KR101071892B1 - Packaging Method for White Organic Light Emitting Device and White Organic Light Emitting Lamp - Google Patents

Abstract

The present invention relates to a packaging method of a white organic light emitting diode and a white organic light emitting lamp. The present invention provides a packaging method of a white organic light emitting device including a blue diode and a phosphor layer for color conversion, the method comprising: forming the phosphor layer by coating the inner wall of a case; Installing the blue diode in an inner space of the case; And maintaining the inside of the case in a vacuum or inert gas atmosphere, and sealing the outside with the outside, and a white organic light emitting lamp manufactured by the packaging method. According to the present invention, not only the blue diode but also the phosphor layer is packaged to be blocked from the outside, so that the color stability and the color conversion efficiency are high, the reliability is high, and the process is simple.

White, organic light emitting diode, OLED, packaging, phosphor, lamp

Description

Packaging Method for White Organic Light Emitting Device and White Organic Light Emitting Lamp

The present invention relates to a method for packaging a white organic light emitting diode and a white organic light emitting lamp, and more particularly, in packaging a white organic light emitting diode including a blue diode and a phosphor layer for converting the blue of the blue diode into white. By packaging the blue diode as well as the phosphor layer to be cut off from the outside, a method of packaging a white organic light emitting device having high color stability and color conversion efficiency and high reliability and a simple process, and the white organic light emitting lamp manufactured through the packaging It is about.

An organic light emitting device (OLED) has a structure in which an organic light emitting layer having a thickness of 100 to 200 nm is deposited between two electrodes of an anode and a cathode. At this time, a hole is moved at the anode and an electron is moved to the organic light emitting layer by the voltage applied from the outside to form an exciton, which is an electron hole coupling pair, and the formed excitons are ground. state) and converts the electrical energy that emits light into light energy. The organic light emitting diode (OLED) has many advantages such as low voltage driving, thin thickness, high brightness, fast response speed, and the advantage of using a flexible substrate, and thus has been attracting much attention as a next-generation flat panel display. The research is very active in the fields of application.

In 1963, Pope obtained the voltage of more than 400V to anthracene of several tens of micrometers in thickness and obtained high efficiency electroluminescence by using organic thin film of alumina quinone dye in 1987 by CW Tang and Vanslyke of Kodak. Since it was announced that the organic light emitting device has been rapidly developed, displays using the organic light emitting device have been introduced into the product.

In particular, in recent years, development for applying an organic light emitting device to the field of lighting has been actively made. In order to widely apply the organic light emitting device to the lighting field, the development of the white organic light emitting device is essential. Various methods have been proposed to achieve white color using organic light emitting diodes. In particular, methods have been mainly proposed to convert blue light to white. This will be described with reference to FIG. 1.

In general, the white organic light emitting diode includes a blue diode 2 formed on the substrate 1 and an inorganic phosphor layer 3 for color conversion to white, as shown in FIG. In this case, the blue diode 2 is formed on the anode 2a formed on the substrate 1, the first organic thin film layer 2b formed on the anode 2a, and the blue organic film layer 2b formed on the first organic thin film layer 2b. The light emitting layer 2c has a structure including a second organic thin film layer 2d formed on the blue light emitting layer 2c and a cathode 2e formed on the second organic thin film layer 2d. In addition, the first organic thin film layer 2b may include a hole injection layer and a hole transport layer, and may include an electron injection layer, an electron transport layer, and a hole blocking layer in which the second organic thin film layer 2d is transported.

In this case, the inorganic phosphor layer 3 converts the blue light emitted from the blue diode 2 into a color to be implemented as white. As the inorganic phosphor layer 3, yellow or red inorganic phosphors are mainly used. For example, inorganic substances having a composition of Y (Gd) AG: Ce or (Sr, Ba, Ca) ₂ Si ₅ N ₈ : Eu are used. do. In addition, the inorganic phosphor layer 3 is formed by being applied to the surface of the substrate 1, that is, the lower surface of the substrate 1 (opposite side of the surface on which the anode is formed), as shown in FIG.

In addition, referring to FIG. 2, the white organic light emitting diode as described above is vulnerable to moisture or oxygen, and thus should be packaged through glass or metal cans 5 to prevent external moisture or oxygen from penetrating. At this time, immediately after the white organic light emitting diode is manufactured, the substrate 1 of the organic light emitting diode is bonded to glass or a metal can 5 in an inert gas atmosphere such as nitrogen or argon without exposing the organic light emitting diode to air. The packaging method is the most commonly used packaging method. That is, the edge of the glass or metal can 5 and the board | substrate 1 is sealed-sealed through the adhesive bond layer 4, and is packaged.

However, in the conventional packaging method as described above (FIG. 2), the blue diode 2 may be packaged, but the inorganic phosphor layer 3 that is vulnerable to moisture or oxygen does not have a problem. As a result, the inorganic phosphor layer 3 is exposed to the outside air, resulting in low color stability and color conversion efficiency, thereby lowering reliability. In addition, the present invention cannot be applied to an organic light emitting device that converts blue over time to obtain white, and thus requires a new packaging method.

In addition, the conventional packaging method (FIG. 2) requires a separate process such as covering the inorganic phosphor layer 3 in order to fabricate a lamp by applying a white organic light emitting device to a general lighting device (incandescent lamp, fluorescent lamp, etc.). There is a drawback to this.

The present invention is to solve the problems of the prior art as described above, in packaging a white organic light emitting device including a blue diode and a phosphor layer for color conversion to white, the blue diode as well as the phosphor layer outside By packaging to be blocked, the color stability and color conversion efficiency is high, the reliability is excellent, the packaging method of the white organic light emitting device is simple, and is manufactured through the packaging method and replaced by a general lighting fixture (incandescent, fluorescent, etc.) It is an object to provide a white organic light emitting lamp that can be.

The present invention to achieve the above object,

In the packaging method of a white organic light emitting device comprising a blue diode and a phosphor layer for color conversion,

Forming the phosphor layer on the inner wall of the case;

Installing the blue diode in an inner space of the case; And

While maintaining the inside of the case in a vacuum or inert gas atmosphere, and provides a packaging method of the white organic light emitting device comprising the step of sealing the outside.

In addition, the present invention,

A case maintained in a vacuum or inert gas atmosphere and sealed to the outside;

A blue diode installed in the inner space of the case; And

It provides a white organic light emitting lamp comprising a phosphor layer formed on the inner wall surface of the case.

According to the present invention, the blue diode and the phosphor layer are packaged in a sealed structure to the outside through the case, so that the color stability and the color conversion efficiency are high, so that the reliability is excellent. It is also packaged in a simple process. In addition, the white organic light emitting lamp according to the present invention can replace the existing general lighting equipment (incandescent, fluorescent, etc.).

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention. The accompanying drawings show exemplary embodiments of the present invention, which are provided only to assist in understanding the present invention, and thus the technical scope of the present invention is not limited thereto.

3 is a cross-sectional configuration diagram showing a first form of a white organic light emitting lamp according to the present invention, Figure 4 shows an exemplary cross-sectional configuration diagram of a blue diode applied to the present invention. 5 is a cross-sectional configuration diagram showing a second embodiment of the white organic light emitting lamp according to the present invention.

First, referring to FIG. 3 and FIG. 4, the white organic light emitting diode includes a blue diode 20 and a phosphor layer for color conversion from blue light emitted from the blue diode 20 to white ( 40). In this case, the blue diode 20 may be formed on the substrate 30 as shown in the figure. The substrate 30 may be selected from, for example, a glass substrate or a plastic substrate. The substrate 30 is preferably transparent and may be flexible.

In addition, as illustrated in FIG. 4, the blue diode 20 includes: a first electrode 21 formed on the substrate 30; A first organic thin film layer 22 formed on the first electrode 21; A blue light emitting layer 23 formed on the first organic thin film layer 22; A second organic thin film layer 24 formed on the blue light emitting layer 23; And a second electrode 25 formed on the second organic thin film layer 24.

The first electrode 21 and the second electrode 25 are selected from an anode and a cathode. For example, as shown in FIG. 4, when the first electrode 21 is an anode, the second electrode 25 is a cathode. The material constituting the first electrode 21 and the second electrode 25 is the same as usual. For example, the first electrode 21 and the second electrode 25 may be an oxide transparent electrode selected from indium tin oxide (ITO) and indium zinc oxide (IZO), and Ag, Al, Ni, Pt, Pd, or these. It can be selected from a metal electrode selected from the alloy of.

In this case, when the first electrode 21 is an anode, the first organic thin film layer 22 may include at least one selected from a hole injection layer and a hole transport layer. For example, the first organic thin film layer 22 may include a hole injection layer or a hole transport layer, or may include both a hole injection layer and a hole transport layer. At this time, the hole injection layer and the hole transport layer may be used as the material as usual. The hole injection layer is a layer that facilitates the injection of holes into the blue light emitting layer 23, for example, low-molecular organic materials such as CuPc, TNATA, TCTA, TDAPB and TDATA, or polymers such as PANI and PEDOT. One or more selected from organic materials and the like can be used. In addition, the hole transport layer is a layer for facilitating the transport of holes to the blue light emitting layer 40, for example, polymers such as α-NPB, TPD, s-TAD, MTADATA and the like, low molecular organic materials, or PVK. One or more selected from organic materials and the like can be used.

In addition, when the second electrode 25 is a cathode, the second organic thin film layer 24 may include at least one selected from an electron injection layer, an electron transport layer, and a hole blocking layer. For example, the second organic thin film layer 24 may be an electron injection layer, an electron transport layer or a hole blocking layer, an electron injection layer / electron transport layer, an electron injection layer / hole blocking layer, an electron transport layer / hole blocking layer, or an electron injection layer The electron transport layer / hole blocking layer may have a multilayer structure of one layer or two or more layers. In this case, the electron injection layer, the electron transport layer and the hole blocking layer may be the same material as usual. The electron injection layer is a layer that facilitates the injection of electrons into the blue light emitting layer 23, for example, may be used at least one selected from a commonly used LiF, gallium mixture (Ga complex) and PBD. In addition, the electron transport layer is a layer for facilitating the transport of electrons to the blue light emitting layer 40, for example, one or more selected from commonly used PBD, TAZ and spiro-PBD and the like can be used. In addition, the hole blocking layer is a layer for preventing the transfer of holes to the cathode, for example, can be used commonly used PBD.

The blue light emitting layer 23 emits (generates) blue light, which may include a blue organic light emitting body as usual. For example, the blue light emitting layer 23 may include distyrylarylene (DSA), distyrylarylene derivative, distyrylbenzene (DSB), distyrylbenzene derivative, and DPVBi (4,4′-bis ( 2,2'-diphenyl vinyl) -1,1'-biphenyl), DPVBi derivatives, spiro-DPVBi and spiro-6P (spiro-sexyphenyl), and the like. have. In addition, the blue light emitting layer 23 may further include at least one dopant material selected from the group consisting of styrylamine, perylene, and disperryl biphenyl. In addition, one or more layers of the blue light emitting layer 23 may be formed between the first organic thin film layer 22 and the second organic thin film layer 24.

The blue diode 20 as described above is installed in the inner space of the case 10 as shown in FIG. Specifically, the blue diode 20 is installed in the inner space of the case 10 together with the substrate 30. In this case, the phosphor 40 is formed on the inner wall surface of the case 10. In addition, the inside of the case 10 is maintained in a vacuum or inert gas atmosphere, and the outside is sealed. That is, according to the packaging method of the present invention, the phosphor 40 for color conversion is formed on the inner wall surface of the case 10, the blue diode 20 is provided in the inner space of the case 10, the blue diode 20, of course, the phosphor 40 is packaged inside the case 10 in a sealed structure to the outside. Accordingly, according to the present invention, the white organic light emitting device, that is, the blue diode 20 and the phosphor 40 may be sealed and packaged inside the case 10 in a structure that cannot be in contact with external moisture or air (oxygen). do. The white organic light emitting device is maintained in a vacuum or inert gas atmosphere in the case 10 of the packaging structure as described above, thereby maintaining excellent color stability and color conversion efficiency and reliability. In addition, since the blue diode 20 and the phosphor 40 are simply packaged through the case 10, the manufacturing process is simple. In this case, examples of the inert gas include nitrogen, argon, helium, neon, and the like.

The case 10 is preferably transparent. In the present invention, the case 10 may have various shapes as long as it can seal the white organic light emitting device, that is, the blue diode 20 and the phosphor 40 with the outside. For example, as shown in FIG. 3, the case 10 may have a shape of an incandescent lamp (bulb) used as a general lighting fixture.

In addition, referring to FIG. 3, when the case 10 has a shape of a general incandescent lamp, the case 10 may be sealed to the outside by the socket connection part 61. The socket connection portion 61 is screwed to the socket of a conventional lighting fixture, the electrode wire 50 is connected to the blue diode 20 is drawn inside the socket connection portion 61. At this time, as shown in FIG. 3, two electrode lines 50 are drawn out, which are connected to the anode and the cathode of the blue diode 20 to apply a voltage.

In addition, as shown in FIG. 5, the case 10 may have a shape of a fluorescent lamp used as a general lighting fixture. At this time, as shown in Figure 5, the case 10 has a columnar shape, such as a fluorescent lamp as a conventional lighting fixture, it is sealed with the outside by a packing member 62 coupled to the side. In addition, the packing member 62 has a terminal 60 connected to the socket to the outside, and the terminal 60 and the blue diode 20 are electrically connected through the electrode wire 50.

As described above, the case 10 may have a shape such as an incandescent lamp (FIG. 3) or a fluorescent lamp (FIG. 5) used as a general lighting fixture. However, the present invention is not limited thereto, and the case 10 may have various shapes as long as it can seal the blue diode 20 and the phosphor 40 therein.

On the other hand, the white organic light emitting lamp according to the present invention has a structure in which the white organic light emitting device is packaged in the case 10 by the packaging method according to the present invention as described above.

Specifically, referring to Figures 3 and 5, the white organic light emitting lamp according to the present invention, the case 10 is maintained in a vacuum or inert gas atmosphere, and sealed to the outside; A blue diode 20 installed in the inner space of the case 10; And a phosphor layer 40 formed on an inner wall surface of the case 10. In this case, the blue diode 20 may have a layer structure as shown in FIG. 4 as described above. Specifically, the blue diode 20 may include a first electrode 21 formed on the substrate 30; A first organic thin film layer 22 formed on the first electrode 21; A blue light emitting layer 23 formed on the first organic thin film layer 22; A second organic thin film layer 24 formed on the blue light emitting layer 23; And a second electrode 25 formed on the second organic thin film layer 24. And the material constituting each layer is as described above.

In addition, the case 10 may have a shape such as an incandescent lamp (FIG. 3) or a fluorescent lamp (FIG. 5) as described above. In this case, when the case 10 has a shape such as an incandescent lamp (FIG. 3) or a fluorescent lamp (FIG. 5), the white organic light emitting lamp according to the present invention may replace an existing general lighting fixture (incandescent lamp, fluorescent lamp, etc.). .

On the other hand, the phosphor layer 40 in the present invention can be used as long as it is for the color conversion of the blue light emitted from the blue diode 20 (white) to white. For example, the phosphor layer 40 may be any color capable of converting blue light emitted from the blue diode 20 into yellow or red color. The phosphor layer 40 may include one or more selected from inorganic phosphors and organic phosphors. Specifically, the phosphor layer 40 may include one or more phosphors selected from the group consisting of yellow phosphors and red phosphors. For example, the phosphor layer 40 may include inorganic phosphors such as Y (Gd) AG: Ce and (Sr, Ba, Ca) ₂ Si ₅ N ₈ : Eu, Eu-organic compounds, rubrene And organic phosphors such as DCJTB, but are not limited thereto. Preferably, the organic phosphor may include at least one phosphor selected from the group consisting of Eu-organic compounds, rubrene, DCJTB, and the like.

The phosphor layer 40 more preferably includes an Eu-organic compound for converting the blue color of the blue light emitting layer 40 to red and rubrene for converting the blue color of the blue light emitting layer 40 to yellow. According to the present invention, the Eu-organic compound and rubrene have good color conversion efficiency of converting blue to red and yellow, respectively, and have excellent color stability, thereby realizing high brightness white light.

The Eu-organic compound is an Eu / organic complex containing europium (Eu) as a metal in an organic compound. According to a more preferred aspect of the present invention, the Eu-organic compound is preferably at least one selected from the following formula (1) to (4). Specifically, the Eu-organic compound may be any one selected from the following Chemical Formulas 1 to 4, or two or more selected from them.

[Formula 1]

(Where n is an integer from 1 to 20)

[Formula 2]

(Where n is an integer from 1 to 20)

(3)

(Where n is an integer from 1 to 20)

[Formula 4]

(Where n is an integer from 1 to 20)

Eu-organic compounds represented by the above Chemical Formulas 1 to 4 have good color conversion efficiency for converting blue to red, and have excellent color stability and are usefully applied to the present invention. More preferably, in Formulas 1 to 4, n is 2 to 5.

In addition, the rubrene may be represented by the following Formula 5. Rubrene (5,6,11,12-tetraphenylnaphthacene) represented by the following formula (5) has a good color conversion efficiency of converting blue to yellow, and has excellent color stability and is usefully applied to the present invention.

[Chemical Formula 5]

On the other hand, the phosphor layer 40 may be formed by applying a phosphor composition including a phosphor and a host material on the inner wall surface of the case 10, wherein the phosphor is 0.1 to 90.0 based on the total weight of the phosphor layer 40 It may be included in parts by weight. More specifically, the phosphor layer 40 includes Eu-organic compound and rubrene as phosphors, and the Eu-organic compound is 0.1 to 40.0 parts by weight and rubrene is 0.1 to 4 parts by weight based on the total weight of the phosphor layer 40. It may be included in 40.0 parts by weight. In this case, when the Eu-organic compound and the rubrene are less than 0.1 part by weight, the color conversion efficiency may be low. On the contrary, when the amount exceeds 40.0 parts by weight, the white luminance may be low. In addition, the host material is to promote the bonding force between the case 10 and the phosphor, which is not particularly limited, but may be included in an amount of 20.0 to 99.8 parts by weight based on the total weight of the phosphor layer 40. In this case, the host material may be used, for example, one or more selected from the group consisting of carbazole (carbazole or carbazole derivatives), arylamine, spiro, and the like, but is not limited thereto. Preferably, the host material may be usefully used carbazole derivatives represented by the following formula (6).

[Formula 6]

(Where n is an integer of 1 or more)

Phosphors such as Eu-organic compounds and rubrene may be uniformly dispersed in the carbazole derivative matrix. At this time, n in Formula 6 may be an integer of 1 to 200, more specifically n may be an integer of 1 to 50.

According to the present invention described above, the blue diode 20 and the phosphor layer 40 is packaged in a sealed structure to the outside through the case 10, the color stability and color conversion efficiency is high and the reliability is excellent. It is also packaged in a simple process. In addition, the white organic light emitting lamp according to the present invention can replace the existing general lighting equipment (incandescent, fluorescent, etc.). That is, through the packaging method according to the present invention, a white organic light emitting lamp having a shape of an existing general lighting fixture (incandescent lamp, fluorescent lamp, etc.) may be manufactured.

1 is a cross-sectional configuration of a white organic light emitting device according to the prior art.

2 is a cross-sectional view illustrating a packaging method of a white organic light emitting diode according to the prior art.

3 is a cross-sectional view showing a first embodiment of a white organic light emitting lamp according to the present invention.

4 is an exemplary cross-sectional view of a blue diode applied to the present invention.

5 is a cross-sectional view showing a second embodiment of a white organic light emitting lamp according to the present invention.

Description of the Related Art

10: case 20: blue diode

30 substrate 40 phosphor layer

50: electrode wire 60: terminal

61 socket connection part 62 packing member

Claims (15)

In the packaging method of a white organic light emitting device comprising a blue diode and a phosphor layer for color conversion, Forming a phosphor layer by applying one or more phosphors selected from the group consisting of yellow phosphors and red phosphors to the inner wall of the case; Installing the blue diode in an inner space of a case separated from the phosphor layer; And Maintaining the inside of the case in a vacuum or inert gas atmosphere, the method of packaging a white organic light emitting device comprising the step of sealing the outside. The method of claim 1, The blue diode may include a first electrode formed on a substrate; A first organic thin film layer formed on the first electrode; A blue light emitting layer formed on the first organic thin film layer; A second organic thin film layer formed on the blue light emitting layer; And a second electrode formed on the second organic thin film layer. The method of claim 1, The blue diode is a packaging method of a white organic light emitting device, characterized in that formed on a flat substrate located in the inner space of the case. The method of claim 1, The phosphor layer comprises a Eu-organic compound and rubrene packaging method of a white organic light emitting device, characterized in that. 5. The method of claim 4, The phosphor layer comprises 0.1 to 40.0 parts by weight of Eu-organic compound, and 0.1 to 40.0 parts by weight of rubrene, the packaging method of a white organic light emitting device. The method according to claim 4 or 5, The Eu-organic compound is a packaging method of a white organic light emitting device, characterized in that at least one selected from the formulas (1) to (4). [Formula 1]

(Where n is an integer from 1 to 20) [Formula 2]

(Where n is an integer from 1 to 20) (3)

(Where n is an integer from 1 to 20) [Formula 4]

(Where n is an integer from 1 to 20) A case maintained in a vacuum or inert gas atmosphere and sealed to the outside; A phosphor layer including at least one selected from the group consisting of a yellow phosphor and a red phosphor formed on an inner wall of the case; And White organic light emitting lamp comprising a blue diode installed in the inner space of the case separated from the phosphor layer. The method of claim 7, wherein The blue diode may include a first electrode formed on a substrate; A first organic thin film layer formed on the first electrode; A blue light emitting layer formed on the first organic thin film layer; A second organic thin film layer formed on the blue light emitting layer; And a second electrode formed on the second organic thin film layer. The method of claim 7, wherein The case is a white organic light emitting lamp, characterized in that the shape of incandescent or fluorescent lamps. The method of claim 7, wherein The blue organic light emitting lamp of claim 1, wherein the blue diode is formed on a flat substrate positioned in an inner space of the case. The method of claim 7, wherein The phosphor layer is a white organic light emitting lamp comprising an Eu-organic compound and rubrene. The method of claim 11, The phosphor layer is a white organic light emitting lamp comprising 0.1 to 40.0 parts by weight of Eu-organic compound, and 0.1 to 40.0 parts by weight of rubrene. 13. The method according to claim 11 or 12, The Eu-organic compound is a packaging method of a white organic light emitting device, characterized in that at least one selected from the formulas (1) to (4). [Formula 1]

(Where n is an integer from 1 to 20) [Formula 2]

(Where n is an integer from 1 to 20) (3)

(Where n is an integer from 1 to 20) [Formula 4]

(Where n is an integer from 1 to 20) The method of claim 7, wherein The phosphor layer comprises a phosphor and a host material, The phosphor includes 0.1 to 40 parts by weight of Eu-organic compound and 0.1 to 40 parts by weight of rubrene based on the total weight of the phosphor layer, The host material comprises at least one consisting of carbazole-based, arylamine-based and spiro-based, the organic light emitting lamp of 20 to 99.8 parts by weight based on the total weight of the phosphor layer. The method of claim 1, The phosphor layer comprises a phosphor and a host material, The phosphor includes 0.1 to 40 parts by weight of Eu-organic compound and 0.1 to 40 parts by weight of rubrene based on the total weight of the phosphor layer, The host material comprises at least one consisting of carbazole-based, arylamine-based and spiro-based, 20 to 99.8 parts by weight based on the total weight of the phosphor layer packaging method of a white organic light emitting device.

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