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Organic electroluminescence device

An electroluminescent element and electroluminescent technology, applied in electroluminescent light sources, electrical components, organic semiconductor devices, etc., can solve the problems of reduced reliability, uneven film thickness, easy occurrence of short circuits, etc. The effect of the loss of light

Active Publication Date: 2013-12-11
SAMSUNG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, in the concave-convex corrugated structure shown in the above-mentioned Patent Document 1, since the unevenness is formed on the interface of all the layers, the film thickness becomes non-uniform and short circuits are likely to occur, which may reduce the quality of equipment incorporating the organic EL element. reliability concerns

Method used

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  • Organic electroluminescence device
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Examples

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Embodiment 1）

[0056] Example 1 and figure 1 The illustrated organic EL element 1 of the first embodiment corresponds to it. As the substrate 5 , an alkali-free glass plate (No. 1737; manufactured by Corning) having a thickness of 0.7 mm was used, and polymethyl methacrylate (PMMA) as a thermoplastic resin was coated thereon. After that, using a mold formed with triangular grooves with a depth of 50nm and a pitch of 200nm, the temperature is raised to 105°C or higher, which is the glass transition temperature of PMMA, and the mold is crimped. After cooling, the mold is separated from the substrate 5, whereby the mold pattern is separated. By transferring to the resin, fine irregularities 6 in the shape of triangular grooves with a height of 50 nm and a pitch of 200 nm are formed on the substrate 5 .

[0057] Aluminum was deposited as a metal layer 2 with a thickness of 80 nm on the substrate 5 on which the unevenness 6 was formed by a vacuum evaporation method, and was used as a cathode. ...

Embodiment 2）

[0060] Example 2 corresponds to figure 2 The organic EL element 1 of the 2nd Embodiment shown. Aluminum foil (approximately 30 μm thick) was used as the metal layer 2 (substrate), and the same mold as in Example 1 was crimped on the smooth surface side to form fine irregularities 2' in the same triangular groove shape as in Example 1 on the aluminum foil. The light emitting layer 31 was formed on this aluminum foil by the same method as in Example 1. Other than that, the organic EL element 1 was produced in the same manner as in Example 1.

Embodiment 3）

[0062] Example 3 corresponds to image 3 The organic EL element 1 of the 3rd Embodiment shown. As the substrate 5 , an alkali-free glass plate (No. 1737; manufactured by Corning) having a thickness of 0.7 mm was used, and polymethyl methacrylate (PMMA) as a thermoplastic resin was coated thereon. After that, using a mold formed with triangular grooves with a depth of 50nm and a pitch of 200nm, the temperature is raised to 105°C or higher, which is the glass transition temperature of PMMA, and the mold is crimped. After cooling, the mold is separated from the substrate 5, whereby the mold pattern is separated. By transferring to the resin, fine irregularities 6 in the shape of triangular grooves with a height of 50 nm and a pitch of 200 nm are formed on the substrate 5 . Next, aluminum is formed into a film with a thickness of 80 nm on the substrate 5 on which the unevenness 6 is formed by vacuum evaporation to form a metal layer 2 as a reflective layer, and PMMA 100 nm is coa...

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Abstract

An organic EL device (1) is provided with a metal layer (2) whereon projections and recessions (2') on a nano order of magnitude are provided on one face, and a plurality of organic layers (3) that include a light emission layer (31) provided on one side of the metal layer (2). The height of the projections and recessions at each boundary face of the organic layers (3) is configured to be smaller than the projections and recessions (2') disposed on the metal layer (2). This configuration enables, due to the projections and recessions (2') of one of the faces of the metal layer (2), a reduction of the light loss that occurs in the conversion of surface plasmon to propagation light; and by making the projections and recessions of each boundary face of each organic layer (3) smaller than the projections and recessions on the face of the metal layer (2), shorts within the device can be suppressed.

Description

technical field [0001] The present invention relates to the improvement of the light extraction efficiency of an organic electroluminescence element. Background technique [0002] An electroluminescent (EL) element is an element in which a light-emitting layer sandwiched between an anode and a cathode is formed on a transparent substrate. When a voltage is applied between the electrodes, electrons and holes are injected into the light-emitting layer as carriers. Recombine with the generated excitons to emit light. EL elements are broadly classified into organic EL elements in which organic substances are used as fluorescent substances in the light-emitting layer, and inorganic EL elements in which inorganic substances are used. In particular, organic EL elements can emit light with high luminance at low voltage, can obtain various luminous colors according to the type of fluorescent substance, and are easy to manufacture as a flat light-emitting panel, so they are used as v...

Claims

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Application Information

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IPC IPC(8): H05B33/02H01L51/50H05B33/24H05B33/26
CPCY02E10/549H10K77/10H10K50/822H10K50/85H10K2102/3026
Inventor 山名正人加藤大贵中村将启小柳贵裕
Owner SAMSUNG DISPLAY CO LTD
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