OLED Emitting Layer Composition for Balanced Charge Transport
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Solution Overview
Problem
Existing organic light emitting devices face challenges in improving driving voltage, efficiency, and lifetime.
Innovation Solution
Incorporating a compound of Chemical Formula 1 and a compound of Chemical Formula 2 in the light emitting layer, where Chemical Formula 1 has excellent hole transport characteristics and Chemical Formula 2 has excellent electron transport characteristics, with a weight ratio of 5:5 to 7:3, to enhance current efficiency, power efficiency, and lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a voltage is applied between two electrodes in a conventional organic light emitting device, then holes are injected from anode and electrons are injected from cathode into the organic material layer, but the device suffers from insufficient current efficiency and short lifetime due to imbalance in charge transport
Solution Approach 1:
The patent applies local quality by using different materials with specific properties in different regions of the organic material layer. The first material has hole transport capability while the second material has electron transport capability, creating localized charge transport pathways that balance the overall charge distribution and improve both current efficiency and device lifetime.
Solution Approach 2:
The patent employs composite materials by combining two distinct organic materials in the organic material layer. The first material (Formula 1) and second material (Formula 2) work synergistically to provide balanced hole and electron transport, respectively, resolving the charge imbalance issue and improving device performance metrics including current efficiency and lifetime.
2Device complexity
If conventional organic materials are used in the organic material layer, then the device structure is simple, but the driving voltage is high and power efficiency is poor
Solution Approach 1:
The patent implements local quality by assigning specific functional properties to different materials in the organic material layer. The first material is optimized for hole transport while the second material is optimized for electron transport, creating localized charge transport efficiency that reduces overall driving voltage requirements and improves power efficiency without complicating the device structure.
Solution Approach 2:
The patent applies parameter changes by modifying the chemical structure and transport properties of the organic materials used in the organic material layer. By selecting materials with specific molecular structures (Formulas 1 and 2) and adjusting their weight ratios, the patent optimizes charge transport parameters to reduce driving voltage and improve power efficiency while maintaining structural simplicity.
3Ease of manufacture
If the organic material layer uses a single material, then the device structure is simple to manufacture, but the efficiency and stability are insufficient
Solution Approach 1:
The patent applies local quality by using different materials with specific properties in different regions of the organic material layer. The first material has hole transport capability while the second material has electron transport capability, creating localized charge transport pathways that balance the overall charge distribution and improve both current efficiency and device lifetime.
Solution Approach 2:
The patent employs composite materials by combining two distinct organic materials in the organic material layer. The first material (Formula 1) and second material (Formula 2) work synergistically to provide balanced hole and electron transport, respectively, resolving the charge imbalance issue and improving device performance metrics including current efficiency and lifetime.
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 organic light emitting device achieves improved current efficiency, power efficiency, and lifetime characteristics by utilizing compounds with complementary transport properties in the light emitting layer.
Implementation Method 1
the light emitting layer comprises a compound of the following Chemical Formula 1, and a compound of the following Chemical Formula 2... the compound of Chemical Formula 1 has excellent hole transport characteristics
Implementation Method 2
the compound of Chemical Formula 2 has excellent electron transport characteristics
Implementation Method 3
an organic light emitting phenomenon refers to a phenomenon where electric energy is converted into light energy by using an organic material
Data Source
AI summary
Provided is an organic light emitting device comprising an anode, a hole transport layer, a light emitting layer, an electron transport layer, and a cathode, wherein the light emitting layer comprises a compound of Chemical Formula 1 and a compound of Chemical Formula 2:wherein:A is a benzene ring;Ar1 and Ar2 are independently a substituted or unsubstituted C6-60 aryl or C2-60 heteroaryl containing one or more of N, O and S;X1 to X3 are independently N or CH, provided that at least one of them is N;L is a substituted or unsubstituted C2-60 heteroarylene or a C6-60 arylene substituted with a C2-20 heteroaryl, the heteroarylene or heteroaryl containing one or more of N, O and S; andAr3 and Ar4 are independently a substituted or unsubstituted C6-60 aryl or C2-60 heteroaryl containing one or more of N, O and S.