Heterocyclic Compound Emission Layers for Brighter, Faster OLEDs
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Solution Overview
Problem
Existing organic light-emitting devices face challenges in achieving optimal performance in terms of luminance, driving voltage, and response speed, particularly in producing full-color images with wide viewing angles and high contrast ratios.
Innovation Solution
Incorporation of a heterocyclic compound represented by specific structural formulas, which can be used in the emission layer, hole transport region, and electron transport region of the device, enhancing the device's efficiency and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional organic light-emitting devices are used, then device structure is simple, but luminance and response speed are insufficient
Solution Approach 1:
The patent employs composite material strategy by integrating heterocyclic compounds with specific molecular structures (containing nitrogen, oxygen, or sulfur atoms in ring structures) into the organic light-emitting device layers. These composite materials exhibit enhanced luminance properties while maintaining device structural simplicity, directly resolving the contradiction between improving luminance and avoiding increased device complexity.
Solution Approach 2:
The patent applies parameter changes by modifying the chemical composition parameters of the emission layer through incorporation of heterocyclic compounds with specific structural parameters (ring sizes, heteroatom types, substitution patterns). This changes the optical and electrical parameters of the device to achieve higher luminance without fundamentally altering the device structure, thus resolving the technical contradiction.
2Speed
If conventional organic light-emitting devices are used, then device structure is simple, but response speed is insufficient
Solution Approach 1:
The patent changes the molecular parameter parameters of the organic compounds in the emission layer by introducing heterocyclic structures with specific electronic properties. This modifies the charge carrier mobility and recombination dynamics parameters, thereby improving response speed while keeping the device structure simple and unchanged.
Solution Approach 2:
The use of heterocyclic compound-based composite materials in the emission layer provides enhanced charge transport properties and faster carrier recombination, improving response speed without requiring complex device structural modifications, thus resolving the contradiction between speed improvement and structural simplicity.
3Use of energy by stationary object
If conventional organic light-emitting devices are used, then driving voltage is high, but device structure is simple
Solution Approach 1:
The patent modifies the electrical parameter parameters of the emission layer by incorporating heterocyclic compounds with optimized HOMO-LUMO energy levels and charge mobility. This changes the voltage-current characteristics of the device, reducing driving voltage requirements while maintaining the simple device structure, thus resolving the technical contradiction.
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, reduces driving voltage, and increases response speed, enabling the production of high-quality full-color images with wide viewing angles and high contrast ratios.
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. When the excitons transition from an excited state to a ground state, light is emitted.
Data Source
AI summary
Embodiments provide a heterocyclic compound, an organic light-emitting device including the heterocyclic compound, an electronic apparatus including the organic light-emitting device, and a consumer product including the organic light-emitting device. The organic 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: