Hexaazatriphenylene Organic Compound for Delayed Fluorescence
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Solution Overview
Problem
Existing organic light-emitting elements face challenges in achieving high luminous efficiency due to limitations in the materials used for light-emitting layers.
Innovation Solution
An organic compound represented by formula [1] is introduced, featuring a hexaazatriphenylene skeleton with electron-withdrawing properties and electron-donating substituents, which reduces the energy gap between singlet and triplet states, facilitating delayed fluorescence and improved luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional organic light-emitting materials are used, then the device can emit light, but the luminous efficiency is insufficient
Solution Approach 1:
The patent modifies the molecular structure of organic light-emitting materials by introducing specific substituents (formulae [2] to [18]) at defined positions (R1 to R6) on the hexaazatriphenylene core, thereby changing the energy gap between singlet and triplet states to enhance delayed fluorescence and improve luminous efficiency
Solution Approach 2:
The patent employs composite material design by combining the electron-withdrawing hexaazatriphenylene skeleton with electron-donating substituents (formulae [2] to [18]), creating a push-pull electronic structure that optimizes charge distribution and enhances luminous efficiency through improved exciton management
2Duration of action of stationary object
If existing light-emitting materials are used, then the device can operate, but the driving durability is limited
Solution Approach 1:
The patent changes the chemical structure parameters of the light-emitting material by defining specific substituent positions and types (formulae [2] to [18]) on the hexaazatriphenylene core, which stabilizes the material against degradation and improves both driving durability and operational reliability
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 the organic compound in organic light-emitting elements results in high luminous efficiency and superior driving durability, with a small energy difference between singlet and triplet states enabling the utilization of triplet excitons for delayed fluorescence.
Implementation Method 1
the energy gap between a singlet state and a triplet state is small, and thus the delayed fluorescence is enhanced
Implementation Method 2
triplet excitons can be utilized for delayed fluorescence emission through reverse intersystem crossing to singlet states
Data Source
AI summary
An organic compound represented by formula [1]:where in formula [1], R1 to R6 are each independently selected from the group consisting of a hydrogen atom, a hydrocarbon group, and other substituents having a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group, at least one of R1 to R6 is one of the other substituents, at least any one of R1 and R2 is a hydrogen atom or a hydrocarbon group, at least any one of R3 and R4 is a hydrogen atom or a hydrocarbon group, and at least any one of R5 and R6 is a hydrogen atom.