Condensed Cyclic Compound for OLED Electron Injection
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Solution Overview
Problem
Current organic light-emitting devices face limitations in achieving optimal electron injection and transport due to the lack of effective materials that can efficiently manage electron-withdrawing groups and dipole-dipole interactions in their structures.
Innovation Solution
A condensed cyclic compound represented by Formula 1 is introduced, which includes electron-withdrawing groups that facilitate electron injection and transport through dipole-dipole interactions, and can be incorporated into the organic light-emitting device's layers, such as the hole transport region, electron transport region, or emission layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic light-emitting device materials are used, then device structure is simple, but electron injection and transport efficiency is insufficient
Solution Approach 1:
The patent introduces a condensed cyclic compound with specific structural parameters (Formula 1) that changes the electron-withdrawing group characteristics and dipole moment of the material. This parameter change enables efficient electron injection and transport without complicating the overall device structure, resolving the contradiction between reliability improvement and device complexity
Solution Approach 2:
The patent employs a composite material approach by incorporating the condensed cyclic compound (Formula 1) into the organic light-emitting device layers. This composite material strategy enhances electron injection and transport properties through the unique molecular structure containing electron-withdrawing groups and dipole-dipole interactions, while maintaining compatibility with existing device architectures
2Productivity
If materials with enhanced electron transport properties are introduced, then light-emission efficiency improves, but driving voltage may increase
Solution Approach 1:
The condensed cyclic compound in Formula 1 is designed with specific parameter optimizations including electron-withdrawing group positioning and dipole moment control. These parameter changes enable high light-emission efficiency while maintaining appropriate driving voltage levels by balancing electron transport capability with energy consumption
Solution Approach 2:
The patent applies local quality enhancement by introducing electron-withdrawing groups at specific positions in the molecular structure (Formula 1). This localized modification improves electron injection and transport properties in the emission layer without requiring overall device voltage increase, thus improving productivity without proportionally increasing energy use
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 use of the condensed cyclic compound enhances electron injection and transport properties, leading to improved light-emission efficiency and performance in organic light-emitting devices without increasing driving voltage.
Implementation Method 1
electron-withdrawing groups that facilitate electron injection and transport through dipole-dipole interactions
Implementation Method 2
Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. These excitons transit from an excited state to a ground state, thereby generating light.
Data Source
AI summary
A condensed cyclic compound and an organic light-emitting device are provided, the condensed cyclic compound being represented by Formula 1.in which R1 may be selected from a C6-C60 aryl group, a C1-C60 heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from —F, —Cl, —Br, —I, a cyano group, and a nitro group, and at least one selected from R2 to R13 may be a group represented by Formula 2*-(L11)a11-(Ar11)b11, <Formula 2>Formulae 1 and 2 being fully described in the specification.