Iridium Organic Metal Compound for Efficient Long-Life OLED Emission
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Solution Overview
Problem
Existing organic light emitting diodes (OLEDs) face challenges with low luminous efficiency and short luminous lifespan, particularly in metal complexes used as phosphorescent materials.
Innovation Solution
An organic metal compound with a specific structure, including a hetero aromatic ligand and bidentate ligands, is introduced into the emissive layer of the OLED, enhancing luminous efficiency and lifespan by maintaining a rigid chemical conformation and controlling emission colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If phosphorescent metal complex material is used in OLED, then luminous efficiency is improved, but luminous lifespan becomes short
Solution Approach 1:
The patent modifies the chemical structure parameters of the phosphorescent material by introducing specific ligand configurations (Formula 1 structure with LA and LB ligands) and substituent groups (R1-R6) to optimize both luminous efficiency and lifespan. This structural parameter change resolves the contradiction by creating a metal complex that maintains high efficiency while extending operational duration.
Solution Approach 2:
The invention creates a composite phosphorescent material combining iridium metal center with specifically designed organic ligands (LA and LB) in a heteroleptic complex structure. This composite approach integrates the high efficiency of phosphorescent materials with structural features that enhance stability and lifespan, overcoming the limitation of conventional metal complexes.
2Device complexity
If fluorescent material is used in OLED, then structure is simple, but luminous efficiency becomes low
Solution Approach 1:
The patent introduces phosphorescent metal complex material as an intermediary substance in the emissive layer that enables triplet exciton utilization. This intermediary material bridges the gap between simple fluorescent structures and high efficiency requirements, allowing the system to achieve high luminous efficiency through phosphorescence while maintaining manageable structural complexity.
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 metal compound improves luminous efficiency and extends the lifespan of OLEDs, enabling reduced driving voltage and improved color purity.
Implementation Method 1
phosphorescent material can show high luminous efficiency since it uses triplet exciton energy as well as singlet exciton energy in the luminous process
Data Source
AI summary
The present disclosure relates to an organic metal compound having the following structure of Formula 1, an organic light emitting diode (OLED) and an organic light emitting device that includes the organic metal compound. The OLED and the organic light emitting device including the organic metal compound can improve their luminous efficiency, luminous color purity and lifespan.Ir(LA)m(LB)n [Formula 1]