Light-emitting polymer composition and organic EL display device using the same

a technology of light-emitting polymer composition and display device, which is applied in the direction of discharge tube luminescnet screen, natural mineral layered products, etc., can solve the problems of low light-emitting efficiency and short life span of the display device, polymer film shows a bad transfer characteristic, and the light-emitting layer of one color made of high-molecular organic materials is lower in light-emitting efficiency and shorter life span than that of low-molecular organi

Inactive Publication Date: 2005-05-05
SAMSUNG MOBILE DISPLAY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0033] The light-emitting polymer composition further comprises an additive which improves adhesion of the light-emitting composition to a substrate of the organic display device, and lowers the cohesion between the elements of the first and second light-emitting polymers.
[0034] To achieve the above and other objects according to still another aspect of the present invention, there is provided an organic EL dis

Problems solved by technology

However, an organic EL display device having a light-emitting layer of one color made of the high-molecular organic material is lower in light-emitting efficiency and shorter in life span than that of the low-molecular organic material.
On the other hand, in forming a light-emitting layer of a full color, an organic EL display device having the high-molecular organic material has difficulties in patterning red, green and blue light-emitting layers using an ink jet technique or a laser transfer technique, leading to a low light-emitting efficiency and a short life span.
However, in m

Method used

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  • Light-emitting polymer composition and organic EL display device using the same
  • Light-emitting polymer composition and organic EL display device using the same
  • Light-emitting polymer composition and organic EL display device using the same

Examples

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example 1

[0061] The two kinds of light-emitting polymers and the additive are mixed in an appropriate mass ratio and dissolved in a single solvent to prepare the light-emitting polymer composition. One light-emitting polymer is a PPV-based yellow electrolight-emitting polymer available under the trade name “SUPER YELLOW” from Covion Organic Semiconductors GmbH. The other light-emitting polymer is a PFO-based red electrolight-emitting polymer available under the trade name “RED-B” from Dow Chemical Company. The additive is a polystyrene having a molecular weight of 2,500 available from Sigma-Aldrich Corporation.

[0062] The light-emitting polymer composition is sufficiently stirred at a temperature of 60° C. for at least three hours. The light-emitting polymer composition is deposited on a transfer substrate to a thickness 80 nm to thereby form a transfer film. A substrate having an anode electrode pattern is cleaned and then UV / ozone-treated. A hole transporting layer made of a “PEDOT / PSS” fr...

example 2

[0071] The light-emitting polymer is a red electrolight-emitting polymer available under the trade name “AEF 2009 & 2045” from Covion Organic Semiconductors GmbH. The additive is a polystyrene available from Sigma-Aldrich Corporation. The molecular weight of the polystyrene is in a range between 2,000 and 2,500. The closer the molecular weight of the polystyrene is to 2,000, better the edge roughness of the light-emitting layer.

[0072] The light-emitting polymer and the additive are mixed in an appropriate mixing mass ratio and dissolved in a toluene to prepare the light-emitting polymer composition.

[0073] The light-emitting polymer composition is sufficiently stirred at a temperature of 60° C. for at least three hours. The light-emitting polymer composition is deposited on a transfer substrate to a thickness 80 nm to thereby form a transfer film. A substrate having an anode is cleaned and then UV / ozone-treated for fifteen minutes. A hole transporting layer made of “PEDOT / PSS” from...

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Abstract

A light-emitting polymer composition for a light-emitting layer in an organic EL display device includes at least first and second light-emitting polymers having different interfacial characteristics which lower a cohesion between elements of the first and second light-emitting polymers.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of Korean Patent Application No. 2001-66880 filed on Oct. 29, 2001, in the Korean Industrial Property Office, the disclosure of which is incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a light-emitting polymer composition and an organic electroluminescent (EL) display device using the same. [0004] 2. Description of the Related Art [0005] An organic EL display device includes an anode, a hole injection layer, a hole transportation layer, a light-emitting layer, an electron transporting layer, an electron injection layer, and a cathode, which are sequentially stacked on a substrate. [0006] The above-described layers of the organic EL display device are made of a low-molecular organic material or a high-molecular organic material (i.e., a polymer). The layers of the organic EL display device comprising a low-molecular ...

Claims

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Application Information

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IPC IPC(8): C09K11/06H01L51/00H01L51/50H01L51/56H05B33/14
CPCC09K11/06C09K2211/14C09K2211/1408C09K2211/1441H01L51/0013H05B33/14H01L51/0038H01L51/0039H01L51/5012H01L51/56H01L51/0037Y10S428/917H10K71/18H10K85/1135H10K85/114H10K85/115H10K50/11H10K71/00
Inventor KIM, MU-HYUNKWON, JANG-HYUKSUH, MIN-CHUL
Owner SAMSUNG MOBILE DISPLAY CO LTD
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