Benzo five-membered heterocyclic derivative and organic electroluminescent device thereof

Abstract

The invention provides a benzo five-membered heterocyclic derivative and an organic electroluminescent device thereof, and relates to the technical field of organic photoelectric materials. The benzo five-membered heterocyclic derivative provided by the invention has relatively good electron mobility, can effectively promote transmission balance of holes and electrons, and meanwhile, the benzo five-membered heterocyclic derivative has relatively good hole blocking capability, can effectively block the holes in a light-emitting layer, and increases the recombination probability of the holes and the electrons. When the compound is applied to a hole blocking layer or an electron transport layer of an organic electroluminescent device, the luminous efficiency and the service life of the device can be effectively improved; besides, when the benzo five-membered heterocyclic derivative is applied to the organic electroluminescent device as a light extraction material, the total emission of an interface between an electrode film and a glass substrate and an interface between the glass substrate and air can be effectively solved, and the light extraction efficiency is improved, so that the luminous efficiency of the organic electroluminescent device is improved, and the service life of the organic electroluminescent device is prolonged.

Description

technical field [0001] The invention relates to the technical field of organic photoelectric materials, in particular to a benzo five-membered heterocyclic derivative and an organic electroluminescence device thereof. Background technique [0002] The development of display technology has mainly gone through three stages: cathode ray tube (Cathode Ray Tube, CRT), liquid crystal display (Liquid Crystal Display, LCD) and organic electroluminescent display (Organic Light Emitting Diode, OLED). Among them, the CRTs that were first used in TV and computer displays used green display and single display picture tube displays, but due to their high power consumption, large size, and radiation, they could not achieve large-scale screens and insufficient high-definition pixels. Withdrew from the stage of history. Later, LCD replaced CRT technology and became the mainstream technology in the display field, and its sales share also surpassed that of CRT. However, LCD display technology...

AI Technical Summary

Problems solved by technology

The initial device is the simplest structure including a single-layer organic functional layer. The single-layer organic functional layer is responsible for both electron transport and hole transport, so it has high requirements for the bipolarity of the material; on the other hand, the light-emitting layer directly Contacting the cathode and anode greatly reduces the recombination probability of excitons, resulting in a relatively low luminous efficiency of the device

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