A kind of ink for making buffer layer, preparation method and application

A buffer layer and ink technology, applied in applications, inks, household appliances, etc., can solve problems such as leakage and penetration of devices

Active Publication Date: 2020-06-12
SHANGHAI MI FANG ELECTRONICS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The preparation process of organic light-emitting electrochemical cells (OLEC) is relatively simple. The light-emitting layer is generally prepared by spin-coating process, while the electrode is still prepared by vacuum evaporation process. Currently, the commercialized silver inks are mainly water-based or alcohol-based inks. The emissive layer in organic light-emitting electrochemical cells causes dissolution or infiltration, resulting in device leakage, especially for transition metal complexes as emissive layer devices

Method used

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  • A kind of ink for making buffer layer, preparation method and application

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preparation example Construction

[0030] The second aspect of the present disclosure provides a method for preparing an ink for making a buffer layer of a flexible organic light-emitting electrochemical cell, including: poly(vinyl cinnamate), poly(9,9-dioctylfluorene) and The polymer additive is mixed with an organic solvent to obtain an ink; wherein, the concentration of poly(vinyl cinnamate) in the ink is 5-40 mg / mL, and the concentration of poly(9,9-dioctylfluorene) is 0.5-5 mg / mL, the weight ratio of the polymer additive to the ink is 1-10% by weight; preferably, the concentration of poly(vinyl cinnamate) in the ink is 10-20mg / mL, poly(9,9 The concentration of -dioctylfluorene) is 1-3mg / mL, the weight ratio of the polymer additive to the ink is 3-6% by weight, and the weight average molecular weight of the polymer additive is 10000-50000.

[0031] According to the second aspect of the present disclosure, the organic solvent is used to dissolve poly(vinyl cinnamate), poly(9,9-dioctylfluorene) and polymer a...

Embodiment 1

[0044] Weigh 20 mg of poly(vinyl cinnamate) and 2 mg of poly(9,9-dioctylfluorene) and transfer to a reagent bottle, add 1 mL of toluene, add 2 wt% ink weight of polystyrene, and magnetically stir for 1 hour , ultrasonicated at 40kHz for 5min, and then filtered with a 0.22μm filter head to obtain ink. The specific composition is shown in Table 1.

[0045] Put the ink into the ink cartridge, and use the inkjet printer to stably eject the ink film. After UV cross-linking, a dense cross-linked film can be formed, which can prevent the penetration of the upper ink. The specific performance of the ink is shown in Table 2. Using this The buffer layer made of ink can meet the standard of use, which can block the penetration of silver ink and transmit electrons.

Embodiment 2-6

[0047] The preparation steps of Example 2-6 are basically the same as in Example 1. The specific composition is shown in Table 1, and the specific performance of the ink is shown in Table 2. The buffer layer made by the ink prepared in Example 2-6 can reach the use standard, and can block The penetration of the silver ink can in turn transport electrons.

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Abstract

The present disclosure relates to an ink for making a buffer layer of a flexible organic light-emitting electrochemical cell, its preparation method and application, and the buffer layer prepared with the ink. The ink used for making a buffer layer of a flexible organic light-emitting electrochemical cell includes: (vinyl cinnamate), poly(9,9-dioctyl fluorene), polymer additive and organic solvent; wherein, the concentration of poly(vinyl cinnamate) in the ink is 5-40mg / mL, poly( 9,9-dioctylfluorene) concentration is 0.5-5mg / mL, and the weight ratio of the polymer additive to the ink is 1-10% by weight. The ink of the present disclosure can be used to print a layer of buffer layer between the light-emitting layer and the cathode, the buffer layer can not only block the penetration of silver ink but also transmit electrons, so as to realize the inkjet printing of the cathode, in the case of no mask Free patterned luminescence can be achieved.

Description

technical field [0001] The disclosure relates to the technical field of organic light-emitting electrochemical cells, and in particular, relates to an ink for making a buffer layer of a flexible organic light-emitting electrochemical cell, its preparation method and application, and the buffer layer prepared with the ink. Background technique [0002] In recent years, there have been extensive studies on the preparation of organic light-emitting thin film devices by the full solution method. Compared with the traditional evaporation method, it has the advantages of rapidity, energy saving, and high material utilization. At present, most of the researches on the preparation of devices by the solution method are single-layer or multi-layer preparation using the solution method, and the preparation of the whole solution cannot be realized. One of the most critical problems in the preparation of the whole solution is the mutual dissolution and penetration of the solutions of each...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D11/30C09D11/36C09D11/106C09D11/107C09D11/102C09D11/033H01L51/50H01L51/54H01L51/56
CPCC09D11/033C09D11/102C09D11/106C09D11/107C09D11/30C09D11/36H10K71/13H10K85/10H10K85/111H10K50/135H10K50/16H10K71/00
Inventor 李胜夏
Owner SHANGHAI MI FANG ELECTRONICS LTD
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