Composite Light-Emitting Element via Fluorene-Inorganic Co-evaporation
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Solution Overview
Problem
Current light-emitting elements face challenges in achieving high emission efficiency, long lifespan, and low power consumption, particularly in reducing driving voltage and maintaining reliability, while also requiring a balance between carrier transport and light-transmitting properties.
Innovation Solution
A composite material comprising a hydrocarbon compound with a fluorene unit and an inorganic compound exhibiting electron-accepting properties, where the hydrocarbon compound has a molecular weight between 400 and 2000, is used to form a light-emitting element with improved emission efficiency, reliability, and reduced power consumption by co-evaporation, preventing energy gap narrowing and ensuring high light-transmitting properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light-emitting element uses conventional organic compounds with smaller molecular weights, then the material exhibits better carrier transport properties, but the energy gap narrows and light-transmitting properties deteriorate
Solution Approach 1:
The patent changes the molecular weight parameter of the organic compound to a specific range (400-2000) to simultaneously achieve good carrier transport properties and maintain a wide energy gap for high light-transmitting properties. This parameter optimization resolves the contradiction between carrier transport and light transmission.
Solution Approach 2:
The patent creates a composite light-emitting layer by combining organic compounds with inorganic compounds. This composite structure enables the material to exhibit both good carrier transport properties (from the organic component) and high light-transmitting properties with wide energy gap (from the inorganic component), resolving the contradiction between these two properties.
2Illumination intensity
If a light-emitting element uses organic compounds with larger molecular weights to maintain wide energy gap, then light-transmitting properties improve, but carrier transport properties deteriorate
Solution Approach 1:
The patent optimizes the molecular weight parameter to a balanced range (400-2000) rather than using extremely large molecular weights. This parameter control ensures the energy gap remains wide for good light transmission while maintaining sufficient carrier transport capability.
Solution Approach 2:
By forming a composite of organic and inorganic compounds, the patent compensates for the carrier transport limitation of high molecular weight organic compounds. The inorganic component enhances carrier transport while the organic component maintains the wide energy gap, achieving both properties simultaneously.
3Use of energy by stationary object
If a light-emitting element reduces driving voltage to improve power efficiency, then power consumption decreases, but emission efficiency and lifespan may be compromised
Solution Approach 1:
The composite light-emitting layer combines organic and inorganic compounds to create a material system that enables low driving voltage operation. The synergistic effect of the composite structure improves both power efficiency and device stability, allowing reduced power consumption without sacrificing lifespan.
Solution Approach 2:
The patent optimizes molecular weight and compositional parameters of the light-emitting material to achieve better carrier injection and transport. This enables the device to operate at lower voltages while maintaining high emission efficiency and extended lifespan through improved material stability.
4Loss of energy
If a light-emitting element increases emission efficiency, then energy-saving property improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent uses a composite of organic and inorganic compounds where each component has a specific function. The organic compound provides the light-emitting core structure while the inorganic compound enhances carrier transport and stability. This functional division in the composite achieves high emission efficiency without excessive complexity.
Solution Approach 2:
The patent optimizes key parameters such as molecular weight (400-2000) and compositional ratios to achieve high emission efficiency. By controlling these parameters within specific ranges, the patent achieves energy-saving performance while keeping manufacturing complexity manageable through standardized material selection criteria.
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 light-emitting elements with high emission efficiency, extended lifespan, and low power consumption, while maintaining a wide energy gap and preventing crystallization, thus enhancing reliability and carrier balance.
Implementation Method 1
an inorganic compound which exhibits an electron-accepting property with respect to the hydrocarbon compound
Implementation Method 2
by co-evaporation, preventing energy gap narrowing and ensuring high light-transmitting properties
Data Source
AI summary
Provided is a composite material which makes it possible to provide a light-emitting element having at least one of the following characteristics by applying the composite material to the light-emitting element: low voltage driving, high emission efficiency, and a long life (high reliability). The composite material includes a hydrocarbon compound and an inorganic compound which exhibits an electron-accepting property with respect to the hydrocarbon compound. The hydrocarbon compound has a molecular weight of greater than or equal to 400 and less than or equal to 2000, where one or more aryl groups are bonded to a fluorene unit.