[5]Helicene Arylamine Host Material for OLED Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic electroluminescent devices face challenges in service life and efficiency, particularly as the size of displays increases, leading to higher driving voltages and the need for improved luminous and current efficiencies.
Innovation Solution
The development of an arylamine compound with a triarylamine structure formed using [5]helicene as a parent nucleus, which enhances hole transport properties and inhibits molecular stacking, thereby improving film-forming properties and carrier balance in electroluminescent layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the area of display becomes larger, then the coverage and visibility are improved, but the driving voltage increases and efficiency decreases
Solution Approach 1:
The patent changes the chemical and physical parameters of the host material by introducing [5]helicene structure with specific substituents (L1, L2, L3, Ar1, Ar2) to optimize hole mobility and carrier balance. This material parameter change enables larger displays to operate at lower driving voltages while maintaining efficiency
Solution Approach 2:
The patent uses composite material design by combining [5]helicene core structure with various aromatic substituents (aryl, heteroaryl groups) to create host materials with optimized properties for large-area OLEDs, achieving both low driving voltage and high efficiency
2Area of stationary object
If the area of display becomes larger, then the coverage and visibility are improved, but the luminous efficiency and current efficiency decrease
Solution Approach 1:
The patent optimizes material parameters including molecular structure, conjugation length, and substituent types to enhance carrier mobility and recombination efficiency, thereby maintaining high luminous efficiency in large-area devices
Solution Approach 2:
The patent develops small-molecule host materials that can be precisely synthesized and optimized for specific performance requirements, enabling efficient large-area OLEDs without relying on expensive or less controllable materials
3Area of stationary object
If the area of display becomes larger, then the coverage and visibility are improved, but the service life decreases
Solution Approach 1:
The patent changes material parameters to improve carrier balance and reduce operational stress on device components, thereby extending service life in large-area OLEDs
Solution Approach 2:
The [5]helicene-based host material acts as an intermediary that facilitates balanced carrier transport and energy distribution across the electroluminescent layer, reducing degradation and extending device lifetime in large-area applications
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 this arylamine compound as a hole transport type host material in organic electroluminescent devices significantly improves efficiency and service life by enhancing carrier utilization and broadening the recombination region of carriers.
Implementation Method 1
the first ring and the fifth benzene ring at the end of [5]helicene are in different planes due to the steric hindrance effect of hydrogen atoms, thus forming spatial planes with a plurality of different included angles within the molecule, which can effectively inhibit stacking between molecules, and improve the film-forming properties of the compounds
Implementation Method 2
the first ring and the fifth benzene ring at the end of [5]helicene are in different planes due to the steric hindrance effect of hydrogen atoms, thus forming spatial planes with a plurality of different included angles within the molecule, which can effectively inhibit stacking between molecules
Implementation Method 3
When a voltage is applied to the cathode and the anode, an electric field is generated between the cathode and the anode, electrons on a cathode side move towards an electroluminescent layer and holes on an anode side also move towards the electroluminescent layer under the action of the electric field, the electrons and the holes are combined in the electroluminescent layer to form excitons, the excitons are in an excited state and release energy outwards, and then the electroluminescent layer emits light outwards
Data Source
AI summary
The disclosure relates to the technical field of organic electroluminescent materials, and provides an arylamine compound, and an organic electroluminescent device and an electronic apparatus thereof. The arylamine compound of the disclosure includes a [5]helicene group, and when the compound is used as a host material of an organic electroluminescent device, the efficiency and the service life of the device can be significantly improved.