Electroluminescent Ink Nozzle Clogging Prevention
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Solution Overview
Problem
Inkjet printing devices face challenges with nozzle clogging due to the high requirements for ink physical parameters, such as boiling point, viscosity, and surface tension, which are difficult to maintain without additives that negatively impact photoelectric performance.
Innovation Solution
An electroluminescent material ink comprising a quantum dot material, an organic light emitting material, and an organic solvent with a specific alkyl substituted tetrahydronaphthalene formula, which ensures suitable boiling point, viscosity, and surface tension, preventing nozzle clogging and allowing complete solvent evaporation, thereby maintaining film performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymer additives are added to control ink physical parameters, then nozzle clogging is prevented, but charge transport capability is reduced and photoelectric performance deteriorates
Solution Approach 1:
The patent removes polymer additives from the ink formulation entirely, extracting the harmful insulating component while maintaining nozzle performance through alternative means (optimized solvent composition and physical parameters without additives)
Solution Approach 2:
The patent changes the physical parameters of the ink (viscosity, surface tension, boiling point) by selecting specific solvent components and their ratios, rather than adding additives, thereby achieving nozzle compatibility without compromising charge transport
2Productivity
If inkjet printing is used to manufacture OLED or QLED displays, then material utilization rate and production efficiency are improved, but high requirements on ink physical parameters cause formulation difficulties
Solution Approach 1:
The patent optimizes the physical parameters of the ink (viscosity 2-15 cP, surface tension 25-40 mN/m, boiling point above 100°C) by selecting specific solvent components and their ratios, enabling direct inkjet printing without complex additive formulations
Solution Approach 2:
The patent uses a composite solvent system comprising multiple organic solvents (e.g., tetrahydrofuran, chlorobenzene, toluene) with specific molecular structures, creating a synergistic formulation that meets all inkjet printing requirements while maintaining material stability
3Ease of operation
If conventional solvents are used, then inkjet printing can be performed, but material precipitation occurs causing nozzle clogging
Solution Approach 1:
The patent adjusts the solvent parameters (polarity, molecular weight, boiling point) to match the solubility requirements of quantum dot and organic light emitting materials, ensuring stable dissolution and preventing precipitation during printing and drying
Solution Approach 2:
The patent uses specific organic solvents as intermediaries that bridge the compatibility between quantum dot materials (with long-chain alkane wrappers) and organic light emitting materials, providing a common solvent environment where both materials remain stable and soluble
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 inkjet printing process produces uniform films with reduced nozzle clogging, ensuring higher luminous performance and longer service life of electroluminescent devices by utilizing the unique solvent system that maintains compatibility with quantum dot and organic light emitting materials.
Implementation Method 1
The alkyl substituted tetrahydronaphthalene has good compatibility with quantum dot and organic light emitting materials, making both the quantum dot material and the organic light emitting material have good solubility in the same solvent system
Implementation Method 2
the ink solvent can be removed by vacuum evaporation or heating evaporation, etc., so that the solvents in the printed electroluminescent layer can be completely volatilized
Implementation Method 3
the ink solvent can be removed by vacuum evaporation or heating evaporation
Implementation Method 4
The main function of the organic light emitting material is to recombine electrons and holes in whole or in part on the molecules of the organic light emitting material to generate excitons, and then transfer the energy of the excitons to quantum dots
Implementation Method 5
transfer the energy of the excitons to quantum dots
Data Source
AI summary
The present disclosure relates to an electroluminescent material ink, comprising a quantum dot material, an organic light emitting material, and an organic solvent. The organic solvent includes a first solvent shown in general formula (I):wherein R0 is CmH2m+1; R1, R2, R3, and R4 are each independently CnH2n+1, 0≤m≤8 and 0<n≤8, or 0<m≤8 and 0≤n≤8. The electroluminescent material ink has good physical parameters and can effectively prevent nozzle blockage.