Photodegradable Dispersant Ink for Aligned Micro-LED Deposition
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Solution Overview
Problem
Conventional inorganic light emitting diodes face challenges in manufacturing due to the difficulty in removing dispersants used to align light emitting elements, which can act as foreign matter and affect display device performance, especially at high temperatures.
Innovation Solution
A light emitting element dispersant with photodegradable functional groups is used, which decomposes upon light irradiation, allowing for low-temperature heat treatment to remove the dispersant fragments and solvent, facilitating the manufacturing of display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional dispersants are used to align light emitting elements, then the light emitting elements can be properly aligned, but the dispersants cannot be completely removed and act as foreign matter affecting display device performance
Solution Approach 1:
The dispersant molecule is segmented into two parts: a base structure that performs the alignment function and a photodegradable functional group that can be decomposed. This segmentation allows the dispersant to fulfill its alignment purpose while leaving no harmful residue, as the photodegradable group breaks down into volatile fragments upon light irradiation.
Solution Approach 2:
The chemical structure of the dispersant is modified by incorporating photodegradable functional groups (such as carbonyl groups) that change their properties upon light irradiation. This parameter change enables the dispersant to transition from a stable alignment-agent to a decomposable substance that volatilizes completely, eliminating foreign matter issues.
2Loss of substance
If high temperature heat treatment is used to remove dispersant, then the dispersant can be removed, but the organic light emitting material degrades and inorganic light emitting elements require excessively high temperatures
Solution Approach 1:
The dispersant is designed with photodegradable functional groups that have specific bond energies allowing decomposition at lower temperatures (100-200°C) when irradiated with light. This parameter change in the dispersant's chemical structure enables removal at temperatures that do not degrade organic light emitting materials or damage inorganic elements.
Solution Approach 2:
The thermal removal mechanism is replaced with a photochemical decomposition mechanism. Instead of relying solely on heat to volatilize the dispersant (which requires high temperatures), light irradiation triggers photodecomposition of the dispersant bonds, enabling removal at lower temperatures through chemical bond breaking rather than thermal vaporization.
3Ease of manufacture
If photodegradable functional groups are incorporated in the dispersant, then the dispersant can be decomposed by light irradiation, but the dispersant structure becomes more complex
Solution Approach 1:
The dispersant structure incorporates photodegradable functional groups (such as carbonyl groups with C=O bonds) that have specific photophysical properties. These groups are strategically placed in the molecular structure to enable photodecomposition while maintaining the dispersant's primary alignment function, balancing structural complexity with manufacturing benefits.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables efficient removal of dispersant fragments at lower temperatures, improving the manufacturing process and reducing defects in display devices by ensuring proper alignment and removal of light emitting elements.
Implementation Method 1
a light emitting element dispersant with photodegradable functional groups is used, which decomposes upon light irradiation
Implementation Method 2
removing the solvent and the dispersant fragment of the ink... heat-treating the ink sprayed on target substrate to volatilize the solvent and the dispersant fragment
Data Source
AI summary
The invention relates to a light-emitting element dispersing agent; a light-emitting element ink comprising the same; and a method for producing a display device. This method for producing a display device may comprise spraying an ink including a solvent, light emitting elements, and a light emitting element dispersant onto a target substrate provided with a first electrode and a second electrode, applying a voltage to the first electrode and the second electrode to generate an electric field on the target substrate, irradiating the ink sprayed on the target substrate with light to form a dispersant fragment in which the light emitting element dispersant is decomposed, and removing the solvent and the dispersant fragment of the ink.