Light-Emitting Device Heterocyclic Interlayers for Luminance and Stability
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Solution Overview
Problem
Existing light-emitting devices face challenges in achieving high efficiency and stability in light emission, particularly in terms of luminance, driving voltage, and response speed, while maintaining wide viewing angles and high contrast ratios.
Innovation Solution
Incorporation of a heterocyclic compound represented by Formula 1 into the interlayer of a light-emitting device, which includes a first and second electrode, and an emission layer, with specific configurations of hole and electron transport regions to enhance light emission properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light-emitting devices are used, then basic light emission is achieved, but luminance, driving voltage, and response speed are insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of the emission layer through the introduction of heterocyclic compounds with specific functional groups (X1, X2, Y1, Y2 representing O, S, Se, N, C=O, etc.). This structural parameter change in the organic compound enables improved luminance, driving voltage, and response speed while maintaining stability, directly resolving the technical contradiction between performance enhancement and emission stability.
2Speed
If existing emission layer materials are used, then light emission is achieved, but response speed is limited
Solution Approach 1:
The patent employs composite materials by creating an emission layer composed of heterocyclic compounds with specific functional group combinations (X1, X2, Y1, Y2) that work synergistically. This composite molecular structure achieves both fast response speed and high energy efficiency by optimizing the electronic properties and charge transport characteristics of the emission layer materials.
3Adaptability or versatility
If standard light-emitting device structure is used, then device functionality is achieved, but viewing angle and contrast ratio are compromised
Solution Approach 1:
The patent applies local quality by designing heterocyclic compounds with specific functional groups positioned at different locations (X1, X2, Y1, Y2) within the molecular structure. Each functional group contributes different properties that collectively achieve wide viewing angles while maintaining high contrast ratio, optimizing the local chemical environment for enhanced display performance.
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, driving voltage, and response speed of the light-emitting device, while maintaining wide viewing angles and high contrast ratios, with potential for efficient blue, green, or red light emission.
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 the 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 that includes the light-emitting device, and an electronic device that includes 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.