 may have a body 1503 and a window 1502 attached thereto. The window may be a transparent display as long as it is not a window for checking the front and rear of the automobile. The transparent display may have any of the light-emitting devices according to the first to fourth embodiments. In this case, the constituent materials of the electrodes and the like of the light-emitting device are made of transparent materials.

[0153] The moving body according to the present embodiment may be a ship, an aircraft, a drone, or the like. The moving body may have a body and a lighting device provided on the body. The lighting device may emit light to indicate the position of the body. The lighting device may have any of the light-emitting devices according to the first to fourth embodiments.

[0154] An application example of the display device of each of the above-described embodiments will be described with reference to Fig. 14. The display device can be applied to a system that can be attached as a wearable device, such as smart glasses, an HMD, or a smart contact lens. An image capturing and displaying device used in such an application example includes an image capturing device capable of photoelectrically converting visible light and a displaying device capable of emitting visible light.

[0155] 14(a) illustrates glasses 1600 (smart glasses) according to one application example. An imaging device 1602 such as a CMOS sensor or a SPAD is provided on the front side of a lens 1601 of the glasses 1600. A display device is provided on the back side of the lens 1601, and the display device may include any of the light-emitting devices according to the first to fourth embodiments.

[0156] The glasses 1600 further include a control device 1603. The control device 1603 functions as a power source that supplies power to the image capture device 1602 and the display device according to each embodiment. The control device 1603 also controls the operations of the image capture device 1602 and the display device. The lens 1601 is formed with an optical system for focusing light onto the image capture device 1602.

[0157] FIG. 14(b) illustrates glasses 1610 (smart glasses) according to one application example. The glasses 1610 include a control device 1612, which is equipped with an imaging device corresponding to the imaging device 1602 and a display device. The display device may include any of the light-emitting devices according to the first to fourth embodiments. The lens 1611 includes an imaging device in the control device 1612 and an optical system for projecting light emitted from the display device, and an image is projected onto the lens 1611. The control device 1612 functions as a power source for supplying power to the imaging device and the display device, and controls the operation of the imaging device and the display device. The control device may include a gaze detection unit that detects the gaze of the wearer. Infrared light may be used to detect the gaze. The infrared light emitter emits infrared light toward the eyeball of a user gazing at a displayed image. An imaging unit having a light-receiving element detects the emitted infrared light reflected from the eyeball, thereby obtaining an image of the eyeball. By providing a reduction means for reducing the amount of light from the infrared light emitting section to the display section in a plan view, degradation of image quality is reduced.

[0158] The gaze of the user relative to the displayed image is detected from an image of the eyeball obtained by capturing infrared light. Any known method can be used for gaze detection using an image of the eyeball. One example is a gaze detection method based on the Purkinje image formed by reflection of irradiated light on the cornea.

[0159] More specifically, gaze detection processing is performed based on the pupil-corneal reflex method, which calculates a gaze vector representing the direction (rotation angle) of the eyeball based on the pupil image and Purkinje image included in the captured image of the eyeball, thereby detecting the user's gaze.

[0160] A display device according to an embodiment of the present invention may have an imaging device having a light receiving element, and may control the image displayed on the display device based on information about the user's line of sight from the imaging device.

[0161] Specifically, the display device determines a first field of view area where the user gazes and a second field of view area other than the first field of view area based on the line-of-sight information. The first field of view area and the second field of view area may be determined by a control device of the display device, or may be determined by an external control device and received. In the display area of ​​the display device, the display resolution of the first field of view area may be controlled to be higher than the display resolution of the second field of view area. In other words, the resolution of the second field of view area may be lower than that of the first field of view area.

[0162] The display area includes a first display area and a second display area different from the first display area, and a high-priority area is determined from the first display area and the second display area based on line-of-sight information. The first field of view area and the second field of view area may be determined by a control device of the display device, or may be determined by an external control device and received. The resolution of the high-priority area may be controlled to be higher than the resolution of areas other than the high-priority area. In other words, the resolution of an area with a relatively low priority may be lowered.

[0163] Note that AI may be used to determine the first field of view area and areas with high priority. The AI ​​may be a model configured to estimate the angle of gaze and the distance to an object in the line of sight from an image of the eyeball, using as training data an image of the eyeball and the direction in which the eyeball in the image was actually looking. The AI ​​program may be included in the display device, the imaging device, or an external device. If included in an external device, it is transmitted to the display device via communication.

[0164] When display control is performed based on visual recognition detection, the smart glasses can be preferably applied to smart glasses that further include an imaging device for capturing images of the outside world. The smart glasses can display captured external information in real time.

[0165] (Example) Examples of the present invention will be described below.

[0166] Example 1 The light emitting device of Example 1 having the first organic light emitting element 100, the second organic light emitting element 200, and the third organic light emitting element shown in FIG. 10 was fabricated as follows.

[0167] First, a layer made of Al was formed on the substrate 1 by sputtering, and then patterned by etching to form the reflective layers 11 corresponding to the respective organic light-emitting elements.

[0168] Next, an optical interference layer 121 was formed on the reflective layer 11 of the first organic light-emitting element 100, an optical interference layer 122 was formed on the reflective layer 11 of the second organic light-emitting element 200, and an optical interference layer 123 was formed on the reflective layer 11 of the third organic light-emitting element 300. The optical interference layers 121 to 123 were formed by forming a layer made of SiO by a CVD method and then patterning it by etching. The thickness of the optical interference layer 121 was 213 nm, the thickness of the optical interference layer 122 was 186 nm, and the thickness of the optical interference layer 123 was 164 nm.

[0169] Next, a layer made of ITO was formed to a thickness of 20 nm by sputtering, and then etched to form the lower electrodes 2 of the first organic light-emitting element 100, the second organic light-emitting element 200, and the third organic light-emitting element 300 independently.

[0170] Next, an insulating layer 5 was formed on the lower electrode 2. First, a layer made of SiO was formed by CVD. Then, openings were made in the insulating layer 5 made of SiO so as to expose the lower electrodes 2 of the first organic light-emitting element 100, the second organic light-emitting element 200, and the third organic light-emitting element, respectively, to form a first light-emitting region 101, a second light-emitting region 201, and a third light-emitting region 301.

[0171] Next, an organic compound layer 3 was formed on the lower electrode 2 so as to extend across each organic light-emitting element. Specifically, the organic compound layer 3 was formed by forming, in this order from the lower electrode 2 side, a hole injection layer, a hole transport layer, an electron blocking layer, a blue light-emitting layer 33, a green light-emitting layer 32, a red light-emitting layer 31, an electron transport layer, and an electron injection layer.

[0172] The hole injection layer was formed from the following compound 1 and had a thickness of 3 nm. The hole transport layer was formed from the following compound 2 and had a thickness of 15 nm. The electron blocking layer was formed from the following compound 3 and had a thickness of 10 nm.

[0173] The blue light-emitting layer 33 was formed to a thickness of 10 nm using the following compound 4 as a host material at a weight ratio of 97% and the following compound 5 as a light-emitting dopant at a weight ratio of 3%. The green light-emitting layer 32 was formed to a thickness of 10 nm using the following compound 4 as a host material at a weight ratio of 99% and the following compound 6 as a light-emitting dopant at a weight ratio of 1%. The red light-emitting layer 31 was formed to a thickness of 10 nm using the following compound 4 as a host material at a weight ratio of 99% and the following compound 7 as a light-emitting dopant at a weight ratio of 1%.

[0174] The electron transport layer was formed from the following compound 8 and had a thickness of 40 nm. The electron injection layer was formed from lithium fluoride and had a thickness of 1 nm.

[0175] [ka]

[0176] Next, a layer made of an MgAg alloy was formed to a thickness of 10 nm as the upper electrode 4. The ratio of Mg to Ag was 1:1. After that, a SiN film was formed to a thickness of 2 μm by CVD as the sealing layer 6. Furthermore, a planarization layer 7 was formed to a thickness of 300 nm on the SiN film by spin coating.

[0177] Next, a color filter layer 13 was formed on the planarization layer 7. The color filter layer 13 included a first color filter 131 that transmits red component light, a second color filter 132 that transmits green component light, and a third color filter 133 that transmits blue component light, each of which had a thickness of 1 μm. The first color filter 131 was formed to overlap the first light-emitting region 101 of the first organic light-emitting element 100 in a planar view. The second color filter 132 was formed to overlap the second light-emitting region 201 of the second organic light-emitting element 200 in a planar view. The third color filter 133 was formed to overlap the third light-emitting region 301 of the third organic light-emitting element 300 in a planar view.

[0178] Next, the planarization layer 8 was formed on the color filter layer 13 .

[0179] Next, light extraction structures 110, 210, and 310 having spherical surfaces were formed on the planarization layer 8 as light extraction structures corresponding to the first organic light-emitting element 100, the second organic light-emitting element 200, and the third organic light-emitting element 300, respectively. The light extraction structures 110, 210, and 310 were placed in contact with air.

[0180] (Comparative Example 1) A light-emitting device of Comparative Example 1 was formed in the same manner as in Example 1, except for the thicknesses of the optical interference layers 121, 122, and 123. In Comparative Example 1, the thickness of the optical interference layer 121 was 202 nm, the thickness of the optical interference layer 122 was 177 nm, and the thickness of the optical interference layer 123 was 156 nm. In the light-emitting device of Comparative Example 1, the optical interference layer 121 of the first organic light-emitting element 100, the optical interference layer 122 of the second organic light-emitting element 200, and the optical interference layer 123 of the third organic light-emitting element 300 all had thinner thicknesses than the light-emitting device of Example 1.

[0181] (Comparison between Example 1 and Comparative Example 1) In Example 1, the phase shift upon reflection at the reflective surface S2, which is the upper surface of the reflective layer 11, was -150 degrees. The peak wavelength of the PL spectrum of Compound 5 was 460 nm. The peak wavelength of the PL spectrum of Compound 6 was 530 nm. The peak wavelength of the PL spectrum of Compound 7 was 610 nm.

[0182] In the first organic light-emitting element 100 of the light-emitting device of Example 1, the direction of light traveling in the red light-emitting layer 31 when light having a peak wavelength of 610 nm in the PL spectrum of Compound 7 is intensified was calculated. As a result, the angle formed between this direction and the normal direction to the main surface S1 of the substrate 1 was 15 degrees.

[0183] In the second organic light-emitting element 200 of the light-emitting device of Example 1, the direction of light traveling in the green light-emitting layer 32 when light having a peak wavelength of 530 nm in the PL spectrum of Compound 6 is intensified was calculated. As a result, the angle formed between this direction and the normal direction to the main surface S1 of the substrate 1 was 15 degrees.

[0184] In the third organic light-emitting element 300 of the light-emitting device of Example 1, the direction of light traveling in the blue light-emitting layer 33 when light having a peak wavelength of 460 nm in the PL spectrum of Compound 7 is intensified was calculated. As a result, the angle formed between this direction and the normal direction to the main surface S1 of the substrate 1 was 15 degrees.

[0185] In the first organic light-emitting element 100 of the light-emitting device of Example 1, a ray of light emitted from a light-emitting point located 1.2 μm from the center of the first light-emitting region 101 toward the periphery in a planar view was traced. As a result, it was confirmed that when the light traveled in the red light-emitting layer 31 in a direction forming a 15-degree angle with the normal to the main surface S1 of the substrate 1, it reached the inclined portion 21 of the light-extraction structure 110. In this case, the inclined portion 21 was part of the spherical shape of the light-extraction structure 110, and the inclination angle was 50 degrees. Furthermore, the light-emitting point was located on a circle with a radius of 1.2 μm, centered at the center of the first light-emitting region 101. The inclined portion 21 was located on a circle surrounding the circle on which the light-emitting point was located in a planar view. Furthermore, it was confirmed that the light traveling in the above direction was refracted when it reached the inclined portion 21 and was emitted in a direction approximately perpendicular to the main surface S1 of the substrate 1.

[0186] In the second organic light-emitting element 200 of the light-emitting device of Example 1, a ray of light emitted from a light-emitting point located 1.2 μm from the center of the second light-emitting region 201 toward the periphery in a planar view was traced. As a result, it was confirmed that when the light traveled in the green light-emitting layer 32 in a direction forming an angle of 15 degrees with the normal to the main surface S1 of the substrate 1, it reached the inclined portion 21 of the light-extraction structure 210. In this case, the inclined portion 21 was part of the spherical shape of the light-extraction structure 210, and the inclination angle was 50 degrees. Furthermore, the light-emitting point was located on a circle with a radius of 1.2 μm, centered at the center of the second light-emitting region 201. The inclined portion 21 was located on a circle surrounding the circle on which the light-emitting point was located in a planar view. Furthermore, it was confirmed that the light traveling in the above direction was refracted when it reached the inclined portion 21 and was emitted in a direction approximately perpendicular to the main surface S1 of the substrate 1.

[0187] In the third organic light-emitting element 300 of the light-emitting device of Example 1, a ray of light emitted from a light-emitting point located 1.2 μm from the center of the third light-emitting region 301 toward the periphery in a planar view was traced. As a result, it was confirmed that when the light traveled in the blue light-emitting layer 33 in a direction forming a 15-degree angle with the normal to the main surface S1 of the substrate 1, it reached the inclined portion 21 of the light-extraction structure 310. In this case, the inclined portion 21 was part of the spherical shape of the light-extraction structure 310, and the inclination angle was 50 degrees. Furthermore, the light-emitting point was located on a circle with a radius of 1.2 μm, centered at the center of the third light-emitting region 301. The inclined portion 21 was located on a circle surrounding the circle on which the light-emitting point was located in a planar view. Furthermore, it was confirmed that the light traveling in the above direction was refracted when it reached the inclined portion 21 and was emitted in a direction approximately perpendicular to the main surface S1 of the substrate 1.

[0188] In the first organic light-emitting element 100 of the light-emitting device of Comparative Example 1, the direction of light traveling in the red light-emitting layer 31 when light having a peak wavelength of 610 nm in the PL spectrum of Compound 7 is intensified was calculated. As a result, the angle formed between this direction and the normal direction to the main surface S1 of the substrate 1 was 0 degrees.

[0189] In the second organic light-emitting element 200 of the light-emitting device of Comparative Example 1, the direction of light traveling in the green light-emitting layer 32 when light having a peak wavelength of 530 nm in the PL spectrum of Compound 6 is intensified was calculated. As a result, the angle formed between this direction and the normal direction to the main surface S1 of the substrate 1 was 0 degrees.

[0190] In the third organic light-emitting element 300 of the light-emitting device of Comparative Example 1, the direction of light traveling in the blue light-emitting layer 33 when light having a peak wavelength of 460 nm in the PL spectrum of Compound 7 is intensified was calculated. As a result, the angle formed between this direction and the normal direction to the main surface S1 of the substrate 1 was 0 degrees.

[0191] (Comparison of characteristics between Example 1 and Comparative Example 1) The same amount of current was passed through the light emitting device of Example 1 and the light emitting device of Comparative Example 1 to cause each organic light emitting element to emit light, and the luminance in the front direction was evaluated. As a result, the luminance in the front direction of the light emitting device of Example 1 was 1.3 times that of the light emitting device of Comparative Example 1. Therefore, Example 1 was able to achieve a higher luminance in the front direction than Comparative Example 1. [Explanation of symbols]

[0192] 1 board 2 Lower electrode (1st electrode) 3 Organic compound layer (organic layer) 4 Upper electrode (second electrode) 10 Light extraction structure 21a 1st slope part 21b 2nd slope part 31 Light-emitting layer D1 1st direction D2 2nd direction D3 Third direction D4 4th direction S1 main surface S2 reflective surface

Claims

1. A light-emitting device having a first organic light-emitting element disposed on a main surface of a substrate, the first organic light-emitting element includes a first electrode, a second electrode, an organic layer including a light-emitting layer sandwiched between the first electrode and the second electrode, a light-extraction structure disposed on a light-emitting side of the organic layer, and a reflective surface disposed so as to sandwich the organic layer between the light-extraction structure and the organic layer; the light-emitting layer comprises a first light-emitting material; an optical distance between the light-emitting layer and the reflecting surface is a value such that, when a peak wavelength of a PL spectrum of the first light-emitting material is defined as a first wavelength, light of the first wavelength traveling through the light-emitting layer in a first direction intersecting a normal direction to the main surface of the substrate and light of the first wavelength traveling through the light-emitting layer in a second direction intersecting a normal direction to the main surface of the substrate and different from the first direction are each more intensified than light of the first wavelength traveling in the normal direction to the main surface, an angle formed between a normal direction of the main surface of the substrate and the first direction and an angle formed between a normal direction of the main surface of the substrate and the second direction have the same absolute value; the light extraction structure has a first inclined portion and a second inclined portion; a first incident light, which is light of the first wavelength that has traveled through the light-emitting layer in the first direction and reached the first inclined portion, is refracted at the first inclined portion and is emitted from the light-extraction structure in a third direction; the second incident light, which is light of the first wavelength that has traveled through the light-emitting layer in the second direction and reached the second inclined portion, is refracted at the second inclined portion and is emitted from the light-extraction structure in a fourth direction; The absolute values ​​of the angle between the normal direction of the main surface of the substrate and the third direction and the angle between the normal direction of the main surface of the substrate and the fourth direction are both equal to or greater than 0 degrees and equal to or less than 5 degrees. A light emitting device characterized by:

2. the first incident light is light obtained by constructively interfering with each other between light of the first wavelength emitted from the light emitting layer toward the first electrode, reflected by the reflecting surface, and traveling in the first direction toward the second electrode, and light of the first wavelength emitted from the light emitting layer in the first direction toward the second electrode; The second incident light is light obtained by constructively interfering with each other due to optical interference between light of the first wavelength emitted from the light emitting layer toward the first electrode, reflected by the reflecting surface, and traveling in the second direction toward the second electrode, and light of the first wavelength emitted from the light emitting layer toward the second electrode in the second direction.

2. The light emitting device according to claim 1.

3. 3. The light emitting device according to claim 1, wherein the following formula (1) is satisfied: Lb / cosθ １ ×(1+sin(90-2θ) １ ))=λ １ ×(m-φb / 360)・・・expression (1) (However, in the above formula (1), λ １ represents the first wavelength (nm), and θ １ represents the angle (degrees) between the first direction and the normal direction of the main surface of the substrate, Lb represents the optical distance (nm) between the light-emitting layer and the reflecting surface, φb represents the phase change (degrees) when reflected by the reflecting surface, and m is an integer of 0 or more.

4. a semi-reflective surface between the organic layer and the light extraction structure; The optical distance between the reflective surface and the semi-reflective surface is a value that intensifies the light of the first wavelength traveling in a first direction through the light-emitting layer and the light of the first wavelength traveling in a second direction that is symmetrical to the first direction with respect to an axis normal to the main surface of the substrate.

4. The light emitting device according to claim 1, wherein the light emitting device is a light emitting device.

5. the first incident light is light in which light of the first wavelength that is emitted from the light emitting layer toward the second electrode, reflected by the semi-reflecting surface toward the first electrode, reflected by the reflecting surface toward the second electrode in the first direction, and light of the first wavelength that is emitted from the light emitting layer in the first direction toward the second electrode are reinforced by optical interference, The second incident light is light in which the light of the first wavelength emitted from the light emitting layer toward the second electrode, reflected by the semi-reflecting surface toward the first electrode, reflected by the reflecting surface and traveling in the second direction toward the second electrode, and the light of the first wavelength emitted from the light emitting layer in the second direction toward the second electrode are reinforced by optical interference.

5. The light emitting device according to claim 4.

6. 6. The light emitting device according to claim 4, wherein the following formula (2) is satisfied: Cost １ × (1 + cos (2θ) １ ))=λ １ ×(,-φb / 360-φt / 360)・・・expression (2) (However, in the above formula (2), λ １ represents the first wavelength (nm), and θ １ represents the angle (degrees) between the first direction and the normal direction of the main surface of the substrate, La represents the optical distance (nm) between the reflecting surface and the semi-reflecting surface, φb represents the phase change (degrees) when reflected on the reflecting surface, φt represents the phase change (degrees) when reflected on the semi-reflecting surface, and l is an integer equal to or greater than 0.

7. 7. The light emitting device according to claim 1, wherein the following formulas (3) and (4) are satisfied: θ ｎ = arcsin(sinθ １ ′ × N １ / N ｎ )... Equation (3) i ｅｘ =-arcsin(sin(-θ ｎ +ψ)×N ｎ / N ｅｘ )+ψ...expression (4) (However, in the above formulas (3) and (4), θ ｎ represents the angle (degrees) between the traveling direction of the first incident light in the light extraction structure and the normal direction of the main surface of the substrate, and θ １ ' represents the angle (degrees) between the first direction and the normal direction of the main surface of the substrate, and θ ｅｘ represents the angle (degrees) between the third direction and the normal direction of the main surface of the substrate, and θ ｎ represents the angle (degrees) between the traveling direction of the first incident light in the light extraction structure and the normal direction of the main surface of the substrate, ψ represents the angle (degrees) between a portion of the first inclined portion on which the first incident light is incident and a line parallel to the main surface of the substrate, or the angle (degrees) between a portion of the second inclined portion on which the second incident light is incident and a line parallel to the main surface of the substrate, N １ represents the refractive index of the light-emitting layer, and N ｎ represents the refractive index of the light extraction structure, and N ｅｘ represents the refractive index of the region where the first incident light is emitted from the first inclined portion or the region where the second incident light is emitted from the second inclined portion. ｎ , θ １ ′, θ ｅｘ is expressed as an angle with a normal to the main surface of the substrate as the starting line, with a clockwise angle being positive and a counterclockwise angle being negative, and ψ is expressed as an angle with a straight line parallel to the main surface of the substrate as the starting line, with a clockwise angle being positive and a counterclockwise angle being negative.

8. a reflective layer disposed opposite the light extraction structure with the first electrode interposed therebetween, The reflective layer has the reflective surface.

8. The light emitting device according to claim 1, wherein the light emitting device is a light emitting device.

9. The light-emitting device further includes a reflective layer disposed opposite the light-extraction structure across the first electrode, an optical interference layer between the first electrode and the reflective layer; 8. The light emitting device according to claim 1, wherein the light emitting device is a light emitting device.

10. The first wavelength is a peak wavelength of the PL spectrum of the first light-emitting material.

9. The light emitting device according to claim 1, wherein the light emitting device is a light emitting device.

11. 11. The light emitting device according to claim 1, wherein the light extraction structure has a curved surface at least in a part including the first inclined portion or the second inclined portion.

12. The light emitting device according to claim 11 , wherein the light extraction structure has a spherical surface in at least a part including the first inclined portion or the second inclined portion.

13. 13. The light emitting device according to claim 1, wherein the light extraction structure is a microlens.

14. The light-emitting point of the first incident light in the light-emitting layer is located between the center of a light-emitting region of the light-emitting layer and the outer periphery of the light-emitting region in a plan view of the substrate.

14. The light emitting device according to claim 1.

15. The light-emitting point of the first incident light in the light-emitting layer surrounds the center of the light-emitting region of the light-emitting layer in a plan view of the substrate.

14. The light emitting device according to claim 1.

16. A light-emitting device having a first organic light-emitting element and a second organic light-emitting element arranged on a main surface of a substrate, the first organic light-emitting element and the second organic light-emitting element each include a first electrode, a second electrode, an organic layer including a light-emitting layer sandwiched between the first electrode and the second electrode, a light-extraction structure disposed on a light-emitting side of the organic layer, and a reflective surface disposed so as to sandwich the organic layer between the light-extraction structure and the organic layer; the organic layer of the first organic light-emitting element includes a first light-emitting layer containing a first light-emitting material, the organic layer of the second organic light-emitting element includes a second light-emitting layer containing a second light-emitting material, In the first organic light-emitting element, an optical distance between the first light-emitting layer and the reflecting surface is such that, when a peak wavelength of a PL spectrum of the first light-emitting material is defined as a first wavelength, light of the first wavelength traveling through the light-emitting layer in a first direction intersecting a normal direction to the main surface of the substrate and light of the first wavelength traveling through the light-emitting layer in a second direction intersecting a normal direction to the main surface of the substrate and different from the first direction are each intensified relative to light of the first wavelength traveling in the normal direction to the main surface, an angle formed between a normal direction of the main surface of the substrate and the first direction and an angle formed between a normal direction of the main surface of the substrate and the second direction have the same absolute value; the light extraction structure has a first inclined portion and a second inclined portion; a first incident light, which is light of the first wavelength that has traveled through the light-emitting layer in the first direction and reached the first inclined portion, is refracted at the first inclined portion and is emitted from the light-extraction structure in a third direction; the second incident light, which is light of the first wavelength that has traveled through the light-emitting layer in the second direction and reached the second inclined portion, is refracted at the second inclined portion and is emitted from the light-extraction structure in a fourth direction; In the second organic light-emitting element, an optical distance between the second light-emitting layer and the reflecting surface is such that, when a peak wavelength of a PL spectrum of the second light-emitting material is defined as a second wavelength, light of the second wavelength traveling through the light-emitting layer in a fifth direction intersecting a normal direction to the main surface of the substrate and light of the second wavelength traveling through the light-emitting layer in a sixth direction intersecting a normal direction to the main surface of the substrate and different from the fifth direction are each intensified relative to light of the second wavelength traveling in the normal direction to the main surface, an angle formed between a normal direction of the main surface of the substrate and the fifth direction and an angle formed between a normal direction of the main surface of the substrate and the sixth direction have the same absolute value; the light extraction structure has a third inclined portion and a fourth inclined portion; the third incident light, which is light of the second wavelength that has traveled through the light-emitting layer in the fifth direction and reached the third inclined portion, is refracted at the third inclined portion and is emitted from the light-extraction structure in a seventh direction; the fourth incident light, which is light of the second wavelength that has traveled through the light-emitting layer in the sixth direction and reached the fourth inclined portion, is refracted at the fourth inclined portion and is emitted from the light-extraction structure in an eighth direction; The absolute values ​​of the angle between the normal direction of the main surface of the substrate and the third direction, the angle between the normal direction of the main surface of the substrate and the fourth direction, the angle between the normal direction of the main surface of the substrate and the seventh direction, and the angle between the normal direction of the main surface of the substrate and the eighth direction are all between 0 degrees and 5 degrees. A light emitting device characterized by:

17. the organic layer of the first organic light-emitting element includes the second light-emitting layer, The organic layer of the second organic light-emitting element includes the first light-emitting layer.

17. The light emitting device according to claim 16.

18. the first wavelength is a peak wavelength of the PL spectrum of the first light-emitting material; The second wavelength is a peak wavelength of the PL spectrum of the second light-emitting material.

18. The light emitting device according to claim 16 or 17.

19. A light-emitting device having a first organic light-emitting element and a second organic light-emitting element arranged on a main surface of a substrate, the first organic light-emitting element and the second organic light-emitting element each include a first electrode, a second electrode, an organic layer including a light-emitting layer sandwiched between the first electrode and the second electrode, a light-extraction structure disposed on a light-emitting side of the organic layer, and a reflective surface disposed so as to sandwich the organic layer between the light-extraction structure and the organic layer; the organic layer of the first organic light-emitting element includes a first light-emitting layer containing a first light-emitting material, the organic layer of the second organic light-emitting element includes a second light-emitting layer containing a second light-emitting material, In the first organic light-emitting element, an optical distance between the first light-emitting layer and the reflecting surface is such that, when a peak wavelength of a PL spectrum of the first light-emitting material is defined as a first wavelength, light of the first wavelength traveling through the light-emitting layer in a first direction intersecting a normal direction to the main surface of the substrate and light of the first wavelength traveling through the light-emitting layer in a second direction intersecting a normal direction to the main surface of the substrate and different from the first direction are each intensified relative to light of the first wavelength traveling in the normal direction to the main surface, an angle formed between a normal direction of the main surface of the substrate and the first direction and an angle formed between a normal direction of the main surface of the substrate and the second direction have the same absolute value; the light extraction structure has a first inclined portion and a second inclined portion; a first incident light, which is light of the first wavelength that has traveled through the light-emitting layer in the first direction and reached the first inclined portion, is refracted at the first inclined portion and is emitted from the light-extraction structure in a third direction; the second incident light, which is light of the first wavelength that has traveled through the light-emitting layer in the second direction and reached the second inclined portion, is refracted at the second inclined portion and is emitted from the light-extraction structure in a fourth direction; In the second organic light-emitting element, an optical distance between the second light-emitting layer and the reflecting surface is such that, when a peak wavelength of a PL spectrum of the second light-emitting material is defined as a second wavelength, light of the second wavelength traveling through the light-emitting layer in a fifth direction intersecting a normal direction to the main surface of the substrate and light of the second wavelength traveling through the light-emitting layer in a sixth direction intersecting a normal direction to the main surface of the substrate and different from the fifth direction are each intensified relative to light of the second wavelength traveling in the normal direction to the main surface, an angle formed between a normal direction of the main surface of the substrate and the fifth direction and an angle formed between a normal direction of the main surface of the substrate and the sixth direction have the same absolute value; the light extraction structure has a third inclined portion and a fourth inclined portion; the third incident light, which is light of the second wavelength that has traveled through the light-emitting layer in the fifth direction and reached the third inclined portion, is refracted at the third inclined portion and is emitted from the light-extraction structure in a seventh direction; the fourth incident light, which is light of the second wavelength that has traveled through the light-emitting layer in the sixth direction and reached the fourth inclined portion, is refracted at the fourth inclined portion and is emitted from the light-extraction structure in an eighth direction; an angle formed between a normal direction to the main surface of the substrate and the third direction, an angle formed between a normal direction to the main surface of the substrate and the fourth direction, an angle formed between a normal direction to the main surface of the substrate and the seventh direction, and an angle formed between a normal direction to the main surface of the substrate and the eighth direction all have absolute values ​​of 0 degrees or more and 5 degrees or less; the full width at half maximum of the PL spectrum of the second luminescent material is greater than the full width at half maximum of the PL spectrum of the first luminescent material; the fifth direction and the sixth direction are smaller than the first direction and the second direction; A light emitting device characterized by:

20. The second light-emitting material is a phosphorescent material.

20. The light emitting device according to claim 19.

21. The first light-emitting material is a fluorescent material.

21. The light emitting device according to claim 20.

22. A light-emitting device having a first organic light-emitting element and a second organic light-emitting element arranged on a main surface of a substrate, the first organic light-emitting element and the second organic light-emitting element each include a first electrode, a second electrode, an organic layer including a light-emitting layer sandwiched between the first electrode and the second electrode, a light-extraction structure disposed on a light-emitting side of the organic layer, and a reflective surface disposed so as to sandwich the organic layer between the light-extraction structure and the organic layer; the organic layer of the first organic light-emitting element includes a first light-emitting layer containing a first light-emitting material, the organic layer of the second organic light-emitting element includes a second light-emitting layer containing a second light-emitting material, In the first organic light-emitting element, an optical distance between the first light-emitting layer and the reflecting surface is such that, when a peak wavelength of a PL spectrum of the first light-emitting material is defined as a first wavelength, light of the first wavelength traveling through the light-emitting layer in a first direction intersecting a normal direction to the main surface of the substrate and light of the first wavelength traveling through the light-emitting layer in a second direction intersecting a normal direction to the main surface of the substrate and different from the first direction are each intensified relative to light of the first wavelength traveling in the normal direction to the main surface, an angle formed between a normal direction of the main surface of the substrate and the first direction and an angle formed between a normal direction of the main surface of the substrate and the second direction have the same absolute value; the light extraction structure has a first inclined portion and a second inclined portion; a first incident light, which is light of the first wavelength that has traveled through the light-emitting layer in the first direction and reached the first inclined portion, is refracted at the first inclined portion and is emitted from the light-extraction structure in a third direction; the second incident light, which is light of the first wavelength that has traveled through the light-emitting layer in the second direction and reached the second inclined portion, is refracted at the second inclined portion and is emitted from the light-extraction structure in a fourth direction; In the second organic light-emitting element, an optical distance between the second light-emitting layer and the reflecting surface is such that, when a peak wavelength of a PL spectrum of the second light-emitting material is defined as a second wavelength, light of the second wavelength traveling through the light-emitting layer in a fifth direction intersecting a normal direction to the main surface of the substrate and light of the second wavelength traveling through the light-emitting layer in a sixth direction intersecting a normal direction to the main surface of the substrate and different from the fifth direction are each intensified relative to light of the second wavelength traveling in the normal direction to the main surface, an angle formed between a normal direction of the main surface of the substrate and the fifth direction and an angle formed between a normal direction of the main surface of the substrate and the sixth direction have the same absolute value; the light extraction structure has a third inclined portion and a fourth inclined portion; the third incident light, which is light of the second wavelength that has traveled through the light-emitting layer in the fifth direction and reached the third inclined portion, is refracted at the third inclined portion and is emitted from the light-extraction structure in a seventh direction; the fourth incident light, which is light of the second wavelength that has traveled through the light-emitting layer in the sixth direction and reached the fourth inclined portion, is refracted at the fourth inclined portion and is emitted from the light-extraction structure in an eighth direction; an angle formed between a normal direction to the main surface of the substrate and the third direction, an angle formed between a normal direction to the main surface of the substrate and the fourth direction, an angle formed between a normal direction to the main surface of the substrate and the seventh direction, and an angle formed between a normal direction to the main surface of the substrate and the eighth direction all have absolute values ​​of 0 degrees or more and 5 degrees or less, The first organic light-emitting element satisfying the following formula (5): Lb1 / osθ １ ×(1+sin(90-2θ) １ ))=λ １ ×(m1-φb1 / 360)・・・formula (5) (However, in the above formula (5), λ １ represents the first wavelength (nm), and θ １ represents the angle (degrees) between the first direction and the normal direction of the main surface of the substrate, Lb1 represents the optical distance (nm) between the light-emitting layer and the reflecting surface, φb1 represents the phase change (degrees) when reflected by the reflecting surface, and m1 is an integer equal to or greater than 0. The second organic light-emitting element satisfies the following formula (6): Lb2 / cosθ ２ × (1 + sin(90 - 2θ ２ )) = λ ２ × (m2 - φb2 / 360) ··· Equation (6) (However, in the above formula (6), λ ２ represents the second wavelength (nm), and θ ２ represents the angle (degrees) between the fifth direction and the normal direction of the main surface of the substrate, Lb2 represents the optical distance (nm) between the light-emitting layer and the reflecting surface, φb2 represents the phase change (degrees) when reflected by the reflecting surface, and m2 is an integer of 0 or more. The m2 is smaller than the m1, the fifth direction and the sixth direction are smaller than the first direction and the second direction; A light emitting device characterized by:

23. The m2 is 0 and the m1 is 1.

23. The light emitting device according to claim 22,

24. A light-emitting device having a first organic light-emitting element, a second organic light-emitting element, and a third organic light-emitting element arranged on a main surface of a substrate, the first organic light-emitting element, the second organic light-emitting element, and the third organic light-emitting element each include a first electrode, a second electrode, an organic layer including a light-emitting layer sandwiched between the first electrode and the second electrode, a light-extraction structure disposed on the light-emitting side of the organic layer, and a reflective surface disposed so as to sandwich the organic layer between the light-extraction structure and the organic layer; the organic layer of the first organic light-emitting element includes a first light-emitting layer containing a first light-emitting material, the organic layer of the second organic light-emitting element includes a second light-emitting layer containing a second light-emitting material, the organic layer of the third organic light-emitting element includes a third light-emitting layer containing a third light-emitting material, In the first organic light-emitting element, an optical distance between the first light-emitting layer and the reflecting surface is such that, when a peak wavelength of a PL spectrum of the first light-emitting material is defined as a first wavelength, light of the first wavelength traveling through the light-emitting layer in a first direction intersecting a normal direction to the main surface of the substrate and light of the first wavelength traveling through the light-emitting layer in a second direction intersecting a normal direction to the main surface of the substrate and different from the first direction are each intensified relative to light of the first wavelength traveling in the normal direction to the main surface, an angle formed between a normal direction of the main surface of the substrate and the first direction and an angle formed between a normal direction of the main surface of the substrate and the second direction have the same absolute value; the light extraction structure has a first inclined portion and a second inclined portion; a first incident light, which is light of the first wavelength that has traveled through the light-emitting layer in the first direction and reached the first inclined portion, is refracted at the first inclined portion and is emitted from the light-extraction structure in a third direction; the second incident light, which is light of the first wavelength that has traveled through the light-emitting layer in the second direction and reached the second inclined portion, is refracted at the second inclined portion and is emitted from the light-extraction structure in a fourth direction; In the second organic light-emitting element, an optical distance between the second light-emitting layer and the reflecting surface is such that, when a peak wavelength of a PL spectrum of the second light-emitting material is defined as a second wavelength, light of the second wavelength traveling through the light-emitting layer in a fifth direction intersecting a normal direction to the main surface of the substrate and light of the second wavelength traveling through the light-emitting layer in a sixth direction intersecting a normal direction to the main surface of the substrate and different from the fifth direction are each intensified relative to light of the second wavelength traveling in the normal direction to the main surface, an angle formed between a normal direction of the main surface of the substrate and the fifth direction and an angle formed between a normal direction of the main surface of the substrate and the sixth direction have the same absolute value; the light extraction structure has a third inclined portion and a fourth inclined portion; the third incident light, which is light of the second wavelength that has traveled through the light-emitting layer in the fifth direction and reached the third inclined portion, is refracted at the third inclined portion and is emitted from the light-extraction structure in a seventh direction; the fourth incident light, which is light of the second wavelength that has traveled through the light-emitting layer in the sixth direction and reached the fourth inclined portion, is refracted at the fourth inclined portion and is emitted from the light-extraction structure in an eighth direction; In the third organic light-emitting element, an optical distance between the third light-emitting layer and the reflecting surface is such that, when a peak wavelength of a PL spectrum of the third light-emitting material is defined as a third wavelength, light of the third wavelength traveling through the light-emitting layer in a ninth direction intersecting with a normal direction to the main surface of the substrate and light of the third wavelength traveling through the light-emitting layer in a tenth direction intersecting with the normal direction to the main surface of the substrate and different from the ninth direction are each more intensified than light of the third wavelength traveling in the normal direction to the main surface, an angle formed between a normal direction of the main surface of the substrate and the ninth direction and an angle formed between a normal direction of the main surface of the substrate and the tenth direction have the same absolute value; the light extraction structure has a fifth inclined portion and a sixth inclined portion, a fifth incident light, which is light of the third wavelength that has traveled through the light-emitting layer in the ninth direction and reached the fifth inclined portion, is refracted at the fifth inclined portion and is emitted from the light extraction structure in an eleventh direction; sixth incident light, which is light of the third wavelength that has traveled through the light-emitting layer in the tenth direction and reached the sixth inclined portion, is refracted at the sixth inclined portion and is emitted from the light extraction structure in a twelfth direction; an angle formed between a normal direction to the main surface of the substrate and the third direction, an angle formed between a normal direction to the main surface of the substrate and the fourth direction, an angle formed between a normal direction to the main surface of the substrate and the seventh direction, an angle formed between a normal direction to the main surface of the substrate and the eighth direction, an angle formed between a normal direction to the main surface of the substrate and the eleventh direction, and an angle formed between a normal direction to the main surface of the substrate and the twelfth direction all have absolute values ​​of 0 degrees or more and 5 degrees or less, the second wavelength is intermediate between the first wavelength and the third wavelength, the fifth direction and the sixth direction are smaller than the first direction, the second direction, the ninth direction, and the tenth direction; A light emitting device characterized by:

25. 25. The light-emitting device of claim 24, wherein the second organic light-emitting element emits light in green, the first organic light-emitting element emits light in red or blue, and the third organic light-emitting element emits light in red or blue, and the light emission of the third organic light-emitting element is different from the light emission of the first organic light-emitting element.

26. A color filter is provided between the second electrode and the light extraction structure.

26. The light emitting device according to claim 1, wherein the light emitting device is a light emitting device.

27. A light-emitting device according to any one of claims 1 to 26, A display device comprising a transistor connected to the first organic light-emitting element.

28. an optical unit having a plurality of lenses, an image pickup element that receives light that has passed through the optical unit, and a display unit that displays an image picked up by the image pickup element; A photoelectric conversion device, wherein the display section includes the light-emitting device according to any one of claims 1 to 27.

29. 28. An electronic device comprising: a display unit having the light-emitting device according to claim 1; a housing in which the display unit is provided; and a communication unit provided in the housing for communicating with the outside.

30. 28. A lighting device comprising: a light source having the light-emitting device according to claim 1; and a light diffusion section or optical film that transmits light emitted by the light source.

31. A moving body comprising: a lighting fixture having the light-emitting device according to any one of claims 1 to 27; and a body on which the lighting fixture is provided.

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