Fused Polycyclic Emission Layer for Low-Voltage OLED Lifetime
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Solution Overview
Problem
Existing organic electroluminescence devices face challenges in reducing driving voltage and improving emission efficiency and lifetime, necessitating the development of advanced materials for enhanced performance.
Innovation Solution
Incorporation of a fused polycyclic compound represented by specific chemical formulas in the emission layer of a light emitting element, which includes a first electrode and a second electrode, to enhance emission efficiency and element lifetime.
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 and lifetime are insufficient
Solution Approach 1:
The patent modifies the molecular structure parameters of organic electroluminescence materials by introducing specific fused polycyclic compound structures with defined chemical formulas and substituent groups, thereby changing the electronic and optical properties to achieve improved emission efficiency and extended element lifetime
Solution Approach 2:
The patent employs composite material design by combining the fused polycyclic compound (Formula 1) with various substituent groups (Ar1, Ar2, R1-Rk) and integrating it into the emission layer with other functional materials to create a composite system that simultaneously achieves high emission efficiency and long lifetime
2Power
If conventional organic electroluminescence materials are used, then the device complexity is low, but the driving voltage cannot be reduced sufficiently
Solution Approach 1:
The patent changes the electronic parameters of the emission layer materials by designing fused polycyclic compounds with specific HOMO-LUMO energy levels and charge transport properties, enabling reduced driving voltage while maintaining device functionality
Solution Approach 2:
The fused polycyclic compound acts as an intermediary material in the emission layer that facilitates efficient charge injection and transport between electrodes, thereby reducing the 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 fused polycyclic compound improves the emission efficiency and extends the lifetime of the light emitting element, leading to improved display quality in organic electroluminescence devices.
Implementation Method 1
fluorescence emission which utilizes the generating phenomenon of singlet excitons by the collision of triplet excitons (triplet-triplet annihilation, TTA)
Implementation Method 2
techniques on phosphorescence emission which utilizes energy in a triplet state
Implementation Method 3
development on a thermally activated delayed fluorescence (TADF) material utilizing the delayed fluorescence phenomenon
Data Source
Figure 1
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Figure 3~4
AI summary
A display apparatus comprises a display panel comprising a base layer, a circuit layer (DP-CL) on the base layer (BS), and a display device layer on the circuit layer and comprising a light emitting element. The light emitting element comprises a first electrode, a second electrode facing the first electrode, and an emission layer between the first electrode and the second electrode. The emission layer comprises a first compound represented by Formula 1.