OLED Emissive Compound Structure for Low-Voltage Long-Life Operation
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Solution Overview
Problem
There is a need for new materials in organic light emitting devices to enhance efficiency, reduce driving voltage, and improve lifetime characteristics.
Innovation Solution
A novel compound with a specific chemical structure, including a triazine-based substituent and a carbazole-based substituent bonded to a benzofurodibenzothiophene or benzothieno-dibenzothiophene core, is used in the organic material layers of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic materials are used in the organic material layer, then the device can operate, but the efficiency is insufficient and lifetime characteristics are poor
Solution Approach 1:
The patent modifies the chemical structure of organic materials by introducing specific substituents (triazine-based and carbazole-based groups) to the benzofurodibenzothiophene core, changing molecular parameters such as charge mobility, HOMO-LUMO energy levels, and molecular packing characteristics. These parameter changes result in improved device efficiency and lifetime characteristics.
Solution Approach 2:
The patent employs composite organic materials combining multiple functional moieties (triazine substituent, carbazole substituent, and benzofurodibenzothiophene core) into a single molecular structure. This composite approach creates materials with synergistic properties that simultaneously enhance efficiency and reliability, resolving the contradiction between the two parameters.
2Power
If conventional organic materials are used, then the device structure can be maintained, but the driving voltage is too high
Solution Approach 1:
The patent changes the electronic parameters of the organic material by incorporating electron-donating carbazole groups and electron-withdrawing triazine groups, which modify the HOMO and LUMO energy levels. This parameter optimization reduces the energy barrier for charge injection and transport, thereby lowering driving voltage despite the increased molecular complexity.
3Productivity
If new materials with complex structures are introduced to improve efficiency, then device performance improves, but manufacturing complexity increases
Solution Approach 1:
The patent divides the organic material into distinct functional segments: the benzofurodibenzothiophene core provides structural stability and charge transport pathways, while the triazine and carbazole substituents provide specific electronic functions. This segmentation allows for modular design and synthesis, facilitating manufacturing despite the overall molecular complexity.
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 compound improves the efficiency, reduces driving voltage, and extends the lifetime of organic light emitting devices by enhancing charge stability compared to conventional materials.
Implementation Method 1
an organic light emitting phenomenon refers to a phenomenon where electrical energy is converted into light energy by using an organic material
Implementation Method 2
when the injected holes and electrons meet each other, an exciton is formed, and light is emitted when the exciton falls to a ground state again
Data Source
AI summary
Provided is a compound of Chemical Formula 1:wherein:X1 to X3 are each independently N or CH, and at least two of X1 to X3 are N,Y is O or S,A is Chemical Formula 2 or 3:each Z is independently CR, or 2 adjacent Zs are C each linked to Chemical Formula 4 to form a fused ring, and the rest are each independently CR;T is O, S, CQ1Q2, or NAr4,Ar1 to Ar4 are each independently a substituted or unsubstituted C6-60 aryl or C2-60 heteroaryl containing one or more of N, O, and S, andL1 and L2 are each independently a single bond or a substituted or unsubstituted C6-60 arylene or C2-60 heteroarylene containing one or more of O, N, Si and S,and an organic light emitting device including the same.