Condensed-Cyclic Compound for OLED Electron Transport
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Solution Overview
Problem
Existing organic light-emitting devices require improvement in driving voltage, light-emitting efficiency, and lifetime, particularly in the electron transport layer.
Innovation Solution
A condensed-cyclic compound represented by Formula 1, which includes an anthracene, fluorene, or carbazole moiety fused with an imidazo pyridinyl or imidazo pyrimidinyl group, is used in the electron transport layer of organic light-emitting devices to enhance electron transport capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional organic compounds are used in the electron transport layer, then the device structure is simple, but the driving voltage is high and light-emitting efficiency is low
Solution Approach 1:
The patent changes the chemical parameters of the electron transport layer by using condensed-cyclic compounds with specific molecular structures (Formula 1) that have fused ring systems including imidazo pyridinyl or imidazo pyrimidinyl groups. These structural parameter changes result in improved electron transport capability, lower driving voltage, and higher light-emitting efficiency without significantly increasing device complexity
Solution Approach 2:
The patent employs composite molecular structures combining multiple functional moieties (anthracene, fluorene, carbazole fused with imidazo pyridinyl or imidazo pyrimidinyl groups) within a single compound framework. This composite approach at the molecular level creates materials with superior electron transport properties while maintaining structural integrity and device compatibility
2Productivity
If conventional organic compounds are used in the electron transport layer, then the manufacturing process is simple, but the light-emitting efficiency is low
Solution Approach 1:
The patent modifies the molecular parameters of the electron transport compounds by introducing condensed-cyclic structures with specific heterocyclic groups. These parameter changes enhance light-emitting efficiency through improved electron transport and carrier recombination, while the compounds remain synthesizable using standard organic synthesis techniques
Solution Approach 2:
The patent introduces specific functional groups (imidazo pyridinyl or imidazo pyrimidinyl) at localized positions within the molecular structure (represented by X1, X2, and substituent positions in Formula 1). This local modification approach enhances electron transport capability and light-emitting efficiency without requiring complete restructuring of the entire molecule, thereby maintaining ease of manufacture
3Reliability
If conventional organic compounds are used in the electron transport layer, then the device structure is simple, but the lifetime is short
Solution Approach 1:
The patent changes the molecular parameters by using condensed-cyclic compounds with fused ring systems that provide enhanced structural stability and resistance to degradation. These parameter changes in molecular structure translate to improved device lifetime and reliability, while the overall device architecture remains relatively simple
Solution Approach 2:
Instead of trying to protect the device from degradation through complex protective structures or multiple layers, the patent inverts the approach by building degradation resistance directly into the molecular structure of the electron transport compound itself through condensed-cyclic frameworks that are inherently more stable and resistant to oxidative and thermal degradation
Data Source
AI summary
A condensed-cyclic compound represented by Formula 1 below, an organic light-emitting device including the same, and a flat panel display apparatus including the organic light-emitting device:X1, Ar1, Ar2, Ar3, Ar4, Ar5, Ar6, Ar7, Ar8, Ar9, Ar10, Ar11, and Ar12 being described in the detailed description of the invention. The organic light-emitting device including an organic layer including the compound above has low driving voltage and high emission efficiency.