Quantum Dots Light-Emitting Diode Inkjet Printing in Active Gas Atmosphere
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Solution Overview
Problem
The efficiency of quantum dot light-emitting diode devices and ink printability often struggle to be balanced during inkjet printing of the quantum dots light-emitting layer, with devices having better printability typically exhibiting low efficiency.
Innovation Solution
Preparing the quantum dots light-emitting layer in an inert atmosphere containing active gases such as saturated and unsaturated fatty acids, esters, and organic bases, which improves the device efficiency while maintaining printability, by adjusting the molar percentage and temperature conditions during inkjet printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If inkjet printing technology is used to prepare quantum dots light-emitting layer with good printability, then the printability is improved, but the device efficiency becomes low
Solution Approach 1:
The patent applies inert atmosphere by introducing active gas (oxygen or ozone) during the inkjet printing process to treat the quantum dots light-emitting layer. This treatment in a controlled gas environment improves the device efficiency by enhancing the optical properties and stability of quantum dots, while maintaining the inkjet printing process for good printability. The active gas treatment resolves the contradiction by adding a post-processing step that boosts efficiency without compromising the printing capability.
2Ease of operation
If quantum dots ink is optimized for better printability, then the printability is improved, but the external quantum efficiency decreases
Solution Approach 1:
The patent applies parameter changes by introducing active gas (oxygen or ozone) treatment as a post-processing step to modify the quantum dots light-emitting layer. This treatment changes the optical and electrical parameters of the quantum dots, improving the external quantum efficiency. The ink formulation itself remains optimized for printability, while the gas treatment enhances the efficiency, thus resolving the contradiction through parameter modification after printing.
3Reliability
If active gas concentration is increased to improve device efficiency, then the external quantum efficiency is improved, but the inkjet printing process becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-establishing the inert atmosphere environment with controlled active gas concentration before initiating the inkjet printing process. The active gas treatment is integrated as a standard step in the printing workflow, with predetermined gas concentrations and exposure times. This approach simplifies the overall process complexity by making the efficiency enhancement a routine, controlled step rather than a variable parameter requiring complex adjustments during printing.
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 enhances the external quantum efficiency and light-emitting performance of quantum dot light-emitting diodes, ensuring both high efficiency and good printability, as demonstrated by increased external quantum efficiency and extended device lifetimes.
Implementation Method 1
placing the base plate into an inert atmosphere containing active gas, and printing quantum dots ink on a surface of the base plate to prepare a quantum dots light-emitting layer
Data Source
AI summary
The present application discloses a method for preparing quantum dots light-emitting diode, including the following step: providing a base plate, placing the base plate into an inert atmosphere containing active gas, and printing quantum dots ink on a surface of the base plate to prepare a quantum dots light-emitting layer. The method for preparing the quantum dots light-emitting diode provided in the present application changes the film-forming atmosphere of inkjet printing, and prepares the quantum dots light-emitting layer in the inert atmosphere containing active gas, which can improve the device efficiency of the quantum dots light-emitting diode while ensuring the printability of quantum dots ink.