Organic Light-Emitting Element With Cyclic Compound Electron Layer
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Solution Overview
Problem
Current organic light emitting devices face challenges in achieving high light emission efficiency and low driving voltage, with existing materials often having limitations in hole and electron blocking, leading to reduced efficiency and lifespan.
Innovation Solution
Incorporating a cyclic compound represented by Chemical Formula 1 as an electron transfer layer and a carbazole derivative represented by Chemical Formula 2 as a hole transfer layer, which together enhance electron and hole injection and transfer capabilities, resulting in improved light emission efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic materials are used in organic light emitting devices, then the device structure is simple, but the light emission efficiency is low and driving voltage is high
Solution Approach 1:
The patent employs composite organic material layers combining multiple functional materials (hole injection materials, hole transfer materials, electron transfer materials, electron injection materials) with specific properties to achieve high light emission efficiency and low driving voltage. The composite structure allows synergistic effects of different materials to overcome the limitations of single conventional materials.
Solution Approach 2:
The patent assigns different functional properties to different layers within the organic light emitting device. Each organic material layer is specifically designed with tailored properties (hole injection, hole transfer, electron transfer, electron injection) to optimize performance at specific locations, thereby achieving overall high efficiency and low operating voltage.
2Reliability
If conventional organic materials are used, then material selection is simple, but device lifespan is reduced due to poor hole and electron blocking
Solution Approach 1:
The patent divides the organic material system into distinct functional layers (hole injection layer, hole transfer layer, electron transfer layer, electron injection layer), where each layer is optimized for a specific function. This segmentation improves device lifespan by preventing degradation through specialized blocking functions, while the modular structure manages complexity through clear functional separation.
Solution Approach 2:
The patent introduces intermediate organic material layers between the electrodes and light emitting layer that act as mediators for charge transport and blocking. These intermediary layers protect the light emitting layer from excessive charge accumulation and improve device stability, extending lifespan while maintaining manageable structural complexity.
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 proposed configuration achieves high light emission efficiency, low driving voltage, and extended device lifespan by effectively blocking holes and excitons, while maintaining excellent thermal stability and mobility.
Implementation Method 1
organic materials having a p-type property, that is, organic materials readily oxidized and electrochemically stable when oxidized
Implementation Method 2
organic materials having an n-type property, that is, organic materials readily reduced and electrochemically stable when reduced
Implementation Method 3
electrons and holes are injected to the organic material layer from the cathode and the anode, respectively. The electrons and the holes injected to the organic material layer are recombined to form excitons, and light emits when these excitons fall back to the ground state
Data Source
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AI summary
The present specification relates to an organic light emitting device having high light emission efficiency.