Azoline Ring Compound Electron Transport Layer Voltage Efficiency Trade-off
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Solution Overview
Problem
Current electron transport/injection layer materials for organic electroluminescent elements, such as pyridine and benzimidazole derivatives, fail to achieve a well-balanced reduction in driving voltage, quantum efficiency, and extended lifetime, limiting their adoption in displays.
Innovation Solution
A novel azoline ring-containing compound is synthesized and used as an electron transport/injection layer material, featuring a specific structure with an azoline ring core and linking portion, improving charge transport and stability, thereby enhancing quantum efficiency and element lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If pyridine or bipyridine derivatives are used as electron transport/injection layer material, then driving voltage is reduced, but quantum efficiency and element lifetime are insufficient
Solution Approach 1:
The invention changes the chemical structure parameters of the electron transport/injection layer material by introducing azoline ring-containing compounds with specific molecular weight ranges (300-1000) and structural features (Y representing -O-, -S-, or >N-Ar). This structural parameter change enables simultaneous improvement in driving voltage, quantum efficiency, and element lifetime, resolving the contradiction between low voltage operation and long lifetime reliability.
Solution Approach 2:
The patent employs composite material design by combining the azoline ring core structure with various aromatic hydrocarbon groups (φ) and heterocyclic groups (Ar), creating a family of compounds with optimized properties. The composite structure allows tuning of electron transport capability, stability, and efficiency simultaneously, achieving well-balanced performance across all three parameters.
2Reliability
If benzimidazole or benzothiazole derivatives are used as electron transport/injection layer material, then practical application is enabled, but characteristics are insufficient for widespread adoption
Solution Approach 1:
The invention modifies the structural parameters of existing practical materials by replacing benzimidazole or benzothiazole cores with azoline ring-containing structures. This parameter change maintains practical usability while significantly improving quantum efficiency, enabling widespread adoption in display applications.
3Power
If conventional nitrogen-containing aromatic ring-based compounds are used, then electron transport function is achieved, but quantum efficiency cannot be sufficiently improved
Solution Approach 1:
The patent applies local quality enhancement by introducing specific functional groups (Y = -O-, -S-, or >N-Ar) at particular positions of the azoline ring structure. This localized structural optimization improves electron transport function at specific sites while minimizing energy loss, thereby achieving high quantum efficiency without sacrificing transport capability.
Solution Approach 2:
The invention changes the chemical composition parameters by incorporating heteroatoms (O, S, N) and aromatic groups into the azoline ring structure, optimizing the balance between electron transport function and energy efficiency. This parameter optimization reduces energy loss while maintaining strong electron transport capability.
Data Source
AI summary
An object is to provide an azoline ring-containing compound which achieves characteristics required for an organic EL element, such as a driving voltage, a quantum efficiency, and element lifetime in a well-balanced manner, and particularly can obtain a high quantum efficiency, for example, in a case where the azoline ring-containing compound is used for the organic EL element. The above object is achieved by an azoline ring-containing compound represented by the following general formula (1).In formula (1), φ represents an m-valent group derived from an aromatic hydrocarbon having 6 to 40 carbon atoms or the like, Y represents —O—, —S—, or >N—Ar, R1 to R5 each represent a hydrogen atom or an alkyl having 1 to 4 carbon atoms, and L represents a phenylene group or the like.