Fused Polycyclic Compound Emission Layer for OLED Driving Voltage
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Solution Overview
Problem
Existing organic electroluminescence devices face challenges in reducing driving voltage, enhancing emission efficiency, and increasing device lifespan, while also requiring the development of stable materials that consistently achieve these characteristics.
Innovation Solution
A light emitting device is developed that incorporates a fused polycyclic compound as a light emitting material in the emission layer, which improves the emission efficiency of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic electroluminescence materials are used, then the device structure is simple, but the emission efficiency is low
Solution Approach 1:
The patent employs composite materials by combining the fused polycyclic compound (emissive material) with host materials and dopants in the emission layer. This composite approach enables enhanced emission efficiency through energy transfer mechanisms while maintaining a relatively simple overall device structure, resolving the contradiction between productivity improvement and device complexity.
2Power
If conventional organic electroluminescence materials are used, then the manufacturing process is simple, but the driving voltage is high
Solution Approach 1:
The patent changes the chemical parameters of the emissive material by introducing a fused polycyclic compound with specific molecular structure and electronic properties. This parameter change in the material composition leads to improved electrical characteristics and reduced driving voltage, while the manufacturing process remains relatively simple as it follows conventional organic electroluminescence device fabrication methods.
3Duration of action of stationary object
If conventional organic electroluminescence materials are used, then the device is easy to manufacture, but the device lifespan is short
Solution Approach 1:
The patent uses composite materials in the emission layer, combining the fused polycyclic compound with host materials that provide structural stability and protective functions. This composite structure enhances device lifespan through improved material stability and reduced degradation, while maintaining ease of manufacture by using conventional fabrication processes compatible with the new material system.
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 the fused polycyclic compound in the light emitting device enhances emission efficiency and potentially extends the device's lifespan, while also reducing the driving voltage required.
Implementation Method 1
an organic electroluminescence device... holes and electrons respectively injected from a first electrode and a second electrode recombine in an emission layer so that a light emitting material including an organic compound in the emission layer emits light
Implementation Method 2
delayed fluorescence emission which uses the generating phenomenon of singlet excitons by the collision of triplet excitons (triplet-triplet annihilation, TTA)
Implementation Method 3
development on a material for thermally activated delayed fluorescence (TADF) using delayed fluorescence phenomenon
Data Source
AI summary
A light emitting device according to an embodiment includes a first electrode, a hole transport region disposed on the first electrode, an emission layer disposed on the hole transport region, an electron transport region disposed on the emission layer, and a second electrode disposed on the electron transport region. The emission layer includes a fused polycyclic compound represented by Formula 1, which is defined in the specification.