Blue light tadf material and its preparation method and electroluminescent device

Abstract

The invention provides a blue light TADF material, a preparation method thereof and an electroluminescent device. The blue light TADF material connects an alkyl chain that can increase solubility on the periphery, and connects a tert-butyl carbazole unit with a high energy level at the end of the alkyl chain. While obtaining high luminous efficiency and TADF efficiency, it also realizes the material Good solubility enables the material to be processed by solution spin coating, and the carbazole at the end can act as a host, enabling the non-doping of the light-emitting layer while effectively avoiding phase separation.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a blue light TADF material, a preparation method thereof and an electroluminescent device. Background technique [0002] Organic light-emitting diodes (organic light-emitting diodes, OLED) display device does not need a backlight source for its active light emission, high luminous efficiency, large viewing angle, fast response speed, wide temperature range, relatively simple production and processing technology, and easy to drive. The advantages of low voltage, low energy consumption, lighter and thinner, flexible display and huge application prospects have attracted the attention of many researchers. [0003] Existing OLED display devices generally include: a substrate, an anode disposed on the substrate, an organic light-emitting layer disposed on the anode, an electron transport layer disposed on the organic light-emitting layer, and a cathode disposed on the electron transpo...

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Problems solved by technology

At present, TADF materials that meet the above conditions are still relatively scarce compared with heavy metal Ir complexes. In the field of blue light where phosphorescent heavy metal materials need to be broken through, there are very few TADF materials. At the same time, most TADF materials are obtained through It is processed by vacuum evaporation, which is complex, requires high energy, and has low material utilization, which greatly limits the application of TADF materials.

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