QLED Buffer Layer Solvent Compatibility
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Solution Overview
Problem
In quantum dot light emitting diodes (QLEDs), the use of non-polar organic solvents for dissolving quantum dots leads to corrosion of organic material layers, resulting in uneven quantum dot layers and degraded performance due to incompatibility with hole transportation layers.
Innovation Solution
A manufacturing method involving a polar organic solvent buffer layer that dissolves non-polar organic solvents, allowing for the deposition of quantum dots on organic material layers without corrosion, using solvents with boiling points below 200°C, such as alcohols and ethers for the polar solvent and alkanes or aromatic hydrocarbons for the non-polar solvent, and employing inkjet printing for precise layer formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If non-polar organic solvents are used to dissolve quantum dots, then quantum dots can be deposited on the substrate, but the organic material layers are corroded and the quantum dot layers become uneven
Solution Approach 1:
A buffer layer made of polar organic solvent is introduced as an intermediary between the quantum dot solution (non-polar solvent) and the organic material layers. The polar buffer layer dissolves the non-polar solvent through solubility interaction, preventing direct contact between the non-polar solvent and organic material layers, thus eliminating corrosion while enabling uniform quantum dot deposition.
Solution Approach 2:
The invention changes the solvent polarity parameter by using a polar organic solvent for the buffer layer, which is incompatible with the non-polar solvent used for quantum dot dissolution. This parameter change allows the buffer layer to dissolve the non-polar solvent through polarity mismatch, preventing the non-polar solvent from corroding the organic material layers.
2Ease of manufacture
If non-polar organic solvents are used for quantum dot dissolution, then quantum dot solution can be formed, but incompatibility with hole transportation layers occurs leading to degraded performance
Solution Approach 1:
The polar organic solvent buffer layer serves as a mediator that allows the non-polar quantum dot solution to be deposited without directly contacting the hole transportation layer. The buffer layer dissolves the non-polar solvent, preventing it from reaching and degrading the hole transportation layer, thus maintaining device reliability while enabling quantum dot solution formation.
Solution Approach 2:
The buffer layer is formed in advance before depositing the quantum dot solution. This preliminary action creates a protective interface that prevents subsequent corrosion of the organic material layers, ensuring device performance is not degraded by the necessary use of non-polar solvents for quantum dot dissolution.
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 ensures even deposition of quantum dot layers, improves the interface between film layers, and enhances the performance of QLEDs by preventing corrosion and maintaining structural integrity during the manufacturing process.
Implementation Method 1
the polar organic solvent and the non-polar organic solvent are capable of dissolving each other
Implementation Method 2
removing the polar organic solvent and the non-polar organic solvent to form the quantum dot layer
Data Source
AI summary
A quantum dot light emitting diode, a display apparatus, and a manufacturing method are provided. The manufacturing method includes forming a first electrode, a first functional layer, a buffer layer, a quantum dot layer, a second functional layer and a second electrode on a base substrate sequentially, wherein the first functional layer is made from organic material, a material for the buffer layer includes a polar organic solvent, and forming the quantum dot layer includes forming a solution including quantum dots and a non-polar organic solvent above the buffer layer using inkjet printing method, the non-polar organic solvent and the polar organic solvent are capable of dissolving each other; and removing the polar organic solvent and the non-polar organic solvent to form the quantum dot layer.