Carbazole-Triazine Organic Compound for OLED Efficiency and Lifespan
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Solution Overview
Problem
Current organic light emitting diodes (OLEDs) face challenges in achieving high luminous efficiency and long luminous lifespan due to the limitations of existing fluorescent and phosphorescent materials, particularly the short lifespan of metal complexes used in phosphorescent materials.
Innovation Solution
An organic compound with a specific structure, including a carbazolyl moiety linked to a triazine moiety fused with alicyclic or hetero alicyclic rings, is developed. This compound enhances electron donor properties, allows for exciton generation through both Intersystem Crossing (ISC) and Reverse Intersystem Crossing (RISC), and includes a blocking moiety to maintain high triplet energy levels and bipolar properties, improving luminous efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If phosphorescent material (metal complexes) is used to improve luminous efficiency, then luminous efficiency is improved, but luminous lifespan becomes short
Solution Approach 1:
The patent changes the chemical composition parameters by using purely organic compounds instead of metal complexes, specifically designing molecules with carbazole donor units and triazine acceptor units to achieve delayed fluorescence without relying on heavy metal atoms, thus resolving the contradiction between luminous efficiency and lifespan
Solution Approach 2:
The patent creates composite molecular structures by combining electron-donating carbazole moieties with electron-accepting triazine moieties in a single organic molecule, forming a push-pull system that enables both high luminous efficiency and long lifespan through intramolecular charge transfer and delayed fluorescence mechanisms
2Device complexity
If fluorescent material is used to simplify material structure, then material structure is simple, but luminous efficiency becomes low
Solution Approach 1:
The patent changes the photophysical parameters by engineering organic molecules with specific HOMO-LUMO energy level differences and introducing heavy atom-free delayed fluorescence mechanisms, allowing the material to utilize both singlet and triplet excitons while maintaining structural simplicity compared to metal complexes
Solution Approach 2:
The patent replaces expensive and unstable metal complex phosphors with simpler, more stable organic compounds that achieve comparable or superior performance through molecular design, effectively using simpler organic structures to replace complex inorganic materials
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 organic compound significantly enhances the luminous efficiency and lifespan of OLEDs by converting non-emissive triplet excitons to singlet excitons, maintaining high energy levels, and preventing degradation, resulting in improved performance and stability of the OLEDs.
Implementation Method 1
allows for exciton generation through both Intersystem Crossing (ISC) and Reverse Intersystem Crossing (RISC)
Implementation Method 2
allows for exciton generation through both Intersystem Crossing (ISC) and Reverse Intersystem Crossing (RISC)
Implementation Method 3
an organic light emitting diode, including: a first electrode; a second electrode facing the first electrode; and an emissive layer disposed between the first electrode and the second electrode
Data Source
AI summary
The present disclosure relates to an organic compound including at least one carbazolyl moiety fused with an alicyclic or hetero alicyclic ring and linked to directly or via a linker to a triazine moiety and at least one blocking moiety linked the triazine moiety, an organic light emitting diode and an organic light emitting device including the organic compound. The organic compound can implement high luminous efficiency as enhancing delayed fluorescent property, minimize reduction of the luminous lifespan caused by substituent degradation, and can secure high triplet energy level owing to no conjugation extensions. The organic light emitting diode and the organic light emitting device using the organic compound can have beneficial luminous efficiency and the luminous lifespan.