Organic light emitting diode, manufacturing method thereof, pixel structure and manufacturing method thereof

Abstract

The invention discloses an organic light emitting diode. The organic light emitting diode comprises an anode, a hole injection layer, an organic light emitting layer, an electron transport layer and acathode which are sequentially stacked; the work function of the hole injection layer is matched with the highest occupied molecular orbital energy level of the organic light emitting layer. The invention also discloses a pixel structure. The pixel structure comprises a red sub-pixel, a green sub-pixel and a blue sub-pixel arranged in sequence; each of the red sub-pixel, the green sub-pixel and the blue sub-pixel includes an anode, a hole injection layer, an organic light emitting layer, an electron transport layer and a cathode which are sequentially stacked; and in each of the red sub-pixel, the green sub-pixel and the blue sub-pixel, the work function of the hole injection layer is matched with the highest occupied molecular orbital energy level of the organic light emitting layer. According to the organic light emitting diode and the pixel structure of the invention, materials and printing processes are rationally selected during the manufacturing process of the organic light emitting diode and the pixel structure, and therefore, the work functions of the hole injection layers can be matched with the highest occupied molecular orbital energy level of the materials of the organic light emitting layers respectively, so that the organic light emitting diode and the pixel structure can realize excellent light emitting properties.

Description

technical field [0001] The invention belongs to the technical field of light-emitting diodes, and specifically relates to an organic light-emitting diode and a manufacturing method thereof, as well as a pixel structure and a manufacturing method thereof. Background technique [0002] Organic light-emitting diodes (OLEDs) are considered to be the third-generation display technology to replace liquid crystal displays (LCDs) due to their many advantages such as self-luminescence, high contrast, low power consumption, wide viewing angle, short response time, and the ability to prepare flexible devices. OLED is a stacked electroluminescent device with a "sandwich" structure, and its structure generally includes an anode, a hole injection (transport) layer, an organic light-emitting layer, an electron transport layer and a cathode. Wherein, the energy level difference between the hole injection layer and the organic light-emitting layer determines the difficulty of hole injection....

AI Technical Summary

Problems solved by technology

However, for organic light-emitting layer materials with deep highest occupied orbital (HOMO) energy levels (generally referring to HOMO energy levels between 5.5eV and 6.2eV), the relatively large energy level difference between PEDOT:PSS and them will greatly hinder the space Effective injection of holes

At the same time, when preparing the organic light-emitting layer of the RGB multi-color pixel array, the PEDOT:PSS film prepared by the traditional spin-coating method will have the problem of uneven film thickness in the pixel pit when it is spin-coated on a large area, resulting in uneven light emission of the display pixels. , and the spin coating method cannot be used to prepare the organic light-emitting layer of the RGB multi-color pixel array

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