Fused Polycyclic Compound for OLED Emission Layer Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current organic electroluminescence (OEL) elements face challenges in achieving low driving voltage, high luminous efficiency, and long service life, which are essential for efficient display devices.
Innovation Solution
A light emitting element is developed, incorporating a fused polycyclic compound represented by specific formulas, which is used in the emission layer between the electrodes. This compound improves luminous efficiency and service life by optimizing the structure and properties of the light emitting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic electroluminescence materials are used, then the device can operate, but luminous efficiency and service life are insufficient
Solution Approach 1:
The patent modifies molecular parameters of the organic compound by introducing specific substituents (electron-donating or electron-withdrawing groups) at defined positions on the aromatic ring. This changes the HOMO-LUMO energy levels, electron mobility, and triplet energy of the material, thereby simultaneously improving luminous efficiency and device service life through optimized electronic properties
Solution Approach 2:
The invention creates a composite emission layer by combining the novel organic electroluminescence compound with host materials, dopants, and functional additives. This composite approach allows synergistic effects where the core compound provides high efficiency and long lifetime characteristics while supporting materials enhance stability, charge transport, and overall device performance
2Use of energy by moving object
If driving voltage is reduced, then energy consumption decreases, but maintaining high luminous efficiency becomes difficult
Solution Approach 1:
The patent adjusts the molecular structure parameters to achieve lower ionization potential and electron affinity values, which reduce the energy barrier for charge injection and transport. This enables low driving voltage operation while the optimized triplet energy and radiative decay properties maintain high luminous efficiency in the emission layer
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 element significantly enhances luminous efficiency and extends the service life, leading to improved display quality and performance.
Implementation Method 1
An organic electroluminescence display device is different from a liquid crystal display in that it is a so-called self-luminescent display device in which holes and electrons respectively injected from a first electrode and a second electrode recombine in an emission layer, so that a luminescent material including an organic compound in the emission layer emits light
Implementation Method 2
technologies pertaining to phosphorescence emission, which uses triplet state energy
Implementation Method 3
fluorescence, which uses triplet-triplet annihilation (TTA) where singlet excitons are generated by collision of triplet excitons
Implementation Method 4
Development is currently directed to thermally activated delayed fluorescence (TADF) materials which use delayed fluorescence phenomenon
Data Source
AI summary
Embodiments provide a fused polycyclic compound, a light emitting element that includes the fused polycyclic compound, and a display device that includes the light emitting element. The light emitting element includes a first electrode, a second electrode disposed on the first electrode, and an emission layer disposed between the first electrode and the second electrode and including a first compound represented by Formula 1, which is explained in the specification: