Nitrogen-containing heterocyclic ring derivative and application thereof in organic electroluminescent device

Abstract

The invention provides a nitrogen-containing heterocyclic ring derivative and application thereof in an organic electroluminescent device, and relates to the field of organic electroluminescent display. According to the invention, the nitrogen-containing heterocyclic ring derivative provided by the invention has relatively high triplet state energy level, high electron mobility, high refractive index, relatively high glass transition temperature, good thermal stability and film-forming property; when the nitrogen-containing heterocyclic ring derivative is applied to an organic electroluminescent device, the driving voltage of the organic electroluminescent device can be effectively reduced, and the light extraction efficiency of the device is improved, so that the luminous efficiency of the device can be improved, and the service life of the device can be prolonged; and the nitrogen-containing heterocyclic ring derivative has good application effect and good industrialization prospect in the organic electroluminescent device.

Description

technical field [0001] The invention relates to the field of organic electroluminescent display, in particular to a nitrogen-containing heterocyclic derivative and its application in organic electroluminescent devices. Background technique [0002] The basic structure and technology of organic light-emitting diodes (Organic Light-Emitting Diodes, OLEDs) were first discovered by Chinese-American professor Ching W.Tang in 1979 at Kodak Corporation of the United States. OLED technology is widely used in flat panel display, High-end products in the fields of lamp lighting and microdisplay. [0003] Organic electroluminescence is the conversion of electric current into visible light through the internal process of specific organic molecules. The principle of organic electroluminescence can be explained by the following process. When an organic layer is placed between the anode and cathode and a voltage is applied between the two electrodes, Electrons and holes are injected into...

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Problems solved by technology

Although most organic materials have been developed and known to us, there is a great imbalance in the development of various organic materials.

Among them, the development of electron transport materials is relatively backward compared with that of hole transport materials. The hole mobility of hole transport materials is much higher than the electron mobility of electron transport materials, so that the carrier migration cannot be balanced and the excitons cannot be effectively recombined. , leading to low luminous efficiency of organic electroluminescent devices; at the same time, the energy levels of the materials in organic electroluminescent devices do not match, the injection barriers of holes and electrons are high, and the required driving voltage is high. , the carriers dissipate to the side of the hole transport or electron transport layer, and cannot effectively recombine and emit light in the light-emitting layer, resulting in the leakage current phenomenon of the organic electroluminescent device, which affects the life of the device. In order to improve the organic electroluminescent device Driving voltage, luminous efficiency and lifetime require continuous development of organic electroluminescent functional layer materials with excellent performance

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