Organic Light-Emitting Device With Dual-Function Material Layer
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Solution Overview
Problem
There is a continuous need for developing new materials to improve the efficiency and stability of organic light emitting devices.
Innovation Solution
An organic light emitting device comprising an anode, a cathode, and a first organic material layer with a compound of Chemical Formula 1 and a compound of Chemical Formula 2, which enhances electron injection and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-layered organic material structure is used, then efficiency and stability are improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functional layers (hole injection layer, hole transport layer, electron blocking layer, light emitting layer, electron transport layer, electron injection layer) into a single organic material layer. This first organic material layer contains both hole-transporting compounds (Formula 1) and electron-transporting compounds (Formula 2), merging the functions of multiple traditional layers into one integrated structure, thereby reducing device complexity while maintaining efficiency and stability
Solution Approach 2:
The first organic material layer is designed to perform multiple functions simultaneously: it serves as both hole transport and electron transport medium, provides electron injection, and enables light emission. The compound of Formula 1 primarily handles hole transport while the compound of Formula 2 handles electron transport and injection, creating a universal layer that replaces multiple specialized layers
2Device complexity
If conventional organic materials are used, then device structure is simple, but driving voltage is high and efficiency is low
Solution Approach 1:
The patent changes the chemical and electronic parameters of the organic material by introducing specific molecular structures (Formula 1 and Formula 2) with tailored HOMO and LUMO energy levels. The compound of Formula 1 has appropriate HOMO level for hole injection and transport, while the compound of Formula 2 has appropriate LUMO level for electron injection and transport. This parameter optimization enables low driving voltage operation without complicating the device structure
Solution Approach 2:
The first organic material layer uses a composite system combining two different organic compounds (Formula 1 and Formula 2) with complementary functions. This composite material approach allows simultaneous optimization of hole transport, electron transport, and electron injection properties, achieving low driving voltage and high efficiency while maintaining structural simplicity
3Productivity
If electron injection is enhanced, then efficiency increases, but material selection becomes more difficult
Solution Approach 1:
The compound of Formula 2 acts as an intermediary material that facilitates electron injection from the cathode into the light emitting layer. It serves as an electron injection layer that mediates between the cathode and the rest of the organic material, enabling efficient electron injection without requiring complex material systems. The specific molecular structure of Formula 2 with appropriate LUMO level provides this intermediary function
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 device achieves low driving voltage, high efficiency, and long service life by incorporating both compounds in the first organic material layer.
Implementation Method 1
An organic light emission phenomenon generally refers to a phenomenon converting electrical energy to light energy using an organic material
Data Source
AI summary
An organic light-emitting device including a compound of Chemical Formula 1 and a compound of Chemical Formula 2:wherein: X1 is O or S; Cy1 is a substituted or unsubstituted dibenzofuran or a substituted or unsubstituted dibenzothiophene; Ar1 is a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group; and the other substituents are as defined in the specification;where Ar2 is a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group; Ar3 is Chemical Formula A, and Z10 or Z11 of Chemical Formula A is linked to L2 of Chemical Formula 2:where X2 is O or S; Cy2 is a substituted or unsubstituted benzene or a substituted or unsubstituted naphthalene; and the other substituents are as defined in the specification.