Inkjet ink composition

The inkjet ink composition with specific solvents stabilizes metal oxide nanoparticles, addressing printability issues and improving the performance of functional layers in display devices by ensuring uniform dispersion and enhanced printability.

WO2026048662A1 Publication Date: 2026-03-05TOPPAN HOLDINGS INC
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Patent Information

Application Number
PCT/JP2025/029414
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-08-28
Filing Date
2025-08-21
Publication Date
2026-03-05

AI Technical Summary

Technical Problem

Existing inkjet printing methods for forming layers in organic electroluminescent elements and quantum dot light-emitting diodes, such as electron transport and hole injection layers, face challenges in achieving optimal performance and stability due to the use of conventional solvents that affect the dispersion and printability of metal oxide nanoparticles.

Method used

An inkjet ink composition comprising metal oxide nanoparticles, a glycol-based solvent, and a non-alcohol-based solvent with a Hansen solubility parameter (δH) of 8 or more, which maintains dispersion stability and inkjet printability, is used to form functional layers like hole injection, hole transport, and electron transport layers.

Benefits of technology

The inkjet ink composition ensures uniform dispersion and excellent printability of metal oxide nanoparticles, resulting in improved performance of light-emitting devices with layers between the cathode and anode, enhancing the efficiency and stability of the display device.

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Abstract

Provided is a technique capable of contributing to performance improvement of a light-emitting element having a layer composed of metal oxide nanoparticles and disposed between a cathode and an anode. More specifically, an inkjet ink composition according to the present embodiment contains: metal oxide nanoparticles comprising a material selected from the group consisting of a hole injection material, a hole transport material, and an electron transport material; and a dispersion medium containing a glycol-based solvent and a non-alcohol-based solvent having a Hansen solubility parameter with a hydrogen bond term δH of 8 or more.
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