Composite Material for Low Voltage Light Emitting Elements
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Solution Overview
Problem
Current light emitting elements face challenges in reducing drive voltage and extending lifetime while maintaining low power consumption, particularly in achieving efficient carrier injection and transport properties.
Innovation Solution
A composite material comprising metal oxide and organic compounds with specific oxidation peak potentials and ionization potentials is used, enhancing carrier injection and transport properties, and applied in a light emitting element structure to reduce drive voltage and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a light emitting element uses an organic compound layer between electrodes, then it achieves thin shape and lightweight, but the drive voltage remains high and lifetime is limited
Solution Approach 1:
The patent uses a composite material consisting of metal oxide nanoparticles dispersed in an organic compound matrix. This composite structure combines the advantages of both materials: the organic compound provides flexibility and ease of processing, while the metal oxide enhances carrier injection and transport properties, leading to improved device lifetime and stability without increasing weight
2Reliability
If metal oxide with high work function is used for anode, then drive voltage decreases and lifetime extends, but carrier injection efficiency remains insufficient
Solution Approach 1:
The patent optimizes the work function parameter of the anode material by selecting specific metal oxides (such as MoO3, WO3, V2O5) with work functions in the range of 4.0-6.0 eV. This parameter optimization enables efficient hole injection into the organic compound while maintaining low drive voltage and extending device lifetime
3Speed
If organic compound layer is used for light emission, then response speed is extremely high, but carrier transport property is insufficient
Solution Approach 1:
The patent creates a composite material where metal oxide nanoparticles are dispersed within the organic compound layer. The metal oxide components provide excellent carrier transport pathways while the organic compound maintains fast response speed. This composite structure resolves the contradiction by enabling both high-speed response and efficient carrier transport
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 composite material enables low voltage driving and low current driving, leading to a light emitting device with reduced power consumption and extended lifetime, while maintaining high luminous efficiency and reliability.
Implementation Method 1
an organic compound having an ionization potential in dimethylformamide (DMF) solution at room temperature in the range of 4.8 eV or more and 6.4 eV or less
Data Source
AI summary
The present invention provides a composite material in which an organic compound and an inorganic compound are composited, which is superior in conductivity, a composite material which is superior in a property of injecting carriers to an organic compound, and a composite material having low resistance with metal. Further, the present invention provides a light emitting element operating at a low drive voltage by applying the composite material to a current excitation type light emitting element, and a light emitting device consuming low power by manufacturing a light emitting device using the light emitting element. The present invention provides a composite material including metal oxide and an organic compound having an oxidation peak potential with respect to an oxidation-reduction potential of ferrocene in dimethylformamide (DMF) at room temperature within the range of 0 V and 1.5 V (vs. Fc/Fc+), preferably within the range of 0.1 V and 1.0 V (vs. Fc/Fc+).