Amine Compound Hole Transport Layer for OLED Efficiency
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Solution Overview
Problem
Current organic electroluminescence display devices face challenges in achieving low driving voltage, high luminous efficiency, and long service life, particularly in the development of materials for the hole transport region to suppress exciton energy diffusion effectively.
Innovation Solution
The use of a specific amine compound, represented by Formula 1, in the hole transport region of a light emitting element, which includes a benzocarbazole moiety and specific substituents, enhances electron resistance and exciton resistance, contributing to reduced driving voltage and high efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional hole transport materials are used, then the device structure is simple, but the luminous efficiency is low and service life is short
Solution Approach 1:
The patent modifies the molecular structure of hole transport materials by introducing specific substituents (fluoro, cyano, trifluoromethyl groups) and adjusting molecular weight parameters to optimize both luminous efficiency and service life simultaneously, resolving the contradiction between these two performance metrics
Solution Approach 2:
The patent develops composite hole transport materials combining multiple functional groups and molecular structures in a single material system, achieving synergistic effects that improve both luminous efficiency and service life beyond what conventional single-function materials can provide
2Use of energy by moving object
If the driving voltage is reduced, then the energy consumption decreases, but the luminous efficiency may be compromised
Solution Approach 1:
The patent optimizes the HOMO/LUMO energy level parameters of hole transport materials to achieve better energy alignment with adjacent layers, enabling low driving voltage operation while maintaining high luminous efficiency through improved charge injection and transport characteristics
3Productivity
If the exciton energy diffusion is suppressed, then the luminous efficiency increases, but the material complexity increases
Solution Approach 1:
The patent introduces localized functional groups (fluoro, cyano, trifluoromethyl) at specific positions on the molecular structure to create local regions with enhanced exciton binding energy and reduced diffusion tendency, achieving high luminous efficiency without requiring complete structural complexity throughout the entire material system
Data Source
AI summary
A light emitting element and an amine compound for the light emitting element are provided. The light emitting element includes a first electrode, a second electrode on the first electrode, and at least one functional layer between the first electrode and the second electrode The functional layer includes the amine compound and the luminous efficiency and service life of the light emitting element is improved.