Organic Light-Emitting Device Power Efficiency Enhancement Layer
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Solution Overview
Problem
Current organic light emitting devices face challenges in achieving improved driving voltage, efficiency, and lifetime.
Innovation Solution
The organic light emitting device comprises a specific configuration with a hole transport layer, a light emitting layer, a power efficiency enhancement layer, and a gradation enhancement layer, where the power efficiency enhancement layer and gradation enhancement layer are formed using compounds represented by Chemical Formulas 1 and 2, respectively, to enhance electron mobility and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic light emitting device structures are used, then basic light emission function is achieved, but driving voltage, efficiency and lifetime are insufficient
Solution Approach 1:
The organic light emitting device is divided into multiple functional layers including hole injection layer, hole transport layer, light emitting layer, electron transport layer, and electron injection layer. Each layer is optimized independently with specific compounds to improve overall device performance, efficiency and lifetime without excessive complexity
Solution Approach 2:
The patent employs composite material structures where each layer uses specifically selected organic compounds with complementary properties. The hole transport layer uses compounds with high hole mobility, electron transport layer uses compounds with high electron mobility, creating a synergistic composite structure that improves device reliability and efficiency
2Productivity
If voltage is applied between electrodes to inject carriers, then light emission occurs, but efficiency and power consumption are limited
Solution Approach 1:
Different layers are assigned specific functional properties optimized for their role: hole injection layer has high hole injection capability, electron injection layer has high electron injection capability, light emitting layer has high luminescence efficiency. This localized optimization of material properties in each layer improves overall conversion efficiency from electrical energy to light while reducing wasted energy
Solution Approach 2:
The patent optimizes key parameters including HOMO/LUMO energy levels, carrier mobility, and triplet energy levels for each layer's compounds. By carefully selecting compounds with appropriate energy level alignments and high carrier mobility, the device achieves improved power efficiency and reduced operating voltage, lowering power consumption
3Reliability
If multilayered organic material layer structure is used to enhance efficiency, then device performance improves, but manufacturing complexity increases
Solution Approach 1:
The device structure is segmented into distinct functional layers that can be independently optimized and manufactured. Each layer uses compounds with specific properties tailored to its function, allowing for systematic manufacturing processes while maintaining high device efficiency and performance
Solution Approach 2:
The patent employs compounds that can serve multiple functions within their respective layers, such as compounds that provide both charge transport and exciton blocking capabilities, or compounds with high stability that contribute to both efficiency and device lifetime, simplifying the overall manufacturing process
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
This configuration results in improved driving voltage, efficiency, and extended lifetime of the organic light emitting device, with a minimal change in efficiency across varying current densities, preventing panel failure and ensuring long-term performance.
Implementation Method 1
an organic light emitting phenomenon refers to a phenomenon where electric energy is converted into light energy by using an organic material
Implementation Method 2
the holes are injected from an anode into the organic material layer and the electrons are injected from the cathode into the organic material layer
Implementation Method 3
the holes are injected from an anode into the organic material layer and the electrons are injected from the cathode into the organic material layer
Data Source
Figure 1~3
AI summary
The present invention provides an organic light emitting device having improved driving voltage, efficiency and lifetime.