Cyclohexadiene Compounds for OLED Voltage and Stability
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Solution Overview
Problem
There is a need to improve the performance of organic semiconductor materials and devices, specifically to achieve better operating voltage, efficiency, lifetime, and voltage stability over time, while also enhancing LUMO energy, dipole moment, and thermal properties.
Innovation Solution
A compound of formula (I) is introduced, which includes specific functional groups and substituents that improve the characteristics of organic semiconductor layers, leading to enhanced performance in organic electronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional organic semiconductor materials are used in OLEDs, then the devices can achieve basic light emission functionality, but the operating voltage is high and efficiency is limited
Solution Approach 1:
The patent modifies the molecular structure of organic semiconductor compounds by introducing specific functional groups (cyano, fluorinated alkyl, aryl, heteroaryl) and varying substituent patterns to optimize electronic properties. This changes key parameters such as HOMO/LUMO energy levels, dipole moments, and charge carrier mobility, enabling lower operating voltages and improved efficiency in OLED devices
Solution Approach 2:
The invention creates composite organic semiconductor materials combining multiple functional moieties within a single molecular structure. The compound integrates electron-withdrawing groups (cyano, fluorinated alkyl), aromatic systems (phenyl, naphthyl, anthracenyl), and heterocyclic components, forming a composite structure that synergistically improves charge transport and reduces operating voltage
2Reliability
If conventional organic semiconductor materials are used, then devices can operate initially, but lifetime and voltage stability over time are insufficient
Solution Approach 1:
The patent optimizes molecular parameters including dipole moment (enhanced through cyano and fluorinated groups), HOMO-LUMO gap, and charge carrier mobility to improve device reliability. These parameter adjustments lead to better voltage stability over time and extended operational lifetime by reducing degradation mechanisms
Solution Approach 2:
The invention develops small-molecule organic semiconductor compounds that can be processed into thin films for OLED fabrication. These molecular structures are designed to resist degradation, replacing less stable conventional materials with compounds that maintain their electronic properties over extended operational periods
3Temperature
If standard organic semiconductor compounds are used, then basic device fabrication is possible, but thermal stability and processing properties at elevated temperatures are inadequate
Solution Approach 1:
The patent introduces fluorinated alkyl groups and aromatic systems into the molecular structure, which significantly enhance thermal stability by increasing glass transition temperatures and improving molecular packing. These structural modifications allow the materials to maintain stability during high-temperature processing and operation while remaining amenable to fabrication techniques
Solution Approach 2:
The invention incorporates specific local structural features (fluorinated alkyl chains, aromatic rings, heteroaryl groups) at strategic positions within the molecular structure. These localized modifications provide thermal stability without compromising overall processability, allowing different regions of the molecule to fulfill different functional requirements
Data Source
AI summary
The invention is directed to a compound of formula (I) for use in organic electronic devices, an organic semiconductor layer comprising the compound of formula (I), an organic electronic device comprising the organic semiconductor layer, and a display device comprising the organic electronic device. Wherein R1, R2, R3 and R4 are independently selected from F, Cl, CN or CF3; R′ is selected from formula (II); R″ is selected from formula (III); R5 is selected from substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl or CN; and the “*” denotes the binding position.