Organic Electroluminescent Material for OLEDs
Find Innovative SolutionsGenerate Solutions
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 a new organic electroluminescent material with a specific chemical formula that enables a small energy difference between singlet and triplet excited states, facilitating a heat activated delayed fluorescence mechanism, and is synthesized without expensive metal complexes, thus reducing manufacturing costs and improving luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
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 specific structural design (electron-donating and electron-withdrawing groups), enabling efficient reverse intersystem crossing while maintaining organic material composition, thus achieving high luminous efficiency without expensive metals
Solution Approach 2:
The patent creates composite TADF materials combining specific donor and acceptor moieties (e.g., carbazole/diphenylamine donors with triazine/benzodiazepine acceptors) to achieve synergistic effects that simultaneously improve luminous efficiency and maintain cost-effectiveness
2Productivity
If phosphorescent materials are used to improve luminous efficiency, then performance is enhanced, but production cost increases due to expensive metal complexes
Solution Approach 1:
The patent replaces expensive, rare metal complexes (Ir, Pt) with inexpensive organic molecules that can achieve comparable or superior performance through TADF mechanism, eliminating the need for costly precious metals while maintaining high luminous efficiency
Solution Approach 2:
The patent changes the fundamental mechanism from phosphorescence (requiring heavy metals) to TADF (using organic molecules with small S1-T1 energy gaps), thereby eliminating expensive materials while achieving high efficiency through optimized molecular parameters
3Productivity
If the energy difference between S1 and T1 states is reduced to enable efficient reverse intersystem crossing, then luminous efficiency is improved, but material design complexity increases
Solution Approach 1:
The patent divides the molecule into distinct functional segments (electron-donating groups and electron-withdrawing groups) that can be independently optimized and combined, simplifying the design process while achieving the required small S1-T1 energy gap for efficient TADF
Solution Approach 2:
The patent applies different electronic characteristics to different parts of the molecule (donor regions with electron-rich characteristics and acceptor regions with electron-deficient characteristics), enabling precise control over energy levels and facilitating efficient reverse intersystem crossing through localized electronic properties
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 material exhibits enhanced luminous efficiency and reduced production costs, expanding the application scope of TADF materials in OLEDs by enabling efficient reverse intersystem crossing and improved performance in organic optoelectronic devices.
Implementation Method 1
The organic electroluminescent materials can be excited to generate singlet excited state (S1) excitons and triplet excited state (T1) excitons
Implementation Method 2
heat activated delayed fluorescence (TADF) materials
Data Source
AI summary
A compound and an organic optoelectronic device are provided. The compound has the following chemical formula (I):wherein: in the chemical formula (I), R1 to R10 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, X1 to X6 are independently selected from C and N, when N is selected, N does not include a substituent, and when C is selected, C includes a substituent selected from hydrogen, deuterium, C1 to C30 alkyl, C1 to C30 heteroatom-substituted alkyl, C6 to C30 aryl, and C2 to C30 heteroaryl, at least one of X1 to X3 and at least one of X4 to X6 are selected as C and, meanwhile, connected to A1 and A2, respectively, and A1 and A2 are chemical groups independently represented by the following chemical formula (II):