Phenanthrene Compounds for OLED Hole Transport
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Solution Overview
Problem
Current hole-transport materials for OLEDs face challenges in achieving improved performance metrics such as efficiency, lifetime, and operating voltage, particularly due to increased voltage with thicker layers, and there is a need for novel materials with high charge-carrier mobility and thermal stability.
Innovation Solution
Development of specific organic compounds with a phenanthrene structure, substituted with aromatic or heteroaromatic groups, which serve as hole-transport, hole-injection, or light-emitting materials, offering high mobility and stability, and can be used in various layers of OLEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the layer thickness of the hole-transport layer is increased to improve performance, then the coverage and transport capability are improved, but the operating voltage increases significantly
Solution Approach 1:
The patent changes the chemical structure parameters of the hole-transport material by introducing specific substituents (arylamine groups, carbazole groups, dibenzofuran groups) at defined positions on the phenanthrene core. This molecular-level parameter change results in improved charge-carrier mobility, allowing thicker layers to be used without proportionally increasing operating voltage.
Solution Approach 2:
The patent creates composite molecular structures by combining phenanthrene core with multiple functional groups (arylamine, carbazole, dibenzofuran). This composite approach at the molecular level produces materials with synergistic properties that simultaneously achieve high hole-transport efficiency and acceptable operating voltages in thicker layers.
2Device complexity
If conventional hole-transport materials are used, then the device structure is simple, but the charge-carrier mobility is insufficient for thick layers
Solution Approach 1:
The patent applies local quality by placing specific functional groups (arylamine at position 3, carbazole at position 9, dibenzofuran at position 2) at defined locations on the phenanthrene molecule. Each substituent provides localized functional properties that collectively enhance overall charge-carrier mobility while maintaining a relatively simple core structure.
3Duration of action of stationary object
If the OLED lifetime is extended through material optimization, then the operational duration increases, but the development complexity and material optimization requirements increase
Solution Approach 1:
The patent systematically varies molecular parameters (substituent types, positions, and combinations) to optimize both lifetime and efficiency. The specific structural parameters defined in formula (1) represent optimized values that simultaneously achieve extended lifetime, high efficiency, and acceptable operating voltages.
Data Source
AI summary
The invention relates to specific phenanthrenes, the use of the compound in an electronic device, and an electronic device containing at least one of said compounds. The invention further relates to a method for producing the compound and a formulation and composition containing one or more of the compounds.