Organometallic Emission Layer for Light-Emitting Device Efficiency
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Solution Overview
Problem
Current light-emitting devices face limitations in achieving high luminescence efficiency and long lifespan due to challenges in the recombination of holes and electrons in the emission layer, leading to suboptimal performance in terms of luminance and response speed.
Innovation Solution
A composition including an organometallic compound represented by Formula 1, a second compound with a π electron-deficient nitrogen-containing cyclic group, and a third compound capable of emitting delayed fluorescence, which are used in the emission layer of a light-emitting device to enhance luminescence efficiency and lifespan by optimizing the recombination process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional emission layers are used in light-emitting devices, then the device structure can be maintained, but luminescence efficiency and lifespan remain limited due to suboptimal charge carrier recombination
Solution Approach 1:
The patent modifies the chemical composition parameters of the emission layer by incorporating specific organometallic compounds with defined ligand structures (Formula 1), nitrogen-containing cyclic groups (Formula 2), and delayed fluorescence compounds (Formula 3). These parameter changes in molecular structure and composition optimize the charge carrier recombination process, simultaneously improving luminescence efficiency and device lifespan without altering the fundamental device architecture.
Solution Approach 2:
The invention creates a composite emission layer material system combining multiple compound types: organometallic compounds (Formula 1) as primary emitters, nitrogen-containing cyclic compounds (Formula 2) as hosts or auxiliary emitters, and delayed fluorescence compounds (Formula 3) for triplet state management. This composite material approach enables synergistic effects that resolve the contradiction between efficiency and lifespan by optimizing both radiative recombination and material stability.
2Illumination intensity
If the emission layer composition is optimized for high luminescence efficiency, then luminance improves, but achieving long lifespan simultaneously becomes challenging due to complex material requirements
Solution Approach 1:
The patent applies local quality by designing the emission layer with specific functional zones at the molecular level: organometallic compounds (Formula 1) provide localized high-efficiency emission centers, nitrogen-containing cyclic compounds (Formula 2) create stable host matrices with specific electronic properties, and delayed fluorescence compounds (Formula 3) address localized triplet state management. This localized functional differentiation achieves high luminance while managing material complexity through defined role assignment.
Solution Approach 2:
The invention implements multi-functionality within the emission layer compounds. The organometallic compounds (Formula 1) serve as primary emitters while also influencing charge transport. The nitrogen-containing cyclic compounds (Formula 2) function as hosts, auxiliary emitters, and stability enhancers. The delayed fluorescence compounds (Formula 3) manage triplet states while contributing to overall emission. This multi-functional design achieves high luminance without proportionally increasing system 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 proposed solution significantly improves luminescence efficiency and extends the lifespan of light-emitting devices by ensuring effective recombination of charge carriers, resulting in enhanced luminance and response speed characteristics.
Implementation Method 1
Holes provided from the first electrode may move toward the emission layer through the hole transport region, and electrons provided from the second electrode may move toward the emission layer through the electron transport region. Carriers, such as holes and electrons, may recombine in such an emission layer to produce excitons. These excitons transition from an excited state to a ground state to thereby generate light.
Data Source
AI summary
Provided are a composition and a light-emitting device including an organometallic compound represented by Formula 1, an electronic apparatus and a consumer product including the light-emitting device. The detailed description of Formula 1 is the same as described in the present specification. Also provided is the organometallic compound represented by Formula 1 below: