OLED Mixed Layer with Anthracene and Amine Compounds
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Solution Overview
Problem
Current organic light-emitting devices face challenges in balancing electron and hole transport, leading to reduced efficiency and lifespan, along with higher driving voltage due to the lack of effective compounds with both electron and hole transportability.
Innovation Solution
Incorporating a mixed layer with a combination of an anthracene-based compound and an amine-based compound, where the anthracene-based compound provides excellent electron transportability and the amine-based compound enhances hole transportability, creating a balanced layer that improves efficiency and lifespan while maintaining low driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic light-emitting devices use separate electron transport and hole transport regions, then device structure is simplified, but the balance between electron and hole transport deteriorates leading to reduced efficiency and lifespan
Solution Approach 1:
The patent merges electron transport and hole transport functions into a single mixed layer by combining an anthracene-based compound (providing electron transport capability) and an amine-based compound (providing hole transport capability). This unified approach allows both electron and hole transport to occur simultaneously within the same layer, improving transport balance and device reliability without requiring separate transport regions.
Solution Approach 2:
The patent uses a composite material system consisting of two different organic compounds with complementary transport properties. The anthracene-based compound contributes electron transportability while the amine-based compound contributes hole transportability, creating a composite layer that achieves balanced dual-carrier transport within a single material system.
2Productivity
If conventional devices lack compounds with both electron and hole transportability, then material selection is easier, but efficiency and lifespan are reduced due to unbalanced carrier transport
Solution Approach 1:
The mixed layer achieves multi-functionality by enabling both electron transport and hole transport within the same layer. The anthracene-based compound provides electron transport capability while the amine-based compound provides hole transport capability, allowing the single mixed layer to perform multiple transport functions that traditionally required separate regions.
3Power
If devices use traditional single-layer structures, then manufacturing is simpler, but driving voltage increases due to unbalanced carrier transport
Solution Approach 1:
The patent changes the chemical composition parameters of the organic layer by selecting specific compounds with appropriate energy levels and transport properties. The anthracene-based compound and amine-based compound are chosen to have complementary HOMO and LUMO levels that facilitate balanced carrier transport, thereby reducing the energy barrier and driving voltage required for device operation.
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 a mixed layer with these compounds improves the balance between electrons and holes, enhancing the efficiency and lifespan of the organic light-emitting device while reducing driving voltage.
Implementation Method 1
the first compound includes an anthracene-based compound represented by Formula 1... wherein the first compound provides excellent electron transportability
Implementation Method 2
the second compound includes an amine-based compound represented by Formula 2... wherein the amine-based compound enhances hole transportability
Implementation Method 3
Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. These excitons transit (e.g., transition or relax) from an excited state to a ground state, thereby generating light
Data Source
AI summary
An organic light-emitting device includes: a first electrode; a second electrode; and an organic layer between the first electrode and the second electrode, wherein the organic layer comprises an emission layer, a mixed layer, and a hole transport region, the hole transport region is between the emission layer and the first electrode, the mixed layer is between the hole transport region and the emission layer, and comprises a first compound and a second compound, the first compound comprises an anthracene-based compound represented by Formula 1, and the second compound comprises an amine-based compound represented by Formula 2. A display apparatus includes the organic light-emitting device.