A deep blue light thermally cross-linked thermally activated delayed fluorescent material and its preparation method and application

A technology of thermally activated delay and fluorescent materials, which is applied in the fields of luminescent materials, chemical instruments and methods, semiconductor/solid-state device manufacturing, etc., can solve the problem of less deep blue TADF polymer materials, and achieve simplified device manufacturing process and solvent resistance Strong, good film-forming performance

Active Publication Date: 2022-07-19
山西穿越光电科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is worth noting that most of the published TADF polymer materials currently have emission wavelengths in the range of 470-610 nm, which is very important for the development of deep blue TADF polymer materials.

Method used

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  • A deep blue light thermally cross-linked thermally activated delayed fluorescent material and its preparation method and application
  • A deep blue light thermally cross-linked thermally activated delayed fluorescent material and its preparation method and application
  • A deep blue light thermally cross-linked thermally activated delayed fluorescent material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The deep blue light thermally cross-linked thermally activated delayed fluorescent material molecule was prepared, and its structural formula is:

[0037] .

[0038] The synthesis method is:

[0039](1) At room temperature, add 3-methoxycarbazole (2 g, 10.07 mmol) to 20 mL of anhydrous tetrahydrofuran, stir to dissolve, and slowly add sodium hydride (0.28 g, 12 mmol). After 30 minutes of reaction, 3,6-difluorobenzonitrile (0.56g, 4.0 mmol) was added, the reaction was carried out under nitrogen protection, the temperature was 60 °C, and the reaction time was 24 hours. After the reaction, the crude product passed through the column layer. Purification by analytical method (the eluent is a mixed solution of petroleum ether and dichloromethane) to obtain the product: 2,6-bis(3-methoxy-9hydro-carbazolyl-9-yl)benzonitrile, yield 88 %.

[0040] (2) Take 2,6-bis(3-methoxy-9hydro-carbazolyl-9-yl)benzonitrile (1.50 g, 3.04 mmol) from step (1), add it to 20 mL of chloroform a...

Embodiment 2

[0058] In this embodiment, the deep blue light thermally cross-linked thermally activated delayed fluorescent material and the preparation method and application thereof are the same as those in Example 1, the difference is that the deep blue thermally crosslinked thermally activated delayed fluorescent material is used in the preparation of full-wet deep blue organic light-emitting In the case of diodes, the thermal crosslinking temperature in step 3 was changed to 120°C.

[0059] The resulting device performance is as follows: turn-on voltage of 5.0 V and maximum brightness of 2445 cd / m 2 , The maximum emission wavelength of the electro-spectrum is 447 nm, and the maximum external quantum efficiency is 6.5%.

Embodiment 3

[0061] In this embodiment, the deep blue light thermally cross-linked thermally activated delayed fluorescent material and the preparation method and application thereof are the same as those in Example 1, the difference is that the deep blue thermally crosslinked thermally activated delayed fluorescent material is used in the preparation of full-wet deep blue organic light-emitting In the case of diodes, the thermal crosslinking temperature in step 3 was changed to 200°C.

[0062] The resulting device performance is as follows: turn-on voltage of 5.6 V and maximum brightness of 1188 cd / m 2 , The maximum emission wavelength of the electro-spectrum is 448 nm, and the maximum external quantum efficiency is 2.5%.

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Abstract

A deep blue light thermally cross-linked thermally activated delayed fluorescent material and a preparation method and application thereof belong to the fields of organic optoelectronic materials and organic light-emitting diode devices. The deep blue light thermally cross-linked thermally activated delayed fluorescent material of the present invention is DV-2CzBN, and its structural formula is: The preparation method of the invention is simple, the temperature of the prepared material to be thermally cross-linked to form the polymer is low, and the thermally-crosslinked polymer film has the advantages of good film-forming performance, good stability and strong resistance to solvent erosion, etc., which is convenient for further electron transport. The spin coating of the material improves the utilization rate of the material and reduces the cost of device fabrication. The fully wet organic light emitting diode device based on the material has an electrospectral wavelength of 448 nm and an external quantum efficiency of up to 7.8%.

Description

technical field [0001] The invention relates to the field of organic optoelectronic materials and organic light-emitting diode devices, in particular to a deep blue light thermally cross-linked thermally activated delayed fluorescent material and a preparation method and application thereof. Background technique [0002] Thermally activated delayed fluorescence (TADF) materials have become the latest generation of fluorescent materials in the application of organic light-emitting diodes (OLEDs) because they do not contain noble metals and can capture singlet and triplet excitons to achieve 100% theoretical internal quantum efficiency. Up to now, a large number of highly efficient vapor-deposited OLEDs based on TADF small-molecule materials have been reported. Especially in view of the high cost, strong toxicity and poor luminescence stability of deep blue phosphorescent materials, researchers have made great efforts to develop new deep blue TADF materials and achieved good r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D209/88C09K11/06H01L51/50H01L51/54H01L51/56
CPCC07D209/88C09K11/06C09K2211/1007C09K2211/1029H10K85/1135H10K85/654H10K85/6572H10K50/11H10K71/00
Inventor 孙开涌周璐瑶滕玉玲蔡超逸邹永斌蔡照胜
Owner 山西穿越光电科技有限责任公司
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