Light-Emitting Device Emission Layer for Efficiency and Lifespan
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Solution Overview
Problem
Existing light-emitting devices face challenges in achieving high emission efficiency and lifespan properties.
Innovation Solution
A light-emitting device is designed with a specific interlayer structure comprising a host, a first dopant, and a second dopant, where the host includes a compound represented by Formula 1, and the device satisfies Relationship Equation 1, enhancing emission efficiency and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional host materials and dopant configurations are used in light-emitting devices, then device structure and materials are simpler, but emission efficiency and lifespan are insufficient
Solution Approach 1:
The patent applies parameter changes by carefully selecting and optimizing the energy level parameters of the host material (Formula 1 compound) and dopants to satisfy specific relationships (S1(H)≥S1(D2)≥T1(H)≥T1(D1)≥T1(D2)). This energy level parameter optimization enables efficient exciton management and light emission while maintaining a relatively simple three-component emission layer structure, thus resolving the contradiction between emission efficiency and structural complexity.
Solution Approach 2:
The patent employs composite materials by combining a host material (Formula 1 compound with specific heterocyclic groups) with two different dopants in the emission layer. This composite material approach creates synergistic effects where the host provides the energy level framework and the dopants contribute to efficient exciton utilization and light emission, achieving high emission efficiency without excessive structural complexity.
2Duration of action of stationary object
If conventional host materials and dopant configurations are used in light-emitting devices, then device structure and materials are simpler, but lifespan properties are insufficient
Solution Approach 1:
The patent extends device lifespan through parameter changes by optimizing the energy level relationships between host and dopants. The specific energy level configuration (S1(H)≥S1(D2)≥T1(H)≥T1(D1)≥T1(D2)) prevents harmful exciton accumulation and degradation pathways, thereby extending device operational lifetime while maintaining a manageable emission layer structure comprising host, first dopant, and second dopant.
3Productivity
If energy levels are optimized to improve emission efficiency, then emission efficiency increases, but device structure becomes more complex
Solution Approach 1:
The patent systematically applies parameter changes by establishing specific energy level relationships (S1(H)≥S1(D2)≥T1(H)≥T1(D1)≥T1(D2)) between the host material and two dopants. This parameter optimization strategy maximizes emission efficiency through efficient exciton management while the complexity is contained within the material selection rather than structural design, as the emission layer maintains a straightforward three-component architecture.
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 device achieves improved emission efficiency and extended lifespan through the use of a compound host and dopant configuration that optimizes energy levels and emission properties.
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, 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
Provided are a light-emitting device and an electronic apparatus including the same. The light-emitting device includes a first electrode, a second electrode facing the first electrode, and an interlayer disposed between the first electrode and the second electrode. The interlayer includes an emission layer, the emission layer includes a host, a first dopant, and a second dopant, the host, the first dopant, and the second dopant are different from each other, the host includes a compound represented by Formula 1 below, and the light-emitting device satisfies Relationship Equation 1:S1(H)≥S1(D2)≥T1(H)≥T1(D1)≥T1(D2) [Relationship Equation 1]Formula 1 and Relationship Equation 1 are as described in the specification.