Organic electro-luminescence device

Abstract

An organic electro-luminescence device includes a substrate, a hole injection layer disposed on the substrate, an organic layer disposed on the hole injection layer, a buffer layer disposed on the organic layer, and an electron injection layer forming above the buffer layer. The buffer layer is needed for protecting the organic layer while the electron injection layer is being formed. Within, the organic layer includes a light-emitting layer and an electron transporting layer disposed on the light-emitting layer. The electron transporting layer includes Cesium fluoride.

Description

BACKGROUND OF THE INVENTION [0001] (1) Field of the Invention [0002] The present invention relates generally to organic electro-luminescence devices (OLEDs) and particularly to a top-emission organic electro-luminescence device. [0003] (2) Description of the Prior Art [0004] Organic electro-luminescence devices become popular in display technology these days. Comparing to another popular display—liquid crystal display (LCD), the organic electro-luminescence devices have the advantage of self light-emitting. Hence, backlight module is no more needed in a panel display applied OLEDs. [0005] Please refer to FIG. 1, which is a cross-section view of the structure of an organic electro-luminescence device. The electro-luminescence device 100 comprises, in the sequence from bottom to top, a substrate 102, a hole injection layer 104, a hole transport layer 110, a light-emitting layer 120, an electron transporting layer 140, and an electron injection layer 150. Wherein the hole transport lay...

AI Technical Summary

Benefits of technology

[0013] It is an object of the present invention to provide an organic electro-luminescence device with high electron injection efficiency.

[0014] It is another object of the present invention to solve the prior disadvantage of decreased life time of organic materials.

[0015] It is another object of the present invention to provide a method for fabricating an organic electro-luminescence device without complicated process.

Problems solved by technology

Said wires or TFTs would restrict the light utilizing efficiency because of a limited aperture ratio.

While applying conductive transparent material like ITO for the electron injection layer 150, a major issue is that sputtering process of the ITO material would damage the organic materials (140) beneath.

However, while practical estimated, the electron injection efficiency of the organic electro-luminescence device 100a is too poor to apply in commercial application.

This may decrease the life time of the organic electro-luminescence device.

The complicated process (at least three times of movement between different chambers) is a disadvantage of organic electro-luminescence device 100b.

Images