Heterocyclic Green Emission Layer for Low-Voltage OLED Luminance
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Solution Overview
Problem
Existing light-emitting devices face challenges in achieving optimal performance in terms of luminance, driving voltage, and response speed, particularly in the production of green light with a maximum emission wavelength in the range of 510 nm to 550 nm.
Innovation Solution
Incorporation of a heterocyclic compound represented by Formula 1 into the emission layer of a light-emitting device, which includes a first electrode, a second electrode, and an interlayer with a hole transport region and an electron transport region, enhancing the emission layer's efficiency and light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional emission layer materials are used, then the device structure is simple, but the luminance and response speed are insufficient
Solution Approach 1:
The emission layer uses a composite system comprising a host compound and a heterocyclic compound (Formula 1) as dopant. The host compound provides the primary emission characteristics while the heterocyclic compound enhances luminescence efficiency and response speed. This composite approach resolves the contradiction by achieving high luminance through material synergy without requiring complex device structural modifications.
Solution Approach 2:
The patent optimizes the molecular structure parameters of the heterocyclic compound (Formula 1) by varying substituents R1-R10, ring structures CY1-CY5, and heteroatom configurations (X1-X3). These parameter changes enable tuning of emission wavelength (510-550 nm green range), luminance efficiency, and response characteristics while maintaining compatibility with standard device architectures.
2Illumination intensity
If high luminance materials are used, then the light output is improved, but the driving voltage increases
Solution Approach 1:
The heterocyclic compound (Formula 1) is designed with specific energy level parameters including HOMO/LUMO gaps and triplet energy levels that are optimized to match the host compound. This parameter optimization enables efficient energy transfer and electroluminescence at reduced driving voltages while maintaining high luminance output in the green spectrum range.
3Speed
If conventional compounds are used in the emission layer, then the manufacturing process is simple, but the response speed is slow
Solution Approach 1:
The heterocyclic compound (Formula 1) incorporates specific molecular structural parameters including rigid aromatic cores, heteroatom placements (X1-X3), and substituent configurations that enhance charge carrier mobility and exciton recombination rates. These parameter optimizations accelerate response speed without complicating the deposition processes, as the compound can be processed using standard vacuum evaporation or solution-based methods.
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 heterocyclic compound improves the luminance and response speed of the light-emitting device, specifically in the production of green light, while maintaining low driving voltage requirements.
Implementation Method 1
Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. The excitons may transition from an excited state to a ground state, thereby generating light.
Data Source
AI summary
Embodiments provide a heterocyclic compound, a light-emitting device including the heterocyclic compound, an electronic apparatus including the light-emitting device, and an electronic equipment including the light-emitting device. The light-emitting device includes a first electrode, a second electrode facing the first electrode, an interlayer between the first electrode and the second electrode, and the heterocyclic compound. The heterocyclic compound is represented by Formula 1, which is explained in the specification: