Heterocyclic Compound Emission Layer for OLED Efficiency
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Solution Overview
Problem
Current light-emitting devices face limitations in achieving optimal performance in terms of viewing angles, contrast ratios, response times, luminance, and driving voltage due to the lack of effective materials in the emission layer that can efficiently manage carrier recombination and light generation.
Innovation Solution
Incorporation of a heterocyclic compound represented by Formula 1 into the emission layer of a light-emitting device, which includes a specific interlayer structure with hole and electron transport regions, enhancing carrier recombination and light emission efficiency by controlling the Stokes-shift to less than 20 nm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional emission layer materials are used, then device structure is simple, but carrier recombination efficiency and light generation are insufficient
Solution Approach 1:
The patent modifies the molecular structure parameters of emission layer materials by introducing specific heterocyclic compounds with defined chemical formulas (Formula 1 and Formula 2), controlling substituent groups and molecular weights to optimize carrier recombination efficiency and light generation while maintaining manufacturability
Solution Approach 2:
The patent employs composite emission layer structures combining multiple compounds including host materials, guest materials, and heterocyclic compounds with specific functional groups, creating synergistic effects that enhance carrier recombination and light emission efficiency beyond what single materials can achieve
2Illumination intensity
If emission layer materials with high carrier recombination efficiency are used, then luminance improves, but driving voltage increases
Solution Approach 1:
The patent optimizes the local chemical and electronic properties of the emission layer by incorporating heterocyclic compounds with specific functional groups and electron mobility characteristics at strategic positions within the layer, enabling efficient carrier recombination and high luminance while maintaining balanced charge transport that prevents excessive voltage requirements
Solution Approach 2:
The patent adjusts key material parameters including HOMO-LUMO energy levels, electron mobility, and molecular weight of the heterocyclic compounds to achieve an optimal balance between luminance enhancement and driving voltage control, ensuring efficient light generation without excessive energy consumption
3Productivity
If Stokes-shift is reduced to less than 20 nm, then light emission efficiency improves, but material design complexity increases
Solution Approach 1:
The patent achieves minimal Stokes-shift (less than 20 nm) by precisely controlling molecular structural parameters of the heterocyclic compounds, including substituent group types, positions, and configurations, which optimizes the overlap between absorption and emission spectra for enhanced light emission efficiency
Solution Approach 2:
The patent utilizes established heterocyclic compound frameworks and structural motifs from known materials, systematically modifying them with specific substituent groups to achieve the desired minimal Stokes-shift property, thereby reducing material design complexity through借鉴 of proven structural templates
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 heterocyclic compound in the emission layer improves the light-emitting device's performance by achieving balanced carrier injection and efficient light generation, resulting in enhanced luminance and reduced operational voltage, while maintaining wide viewing angles and fast response times.
Implementation Method 1
Holes provided from the first electrode move toward the emission layer through the hole transport region, and electrons provided from the second electrode move toward the emission layer through the electron transport region. Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. These excitons transition from an excited state to a ground state to thereby generate 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 device 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 including an emission layer, and the heterocyclic compound. The heterocyclic compound is represented by Formula 1, which is explained in the specification: