Polycyclic Aromatic Compound with Boron Linkage for OLED Host Material
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Solution Overview
Problem
Current organic electroluminescent elements lack materials with diverse chemical structures beyond NO-linked compounds, limiting their electronic properties and manufacturing methods, and polycyclic aromatic compounds with extended conjugated systems are not suitable due to low triplet excitation energy and redox instability.
Innovation Solution
A novel polycyclic aromatic compound with aromatic rings linked via boron, oxygen, or nitrogen atoms is developed, which increases the HOMO-LUMO gap and triplet excitation energy, enabling its use as a material for organic electroluminescent elements with improved redox stability and thermally activated delayed fluorescence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If polycyclic aromatic compounds with extended conjugated systems are used, then redox stability is improved, but triplet excitation energy and HOMO-LUMO gap become too low for suitable host material
Solution Approach 1:
The compound is divided into distinct functional segments: a polycyclic aromatic hydrocarbon core (providing redox stability) and attached aromatic ring groups (providing high triplet excitation energy). This segmentation allows each part to contribute its advantageous properties independently, resolving the contradiction between redox stability and triplet excitation energy
Solution Approach 2:
The invention creates a composite molecular structure combining polycyclic aromatic hydrocarbon units with additional aromatic rings through specific linkages. This composite structure integrates the redox stability of the PAH core with the high triplet energy of the aromatic ring substituents, achieving both properties simultaneously
2Power
If aromatic rings are linked via single bonds or traditional atoms to increase HOMO-LUMO gap, then band gap is improved, but manufacturing complexity increases due to limited linkage methods
Solution Approach 1:
The patent introduces heteroatoms (oxygen, nitrogen, boron) as intermediary linking groups between aromatic rings. These intermediary atoms provide diverse chemical bonding possibilities and enable various manufacturing routes while effectively controlling the HOMO-LUMO gap through their electronic properties
Solution Approach 2:
The invention changes the chemical parameters of the linkage atoms from traditional carbon-based connections to heteroatom-based connections (O, N, B). This parameter change diversifies the manufacturing approaches and allows precise tuning of the HOMO-LUMO gap through selection of different heteroatoms and their positioning
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 polycyclic aromatic compound enhances the energy difference between triplet and singlet excited states, making it suitable for electron and hole transport layers, and allows for optimization of ionization potential and electron affinity, improving the performance of organic electroluminescent elements.
Implementation Method 1
enabling its use as a material for organic electroluminescent elements with improved redox stability and thermally activated delayed fluorescence
Data Source
AI summary
An object is to provide a novel polycyclic aromatic compound and an organic electroluminescent element using the same. By providing a novel polycyclic aromatic compound having a diarylamino group and having a plurality of aromatic rings linked to each other via a boron atom, an oxygen atom, or the like, options of a material for an organic EL element are increased. In addition, by using the novel polycyclic aromatic compound as a material for an organic electroluminescent element, an excellent organic EL element is provided.