Organic Electroluminescent Compound for OLED Luminous Efficiency
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Solution Overview
Problem
The existing organic electroluminescent materials, particularly heat-activated delayed fluorescence (TADF) materials, have limited choices and performance, which hinders their application in organic light-emitting diodes (OLEDs) due to high production costs and limited luminous efficiency.
Innovation Solution
Development of an organic electroluminescent compound with a specific chemical formula that allows for a small energy difference between singlet and triplet excited states, enabling efficient reverse intersystem crossing and TADF properties without the use of expensive metal complexes, thereby improving luminous efficiency and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If existing TADF materials are used, then production cost is reduced compared to phosphorescent materials, but luminous efficiency and performance are limited
Solution Approach 1:
The patent modifies molecular parameters by adjusting the energy gap between S1 and T1 states through systematic changes in molecular structure (different heteroatoms X1-X3, various substituent groups R1-R17), achieving optimal TADF performance with enhanced luminous efficiency while maintaining cost-effectiveness
Solution Approach 2:
The patent creates composite TADF materials by combining electron-donating groups (phenoxazine, phenothiazine, carbazole) with electron-accepting groups (triazine, pyrimidine, pyridine rings), forming push-pull structures that achieve both high luminous efficiency and material diversity
2Loss of energy
If phosphorescent materials are used to achieve high luminous efficiency, then production cost increases due to expensive metal complexes
Solution Approach 1:
The patent replaces expensive phosphorescent metal complexes with organic TADF materials containing common elements (C, H, O, N, S, Si), achieving comparable luminous efficiency through molecular design without requiring rare or expensive metals, thereby reducing production cost
Solution Approach 2:
The patent substitutes the phosphorescence mechanism (requiring heavy metals for triplet state utilization) with TADF mechanism (utilizing reverse intersystem crossing from triplet to singlet state), eliminating the need for expensive metal complexes while maintaining high luminous efficiency
3Use of energy by moving object
If the energy difference between S1 and T1 states is large, then reverse intersystem crossing efficiency is low, but achieving small energy difference requires precise molecular structure control
Solution Approach 1:
The patent systematically adjusts molecular parameters by varying heteroatoms (O, S, Si), substituent groups (alkyl, aryl, heteroaryl), and molecular connectivity to achieve optimal S1-T1 energy gap (0.1-0.5 eV) that enables efficient reverse intersystem crossing while maintaining structural feasibility for synthesis
Solution Approach 2:
The patent introduces localized electron-donating and electron-accepting units within the molecular structure, creating local charge transfer characteristics that facilitate small S1-T1 energy difference and efficient reverse intersystem crossing without requiring complete redesign of the entire molecular framework
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 new organic electroluminescent compound enhances luminous efficiency in OLEDs by facilitating TADF mechanisms, offering a broader range of applications with lower production costs and improved performance compared to existing TADF materials.
Implementation Method 1
enabling efficient reverse intersystem crossing and TADF properties
Implementation Method 2
The organic electroluminescent compound enhances luminous efficiency in OLEDs by facilitating TADF mechanisms
Implementation Method 3
Organic electroluminescent materials play a critical role for the continuous development of OLEDs
Data Source
AI summary
A compound and an organic optoelectronic device are provided. The compound has the following chemical formula (I):chemical formula (I). In the chemical formula (I), X1 to X2 are independently selected from O, S,and substituted or unsubstituted methylene, and a substituent is selected from hydrogen, deuterium, C1 to C30 alkyl, C1 to C30 heteroatom-substituted alkyl, C6 to C30 aryl, and C2 to C30 heteroaryl. X3 is selected from O, S, substituted or unsubstituted methylene, substituted or unsubstituted methylene, and substituted or unsubstituted silylene, and a substituent is selected hydrogen, deuterium, C1 to C30 alkyl, C1 to C30 heteroatom-substituted alkyl, C6 to C30 aryl, and C2 to C30 heteroaryl. R1 to R17 are independently selected from hydrogen, deuterium, C1 to C30 alkyl, C1 to C30 heteroatom-substituted alkyl, C6 to C30 aryl, and C2 to C30 heteroaryl.