Organic optoelectronic component

Abstract

Organic optoelectronic component (100) comprising: - an organic layer sequence (1) with an active layer (10) for emission or absorption of electromagnetic radiation; - a thin-film encapsulation (2) on the organic layer sequence (1); - an absorption layer (4) on the organic layer sequence (1) which is designed to absorb and store a substance harmful to the organic layer sequence (1); - a transport layer (3) directly adjacent to the absorption layer (4), which is designed to transport the harmful substance, wherein - the transport layer (3) has a larger diffusion coefficient and / or a larger transmission rate for the harmful substance than the absorption layer (4) and the absorption layer (4) has a higher storage capacity for the harmful substance than the transport layer (3), so that upon contact with the transport layer (3) the harmful substance is distributed within the transport layer (3) and subsequently absorbed by the absorption layer (4), and - the active layer (10), the transport layer (3) and the absorption layer (4) overlap in a top view in one area.

Description

[0001] An organic optoelectronic component is specified.

[0002] Publication WO 2016 / 026 685 A1 is directed towards an organic converting component.

[0003] Publication WO 2016 / 066 435 A1 describes adhesives with activatable getter materials.

[0004] The publication DE 10 2012 224 310 A1 discloses adhesive tape containing getter materials.

[0005] The publication EP 1 912 732 B1 addresses OLED screens comprising one or more deposits of getter material and a layer of material for H2O transport.

[0006] One problem to be solved is to specify an organic optoelectronic component with a long lifetime.

[0007] This problem is solved by the subject matter of the independent patent claim. Advantageous further developments and embodiments are the subject matter of the dependent patent claims.

[0008] According to at least one embodiment, the organic optoelectronic component comprises an organic layer sequence with an active layer for emitting or absorbing electromagnetic radiation. The organic optoelectronic component is, for example, an organic light-emitting diode, or OLED. The active layer is, in particular, made of organic material. In intended operation, the active layer generates, for example, light in the visible spectral range, such as blue, green, red, yellow, or white light.

[0009] The organic layer sequence is preferably placed between two electrodes, via which the organic layer sequence is electrically contacted during operation.

[0010] According to at least one embodiment, the component comprises a thin-film encapsulation on the organic layer sequence. Preferably, the thin-film encapsulation is applied directly to one of the electrodes, thus being in direct mechanical contact with the electrode. The thin-film encapsulation serves to protect the organic layer sequence and the electrodes from external influences, in particular from the ingress of substances harmful to the organic layer sequence or electrodes, such as moisture or water and / or oxygen. For example, the thin-film encapsulation is a layer of silicon oxide, silicon nitride, or aluminum nitride, which can be deposited onto the organic layer sequence by chemical vapor deposition (CVD), physical vapor deposition (PVD), atomic layer deposition (ALD), or sputtering.

[0011] For example, the layer thickness of the thin-film encapsulation is at least 10 nm, or at least 50 nm, or at least 100 nm, or at least 200 nm. Alternatively or additionally, the layer thickness of the thin-film encapsulation is at most 10,000 nm, or at most 1,000 nm, or at most 400 nm, or at most 300 nm.

[0012] According to at least one embodiment, the component includes an absorption layer on the organic layer sequence. The absorption layer is designed to absorb and permanently store a substance harmful to the organic layer sequence. Such an absorption layer is also frequently referred to as a getter layer. Absorption layers are often used in OLEDs, particularly for the absorption of water and / or oxygen. They act like a sponge for the harmful substance, absorbing it, for example, from the component, so that the harmful substance cannot reach the organic layer sequence, or can only do so to a limited extent. In other words, the absorption layer has a high storage capacity for the harmful substance.

[0013] The absorption layer preferentially stores the harmful substance without releasing it again to a significant extent. It can absorb the harmful substance until its storage capacity is exhausted. Here and in the following, "storage" is understood to mean, in particular, the irreversible absorption of the substance. Irreversible absorption can be achieved, in particular, by designing the absorption layer in such a way that the harmful substance reacts chemically within the absorption layer and is converted into another substance.

[0014] The harmful substance can be water, oxygen, or another substance such as sulfur. A substance harmful to the organic layer sequence attacks the organic layer sequence and / or an electrode, causing the functionality of the electrode or the organic layer sequence, especially the active layer, to be reduced or destroyed. In an OLED, for example, this manifests itself as dark, non-luminous spots appearing in areas where the harmful substance has reached the organic layer sequence.

[0015] According to at least one embodiment, the component comprises a transport layer directly adjacent to the absorption layer. Preferably, the absorption layer is in contact with the transport layer along its entire lateral extent.

[0016] The transport layer is designed to transport or diffuse the harmful substance. That is, when the transport layer comes into contact with a certain quantity of the harmful substance at any point, the harmful substance is absorbed by the transport layer and transported, distributed, or dispersed within the transport layer. In particular, the harmful substance diffuses within the transport layer. Preferably, the transport layer is permeable or partially permeable to the harmful substance.

[0017] According to at least one embodiment, the transport layer has a larger diffusion coefficient and / or a higher transmission rate for the harmful substance than the absorption layer.

[0018] In Fick's law, the diffusion coefficient is used to calculate the thermally induced transport of a substance due to the random movement of particles. The diffusion coefficient can be temperature-dependent and pressure-dependent. According to Fick's law, the particle flux due to diffusion along a direction is given by multiplying the diffusion coefficient by the concentration gradient of the particles along that direction.

[0019] The transmission rate of a material or layer is a well-known measurement that indicates how many grams per square meter per day (g / m²) transmits through a material. 2 ·d)) pass through the material or layer.

[0020] The diffusion coefficient and the transmission rate depend, for example, on the density and / or composition of the material. The higher the diffusion coefficient or the transmission rate, the faster the harmful substance diffuses through the material. In this case, this means that the harmful substance is transported or diffused through the transport layer faster than through the absorption layer.

[0021] The diffusion coefficient and transmission rate depend not only on the physical and chemical properties of the layer or material itself, but also on environmental conditions such as temperature and pressure. For the transmission rate, the concentration gradient of the substance being transported along the direction of transport is particularly crucial. Therefore, to compare the diffusion coefficients or transmission rates of two layers, these values ​​are always given under the assumption of identical conditions. For example, the transmission rate is given in a steady state, where the transmission rate of the harmful substance through the layer no longer changes over time.

[0022] In particular, the diffusion coefficient and / or the transmission rate of the transport layer is greater under the conditions occurring in the component during intended operation, for example, by a factor of at least 2, 5, 10, 50, or 100, than the diffusion coefficient or transmission rate of the absorption layer. Intended operating conditions are defined, for example, by a temperature range between -40 °C and 105 °C (inclusive), between 0 °C and 70 °C (inclusive), or between 0 °C and 40 °C (inclusive), and by the concentrations of the harmful substance typically found in the component.

[0023] The transport layer, for example, has a transmission rate for water and / or oxygen of at least 1 mg / (m²). 2 ·d) or at least 0.1 g / (m²) 2 ·d) or at least 1 g / (m²) 2 ·d) or at least 10 g / (m²) 2·d) or at least 50 g / (m²) 2 ·d) or at least 100 g / (m²) 2 ·d) The transmission rate is specified here, for example, at a temperature of 25 °C, 60 °C, or 85 °C and a pressure of 1.01325 bar. Furthermore, it is specifically assumed that on one side of the transport layer, water and / or oxygen are present at a negligible concentration, whereas immediately on the other side of the transport layer, the concentration of water and / or oxygen is such as that found, for example, in normal ambient air at a relative humidity of 60%, 85%, or 90%. In normal ambient air, the oxygen content is approximately 21% by volume.

[0024] Under these conditions, the absorption layer exhibits, for example, a transmission rate for water and / or oxygen of at most 1 g / (m²). 2 ·d) or at most 0.5 g / (m²) 2 ·d) or at most 0.1 g / (m³) 2 ·d) on.

[0025] According to at least one embodiment, the absorption layer has a greater storage capacity for the harmful substance than the transport layer. Storage capacity is understood to mean, for example, the specific storage capacity, i.e., the storage capacity normalized to a volume. The storage capacity is specified, for example, in the unit wt%. This means that with a storage capacity of, for example, 10 wt%, the layer or the material of the layer can irreversibly absorb a maximum amount of the harmful substance such that this substance occupies 10 wt% within the layer. Alternatively, it can also be specified how many mg of the harmful substance per cm². 3 The material of the absorbent material can be absorbed.

[0026] The storage capacity of a material or layer can, in turn, depend on environmental parameters such as temperature, pressure, or the concentration of the harmful substance in the immediate vicinity of the layer; in the case of water, for example, on the relative humidity. Therefore, when comparing the storage capacities of the transport layer and the absorption layer, identical conditions are again assumed for measuring the storage capacity.

[0027] In particular, the storage capacity of the absorption layer is greater under the conditions occurring in the component during intended operation, for example, by a factor of at least 2, 5, 10, 50, or 100 greater than the storage capacity of the transport layer. Preferably, the transport layer has no storage capacity. That is, the transport layer can absorb and temporarily hold the harmful substance, but does not store it; instead, it can release it again. In particular, the transport layer is designed such that the harmful substance does not chemically react within the transport layer.

[0028] For example, the storage capacity of the absorption layer for water and / or oxygen is at least 5 wt% or at least 8 wt% or at least 10 wt% or at least 12 wt% or at least 14 wt% or at least 0.1 mg / cm² 3or at least 1 mg / cm² 3 or at least 10 mg / cm² 3 or at least 50 mg / cm² 3 or at least 80 mg / cm² 3 Each measured at 25 °C or 60 °C or 90 °C, 1.01325 bar and 60% or 85% or 90% relative humidity or 21 vol% oxygen in the ambient air immediately adjacent to the layers.

[0029] For example, under these conditions, the transport layer has a storage capacity for the harmful substance of at most 2 wt% or at most 1 wt% or at most 0.5 wt% or at most 0.1 wt% or at most 0.01 wt% or at most 10 mg / cm² 3 or at most 1 mg / cm² 3 or at most 0.1 mg / cm² 3 or at most 0.01 mg / cm² 3 on.

[0030] Direct contact between the absorption layer and the transport layer and the ambient air is preferably only established for determining / measuring the absolute transmission rates, diffusion coefficients, and storage capacities of the materials used for the layers. In a component described here, the absorption layer and / or the transport layer are preferably not in direct contact with the ambient air.

[0031] For the organic optoelectronic component, the diffusion coefficients and / or transmission rates and the storage capacities for the harmful substance of the transport layer and the absorption layer are preferably adjusted relative to each other such that, upon contact of the transport layer with the harmful substance, the harmful substance is distributed within the transport layer, particularly along its lateral extent, primarily due to diffusion, and subsequently irreversibly absorbed, i.e., stored, by the absorption layer. The harmful substance diffuses, in particular, from the transport layer into the absorption layer. This is primarily due to the concentration gradient of the harmful substance between the transport layer and the absorption layer.Because the absorption layer converts the harmful substance, for example through a chemical reaction, the concentration of the harmful substance in the absorption layer is lower than in the transport layer.

[0032] Preferably, the component is designed such that, when the harmful substance penetrates the component, the majority of it reaches the transport layer before being absorbed by the absorption layer. For example, the absorption layer is surrounded or encapsulated by the transport layer.

[0033] Here and in the following, lateral extension is understood to mean an extension parallel to a main direction of extension of the active layer or the organic layer sequence.

[0034] The thin-film encapsulation, the absorption layer, and the transport layer can each be permeable or impermeable to radiation generated or absorbed by the active layer during normal operation.

[0035] Furthermore, the thin-film encapsulation, the absorption layer and the transport layer are preferably each one-piece and / or simply connected layers.

[0036] In at least one embodiment, the organic optoelectronic component comprises an organic layer sequence with an active layer for emitting or absorbing electromagnetic radiation. The component further comprises a thin-film encapsulation on the organic layer sequence and an absorption layer on the organic layer sequence, the absorption layer being configured to absorb and store a substance harmful to the organic layer sequence. A transport layer for transporting the harmful substance is located directly adjacent to the absorption layer.The transport layer has a higher diffusion coefficient and / or a higher transmission rate for the harmful substance than the absorption layer, whereas the absorption layer has a higher storage capacity for the harmful substance than the transport layer, so that upon contact with the transport layer the harmful substance spreads within the transport layer and is subsequently absorbed by the absorption layer.

[0037] The present invention is based in particular on the finding that in organic components with thin-film encapsulation and an absorption layer (getter layer), harmful substances, such as moisture or oxygen, usually penetrate the component via its edge region, i.e., at its laterally bounding sides. The incoming harmful substance is then largely absorbed and stored by the absorption layer. However, in this way, the harmful substance is predominantly stored in the component's edge region, so that the storage capacity in this area is quickly reached. In contrast, only a small amount of the harmful substance is stored in the absorption layer in the interior of the component, i.e., in the central region, far from the edge regions. Therefore, there is a risk that the harmful substance will no longer be absorbed in the edge region and will penetrate the thin-film encapsulation to the organic layer sequence, damaging it.

[0038] The present invention utilizes a transport layer that has a higher diffusion coefficient and / or a higher transmission rate for the harmful substance than the absorption layer. The transport layer can transport the harmful substance more quickly from the peripheral regions to the center of the optoelectronic component. From the transport layer, the absorption layer can then absorb and store the harmful substance. In this way, the harmful substance is distributed more uniformly over the entire lateral extent of the absorption layer, thus delaying or preventing the attainment of a local storage capacity in certain areas of the absorption layer, particularly at the edges. This reduces the risk of harmful substances reaching the organic layer sequence.

[0039] A further advantage is that the use of the transport layer allows the component to be tested immediately after its application, but before the application of the absorption layer. The transport layer preferably already provides the component's mechanical stability. For example, the component can then be tested for its moisture resistance before the absorption layer is applied. This is typically carried out in humid ovens where the component is heated to approximately 85 °C at a relative humidity of 95%. Weak points in the thin-film encapsulation would then allow moisture to pass through, which would be noticeable as dark, non-luminous areas in the component. This allows defective components to be rejected. If this quality test were only performed after the absorption layer was applied, a significant portion of the storage capacity would be consumed by the test itself.

[0040] According to at least one embodiment, the transport layer has a thickness of at least 0.1 µm, or at least 1 µm, or at least 5 µm. Alternatively or additionally, the transport layer is at most 1 mm, or at most 100 µm, or at most 20 µm, or at most 10 µm thick. The thickness of a layer is measured here and in the following perpendicular to a principal direction of extension of that layer.

[0041] According to at least one embodiment, the transport layer is in direct mechanical contact with the thin-film encapsulation. For example, the transport layer is applied directly to the thin-film encapsulation and completely covers it.

[0042] According to at least one embodiment, the transport layer is arranged between the absorption layer and the thin-film encapsulation. In this case, direct contact between the thin-film encapsulation and the absorption layer can advantageously be prevented by the transport layer. That is, the transport layer distances the thin-film encapsulation from the absorption layer. This allows for a freer choice of materials for the thin-film encapsulation and the absorption layer, since they do not need to be selected with respect to their mechanical compatibility. Rather, they only need to be mechanically compatible with the transport layer, which is easier to achieve.

[0043] In other words, the transport layer decouples the thin-film encapsulation and the absorption layer.

[0044] According to at least one embodiment, the transport layer, viewed from above, completely covers an active region of the organic layer sequence. The active region is the region of the organic layer sequence in which electromagnetic radiation is absorbed or generated during intended operation.

[0045] According to at least one embodiment, the transport layer comprises or consists of a polymer, such as an epoxy, an acrylate, or a silicone. Preferably, the materials of the transport layer are UV-curable or UV-cured. The transport layer can also comprise or consist of a mixture of these materials. Such materials are particularly suitable for the transport layer when the harmful substance is water / water vapor or oxygen.

[0046] For example, the transport layer should have a material composition with a density between and including 0.7 g / cm³.3 and 1.1 g / cm³ 3 chosen.

[0047] According to at least one embodiment, the absorption layer comprises a polymer with embedded moisture-absorbing or oxygen-absorbing particles. For example, the particles comprise an alkali or an alkaline earth metal. Examples include magnesium, calcium, barium, cesium, cobalt, yttrium, lanthanum, and / or rare earth metals. In particular, the particles may comprise metal oxide compounds such as calcium oxide, barium oxide, magnesium oxide, or zirconium oxide.

[0048] The absorption layer can be a film-like layer, such as double-sided adhesive tape (Pressure Sensitive Adhesive, or PSA). Alternatively, the absorption layer can be applied in a liquid state and subsequently cured. Furthermore, it is possible that the absorption layer remains liquid in the finished component and has, for example, a viscosity of no more than 10. 2 mPa·s or 10 4 mPa·s or 10 6 mPa·s. In other words, the absorption layer can be a solid or a liquid.

[0049] The absorption layer has, for example, a thickness of at least 0.1 µm, or at least 1 µm, or at least 2 µm. Alternatively or additionally, the thickness of the absorption layer is at most 1 mm, or at most 100 µm, or at most 20 µm, or at most 10 µm.

[0050] According to at least one embodiment, the absorption layer is surrounded laterally by an insulating layer. The insulating layer preferably surrounds the absorption layer completely laterally and defines its boundaries. The insulating layer is preferably a layer with a low transmission rate for the harmful substance. For example, the transmission rate for water and / or oxygen at 25 °C, 60 °C, or 90 °C, 1.01325 bar, and one-sided contact with ambient air at a relative humidity of 60%, 85%, or 90% is at most 0.5 g / (m²). 2 ·d) or at most 0.1 g / (m³) 2 ·d) or at most 0.01 g / (m³) 2 ·d) or at most 0.001 g / (m³) 2·d) The insulating layer can be, for example, a polymer layer, in particular an adhesive layer. The insulating layer encapsulates the absorption layer laterally and, during normal operation, is intended to suppress lateral penetration of the harmful substance, i.e., penetration via the edge region of the component. This also increases the service life of the component.

[0051] The insulating layer can also act as a barrier to the absorption layer, especially if the absorption layer is liquid. In this case, the insulating layer can help prevent the absorption layer from overflowing laterally, even during application.

[0052] According to at least one embodiment, in addition to the absorption layer, the transport layer is also laterally surrounded by the insulating layer, preferably completely surrounded. The insulating layer then also serves, for example, as a lateral boundary or barrier for the transport layer.

[0053] According to at least one embodiment, the component comprises a substrate, wherein the organic layer sequence is arranged between the substrate and the thin-film encapsulation. In particular, the organic layer sequence is completely encapsulated by the substrate and the thin-film encapsulation and protected from external influences. Specifically, both the organic layer sequence and the electrodes necessary for contacting the organic layer sequence are arranged between the thin-film encapsulation and the substrate.

[0054] The substrate can be, for example, a support for the component, stabilizing it and making it self-supporting. Examples include a glass substrate, a plastic film, or an insulated metal foil. The substrate can be transparent to radiation generated by the active layer or opaque to radiation.

[0055] According to at least one embodiment, the thin-film encapsulation extends down to the substrate and is, for example, in direct contact with it. In a top view of the component, the thin-film encapsulation completely covers the organic layer sequence. The top view shown here and in the following is a view perpendicular to the main plane of extension of the component or the organic layer sequence.

[0056] According to at least one embodiment, the organic layer sequence is completely encapsulated by the substrate and the thin-film encapsulation, i.e., completely surrounded and enclosed by the thin-film encapsulation and the substrate.

[0057] According to at least one embodiment, the transport layer and / or the absorption layer are extended laterally over the organic layer sequence. In a top view, for example, the organic layer sequence is completely covered by the transport layer and / or the absorption layer. Alternatively, the organic layer sequence can be completely surrounded or encapsulated by the substrate and the absorption layer and / or the transport layer.

[0058] According to at least one embodiment, when viewed from above, the transport layer completely covers the absorption layer. That is, the lateral extent of the transport layer is greater than the lateral extent of the absorption layer. In particular, when viewed from above, the absorption layer is completely surrounded by a continuous band of the transport layer. In this way, the probability is increased that the harmful substance penetrating via the edge region first encounters the transport layer, is then laterally distributed by it, or diffuses within the transport layer, and is subsequently absorbed by the absorption layer.

[0059] According to at least one embodiment, the component further comprises a cover element, wherein the cover element is arranged on the side of the absorption layer facing away from the organic layer sequence. The cover element can, for example, be a metal foil applied to the absorption layer by means of a PSA. For example, the cover element may be opaque to radiation. However, the cover element may also be transparent to radiation generated by the active layer. In this case, the cover element may, for example, be a glass substrate or a water-impermeable plastic film. The cover element may also be in direct contact with the absorption layer.

[0060] According to at least one embodiment, the absorption layer is completely encapsulated by, or surrounded by, the transport layer, the insulating layer, the thin-film encapsulation, and the cover element. For example, every connection from the absorption layer out of the component runs either through the transport layer, the insulating layer, or the cover element. A harmful substance can therefore only reach the absorption layer from the outside if it passes through either the transport layer, the insulating layer, and / or the cover element. The insulating layer and the cover element already ensure that as little of the harmful substance as possible reaches the absorption layer in the first place.

[0061] The following section provides a more detailed explanation of an organic optoelectronic component described herein, using exemplary embodiments and the accompanying drawings. Identical reference symbols indicate identical elements in the individual figures. However, the figures are not to scale; rather, individual elements may be exaggerated for clarity.

[0062] They show: Fig. 1 to 3 cross-sectional views of exemplary embodiments of an organic optoelectronic component, Fig. 4A and Fig. 4B graphene for the transmission capability and storage capacity of the transport layer and the absorption layer.

[0063] In the exemplary embodiment of the Fig. Figure 1 shows a cross-sectional view of an organic optoelectronic component 100. The component 100 is specifically an OLED. The component 100 has an organic layer sequence 1 with an active layer 10. The organic layer sequence 1 is deposited onto a substrate 6. Not shown is... Fig. 1, that the organic layer sequence 1 has electrodes for electrical contact on both the side facing the substrate 6 and on the side facing away from the substrate 6. The substrate 6 is, for example, a glass support or a glass substrate that provides the mechanical stability of the component 100.

[0064] A thin-film encapsulation 2 is applied to the side of the organic layer sequence 1 facing away from the substrate 6. The thin-film encapsulation 2 is based, for example, on silicon oxide or silicon nitride. The thin-film encapsulation 2 is a layer with a thickness of, for example, between 50 nm and 1 µm, which extends over the entire side of the organic layer sequence 1 facing away from the substrate 6 and completely covers it. The thin-film encapsulation 2 serves to protect the organic layer sequence 1 from harmful substances.

[0065] To further protect the organic layer sequence 1 from harmful substances such as water / water vapor or oxygen, an absorption layer 4 or a getter layer 4 is applied to a side of the organic layer sequence 1 facing away from the substrate 6. The absorption layer 4 is designed to irreversibly absorb and store the harmful substance. For example, if moisture or oxygen enters the component 100 via an edge region, the moisture or oxygen is absorbed by the absorption layer 4 and trapped via a chemical reaction. The absorption layer 4 comprises, for example, a polymer matrix with embedded metal oxide particles.

[0066] To better distribute the harmful substance across the entire lateral extent of the absorption layer 4, a transport layer 3 is provided between the absorption layer 4 and the thin-film encapsulation 2. The transport layer 3 has, in particular, a higher diffusion coefficient and / or a higher transmission rate for the harmful substance than the absorption layer 4. After the harmful substance has been distributed laterally along the lateral extent of the component 100, it diffuses into the absorption layer 4. Since this results in no or only a small concentration gradient of the harmful substance in the absorption layer 4, the risk of reaching the storage capacity of the absorption layer 4 at its edge is also reduced. Furthermore, the transport layer 3 prevents direct contact between the absorption layer 4 and the thin-film encapsulation 2.

[0067] For example, the transport layer 3 has a thickness between 0.1 µm and 20 µm inclusive and comprises a silicone or an acrylate or an epoxy.

[0068] In the exemplary embodiment of the Fig. The transport layer 3 completely covers the organic layer sequence 1. The absorption layer 4 only partially covers the side of the transport layer 3 facing away from the substrate 6. Laterally, the absorption layer 4 is completely surrounded by an insulating layer 5. The insulating layer 5 comprises, for example, a polymer such as an adhesive and has a low transmission rate of at most 0.1 g / (m²). 2 ·d) on.

[0069] On the side of the transport layer 4 facing away from the substrate 6, a cover element 7 is arranged, which is, for example, a metal foil applied by means of an adhesive. The insulating layer 5 surrounding the absorption layer 4 ensures that even a small amount of the substance harmful to the organic layer sequence penetrates laterally into the component 100 and reaches the absorption layer 4.

[0070] Because the absorption layer 4 is completely surrounded or encapsulated by the insulating layer 5, the covering element 7, the thin-film encapsulation 2, and the transport layer 3, it is also possible to form the absorption layer 4 as a liquid layer. For example, the absorption layer 4 is a liquid polymer layer with metal particles or metal oxide particles incorporated into it.

[0071] In the Fig. Figure 2 shows a further embodiment of an organic optoelectronic component 100. The component of Fig. 2 essentially corresponds to the component of the Fig. 1. Unlike in the Fig. In addition to the absorption layer 4, the transport layer 3 is also completely surrounded laterally by the insulation layer 5. The insulation layer 5 forms a lateral boundary for the absorption layer 4 and the transport layer 3. In this way, the transport layer 3 is also completely encapsulated by the cover element 7 of the insulation layer 5 and the substrate 6, thus reducing the amount of the harmful substance that comes into contact with the transport layer 3.

[0072] In the exemplary embodiment of the Fig. 3 is different from the embodiment of the Fig. 2. The absorption layer 4 is not only partially applied to the side of the transport layer 3 facing away from the substrate 6, but completely covers the transport layer 3. In other words, the transport layer 3 is completely covered by the absorption layer 4. Laterally, the transport layer 3 and the absorption layer 4 are completely surrounded by the insulating layer 5.

[0073] In the Fig. Figure 4A shows an example of the transmission capacity for the harmful substance for transport layer 3 (dashed curve) and for absorption layer 4 (solid line). The y-axis represents the amount of the harmful substance, for example in grams (g), that penetrates one square meter of each layer. The x-axis represents time (t). The transmission rate is the time derivative of the curves shown. As can be seen, after a certain time (t0), the transmission capacity takes the form of a straight line with a constant slope. Thus, a steady state develops for both layers in which the transmission rate assumes a certain value and no longer changes over time. The time t0 that elapses until this point differs for the two layers and depends on several factors, such as the thickness of the respective layer.The following example shows the transmission capacity for water vapor at 25 °C and 60% relative humidity on one side of the layers and 0% relative humidity on the other side of the layers.

[0074] In the Fig.Figure 4B shows an example of the absorption capacity for the harmful substance for transport layer 3 (dashed curve) and absorption layer 4 (solid line). The y-axis shows the mass fraction (wt%) of the harmful substance in the respective layer. The x-axis shows time (t). The absorption rate (wt% / min) is the time derivative of the respective curves. It can be seen that after a certain time, both curves converge to a constant value. At this point, the respective maximum storage capacity of the layers is reached. For example, the absorption capacity for water vapor at 25 °C and 60% relative humidity is shown here. Reference symbol list 1 organic layer sequence 2. Thin-film encapsulation 3 Transport layer 4 Absorption layer 5 Insulation layer 6 Substrat 7 Cover element 10 active layer 100 organic optoelectronic component

Claims

[1] Organic optoelectronic component (100) comprising: - an organic layer sequence (1) with an active layer (10) for emission or absorption of electromagnetic radiation; - a thin-film encapsulation (2) on the organic layer sequence (1); - an absorption layer (4) on the organic layer sequence (1) which is designed to absorb and store a substance harmful to the organic layer sequence (1); - a transport layer (3) directly adjacent to the absorption layer (4), which is designed to transport the harmful substance, wherein - the transport layer (3) has a larger diffusion coefficient and / or a larger transmission rate for the harmful substance than the absorption layer (4) and the absorption layer (4) has a higher storage capacity for the harmful substance than the transport layer (3), so that upon contact with the transport layer (3) the harmful substance is distributed within the transport layer (3) and subsequently absorbed by the absorption layer (4), and - the active layer (10), the transport layer (3) and the absorption layer (4) overlap in a top view in one area. [2] Component (100) according to claim 1, wherein the storage capacity of the absorption layer (4) is greater by a factor of at least 2 than the storage capacity of the transport layer (3). [3] Component (100) according to claim 1 or 2, wherein the transport layer (3) has a transmission rate for water and / or oxygen of at least 1 g / (m²). 2 ·d) exhibits. [4] Component (100) according to one of the preceding claims, wherein the absorption layer (4) has a storage capacity for water and / or oxygen of at least 8 wt%. [5] Component (100) according to one of the preceding claims, wherein the transport layer (3) has a thickness between 0.1 µm and 1 mm inclusive. [6] Component (100) according to one of the preceding claims, wherein the transport layer (3) is in direct mechanical contact with the thin-film encapsulation (2). [7] Component according to one of the preceding claims, wherein the transport layer (3) is arranged between the absorption layer (4) and the thin-film encapsulation (2). [8] Component (100) according to one of the preceding claims, wherein the transport layer (3) completely covers an active region of the organic layer sequence (1) when viewed from above, wherein the active region is the region of the organic layer sequence (1) in which electromagnetic radiation is absorbed or generated during intended operation. [9] Component (100) according to one of the preceding claims, wherein - the transport layer (3) comprises or consists of an epoxy or an acrylate or a silicone or a mixture thereof, - the absorption layer (4) comprises a polymer with moisture-absorbing and / or oxygen-absorbing particles incorporated therein. [10] Component (100) according to one of the preceding claims, wherein the absorption layer (4) is laterally surrounded by an insulating layer (5). [11] Component (100) according to the preceding claim, wherein the transport layer (3) is additionally surrounded laterally by the insulation layer (5). [12] Component (100) according to one of the preceding claims, further comprising a substrate (6), wherein the organic layer sequence (1) is arranged between the substrate (6) and the thin-film encapsulation (2). [13] Component (100) according to the preceding claim, wherein the thin-film encapsulation (2) is drawn down to the substrate (6). [14] Component (100) according to one of claims 12 or 13, wherein the organic layer sequence (1) is completely encapsulated by the substrate (6) and the thin-film encapsulation (2). [15] Component (100) according to one of claims 12 to 14, wherein the transport layer (3) and / or the absorption layer (4) are drawn laterally over the organic layer sequence (1). [16] Component (100) according to one of the preceding claims, wherein, in a top view of the component (100), the transport layer (3) completely covers the absorption layer (4). [17] Component (100) according to one of the preceding claims, further comprising a cover element (7), wherein the cover element (7) is arranged on a side of the absorption layer (4) facing away from the organic layer sequence (1). [18] Component (100) according to at least claims 10 and 17, wherein the absorption layer (4) is completely encapsulated by the transport layer (3), the insulation layer (5), the thin-film encapsulation (2) and the cover element (7).

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