Organic Electroluminescent Compound Ligand Design for Luminescent Efficiency
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Solution Overview
Problem
Current organic electroluminescent devices face challenges in achieving high luminescent efficiency due to limitations in the performance of phosphorescent light-emitting materials used in OLEDs.
Innovation Solution
An organic electroluminescent compound comprising a specific ligand L1 coordinated to a metal with an atomic number greater than 40, such as iridium, osmium, or platinum, is developed to enhance luminescent efficiency in OLEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional phosphorescent light-emitting materials are used in OLEDs, then the device structure can be maintained, but luminescent efficiency is insufficient
Solution Approach 1:
The patent modifies the chemical structure parameters of the phosphorescent ligand by introducing specific substituents (R1-R6) at defined positions on the aromatic rings, changing the electronic properties and steric configuration to achieve higher quantum efficiency and luminescent efficiency while maintaining device structure
Solution Approach 2:
The patent creates a composite phosphorescent material by coordinating the designed organic ligand (formula 1) with a metal center (atomic number > 40, such as Ir, Pt, or Os), forming a metal-complex phosphorescent emitter that combines the benefits of organic structure design with metal-based phosphorescence for enhanced performance
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 provides an organic electroluminescent device with improved luminescent efficiency, as demonstrated by higher photoluminescence quantum yield compared to conventional materials, indicating superior quantum efficiency and charge balance.
Implementation Method 1
An organic electroluminescent device (OLED) changes electric energy into light by applying electricity to an organic electroluminescent material
Implementation Method 2
The organic light-emitting compound moves into an excited state by the energy and emits light from an energy when the organic light-emitting compound returns to the ground state from the excited state
Data Source
AI summary
The present disclosure relates to an organic electroluminescent compound comprising a ligand represented by formula 1, and an organic electroluminescent device comprising the same. The organic electroluminescent device having a luminescent efficiency higher than a conventional organic electroluminescent device can be provided by comprising the organic electroluminescent compound of the present disclosure.