Organometallic Compound for Red Light Emission in OLEDs
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Solution Overview
Problem
Current organic light-emitting devices face limitations in achieving high external quantum efficiency and low driving voltage, particularly in emitting red light or near-infrared light with optimal emission wavelengths.
Innovation Solution
Incorporating an organometallic compound represented by Formula 1, which includes specific transition metals and ligands, into the organic layer of the device to enhance emission properties, allowing for the production of red light or near-infrared light with a maximum emission wavelength of 720 nm or more, while maintaining low driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic light-emitting devices are used, then device structure is simple, but external quantum efficiency is low and driving voltage is high
Solution Approach 1:
The patent changes the chemical composition parameters of the emission layer by incorporating organometallic compounds with specific ligands (Formula 1-1) and metal centers (Formula 1), which fundamentally alters the electroluminescence properties to achieve high external quantum efficiency while maintaining low driving voltage
Solution Approach 2:
The patent creates a composite emission layer combining conventional organic materials with organometallic compounds, where the metal complex (M1(L1)n1(L2)n2) acts as a dopant or active species within the organic host matrix, synergistically improving efficiency and reducing voltage requirements
2Illumination intensity
If conventional organic light-emitting devices are used, then device structure is simple, but emission wavelength in red to near-infrared range (720 nm or more) cannot be achieved
Solution Approach 1:
The patent changes the optical emission parameters by selecting organometallic compounds with specific ligand fields and metal centers that produce characteristic emission wavelengths of 720 nm or more in the red to near-infrared region, overcoming the limitations of conventional organic materials
Solution Approach 2:
The organometallic compound acts as an intermediary species that facilitates long-wavelength emission through its unique d-orbital electronic transitions, bridging the gap between conventional organic materials and the desired red/near-infrared emission range
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 use of the organometallic compound in the organic light-emitting device results in improved external quantum efficiency and reduced driving voltage, enabling effective emission of red or near-infrared light within the desired spectral range.
Implementation Method 1
Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. These excitons transit (e.g., transition or relax) from an excited state to a ground state, thereby generating light.
Data Source
AI summary
Provided are an organic light-emitting device, an apparatus including the same, and an organometallic compound represented by Formula 1. The organic light-emitting device includes: a first electrode; a second electrode; and an organic layer between the first electrode and the second electrode and including an emission layer. The organic layer includes an organometallic compound represented by Formula 1.