QLED Quantum Dot Layer Infiltration for Structural Alignment
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Solution Overview
Problem
Current QLED devices have low efficiency due to defects in the quantum dot light emitting layer, leading to uneven surfaces and internal gaps that trap carriers and prevent light emission, with existing methods focusing primarily on surface regularity rather than internal structure alignment.
Innovation Solution
A method involving the infiltration of a mixed solvent containing bifunctional molecules into the quantum dot layer to form bridges between loose quantum dots, improving the compactness and regularity of both the surface and internal structure, using a combination of temperature control, rotation, and annealing to enhance solubility and diffusion without damaging the layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to form the quantum dot layer, then the surface regularity is improved, but the internal structure alignment remains poor leading to low device efficiency
Solution Approach 1:
The patent introduces a mixed solvent containing bifunctional molecules as an intermediary substance that penetrates into the quantum dot layer. The bifunctional molecules act as mediators that simultaneously interact with multiple quantum dots, forming molecular bridges that align internal structures while maintaining surface regularity, thereby resolving the contradiction between surface quality and internal structure alignment
Solution Approach 2:
The patent changes the chemical and physical parameters of the quantum dot layer by introducing bifunctional molecules through mixed solvent infiltration. This alters the molecular arrangement and bonding characteristics within the layer, transforming the internal structure from disordered to aligned state, which improves carrier transport and device efficiency without compromising surface regularity
2Ease of manufacture
If the quantum dot layer is formed without bifunctional molecules, then the manufacturing process is simpler, but internal gaps trap carriers preventing light emission
Solution Approach 1:
The bifunctional molecules in the mixed solvent serve as intermediary agents that fill internal gaps and connect quantum dots through molecular bridging. This intermediary substance enables effective carrier transport pathways without significantly complicating the manufacturing process, as the infiltration can be performed in existing fabrication sequences
Solution Approach 2:
The patent creates a composite structure within the quantum dot layer by combining quantum dots with bifunctional molecules. This composite arrangement eliminates internal gaps and creates continuous pathways for carrier transport, improving reliability while maintaining manufacturing feasibility through solvent-based infiltration
3Ease of manufacture
If the quantum dot layer has loose structure, then the material deposition is easier, but the surface is uneven and internal gaps trap carriers
Solution Approach 1:
The patent applies parameter changes by introducing bifunctional molecules that alter the structural parameters of the quantum dot layer. These molecules induce reorganization of quantum dots from loose to compact arrangement, improving surface uniformity and eliminating internal gaps while maintaining ease of deposition through solvent-based processing
Solution Approach 2:
The mixed solvent with bifunctional molecules acts as an intermediary that facilitates structural reorganization during or after deposition. The bifunctional molecules mediate the transition from loose to compact structure by forming bridges between quantum dots, achieving structural uniformity without requiring complex deposition techniques
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 approach enhances the quantum efficiency and spectral characteristics of QLED devices by ensuring a more compact and regular quantum dot arrangement, allowing for improved carrier transport and light emission.
Implementation Method 1
infiltrating a mixed solvent containing a bifunctional molecule into the quantum dot layer
Implementation Method 2
infiltrating a mixed solvent containing a bifunctional molecule into the quantum dot layer
Implementation Method 3
raising temperature to a predetermined value
Implementation Method 4
raising temperature to a predetermined value
Implementation Method 5
Quantum dots have a quantum confinement effect and emit fluorescence when excited
Implementation Method 6
emit fluorescence when excited
Implementation Method 7
performing an annealing process on the quantum dot layer
Implementation Method 8
performing an annealing process on the quantum dot layer
Data Source
AI summary
A QLED device and manufacturing method thereof, a QLED display panel and a QLED display device are disclosed which improve the surface and internal structure of the quantum dot layer in the QLED devices. The method for manufacturing a QLED device includes forming a first electrode layer; forming a quantum dot layer on the first electrode layer; infiltrating a mixed solvent containing a bifunctional molecule into the quantum dot layer so as to improve the structure of the quantum dot layer; and forming a second electrode layer on the quantum dot layer.