OLED Layer Composition for Efficiency and Lifespan Balance
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Solution Overview
Problem
There is a need for the development of new materials for organic light emitting devices to enhance efficiency and stability.
Innovation Solution
The organic light emitting device includes a light emitting layer with a compound of Chemical Formula 1 and an electron transport layer or electron injection layer with compounds of Chemical Formula 2 or 3, which improve efficiency and lifespan by controlling the compounds in these layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic materials are used in the organic light emitting device, then the device can operate, but the efficiency and stability are insufficient
Solution Approach 1:
The patent modifies the molecular structure of organic compounds by changing parameters such as introducing specific heteroatoms (B, Si, Ge, Sn), adjusting substituent groups (R1-R6), and modifying the core structure (Formula 1 and Formula 2 variations) to optimize both efficiency and stability of the OLED
Solution Approach 2:
The patent employs composite organic materials combining different functional groups and heteroatoms within the molecular structure to achieve synergistic effects that improve both device efficiency and operational stability
2Reliability
If the organic material layer uses a multilayered structure with different materials, then efficiency and stability are enhanced, but the device complexity increases
Solution Approach 1:
The organic material layer is divided into multiple sub-layers including hole injection layer, hole transport layer, light emitting layer, electron transport layer, and electron injection layer, with each layer using specific compounds (Formula 1 and Formula 2) optimized for its function, thereby enhancing overall device stability while maintaining manageable complexity through functional specialization
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 enhances the efficiency and reduces the driving voltage of the organic light emitting device.
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
Data Source
AI summary
Provided is an organic light-emitting device comprising: a light emitting layer comprising a compound of the following Chemical Formula 1, and one or more of an electron transport layer, an electron injection layer, or an electron transport and injection layer that comprises at least one of a compound of the following Chemical Formula 2 and a compound of the following Chemical Formula 3:wherein Ar2 and Ar3 are each independently a substituent of Chemical Formula 4,where X1 to X5 are each independently N or C(R8), wherein at least two of X1 to X5 are N, and the other substituents are as defined in the specification. The organic light emitting device including the heterocyclic compound of Chemical Formula 1 and the heterocyclic compound of Chemical Formula 2 or 3 had significantly superior efficiency and lifespan.