Light-Emitting Device Electron Transport Region Segmentation
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Solution Overview
Problem
Existing organic light-emitting devices face challenges in achieving low driving voltage and high luminescence efficiency while maintaining a long lifespan, due to limitations in electron injection and charge balance.
Innovation Solution
A light-emitting device structure incorporating a compound represented by Formula 1 in the emission layer and a first metal-containing compound and a second metal in the electron transport region, which enhances electron injection and charge balance, improving luminescence efficiency and reducing driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electron transport materials are used in the electron transport region, then the device structure is simple, but the electron injection is insufficient and charge balance is poor, resulting in high driving voltage and low luminescence efficiency
Solution Approach 1:
The electron transport region employs a composite structure comprising a first electron transport layer with a first electron transport material and a second electron transport layer with a second electron transport material. This composite material approach enables synergistic electron injection and charge balance improvement, achieving high luminescence efficiency while maintaining a manageable device structure.
2Reliability
If conventional emission layer compounds are used, then the manufacturing process is simple, but the charge balance is insufficient, leading to high driving voltage and reduced lifespan
Solution Approach 1:
The emission layer utilizes a composite compound structure represented by Formula 1, which integrates specific molecular components that work synergistically. This composite emission layer compound improves charge balance and extends device lifespan while keeping the manufacturing process feasible through established organic light-emitting device fabrication methods.
3Power
If the electron transport region lacks optimized electron injection, then the device structure remains simple, but electron injection is insufficient, resulting in high driving voltage
Solution Approach 1:
The electron transport region is segmented into two distinct electron transport layers, each with different electron transport materials. This segmentation allows each layer to be optimized for specific electron injection functions, improving overall electron injection efficiency and reducing driving voltage while maintaining structural organization.
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 proposed structure achieves low driving voltage and high luminescence efficiency by improving electron injection and charge balance, leading to a longer lifespan and better performance of the light-emitting device.
Implementation Method 1
Organic light-emitting devices are self-emissive light-emitting devices... Carriers, (such as the holes and electrons), may recombine in the emission layer to produce excitons. These excitons may transition from an excited state to the ground state to thereby generate light.
Data Source
AI summary
An electronic apparatus includes a light-emitting device. The light-emitting device includes a first electrode, a second electrode facing the first electrode, and an interlayer including an emission layer between the first electrode and the second electrode and an electron transport region between the emission layer and the second electrode, wherein the emission layer includes a compound represented by Formula 1, and the electron transport region includes a first metal-containing compound and a second metal: