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Ink for making buffer layer, preparation method and application

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

Active Publication Date: 2017-07-14
SHANGHAI MI FANG ELECTRONICS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Ink for making buffer layer, preparation method and application

Examples

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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 invention relates to ink for making a buffer layer of a flexible organic luminous electrochemical cell, a preparation method of the ink and the buffer layer made by using the ink. The ink for making the buffer layer of the flexible organic luminous electrochemical cell comprises poly(vinyl cinnamate), poly(9,9-dioctylfluorene), a polymer additive and an organic solvent, wherein the concentration of the poly(vinyl cinnamate) in the ink is 5-40mg / mL; the concentration of the poly(9,9-dioctylfluorene) is 0.5-5mg / mL; and the polymer additive accounts for 1-10wt% of weight of the ink. The ink can be used for printing the buffer layer between a luminous layer and a cathode; the buffer layer is capable of blocking penetration of silver ink and transmitting electrons, so that ink-jet printing of the cathode is achieved and free patterning luminescence is achieved in the absence of a mask.

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 Applications(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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