Organic Light-Emitting Device with Optimized Compound Layers
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Solution Overview
Problem
Existing organic light-emitting devices face challenges in achieving low driving voltage and high efficiency, which are crucial for improved performance and energy consumption.
Innovation Solution
The organic light-emitting device incorporates specific compounds represented by Formulae 1A, 1B, 1-4, and 1D for the emission layer, and Formulae 2A or 2B for the hole and electron transport regions, optimizing the layer structure to enhance light emission efficiency and reduce driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional organic light-emitting device structures are used, then device functionality is maintained, but driving voltage remains high and efficiency is limited
Solution Approach 1:
The patent applies parameter changes by carefully selecting and optimizing the chemical structure parameters of organic compounds used in different functional layers. Specific compounds with defined molecular structures (Formulae 1A, 1B, 1-4, 1D for emission layer and Formulae 2A, 2B for transport regions) are chosen to achieve optimal HOMO/LUMO energy levels, carrier mobility, and recombination efficiency, thereby reducing driving voltage and improving device performance
Solution Approach 2:
The patent employs composite materials by combining multiple organic compounds with complementary properties in a multi-layer structure. The emission layer combines compounds for efficient exciton generation, while transport regions use compounds optimized for hole or electron transport, creating a composite system where each layer contributes specific functionality to achieve low voltage and high efficiency
2Productivity
If conventional organic light-emitting device structures are used, then device functionality is maintained, but light emission efficiency remains limited
Solution Approach 1:
The patent applies local quality by optimizing each functional layer with compounds specifically designed for that region's requirements. The emission layer uses compounds (Formulae 1A, 1B, 1-4, 1D) optimized for exciton generation and light emission, while transport regions use compounds (Formulae 2A, 2B) optimized for charge carrier transport, creating locally optimized zones that collectively achieve high overall efficiency
Solution Approach 2:
The patent employs composite materials by combining multiple organic compounds with complementary properties in a multi-layer structure. The emission layer combines compounds for efficient exciton generation, while transport regions use compounds optimized for hole or electron transport, creating a composite system where each layer contributes specific functionality to achieve low voltage and high efficiency
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 low driving voltage and high efficiency, leading to improved performance and energy efficiency in organic light-emitting applications.
Implementation Method 1
Carriers (such as holes and electrons) may recombine in the emission layer to produce excitons. These excitons may transition (e.g., radiatively decay) from an excited state to a ground state to thereby generate light.
Data Source
Figure 1~3
Figure 4~5
AI summary
An organic light-emitting device comprising: a first electrode; a second electrode facing the first electrode; an emission layer between the first electrode and the second electrode; a hole transport region between the first electrode and the emission layer; and an electron transport region between the emission layer and the second electrode, wherein the emission layer comprises a first compound represented by one of selected from Formulae 1A to 1E, and at least one selected from the hole transport region and the electron transport region comprises a second compound represented by Formula 2A or 2B: