Quantum-Dot Layer Patterning With Assisting Layer for High-Resolution QLEDs
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Solution Overview
Problem
Ink-jet printing of Quantum-dot Light Emitting Diodes (QLEDs) faces low efficiency and resolution limitations, leading to issues with quantum-dot film morphology, thickness uniformity, and color mixing due to quantum-dot remaining during patterning, which affects color purity and gamut in display panels.
Innovation Solution
A light emitting device with a non-polar polymer assisting layer reduces quantum-dot adsorption, utilizing a ligand material that changes solubility under illumination to facilitate precise patterning through exposure and development, enabling high-resolution QLEDs by preventing quantum-dot remaining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ink-jet printing is used to fabricate QLEDs, then manufacturing flexibility is improved, but manufacturing precision deteriorates due to low resolution and quantum-dot remaining
Solution Approach 1:
The patent introduces an assisting layer as an intermediary between the substrate and quantum-dot layer. This layer mediates the interaction by providing a surface that prevents quantum-dot adsorption during patterning, thereby enabling high-resolution fabrication while maintaining ink-jet printing flexibility. The assisting layer acts as a mediator that solves the contradiction between manufacturing ease and precision.
Solution Approach 2:
The patent utilizes photo-induced parameter changes in the ligand material. Upon illumination, the ligand material undergoes solubility changes that enable precise patterning control. This parameter change mechanism allows the system to achieve high manufacturing precision through exposure and development processes while retaining the flexibility of ink-jet printing deposition.
2Device complexity
If conventional patterning is used without assisting layer, then device structure is simplified, but quantum-dot remaining occurs affecting color purity
Solution Approach 1:
The assisting layer serves as a mediator that prevents direct adsorption of quantum dots on the substrate during patterning. By introducing this intermediate layer, the patent eliminates quantum-dot remaining that would otherwise compromise color purity, while the layer itself is designed to be thin and functionally integrated to minimize overall device complexity.
3Ease of operation
If quantum-dot layer is made soluble for patterning, then patterning ease is improved, but quantum-dot remaining increases reducing color gamut
Solution Approach 1:
The patent employs periodic action through photo-induced solubility changes. The ligand material transitions from insoluble to soluble state upon illumination, enabling timed dissolution during development. This periodic solubility change allows easy patterning operation while preventing quantum-dot remaining, thereby maintaining color gamut integrity.
Solution Approach 2:
The patent utilizes parameter changes in the ligand material's solubility property. By controlling the solubility parameter through light exposure, the system achieves easy patterning operation where quantum dots dissolve selectively in exposed regions. This parameter control prevents quantum-dot remaining and preserves color gamut while enabling straightforward patterning processes.
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
The solution effectively prevents quantum-dot remaining, enhances color purity, and increases the color gamut of display panels, overcoming resolution limitations of ink-jet printing and enabling high-resolution QLEDs.
Implementation Method 1
a property of the first ligand material changes by an effect of illumination, so that a solubility of the quantum-dot layer in an organic solvent changes
Implementation Method 2
a material of the assisting layer includes a non-polar polymer
Data Source
AI summary
A light emitting device and a fabricating method thereof, and a light emitting apparatus. The light emitting device includes: a substrate, and an assisting layer and a quantum-dot layer that are provided in stack on one side of the substrate, and the assisting layer is close to the substrate; a material of the assisting layer includes a non-polar polymer; and the quantum-dot layer includes quantum dots and a first ligand material coordinated to the quantum dots, and a property of the first ligand material changes by an effect of illumination, so that a solubility of the quantum-dot layer in an organic solvent changes.