Polycyclic Electron Transport Layer for Longer-Lived OLED Emission
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Solution Overview
Problem
Existing light emitting devices face challenges in improving luminous efficiency and device service life, particularly in electroluminescence displays where the recombination of holes and electrons in an emission layer affects the longevity and brightness of the display.
Innovation Solution
Incorporation of a polycyclic compound as an electron transport layer material, specifically represented by Formulas 1, 1-1, and 1-2, which enhances the electron transport region, along with optional compounds from Formulas 2 and 3, to improve the efficiency and lifespan of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electron transport layer materials are used, then device structure is simple, but luminous efficiency and device service life are insufficient
Solution Approach 1:
The patent modifies the chemical structure parameters of electron transport layer materials by introducing specific polycyclic compound structures with defined molecular weights and functional groups, thereby improving device service life and luminous efficiency while maintaining reasonable structural complexity
Solution Approach 2:
The patent employs composite material strategies by combining polycyclic aromatic hydrocarbon cores with specific electron-transporting functional groups and substituent patterns, creating materials that achieve both high reliability and optimized device performance
2Productivity
If conventional electron transport layer materials are used, then material selection is simple, but luminous efficiency is insufficient
Solution Approach 1:
The patent applies local quality by designing polycyclic compounds with specific functional groups positioned at particular locations on the molecular framework, enabling targeted electron transport properties that enhance luminous efficiency without requiring complex overall material compositions
Solution Approach 2:
The patent optimizes luminous efficiency by adjusting molecular weight, aromatic ring count, and functional group types within the polycyclic compound structure, achieving high productivity through controlled parameter variations rather than complex material systems
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A polycyclic compound represented by Formula 1: and a light emitting device including a first electrode, a hole transport region on the first electrode, an emission layer on the hole transport region, an electron transport region on the emission layer, and a second electrode on the electron transport region are provided. The electron transport region includes a polycyclic compound represented by Formula 1.