Organic Compound for OLED Driving Voltage Reduction
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Solution Overview
Problem
Current organic light emitting diodes (OLEDs) face challenges with high driving voltage and current density, which affect stability and lifetime, and there is a need for materials that can improve charge transporting properties to reduce power consumption and enhance efficiency.
Innovation Solution
An organic compound with an arylamine moiety and a hetero-aromatic moiety is used, providing excellent hole transporting and charge generation properties, which is incorporated into the OLED structure to improve hole injection and transport, and balance electron and hole migration, thereby reducing driving voltage and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional charge transporting materials are used in OLEDs, then the device can operate with basic charge transport functionality, but the driving voltage remains high and the lifetime is reduced due to strong stress on organic materials
Solution Approach 1:
The patent modifies the molecular structure of charge transporting materials by introducing vinyl end-groups and specific heteroatom substitutions (X1-X5 where at least one is N) to change the electronic and physical parameters of the material. This structural parameter change enables the material to reduce driving voltage and decrease stress on organic materials, thereby improving OLED lifetime while maintaining reliability
Solution Approach 2:
The patent employs composite organic compounds that combine multiple functional moieties (arylamine, hetero-aromatic rings with nitrogen atoms) within a single molecular structure. This composite approach allows the material to simultaneously provide charge transport, voltage reduction, and stress mitigation functions, resolving the contradiction between reliability and material stress
2Productivity
If high current density is applied to OLEDs to improve brightness and efficiency, then the emitting efficiency increases, but the stability and lifetime of the device deteriorate due to strong stress on organic materials
Solution Approach 1:
The patent changes the electrical parameters of the charge transporting material through molecular design, specifically introducing nitrogen-containing hetero-aromatic structures that optimize charge transport properties. This enables the material to handle high current densities more effectively, improving emitting efficiency while reducing the destabilizing stress on organic materials
Solution Approach 2:
The patent develops organic compounds with vinyl end-groups that provide enhanced stability and reduced degradation. These modified materials can withstand the harsh conditions of high current density operation without rapid degradation, effectively replacing less stable conventional materials and enabling sustained high-efficiency operation
3Use of energy by moving object
If the driving voltage of OLEDs is reduced to lower power consumption, then energy efficiency improves, but charge transport performance may deteriorate without appropriate material optimization
Solution Approach 1:
The patent optimizes the energy level parameters of the charge transporting material through molecular design, specifically adjusting the HOMO and LUMO levels by introducing nitrogen-containing hetero-aromatic structures. This parameter optimization enables the material to facilitate efficient charge transport at reduced driving voltages, simultaneously improving power consumption and maintaining charge transport performance
Solution Approach 2:
The patent employs the organic compound as an intermediary material between electrodes and emitting layers, where the specially designed molecular structure mediates charge transport at lower energy costs. The vinyl end-groups and nitrogen-containing rings act as intermediaries that reduce the energy barrier for charge injection and transport, enabling low-voltage operation without sacrificing performance
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 organic compound effectively reduces the driving voltage and power consumption of OLEDs, improves emitting efficiency, and extends the lifetime by enhancing the balance of charge carriers and reducing stress on the materials.
Implementation Method 1
providing excellent hole transporting and charge generation properties, which is incorporated into the OLED structure to improve hole injection and transport
Implementation Method 2
combining the electrons with the holes, generating an exciton, and transforming the exciton from an excited state to a ground state
Data Source
AI summary
The present invention provides an organic compound for an organic light emitting diode. The organic compound is represented by:The organic compound is capable of reducing a driving voltage of an organic light emitting diode by an excellent charge transporting property. The present invention also provides an organic light emitting diode and an organic light emitting display device including the organic compound.