Dark blue light thermally activated delayed fluorescence material and application thereof

Abstract

The invention provides a dark blue light thermally activated delayed fluorescence (TADF) material. Compound molecules formed by the dark blue light thermally activated delayed fluorescence material have ultra-high reverse intersystem crossing rate, when the dark blue light thermally activated delayed fluorescence material which serves as a main body is doped into a luminous layer in an electroluminescent device, blue fluorescence and phosphorescence electroluminescent devices which take the dark blue light thermally activated delayed fluorescence material as a main body material have quite high efficiency.

Description

technical field [0001] The invention relates to the field of materials that can be used in flat-panel display devices, in particular, a deep blue light thermally activated delayed fluorescent material and a preparation method thereof. Background technique [0002] It is known that organic light-emitting diodes (organic light-emitting diodes, OLEDs) do not require a backlight source for their active light emission, high luminous efficiency, large viewing angle, fast response speed, wide temperature range, and relatively simple production and processing technology. The advantages of low driving voltage, low energy consumption, lighter and thinner, flexible display and huge application prospects have attracted the attention of many researchers. In OLEDs, however, the dominant luminescent guest material is crucial. [0003] The luminescent guest materials used in early OLEDs are fluorescent materials. Since the ratio of singlet and triplet excitons in OLEDs is 1:3, the theoreti...

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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, especially in the field of deep blue light where phosphorescent heavy metal materials need to be broken through, there are very few TADF materials.

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