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Organic light emitting diode (OLED) and preparation method thereof, and display panel

A light-emitting diode, organic technology, used in semiconductor/solid-state device manufacturing, electrical components, electrical solid-state devices, etc., can solve the problems of low hole injection layer efficiency, difficulty in hole injection, high lighting voltage, etc., to reduce recombination , improve ability, maintain balance effect

Active Publication Date: 2016-10-12
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the hole transport rate of most materials is much greater than the electron transport rate, it is difficult to ensure its balance in the actual spin coating process, especially after the current mainstream electron injection layer and cathode use LiF / Al, the cathode and electron transport The contact between the layers is almost an ohmic contact, and the electron injection is also close to the ohmic contact. The ohmic contact can allow electrons to be injected smoothly. The efficiency of the organic light-emitting diode is mainly determined by the hole injection, and the work function of the mainstream anode ITO is related to the hole transport layer. The HOMO still has a large band gap, resulting in low efficiency of the hole injection layer, difficulty in hole injection, and high light-up voltage.

Method used

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  • Organic light emitting diode (OLED) and preparation method thereof, and display panel
  • Organic light emitting diode (OLED) and preparation method thereof, and display panel
  • Organic light emitting diode (OLED) and preparation method thereof, and display panel

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Embodiment 1

[0030] This embodiment provides an organic light-emitting diode (Organic Light-Emitting Diode, referred to as OLED) and its corresponding preparation method. The preparation method of the organic light-emitting diode reduces the energy barrier between the hole injection layer and the hole transport layer ( Sometimes referred to as the energy barrier), the hole can be injected more quickly and effectively, the ability of hole injection is improved, and the problem of hole injection efficiency of OLED is solved.

[0031] like figure 1 As shown, the organic light emitting diode includes a cathode 8 (Anode), an electron injection layer 7 (Electron Injection Layer, HIL for short), an electron transport layer 6 (Electron Transport Layer, HTL for short), and a light emitting layer 5 (Light- Emitting Layer (EML for short), Hole Transport Layer 4 (Hole Transport Layer, HTL for short), Hole Injection Layer 3 (Hole Injection Layer, HIL for short) and anode 2, the HOMO of the hole injecti...

Embodiment 2

[0044] This embodiment provides a method for preparing an organic light emitting diode. The method for preparing an organic light emitting diode reduces the energy barrier between the hole injection layer and the hole transport layer, allowing holes to be injected more quickly and effectively, improving the The ability of hole injection solves the problem of hole injection efficiency of OLED.

[0045] In a kind of doping experiment of the organic light-emitting diode of the present embodiment:

[0046] Mix PEDOT / PSS / PFI (PFI is a perfluorinated ionomer) according to the mass ratio (1:6:3.15) and mix evenly (the molecular formula of PFI is as follows Figure 5 shown), spin-coated at 300r / min on an ITO glass substrate with a light-emitting area of ​​2mmx2mm, the measured film thickness was 57nm, and baked on a hot plate at 180°C for 20 minutes in an atmospheric environment. The measured work function is 5.62eV;

[0047] In another doping experiment of the organic light emittin...

Embodiment 3

[0054] This embodiment provides an organic light emitting diode including the embodiment 1 or embodiment 2.

[0055] The display panel can be: electronic paper, OLED panel, mobile phone, tablet computer, TV, monitor, notebook computer, digital photo frame, navigator and any other product or component with display function.

[0056] The display panel has good display effect and long service life.

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Abstract

The invention relates to the field of display technologies, in particular to an organic light emitting diode (OLED), a preparation method thereof and a display panel. The preparation method of the OLED comprises the step of forming a hole transport layer, wherein a polymer subject solution which forms a hole injection layer is doped with polymer objects with surface energy lower than that of the polymer subject solution and ionization potential higher than that of the polymer subject solution, the polymer subject solution and the polymer objects are capable of self-assembly, so that HOMO of the hole injection layer is increased from bottom part to top part, and an energy barrier between the hole injection layer and the hole transport layer is reduced. The preparation method of the OLED reduces the energy barrier between the hole injection layer and the hole transport layer, so that holes can be injected more quickly and effectively, the hole injection capacity is improved, the accumulation of holes in the interface of the hole injection layer is avoided, the light-emitting efficiency of the OLED is improved, the service life of the OLED is prolonged, and the drive operating voltage of the OLED is reduced.

Description

technical field [0001] The invention belongs to the field of display technology, and in particular relates to an organic light emitting diode, a preparation method thereof, and a display panel. Background technique [0002] Organic Lighting-Emitting Diode (OLED) is expected to replace TFT-LCD (Thin Film Transistor-Liquid Crystal Display) due to its many advantages such as self-illumination, thinness, good color gamut, low power consumption, and flexibility. ) of a new generation of display technology. [0003] At present, the efficiency and lifespan of OLED are the key factors that determine whether OLED can enter the market and be accepted by people, and it is also the bottleneck of OLED technology maturity. Aiming at the problem of improving efficiency and lifespan, major panel manufacturers and research institutes have done a lot of research to keep the balance of holes and electrons to the greatest extent so as to improve the luminous efficiency of OLED. Since the hole...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54H01L51/56
CPCH10K85/10H10K50/17H10K71/00
Inventor 贾文斌朱飞飞
Owner BOE TECH GRP CO LTD