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Ink for ink-jet printing of organic light-emitting layer, preparation method and applications thereof

An organic light-emitting layer, inkjet printing technology, applied in the application, ink, household appliances and other directions, to achieve the effect of large uniformity of film formation, simple preparation method and stable ink discharge state

Inactive Publication Date: 2020-02-14
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using the inkjet printing process to prepare the organic light-emitting layer, how to choose a suitable solvent to meet the solubility of multi-component solutes and formulate inks that meet the process requirements of inkjet printing is still facing great challenges.

Method used

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  • Ink for ink-jet printing of organic light-emitting layer, preparation method and applications thereof
  • Ink for ink-jet printing of organic light-emitting layer, preparation method and applications thereof
  • Ink for ink-jet printing of organic light-emitting layer, preparation method and applications thereof

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preparation example Construction

[0039] The present invention also provides the preparation method of above-mentioned ink, it refers to following steps:

[0040] In step S1, the mixed host luminescent material, the doped phosphorescent luminescent material and the viscosity regulator are mixed and dispersed, and heated and stirred at 55° C. to 65° C. to obtain a mixed precursor.

[0041] Preferably, it also includes mixing, dispersing and thermally stirring the organic solvent to obtain a mixed precursor.

[0042] Generally speaking, it is preferable to use a frequency of about 99 kHz for ultrasonic dispersion, and the control time is 10 min to 20 min; and the thermal stirring time is controlled to 0.5 h to 1 h.

[0043] It is worth noting that in the above mixing and dispersing process, ultrasonic dispersion and thermal stirring can be carried out without the five raw materials being completely mixed. According to the properties of specific raw materials, all mixing and dispersing and thermal stirring or ste...

Embodiment 1

[0054] First, weigh 27mg m-MTDATA, 27mg TPBi and 6mg Ir(mppy) 3 Put it in a 4mL reagent bottle, measure 2mL of butyl benzoate and 0.4mL~0.5mL of toluene into the reagent bottle, first ultrasonicate at a frequency of 99kHz for 10min~15min to completely disperse the solute in the solvent, and then dissolve the solute at 55°C Heat and stir at ~65°C for 0.4h to 0.6h to make the solute (i.e. mixed host material m-MTDATA and TPBi and doped phosphorescent material Ir(mppy) 3 ) is completely dissolved to obtain a mixed precursor.

[0055] Then, the above-mentioned mixed precursor was filtered with a 0.2 μm filter head to obtain an ink.

[0056] In the obtained ink, its solid content is 24mg / mL~25mg / mL, the concentration of the mixed host material is 21.6mg / mL~22.5mg / mL, and the hole transport material m-MTDATA and the electron transport material TPBi The mass ratio is 1:1, doped with phosphorescent material Ir(mppy) 3 The doping ratio is 10% (that is, the total mass of the mixed ho...

Embodiment 2

[0060] First, weigh 150mg of MCP and place it in a 6mL reagent bottle A, measure 5mL of benzyl benzoate into the reagent bottle A, and sonicate at a frequency of 99kHz for 15min to 20min to obtain a clear solution A of 29mg / mL to 30mg / mL . Another weighed 150mg of Bphen was placed in a 6mL reagent bottle B, and 5mL of benzyl benzoate and 0.02mL of chlorobenzene were added to the reagent bottle B, and ultrasonicated at a frequency of 99kHz for 15min to 20min to obtain 29mg / mL to 30mg / mL Clarify solution B. Another weighed 60mg Ir(bt) 2 (acac) was placed in a 4mL reagent bottle C, 2mL benzyl benzoate and 0.02mL chlorobenzene were added to the reagent bottle C, and ultrasonication was performed at a frequency of 99kHz for 15min to 20min to obtain a clarification of 29mg / mL to 30mg / mL Solution C.

[0061] Again, measure solutions A, B and C in a volume ratio of 2:2:1 and place them in reagent bottle D, heat and stir at 55°C to 65°C for 0.5h to 1h; mix solutions A, B and C is u...

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Abstract

The invention discloses ink for ink-jet printing of an organic light-emitting layer, wherein the ink is formed by uniformly mixing a mixed main body light-emitting material, a doped phosphorescent light-emitting material and a viscosity regulator, the mixed main body light-emitting material comprises a hole transport material and an electron transport material, the hole transport material and theelectron transport material are matched with carrier transport, and the triplet state energy levels of the hole transport material and the electron transport material are at least 0.1 eV higher than the triplet state energy level of the doped phosphorescent light-emitting material. The invention further discloses a preparation method of the ink and applications of the ink in manufacturing of organic light emitting diodes. According to the invention, the ink for ink-jet printing of an organic light-emitting layer is obtained through a simple process by mixing the hole transport material and theelectron transport material matched with carrier transport as the mixed main body light-emitting material, selecting the guest light-emitting material with the specific triplet state energy level performance and limiting the viscosity regulator and the organic solvent, so that the preparation method is simple, and the process requirement of ink-jet printing can be met.

Description

technical field [0001] The invention belongs to the technical field of organic light-emitting diode production, and specifically relates to an ink for inkjet printing of an organic light-emitting layer, a preparation method thereof, and an application of the ink in the production of organic light-emitting diodes. Background technique [0002] Organic light-emitting diode (OLED) has become the mainstream technology in the third-generation display technology because of its advantages such as fast response, flexible display, low temperature resistance, small size, high efficiency, low driving voltage, and easy realization of large-area device fabrication. A typical OLED structure generally includes an anode, a hole injection (transport) layer, an organic light-emitting layer, an electron transport (injection) layer, and a cathode; wherein, for the preparation of an OLED organic light-emitting layer, a phosphorescent material is usually doped as a guest in a host material In thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/38C09D11/36C09D11/32C09D11/50C09D11/52
CPCC09D11/32C09D11/36C09D11/38C09D11/50C09D11/52
Inventor 孙玉玲张东煜林通牟婉莹崔铮
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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