Organic Light-Emitting Device with Balanced Charge-Transport Layers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a continuous need for developing new materials to improve the efficiency, stability, and reduce the driving voltage of organic light-emitting devices.
Innovation Solution
The use of specific compounds in the first and second organic material layers, where the first layer includes a benzonaphthofuran-linked anthracene structure for electron donation and the second layer includes a cyano group or polycyclic heterocyclic group for electron withdrawal, enhancing electron transport and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional organic materials are used in the light emitting device, then the device can operate, but the driving voltage is high and the efficiency is low
Solution Approach 1:
The patent changes the chemical structure parameters of the organic materials by introducing specific molecular structures (Formula 1 with benzonaphthofuran-2-yl group and Formula 2 with electron-withdrawing groups) to optimize electron transport properties, thereby reducing driving voltage and improving efficiency
Solution Approach 2:
The patent uses composite organic material layers where Formula 1 compounds (with electron-donating groups) and Formula 2 compounds (with electron-withdrawing groups) are combined in specific layers to create a balanced electron-hole transport system that reduces voltage and enhances efficiency
2Duration of action of stationary object
If conventional organic materials are used in the light emitting device, then the device can operate, but the lifetime is short
Solution Approach 1:
The patent modifies the molecular structure parameters by incorporating rigid polycyclic heterocyclic groups and cyano groups that enhance thermal stability and chemical inertness, thereby extending device lifetime
Solution Approach 2:
The patent combines compounds with electron-donating groups (Formula 1) and electron-withdrawing groups (Formula 2) to create a balanced chemical system that improves overall material stability and device lifetime through complementary properties
3Reliability
If electron transport layer is added to improve efficiency, then light emitting efficiency increases, but device structure becomes more complex
Solution Approach 1:
The patent designs compounds where Formula 1 materials serve as both hole transport and electron blocking materials, while Formula 2 materials serve as electron transport and hole blocking materials, reducing the need for separate dedicated layers and simplifying device structure
Solution Approach 2:
The patent optimizes the molecular parameters of the organic materials to achieve multi-functional behavior, where single compounds can perform multiple functions (electron transport, hole transport, electron blocking, hole blocking) depending on their specific structure
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 compounds improve the device's efficiency, reduce the driving voltage, and extend its lifetime by balancing hole-electron mobility and providing thermal stability.
Implementation Method 1
the first organic material layer includes a compound of Formula 1... the second organic material layer includes a compound of Formula 2... enhancing electron transport and stability
Implementation Method 2
when the injected holes and electrons meet each other, an exciton is formed, and light is emitted when the exciton falls down again to a ground state
Data Source
AI summary
Provided is an organic light-emitting device comprising: a first electrode; a second electrode provided to face the first electrode; and a first organic material layer and a second organic material layer provided between the first electrode and the second electrode, in which the first organic material layer includes a compound of Formula 1, and the second organic material layer includes a compound of Formula 2.