Inkjet-Printable Metal Oxide Composition for Light-Emitting Devices
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Solution Overview
Problem
Existing light-emitting devices face challenges in achieving low driving voltage, high luminescence efficiency, and long lifespan, particularly when using zinc oxide, which can introduce defects and affect emission layer characteristics.
Innovation Solution
A composition is developed that includes a solvent with specific first compounds represented by Formula 1 and a metal oxide not containing zinc. This composition is easy to form into a film using inkjet printing and is used to create a light-emitting device with improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If zinc oxide is used in the light-emitting device, then the device can be manufactured with conventional materials, but the driving voltage increases and luminescence efficiency decreases due to defects introduced by zinc oxide
Solution Approach 1:
The patent removes zinc oxide from the light-emitting device composition and replaces it with alternative metal oxides such as tin oxide, indium oxide, or gallium oxide. This extraction of the harmful zinc oxide component eliminates the defects it introduces while maintaining the functional performance of the device, thereby resolving the contradiction between ease of manufacture and reliability.
Solution Approach 2:
The patent changes the chemical composition parameter by substituting zinc oxide with other metal oxides that have different properties. This parameter change allows the device to maintain manufacturability while improving driving voltage and luminescence efficiency, as the alternative metal oxides do not introduce the same defects as zinc oxide.
2Ease of manufacture
If conventional materials are used in the light-emitting device, then the manufacturing process is simple, but the lifespan of the device is reduced
Solution Approach 1:
The patent extracts and removes conventional materials that limit device lifespan from the composition. By replacing these materials with alternative metal oxide-based compounds that have superior stability and durability, the device lifespan is extended while maintaining manufacturing simplicity through the use of readily available materials.
Solution Approach 2:
The patent employs composite materials comprising alternative metal oxides combined with appropriate host materials and dopants. These composite materials provide both ease of manufacture and extended device lifespan, as the composite structure leverages the beneficial properties of each component while avoiding the limitations of conventional single-material approaches.
3Reliability
If the composition is designed for high luminescence efficiency, then the light emission performance improves, but the ease of forming into a film by inkjet printing decreases
Solution Approach 1:
The patent adjusts the physical and chemical parameters of the composition, including viscosity, surface tension, and boiling point, to optimize both luminescence efficiency and inkjet printing performance. By carefully controlling these parameters, the composition achieves high luminescence efficiency while remaining suitable for inkjet printing, thus resolving the contradiction between performance and manufacturability.
Solution Approach 2:
The patent applies local quality by optimizing different aspects of the composition for specific functions: the metal oxide provides high luminescence efficiency, while the solvent system is specifically tuned for inkjet printing compatibility. This localized optimization of different components allows the overall composition to achieve both high performance and ease of film formation.
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 light-emitting device exhibits a relatively low driving voltage, high luminescence efficiency, and long lifespan, making it suitable for various electronic applications.
Implementation Method 1
a composition that is relatively easy to form into a film by inkjet printing
Implementation Method 2
Light-emitting devices are devices that convert electrical energy to light energy
Implementation Method 3
Carriers, such as the holes and electrons, recombine in the emission layer to produce excitons. As the excitons transition and/or relax from an excited state to a ground state, light may be generated.
Data Source
AI summary
A composition includes a solvent containing one or more types (kinds) of first compounds represented by Formula 1 and a metal oxide not including zinc:Z—O-L1-O-(L2-O)n—R1. Formula 1