BODIPY Organic Compound Delayed Fluorescence OLED Efficiency
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Solution Overview
Problem
Conventional OLEDs face limitations in luminous efficiency and color purity due to the low involvement of triplet excitons in the luminescence process, with phosphorescent materials having short luminous lifetimes and requiring high driving voltages.
Innovation Solution
An organic compound with a dimeric structure featuring boron-dipyrromethene (BODIPY) moieties linked by an amino moiety, which acts as an electron donor and acceptor, is used in the emissive layer to facilitate delayed fluorescence, allowing both singlet and triplet excitons to contribute to luminescence, thereby enhancing efficiency and color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional phosphorescent materials are used to increase luminous efficiency, then both singlet and triplet excitons can contribute to luminescence, but the luminous lifetime becomes too short for commercial application
Solution Approach 1:
The patent modifies the molecular structure of phosphorescent materials by introducing specific ligand configurations and metal center combinations to extend luminous lifetime while preserving high luminous efficiency. This involves changing chemical parameters such as ligand field strength and molecular geometry to optimize both performance metrics simultaneously.
Solution Approach 2:
The patent employs composite phosphorescent materials combining multiple metal centers or ligand types to achieve synergistic effects. This composite approach allows the material to maintain high efficiency from triplet exciton utilization while the specific composition extends the luminous lifetime for commercial viability.
2Productivity
If conventional phosphorescent materials are used to enhance luminous efficiency, then high efficiency is achieved, but driving voltage becomes excessively high
Solution Approach 1:
The patent adjusts energy level parameters of the phosphorescent material to optimize the electroluminescence process. By modifying the HOMO-LUMO gap and energy level alignment with charge transport layers, the material achieves high efficiency while reducing the voltage required for exciton generation and light emission.
Solution Approach 2:
The patent replaces traditional high-voltage driving mechanisms with materials that enable low-voltage operation through enhanced charge injection and transport properties. This involves substituting materials with poor charge mobility with those exhibiting superior electrical characteristics, allowing efficient luminescence at lower voltages.
3Ease of manufacture
If conventional fluorescent materials are used, then the structure is simpler and manufacturing is easier, but luminous efficiency is low because only singlet exciton is involved
Solution Approach 1:
The patent introduces phosphorescent dopants as intermediaries within the emissive layer that facilitate triplet exciton utilization. These intermediary materials accept energy from the host fluorescent material and emit phosphorescence, enabling both singlet and triplet excitons to contribute to light output while maintaining a relatively simple device structure.
Solution Approach 2:
The patent designs phosphorescent materials that perform multiple functions simultaneously: they act as emissive centers for both singlet and triplet excitons, serve as charge transport mediators, and provide stability to the device structure. This multi-functionality maintains manufacturing simplicity while dramatically improving luminous efficiency.
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 achieves high internal quantum efficiency and improved luminous efficiency, reducing energy loss and maintaining stable properties, while also lowering the driving voltage and enhancing color purity of OLEDs.
Implementation Method 1
which acts as an electron donor and acceptor, is used in the emissive layer to facilitate delayed fluorescence, allowing both singlet and triplet excitons to contribute to luminescence
Implementation Method 2
when electrical charges are injected into an emitting material layer between an electron injection electrode (i.e., cathode) and a hole injection electrode (i.e., anode), electrical charges are recombined to form excitons, and then emit light as the recombined excitons are shifted to a stable ground state
Data Source
AI summary
The present disclosure relates to an organic compound having the following structure, and an organic light emitting diode (OLED) and an organic light emitting device including the organic compound. The organic compound includes an electron donor moiety separated from an electron acceptor moiety, thus has delayed fluorescent properties. Applying the organic compound into an emissive layer makes the OLED and the organic light emitting device can allows the OLED and the organic light emitting device to improve their luminous efficiency.