Preparation method of TADF multicolor OLED device

Abstract

The invention discloses a preparation method of a TADF multicolor OLED device. The method comprises the following steps: S1, preparing a light emitting layer solution: weighing a certain amount of 4CzIPN and DMAC-DPS samples, and preparing 4mg / mL solutions by using chloroform as a solvent; measuring out the two solutions by using a micropipettor, mixing the two solutions, stirring the mixed solution for a certain time to make the mixed solution uniform, and obtaining mixed solutions with different volume ratios; S2, cleaning ITO glass; S3, spin-coating the ITO glass with a light emitting layer; and S4, transferring an ITO substrate to a vacuum chamber, vapor-plating a layer of TPBI as an electron transport layer, then vapor-plating Ca, and finally, vapor-plating Ag as an electrode. The method has high light quantum yield. No host material is used, and cost is saved. Because of the adoption of a common low-toxicity organic solvent, the pollution and the harm to the environment are reduced, and the preparation process is green and environment-friendly.

Description

technical field [0001] The invention relates to a preparation method of a TADF type multicolor OLED device, which can be used in the technical field of preparation of organic electroluminescent devices. Background technique [0002] OLED (Organic Lighting Emitting Diodes, Organic Light Emitting Diodes), due to its high brightness, fast response, wide viewing angle, low power consumption, strong flexibility, high cold resistance and easy preparation of large-area flexible devices, is widely used in the fields of flat panel displays and solid-state lighting. It has great application prospect. Solution processing of OLED devices has attracted widespread attention because of its low preparation cost and easy large-scale production. Thermally active delayed fluorescence (TADF) materials have a small singlet-triplet energy level difference (ΔE ST ), so the triplet excitons can be transformed into singlet excitons by reverse intersystem crossing (RISC), so that the internal quant...

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Problems solved by technology

Yang's research group used m-MTDATA and 3TPYMB as exciplex emitters to adjust the thickness of the electron transport layer 3TPYMB. Due to the microcavity effect between the cathode and anode and the thicker ETL will block the hole carriers in the light-emitting layer Thereby increasing the space charge density in the light-emitting layer, so that the EL spectrum redshifts with the increase of the ETL thickness, and obtains a small range of 20nm toning, but its luminescence spectrum is unstable (Huang Q, Zhao S, Xu Z.Applied Physics Letters , 2014, 104(16): 4802-4806.)

[0006] From the above analysis, it can be seen that the existing color toning methods either change the molecular structure or regulate the device structure, and it is difficult to obtain a wide range of regulation and single pure color emission, which cannot meet the requirements of industrialization

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