Delayed Fluorescent Compound Structure for Practical OLED Efficiency
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Solution Overview
Problem
Existing delayed fluorescent materials for organic electroluminescent devices lack a generalizable chemical structure with superior properties for practical use, limiting light emission efficiency improvements.
Innovation Solution
A compound represented by a specific general formula with defined substituents and bonding configurations, including donor and heteroaryl groups, is developed to enhance delayed fluorescence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a delayed fluorescent material is used to improve light emission efficiency, then the light emission efficiency is improved, but the material lacks practical usability due to insufficient characteristics
Solution Approach 1:
The patent modifies molecular parameters by introducing deuterium atoms at specific positions (R1-R6) of the carbazole-based delayed fluorescent material structure. This parameter change optimizes the balance between light emission efficiency and material stability, resolving the contradiction by achieving both high efficiency and practical usability through controlled structural modification
Solution Approach 2:
The patent creates a composite molecular structure combining carbazole donor groups with specific heteroaryl acceptor groups (triazine, pyridine, pyrimidine rings) and deuterium substitution. This composite approach integrates multiple functional elements to simultaneously achieve high light emission efficiency and improved material characteristics for practical application
2Reliability
If various delayed fluorescent materials are developed through trial and error, then some materials with improved characteristics are discovered, but it is not easy to generalize the chemical structure of useful light-emitting materials
Solution Approach 1:
The patent establishes a universal chemical structure (Formula 1) with carbazole core and defined substituent patterns that can be systematically modified. This universal framework allows generalization of useful chemical structures while maintaining improved material characteristics, reducing the need for continuous trial and error by providing a reliable design template
Solution Approach 2:
The patent applies local quality modification by specifying particular substituent groups at particular positions (R1-R6) of the molecular structure. This localized optimization approach enables systematic generalization of successful structural features while maintaining the ability to tune specific properties, resolving the contradiction between material improvement and structural generalization
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 exhibits excellent light emission characteristics, making it suitable for organic light-emitting devices with improved efficiency and practical applicability.
Implementation Method 1
in an excited state, after having undergone reverse intersystem crossing from an excited triplet state to an excited singlet state, emits fluorescence when returning back from the excited singlet state to a ground state
Implementation Method 2
emits fluorescence when returning back from the excited singlet state to a ground state
Implementation Method 3
in the case where a light-emitting compound is excited through carrier injection thereinto
Data Source
AI summary
When a compound represented by the following general formula is used, an organic light-emitting device having excellent characteristics can be provided. One or more of R1 to R5 represent a cyano group, and two or more represent a donor group; X1 to X3 represent N or C(R); R represents H, D, or a substituent; one or more of Ar1 and Ar2 represent a group bonding via a benzene ring that has a donor group bonding via a nitrogen atom; and L1 represents a single bond or a linking group.