JP2005190678A - Organic el panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic EL panel in which a complicated structure is not needed, in which a manufacturing work is simple, and which has a long lifetime and a high brightness. <P>SOLUTION: This is the organic EL panel composed of an organic EL element which is formed on a support substrate and pinches an organic layer having at least a light-emitting layer with an anode and a cathode, and a sealing member to cover the organic EL element. At least either of the support substrate or the sealing member is provided with a color transformation function. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  According to the present invention, an organic EL (electroluminescence) element formed by sandwiching an organic layer including at least a light emitting layer by a pair of translucent electrodes, at least one of which is disposed on a support substrate, covers the organic EL element. The present invention relates to an organic EL panel formed by bonding a stop member to the support substrate.

An organic EL panel as a display using an organic EL element is a self-luminous element and thus does not require backlight illumination, has a wide viewing angle, and is suitable for a large display panel. Such an organic EL panel 1 is disclosed in Patent Document 1, for example.
JP 2001-126863 A

  One of the methods for converting the color of the organic EL panel is a color conversion filter method. As shown in FIG. 3, the color conversion filter type organic EL panel 1 is formed by forming a color conversion filter 3 and a monochromatic light emitting organic EL element 4 on a translucent support substrate 2 by vapor deposition. The organic EL element 4 includes, for example, a blue filter 3 that is a color conversion filter, a transparent electrode (anode) 5 made of a light-transmitting conductive material such as ITO (indium tin oxide), and holes from the transparent electrode 5 side. An injection layer, a hole transport layer, a yellow light emitting layer 6a, an organic layer composed of an electron transport layer and an electron injection layer (an organic layer having at least the light emitting layer 6a) 6, and a back electrode composed of a conductive material such as aluminum (Al) The cathode) 7 is obtained by sequentially laminating the support substrate 2 on the support substrate 2. The yellow colored light emitted from the organic EL element passes through the blue filter 3 and is extracted as white display light from the support substrate. The organic EL element 4 is covered with a concave sealing plate 8 that is a sealing member, and the support substrate 2 and the sealing plate 8 are hermetically sealed with a sealing agent 9 made of, for example, an ultraviolet curable adhesive. Are joined together.

  The organic EL panel 1 having the above-described configuration usually has the color conversion filter 3 and the organic EL element on the same substrate when color conversion is realized by combining the organic EL element 4 and the color conversion filter 3 that emit single color light. 4 will be laminated. As described above, when the color conversion filter 3 is formed on the support substrate 2 and the organic EL element 4 is further provided, the stress in the ITO thin film, which is a transparent electrode, and the thermal expansion coefficient between the transparent electrode and the color conversion filter are reduced. Since the peeling phenomenon due to the difference occurs, the manufacturing process is complicated and the operation becomes difficult. Moreover, since light is absorbed by the color conversion filter 3, the light emission efficiency is lowered. Depending on the element structure, the characteristics of the element such as short lifetime, low luminance, and low luminous efficiency appear as problems of the organic EL panel 1.

  The present invention focuses on the above-described problems, and provides an organic EL panel 1 that does not require a complicated structure, is easy to manufacture, has a long life, and has a high luminance.

  In order to solve the above-described problems, the present invention provides a support substrate, an organic EL element formed on the support substrate and having an organic layer having at least a light emitting layer sandwiched between an anode and a cathode, and the organic EL element. An organic EL panel including a covering sealing member, wherein at least one of the support substrate and the sealing member has a color conversion function.

  Further, at least one of the support substrate and the sealing member is formed by coloring a color different from the emission color in the light emitting layer.

  In addition, at least one of the support substrate or the sealing member is formed by coloring a color complementary to the light emission color in the light emitting layer.

  A sealing substrate comprising a support substrate, an organic EL element formed on the support substrate and having an organic layer having at least a light emitting layer sandwiched between an anode and a cathode, a flat plate member covering the organic EL element, and a support member An organic EL panel comprising a member, wherein the flat plate member has a color conversion function.

  The flat plate member is formed by coloring a color different from the color of the colored light in the light emitting layer.

  The flat plate member is formed by coloring a color complementary to the color of the colored light in the light emitting layer.

  The present invention relates to an organic EL panel comprising an organic EL element formed on the support substrate and having an organic layer having at least a light emitting layer sandwiched between an anode and a cathode, and a sealing member covering the organic EL element. Using organic EL elements with a simple manufacturing process, long life, high brightness, and high luminous efficiency, display light with a color different from the light obtained from the light emitting layer is extracted, and long life, high brightness, and luminous efficiency It is an object of the present invention to provide an organic EL panel that emits display light having a high desired color.

  The first embodiment of the present invention will be described below with reference to the accompanying drawings. The same or corresponding parts as those in the conventional example are designated by the same reference numerals, and detailed description thereof is omitted.

  FIG. 1 is a cross-sectional view of an organic EL panel showing a first embodiment of the present invention. In the first embodiment, the support substrate 2 has a color conversion function, and an organic EL element that emits white display light L2 to the outside using the organic EL element 4 that emits yellow light in a single color and the support substrate 2 that is colored blue. Panel 1 is shown.

  The organic EL panel 1 includes a support substrate 2, an organic EL element 4, and a sealing plate (sealing member) 8.

  The support substrate 2 is made of blue-colored glass or a blue translucent resin material, supports the organic EL element 4, and takes out the colored light L <b> 1 emitted from the organic EL element 4. The yellow colored light L1 is transmitted through the blue support substrate 2 and becomes white display light L2, and is emitted outside the organic EL panel 1. The support substrate 2 is formed slightly larger than the sealing plate 8 so that the sealing plate 8 can be disposed.

  The organic EL element 4 is formed by sequentially laminating a transparent electrode 5, an organic layer 6, and a back electrode 7 on a support substrate 2 by an appropriate method such as a sputtering method, a spin coating method, or a vapor deposition method.

  The organic layer 6 is formed by sequentially laminating a hole injection layer, a hole transport layer, a light emitting layer 6a, an electron transport layer, and an electron injection layer from the transparent electrode 5 side by means such as vapor deposition, and has a layer shape of 100 to 300 nm. It will be. In the embodiment of the present invention, it is sufficient if it has at least the light emitting layer 6a.

  A transparent conductive material such as ITO (indium tin oxide) is used for the transparent electrode 5. The back electrode 7 is made of a conductive material such as aluminum (Al).

  The sealing plate 8 includes a flat plate member 8a made of, for example, a glass material and a support member 8b, and the support member 8b is disposed on the support substrate 2 with a sealant 9 interposed therebetween, whereby the sealing plate 8 and the support substrate 2 are disposed. The organic EL element 4 can be airtightly stored in a storage space constituted by

  In the organic EL panel 1 of the present embodiment configured by the above-described parts, yellow colored light L1 is generated in the light emitting layer 6a, and the yellow colored light L1 passes through the support substrate 2 colored in blue to the outside. It is extracted as white display light L2. This embodiment utilizes the fact that a mixture of yellow and blue, which are complementary colors, produces an achromatic white color. As a result, when the white display light L2 is to be extracted, the organic EL element 4 that emits the long-life and high-luminance yellow color light L1 and the support substrate 2 having the color conversion function are used. An organic EL panel having higher luminance and longer life than the organic EL element 4 that emits the light L1 can be obtained. In addition, since the process of providing a complicated color conversion filter is eliminated, the manufacturing process can be simplified.

  FIG. 2 is a cross-sectional view of an organic EL panel 1 showing a second embodiment of the present invention. The same or corresponding parts as those of the conventional example and the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the second embodiment, the sealing plate 8 has a color conversion function, and the organic EL element 4 that emits monochromatic light in yellow and the sealing plate 8 colored in blue are used to transmit the white display light L2 to the sealing plate. The organic EL panel 1 taken out from the 8th side is shown.

  The organic EL panel 1 includes a support substrate 2, an organic EL element 4, and a sealing plate 8.

  The support substrate 2 is made of, for example, glass or a resin material, and supports the organic EL element 4. The sealing plate 8 is formed of a flat plate member 8a and a supporting member 8b using a blue-colored glass material or a blue translucent resin material. The yellow colored light L1 passes through the blue sealing plate 8 and becomes white display light L2 and is emitted outside the organic EL panel 1.

  In the organic EL panel 1 of the present embodiment, the yellow colored light L1 is generated in the light emitting layer 6a, and the yellow colored light L1 is transmitted through the sealing plate 8 colored in blue and is whitened to the outside of the organic EL panel 1. The display light L2 is extracted.

  In the first embodiment and the second embodiment, the color conversion is performed so that the yellow color light L1 having a complementary color that becomes an achromatic color when mixed is converted into white display light. In addition, the color of the colored light and the color of the color conversion medium that is the support substrate or the sealing plate do not need to have a complementary color relationship and are arbitrary.

  The present invention having the above structure has a sealing plate or a support substrate for color-converting light generated in the light emitting layer, and has a long lifetime, high luminance, and high luminous efficiency in a simple manufacturing process. It is possible to provide.

Sectional drawing of the 1st Embodiment of this invention. Sectional drawing of the 2nd Embodiment of this invention. Sectional drawing of a prior art example.

Explanation of symbols

1 Organic EL Element Panel 2 Support Substrate 4 Organic EL Element 5 Transparent Electrode (Anode)
6a Light-emitting layer 7 Back electrode (cathode)
8 Sealing plate 8a Flat plate member

Claims (6)

An organic EL panel comprising: a support substrate; an organic EL element formed on the support substrate and having an organic layer having at least a light emitting layer sandwiched between an anode and a cathode; and a sealing member covering the organic EL element. There,
At least one of the support substrate or the sealing member has a color conversion function.   2. The organic EL panel according to claim 1, wherein at least one of the support substrate and the sealing member is colored in a color different from a light emission color in the light emitting layer.   2. The organic EL panel according to claim 1, wherein at least one of the support substrate and the sealing member is colored in a color complementary to a light emission color in the light emitting layer. A support substrate, an organic EL element formed on the support substrate and having an organic layer having at least a light-emitting layer sandwiched between an anode and a cathode, a flat plate member covering the organic EL element, and a sealing member made of a support member An organic EL panel comprising:
The organic EL panel, wherein the flat plate member has a color conversion function.   The organic EL panel according to claim 4, wherein the flat plate member is colored with a color different from the color of the colored light in the light emitting layer.   The organic EL panel according to claim 4, wherein the flat plate member is colored with a color complementary to the color of the colored light in the light emitting layer.

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