A kind of organic electroluminescence device and preparation method thereof

Abstract

The invention discloses an organic electroluminescent device, which comprises sequentially stacked substrates, a first electrode, a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, an electron injection layer and a second electrode, and the hole The injection layer comprises two layers of inorganic nanocolumn thin films stacked up and down, and the inclination angle of the inorganic nanocolumn of the inorganic nanocolumn film near the substrate side is smaller than the inclination angle of the inorganic nanocolumn film of the inorganic nanocolumn film on the side away from the substrate; Small inorganic nano-column films are beneficial to increase the effective contact area between the hole injection layer and the adjacent electrode layer, effectively reduce the barrier height of holes from the anode to the hole injection layer, and reduce the turn-on voltage and operating voltage; the tilt angle The inorganic nano-column film with a large angle can effectively adjust the balance of electrons and holes, and utilize the scattering properties of the inclined nano-column gaps to improve the luminous efficiency without sacrificing power efficiency; the invention also discloses the organic electroluminescence device. Preparation.

Description

technical field [0001] The invention belongs to the technical field of organic electroluminescence display, and in particular relates to an organic electroluminescence device and a preparation method thereof. Background technique [0002] As a new type of semiconductor display technology, organic electroluminescent technology has recently made great achievements in the fields of small and medium-sized mobile devices and large-sized displays. The light-emitting mechanism of organic light-emitting diode (OLED) is that under the action of an external electric field, electrons and holes are injected from the cathode and anode to the organic functional film, respectively, and the injected electrons and holes are transported from the electrons respectively. Layer and hole transport layer migrate to the light-emitting layer, recombine in the light-emitting layer to form excitons, and excitons radiatively transition to generate photons to complete the light-emitting process. [000...

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Problems solved by technology

[0003] In the prior art, an inorganic or P-type doped organic hole injection material is normally evaporated between the anode and the hole transport layer, and an amorphous hole injection layer is formed by atomic or molecular level stacking to reduce the hole density. The injection barrier provides a suitable step for hole injection, improves the hole injection ability, and reduces the turn-on voltage of the device. However, because the mobility of the hole transport material is much greater than that of the electron transport material, it only improves the hole unilaterally. Injection will easily lead to the imbalance of holes and electrons, which will reduce the luminous efficiency; in addition, most of the mass-produced organic hole injection materials are molten, easy to decompose when forming a film, and the decrease in purity will affect the stability of the device, and P-type dyes such as Seriously polluted chambers such as F4TCNQ

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