Iridium Metal Complex Ligand Design for Low Driving Voltage OLEDs
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Solution Overview
Problem
Light emitting devices using certain metal complexes exhibit high driving voltage, which is a suboptimal performance characteristic.
Innovation Solution
A metal complex represented by a specific formula, comprising an iridium or platinum atom with defined ligand configurations and substituents, is developed to enhance the driving voltage efficiency, along with a composition and light emitting device utilizing this complex.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional metal complexes are used in light emitting devices, then light emission from triplet excited state is achieved, but driving voltage becomes excessively high
Solution Approach 1:
The patent modifies the chemical structure parameters of the metal complex by introducing specific ligand configurations (formula 1 with defined n1, n2 values and specific ring structures), which changes the electronic properties and energy levels of the complex, thereby reducing the driving voltage while maintaining light emission efficiency
Solution Approach 2:
The patent creates a composite light emitting system by combining the metal complex with specific host materials and encapsulating it in a light emitting device structure with multiple functional layers, optimizing the overall system performance to achieve low driving voltage and high 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 metal complex improves the driving voltage performance of light emitting devices, offering better stability and external quantum yield, and is suitable for various light emission colors.
Implementation Method 1
phosphorescent compounds showing light emission from the triplet excited state
Data Source
AI summary
A metal complex is represented by the formula (1):In formula (1), M represents Ir or Pt, n1 represents 1 to 3, n2 represents 0 to 2, A1-G1-A2 represents an anionic bidentate ligand, m1 and m2 represent 3 or 4, E1 to E4 represent a nitrogen atom or a carbon atom, R1 and R2 represent a substituent, R1 and/or R2 is represented by formula (2-1) or formula (2-2), Ring A represents an aromatic heterocyclic ring, Ring B represents an aromatic hydrocarbon ring or an aromatic heterocyclic ring, and R3, R3a, R4a, R5 and R6 represent a substituent: