Hole injection layer of organic small molecular and electroluminescent device thereof

Abstract

The invention discloses an organic micromolecule hole injection layer prepared by using a solution method. An organic film with the thickness of 10-200nm is made from an organic micromolecule hole injection material and the mixed solution of the organic micromolecule hole injection material and other organic functional materials by a wet-process film forming process. The invention also discloses an electroluminescent device of the organic micromolecule hole injection layer prepared by using the solution method. The electroluminescent device sequentially comprises a substrate, a transparent anode, an organic micromolecule hole injection layer, a hole transport layer, an organic luminescent layer, an electron transport layer, an electron injection layer and a cathode. Compared with the electroluminescent device of the micromolecule hole transport layer prepared by using a conventional vacuum deposition method, the organic micromolecule injection electroluminescent device causes the service life of the electroluminescent device to prolong more than 10 times, which can absolutely meet the commercial application requirement of the device.

Description

technical field [0001] The invention belongs to the technical field of organic electroluminescence, and relates to an organic small molecule hole injection layer and an electroluminescence device thereof, in particular to an organic small molecule hole injection layer prepared by a solution film-forming process and the organic small molecule hole injection layer. Molecular hole injection layer for electroluminescent devices. Background technique [0002] The organic electroluminescent device was first reported by C.W.Tang et al. of Kodak Company in 1987 with a double-layer device structure (Appl. Phys. Lett., 51, 913, (1987)). Because organic electroluminescent devices have the advantages of active light emission, low-voltage DC drive, full curing, wide viewing angle, low power, fast response, and low cost, they have broad application prospects. After more than 20 years of development, rapid development has been made in the research and development of materials and the impr...

AI Technical Summary

Problems solved by technology

[0004] However, the P-type doped organic small molecule hole injection layer, the dye-doped organic small molecule hole injection layer and the mixed organic small molecule hole injection transport layer of these P-I-N structure devices with excellent performance are co-evaporated with high vacuum. The method is realized, and the process is more complicated

A general doped hole transport layer requires at least two evaporation sources to work at the same time, and each evaporation source needs to precisely control its evaporation temperature to achieve a certain proportion of doping. In actual production operations, if two materials Or a slight fluctuation in the evaporation temperature of a variety of materials will affect their evaporation rate, resulting in an imbalance in the doping ratio, thereby affecting the performance of the prepared device

It is difficult to accurately control the doping ratio, which is an important shortcoming and deficiency of the doped hole transport layer prepared by high vacuum evaporation, and the requirements for equipment and environment are high, energy consumption is time-consuming, the yield is low, and the corresponding device cost also higher

In addition, it is difficult to achieve large-area uniform deposition by high-vacuum evaporation to prepare a doped hole-transport layer, which is inconsistent with organic electroluminescent devices to large-screen display devices.

Images