TWI666794B - Organic optoelectronic component package device - Google Patents

Abstract

An organic optoelectronic element packaging device includes a substrate, an organic optoelectronic element formed on the substrate, a cover plate above the organic optoelectronic element, a gas blocking unit, and a substrate for fixing the substrate to the cover plate. Layer of adhesive. The gas blocking unit includes at least one barrier layer disposed between the substrate and the cover plate. The at least one barrier layer is an oxide or nitride, and surrounds the organic photovoltaic element to seal the organic photovoltaic element between the substrate and the substrate. Cover room. By providing the gas blocking unit, and it is a material with high gas barrier properties such as oxides or nitrides, it has a good effect of blocking water vapor and oxygen, and can prevent water vapor and oxygen from reacting with the organic photovoltaic element, so It can prolong the service life of the organic photoelectric element.

Description

Organic optoelectronic element packaging device

The present invention relates to a packaging device, and particularly to an organic photovoltaic element packaging device.

Referring to FIG. 1, a known organic photovoltaic element 91, such as an organic light emitting diode (OLED) or an organic photovoltaic element (OPV), must be encapsulated to prevent water and oxygen molecules from reacting with organic molecules to cause element degradation. This leads to a rapid reduction in life. The organic photovoltaic element 91 is usually formed on a substrate 92. A cover plate 93 is placed on the organic photovoltaic element 91 during packaging, and an adhesive material 94 is used to adhere between the cover plate 93 and the periphery of the substrate 92. To form a seal.

However, because the water vapor transmission rate (WVTR) of the rubber material 94 is high, water and oxygen can still pass through the rubber material 94 itself, or the interface between the rubber material 94 and the substrate 92, or the rubber material 94 and the cover. The interface of the plate 93 penetrates into the periphery of the organic photovoltaic element 91 (the lateral penetration of water and oxygen is shown in the arrow of FIG. 1), thereby reducing the service life of the element. In the process of bonding with the adhesive material 94, the cover plate 93 and the substrate 92 must be pressed against each other after dispensing, so that the adhesive material 94 is compacted and fastened, but it is in the form of a paste when the adhesive material 94 is not yet dry. It is easy to overflow during lamination, so the thickness and width of the gas barrier structure formed by the rubber material 94 are not easy to control, and this will also affect the gas barrier performance. The above problems need to be improved.

It is therefore an object of the present invention to provide an organic photovoltaic element packaging device capable of overcoming at least one of the disadvantages of the prior art.

Therefore, the organic optoelectronic element packaging device of the present invention includes a substrate including a first surface, an organic optoelectronic element formed on the first surface of the substrate, a cover plate, a gas blocking unit, and an adhesive layer.

The cover plate is opposite to the substrate and is located above the organic optoelectronic element. The cover plate includes a second surface facing the first surface. The gas blocking unit includes at least one barrier layer disposed between the first surface of the substrate and the second surface of the cover plate. The at least one barrier layer surrounds the organic photovoltaic element and seals the organic photovoltaic element between the substrate and the substrate. Between the cover plates, the at least one barrier layer is oxide or nitride. The adhesive layer is adhered between the first surface and the second surface to fix the substrate and the cover plate.

The effect of the present invention is that by adding the gas blocking unit, and the gas blocking unit is a material with high gas barrier properties such as oxides or nitrides, it can produce a good effect of blocking water and oxygen, and prolong the use of the organic photovoltaic element. life. The gas barrier unit is a hard material, and is a solid film layer after being formed. Therefore, the gas barrier structure formed by the gas barrier unit is stable, and dimensions such as thickness and width are easy to control.

Referring to FIG. 2, an embodiment of an organic photovoltaic device packaging device according to the present invention includes a substrate 1, an organic photovoltaic device 2, a cover plate 3, a gas blocking unit 4, and an adhesive layer 5.

The substrate 1 may be metal, glass, or a flexible material, and includes a first surface 11 facing upward.

The organic photovoltaic element 2 is formed on the first surface 11 of the substrate 1, and is, for example, an organic light emitting element or an organic solar cell. The organic light emitting element is specifically an organic light emitting diode (OLED).

The cover plate 3 is opposite to the substrate 1 and is located above the organic photovoltaic element 2. The cover plate 3 can be made of metal, glass, or flexible material, and includes a horizontal top wall 31, and a ring 30 extending downward from the peripheral edge of the top wall 31 and defining a groove 30 together with the top wall 31.的 围墙 32。 The surrounding wall 32. The top wall 31 and the surrounding wall 32 define a second surface 33 facing the first surface 11. The cover plate 3 is not the improvement focus of the present invention, and its structure need not be limited during implementation. For example, the cover plate 3 may also be horizontally plate-shaped as a whole.

The gas blocking unit 4 includes two barrier layers 41 disposed between the first surface 11 of the substrate 1 and the second surface 33 of the cover plate 3. The positions of the barrier layers 41 correspond to the downward protrusion of the cover plate 3. The wall 32. The blocking layers 41 surround the organic photovoltaic element 2 and seal the organic photovoltaic element 2 between the substrate 1 and the cover 3. The barrier layers 41 are all ring-shaped, and are arranged in an inner ring and an outer ring, that is, the barrier layer 41 located in the outer ring surrounds the barrier layer 41 located in the inner ring. Each barrier layer 41 is an oxide or a nitride, such as silicon oxide (SiOx), silicon nitride (SiNx), aluminum oxide (AlOx, such as Al ₂ O ₃ ), or any combination of the foregoing materials. The oxide and nitride materials have high density and high gas barrier properties, so they have a good effect on blocking water and oxygen, and have better barrier effects than the adhesive layer 5. With the gas blocking unit 4 surrounding the organic photovoltaic element 2 in a ring shape, it can effectively block water and oxygen penetrating from the lateral direction to the periphery of the organic photovoltaic element 2 so as to extend the life of the element. During implementation, the two barrier layers 41 can be made of the same material or different materials.

Preferably, the thickness h of the gas blocking unit 4 in the vertical direction is 50 nm to 300 nm, and the thickness h is also equivalent to the minimum distance between the first surface 11 and the second surface 33, so the minimum distance is also It is 50 nm to 300 nm. By maintaining the thickness h and the gap at the nanometer level, the gap between the substrate 1 and the cover plate 3 for setting the gas blocking unit 4 is small, and the side of the gas blocking unit 4 can be reduced. Water vapor permeates the cross-sectional area, which is conducive to blocking water and oxygen. Preferably, the lateral width w of each barrier layer 41 is 0.1 mm to 1 mm, and the distance d between the two barrier layers 41 is 0.1 mm to 1 mm. Under the above size limitation, the barrier layer 41 has a sufficient width and an appropriate pitch to achieve the required water and oxygen blocking effect, and this size is suitable for the volume of the device. It should be noted that, when the present invention is implemented, the number of the blocking layer 41 may also be one, three, four or more, and a good water blocking oxygen effect can also be achieved.

The adhesive layer 5 is adhered between the first surface 11 and the second surface 33 to fix the substrate 1 and the cover 3. In addition, the adhesive layer 5 surrounds the organic photovoltaic element 2, and further cooperates with the gas blocking unit 4 to seal the organic photovoltaic element 2 between the substrate 1 and the cover plate 3. In addition, the adhesive layer 5 is adhered to the periphery of the gas blocking unit 4, and the gas blocking unit 4 is covered therein, which can strengthen the firmness of the gas blocking unit 4. The material of the adhesive layer 5 is, for example, but not limited to, a frame adhesive material for liquid crystal panel (LCD) packaging, a frame adhesive material for OLED packaging, or an ultraviolet curing adhesive.

When the device of the present invention is manufactured, the organic photovoltaic element 2 is formed on the first surface 11 of the substrate 1, and the gas blocking unit 4 is formed on the second surface 33 of the cover 3. The gas blocking unit 4 can be formed by vapor deposition or The two barrier layers 41 are formed by sandblasting or the like. The two rings form a ring structure surrounded by inner and outer rings. The space surrounded by the barrier layer 41 of the inner ring is larger than the area where the organic photovoltaic element 2 is located. Then, the adhesive material of the adhesive layer 5 is coated around the gas blocking unit 4, and then the cover plate 3 coated with the adhesive material is adhered and adhered to the substrate 1, and at this time, the organic photovoltaic element 2 will be gas-sealed. Closely sealed in a space surrounded by the barrier layer 41 of the inner ring. Subsequently, the adhesive layer 5 is hardened to fix the cover plate 3 and the substrate 1, and the production is completed. Wherein, the gas blocking unit 4 can also be manufactured on the first surface 11 of the substrate 1, and no component is formed on the cover plate 3. However, the advantage of manufacturing the gas blocking unit 4 on the cover plate 3 in this embodiment is: The cover plate 3 and the substrate 1 are respectively used to form different elements, that is, the gas blocking unit 4 and the organic photoelectric element 2 are formed separately, and they are less likely to interfere with each other in production.

Referring to Figs. 2 and 3, Fig. 3 is a relationship diagram of conductance with time, illustrating experimental results of Experimental Example 1, Experimental Example 2 and Comparative Example of the present invention. The structure of Experimental Example 1 of the present invention is shown in FIG. 2. Two layers of the barrier layer 41 are used, and the materials are both SiOx. The difference between Experimental Example 2 and Experimental Example 1 lies in that Experimental Example 2 only provided a ring-shaped barrier layer 41. The comparative example is a conventional packaging structure described in the prior art, which only uses a glue to block water and oxygen, and is not provided with the barrier layer 41 as in the present invention.

It will be explained here that one of the methods currently used to test the water and gas barrier properties of a sample is the Calcium Test. As metal calcium reacts with water vapor and oxygen, calcium oxide (CaO) or Calcium hydroxide (Ca (OH) ₂ ), which changes the conductivity, so when measuring a sample by the calcium test method, a test layer (the test layer is a calcium film) is formed in the sample and measured. The electrical change curve of the test layer with time can be used to estimate the reaction rate of calcium with infiltrated water vapor and oxygen, and then converted to the water vapor transmission rate (WVTR) of the sample. As can be seen from the change in the conductance with time shown in FIG. 3, compared with the comparative examples, the conductance of the experimental examples 1 and 2 of the present invention can be maintained higher, which means that less water gas and oxygen are penetrated around the element and react with the test layer. This also means that the barrier layer 41 of the present invention does exhibit a good effect of blocking moisture and oxygen. After calculation, the WVTR of Experimental Example 1 of the present invention is 4.6 × 10 ^-6 g / m ² . Day, Experimental Example 2 is 7.6 × 10 ^-6 g / m ² . Day, comparative example is 4.5 × 10 ^-5 g / m ² . Day. This proves that the present invention effectively reduces the permeation rate of water and oxygen by one order (compared to 10 ^-6 and 10 ^-5 ) compared with the conventional packaging structure of the comparative example. In addition, from the verification of the life of the OLED, it is also shown that the life of the OLED element of the present invention is more than 3.7 times that of the conventional package structure.

In summary, by adding the gas blocking unit 4, and the gas blocking unit 4 is a material having a high gas barrier property such as an oxide or a nitride, it has a good effect of blocking water and oxygen, and prolongs the service life of the element. The gas blocking unit 4 is a hard material, and it is a solid film layer after being formed. The thickness and width of the gas blocking unit 4 are fixed. The gas blocking structure thus formed is stable, and the structure size and gas blocking performance are easy to control, which can be avoided. The traditional package only uses the plastic material as the gas barrier structure, but it has the problems that the structure size is not easy to control and the gas barrier performance is difficult to control.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited in this way, any simple equivalent changes and modifications made in accordance with the scope of the patent application and the content of the patent specification of the present invention are still Within the scope of the invention patent.

1‧‧‧ substrate

11‧‧‧ the first side

2‧‧‧Organic Optoelectronic Elements

3‧‧‧ cover

30‧‧‧ groove

31‧‧‧Top wall

32‧‧‧ wall

33‧‧‧Second Side

4‧‧‧Gas blocking unit

41‧‧‧ barrier

5‧‧‧ adhesive layer

h‧‧‧ thickness

w‧‧‧ width

d‧‧‧pitch

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: FIG. 1 is a schematic cross-sectional view illustrating a structure of a known organic photovoltaic element after being packaged; FIG. 2 is the present invention A schematic cross-sectional view of an embodiment of an organic optoelectronic element packaging device; and FIG. 3 is a change diagram of conductance (unit: Siemens, abbreviated as S) over time (days), which shows the experiment of the present invention Measurement results of Example 1, Experimental Example 2 and a Comparative Example.

Claims (8)

An organic optoelectronic element packaging device includes: a substrate including a first side; an organic optoelectronic element formed on the first side of the substrate; a cover plate opposite to the substrate and positioned above the organic optoelectronic element The cover plate includes a second surface facing the first surface; a gas blocking unit including at least a barrier layer disposed between the first surface of the substrate and the second surface of the cover plate, the at least one barrier layer The organic photovoltaic element is sealed between the substrate and the cover plate around the organic photovoltaic element, the at least one barrier layer is oxide or nitride; and an adhesive layer is adhered to the first surface and the second surface. Between the substrate and the cover. The organic optoelectronic element packaging device according to claim 1, wherein the at least one blocking layer is silicon oxide, silicon nitride, aluminum oxide, or any combination of the foregoing materials. The organic optoelectronic element packaging device according to claim 1 or 2, wherein a thickness of the gas blocking unit is 50 nm to 300 nm. The organic optoelectronic element packaging device according to claim 1, wherein a width of the at least one barrier layer is 0.1 mm to 1 mm. The organic optoelectronic element packaging device according to claim 1, wherein the gas blocking unit includes two barrier layers located on an inner ring and an outer ring, and a pitch of the barrier layers is 0.1 mm to 1 mm. The organic optoelectronic element packaging device according to claim 1, wherein the adhesive layer surrounds the organic optoelectronic element, and the gas blocking unit is enclosed therein. The organic optoelectronic element packaging device according to claim 1, wherein the substrate and the cover plate are made of metal, glass, or flexible material. The organic photovoltaic element packaging device according to claim 1, wherein the organic photovoltaic element is an organic light emitting element or an organic solar cell.