Polycyclic Compound Emission Layer for Low Voltage OLEDs
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Solution Overview
Problem
Current light emitting elements for organic electroluminescence display devices face challenges in achieving low driving voltage, high luminous efficiency, and long service life, which are essential for stable and efficient image display.
Innovation Solution
A light emitting element is designed with a polycyclic compound represented by Formula 1, incorporated into the emission layer, hole transport region, and electron transport region, which improves the driving voltage characteristic and luminous efficiency, and is capable of emitting light in the blue wavelength region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional materials are used in the emission layer, then the device structure is simple, but the driving voltage is high and luminous efficiency is low
Solution Approach 1:
The patent modifies the chemical structure parameters of the emission layer material by introducing specific polycyclic compound structures with defined molecular weights and functional groups, which changes the electrical and optical properties to achieve lower driving voltage and higher luminous efficiency
Solution Approach 2:
The patent employs composite material design by combining the polycyclic compound with specific host materials and dopants in the emission layer, creating a multi-component system that synergistically improves device performance while maintaining structural simplicity
2Productivity
If conventional materials are used in the emission layer, then the material selection is easy, but the luminous efficiency is low
Solution Approach 1:
The patent optimizes the molecular weight parameter of the polycyclic compound within a specific range (500-2000) and adjusts the proportions of host material and dopant to maximize luminous efficiency while maintaining ease of manufacturing through standard deposition processes
3Duration of action of stationary object
If the emission layer uses standard materials, then the device is easy to manufacture, but the service life is short
Solution Approach 1:
The patent selects specific molecular weight ranges and chemical structures for the polycyclic compound that enhance material stability and device longevity, while maintaining compatibility with existing manufacturing processes to avoid increased complexity
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 polycyclic compound enhances the driving voltage characteristic and luminous efficiency of the light emitting element, leading to improved performance and longer service life, specifically in the blue light emission range.
Implementation Method 1
a so-called self-luminescent light emitting element in which holes and electrons injected from a first electrode and a second electrode recombine in an emission layer, and thus a luminescent material in the emission layer emits light
Data Source
AI summary
A light emitting element includes a first electrode, a second electrode disposed on the first electrode, and at least one functional layer which is disposed between the first electrode and the second electrode, and includes a polycyclic compound represented by Formula 1 below, thereby exhibiting high efficiency and low driving voltage characteristics.