Quantum Dot Emissive Layer with Polymer Alignment for Flex Stability
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Solution Overview
Problem
Existing quantum dot light emitting devices face challenges in meeting the mechanical stability and performance requirements during stretching and bending processes, leading to potential damage or cracking of the quantum dot layer.
Innovation Solution
Incorporating a polymer alignment layer with aligned main chains and ligand groups connected to quantum dots through coordination bonds, enhancing the mechanical properties and stability of the quantum dot layer by ensuring ordered alignment and chemical bonding with electrodes and carrier transport layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional quantum dot layer is used without polymer alignment layer, then the device structure is simpler, but the quantum dot layer is prone to damage and cracking during stretching and bending
Solution Approach 1:
The patent creates a composite structure by integrating the polymer alignment layer with the quantum dot layer through coordination bonds between ligand groups and quantum dots. This composite approach enhances the mechanical stability of the quantum dot layer during stretching and bending while maintaining a relatively streamlined device architecture.
Solution Approach 2:
The polymer alignment layer acts as an intermediary between the quantum dot layer and the electrodes/carrier transport layers. It provides mechanical support and stability to the quantum dot layer during deformation, preventing direct stress concentration that would cause cracking, while still allowing for efficient charge transport and optical performance.
2Strength
If the polymer alignment layer is added to stabilize the quantum dot layer, then the mechanical properties improve, but the manufacturing process becomes more complex
Solution Approach 1:
The patent combines the alignment function and the mechanical support function into a single polymer alignment layer. This layer simultaneously provides molecular alignment for optimal optical properties and mechanical reinforcement for the quantum dot layer, reducing the need for additional separate functional layers and simplifying the overall manufacturing process despite the enhanced functionality.
3Stability of the object's composition
If ligand groups are connected to quantum dots through coordination bonds, then the stability and mechanical properties improve, but the chemical complexity increases
Solution Approach 1:
The patent utilizes coordination bonds between ligand groups and quantum dots, which represent a specific type of chemical interaction with appropriate bond strength and stability characteristics. This chemical bonding approach provides stable integration of the polymer alignment layer with the quantum dot layer, enhancing compositional stability without requiring overly complex chemical structures.
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 polymer alignment layer stabilizes the quantum dot layer, preventing damage during stretching and bending, thereby improving the mechanical properties and light emitting performance of the device.
Implementation Method 1
a ligand group connected to quantum dots in the quantum dot layer through a coordination bond
Data Source
AI summary
The present disclosure provides a light emitting device and a method for preparing the same, a display panel and a display device. The light emitting device includes: a base substrate; a first electrode, a light emitting layer and a second electrode stacked on the base substrate in sequence; the light emitting layer includes a polymer alignment layer and a quantum dot layer arranged adjacently, the polymer alignment layer having main chains, at least parts of which have a same length direction in the polymer alignment layer, and a ligand group connected to quantum dots in the quantum dot layer through a coordination bond.