Polycyclic Compound Emission Layer for OLED Service Life
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Solution Overview
Problem
Current organic electroluminescence display devices face challenges in achieving low driving voltage, high luminous efficiency, and long service life, particularly in developing materials that stabilize these characteristics.
Innovation Solution
A light emitting element is designed with an emission layer containing specific polycyclic compounds, such as those represented by Formulas 1 to 5, which improve the service life by enhancing the stability and efficiency of the luminescent material, potentially using a combination of compounds like those in Formula 1, Formula HT-1, Formula ET-1, and Formula D-1 to facilitate thermally activated delayed fluorescence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic electroluminescence materials are used, then the device can achieve basic light emission, but the service life is limited and stability is insufficient
Solution Approach 1:
The patent employs composite materials by combining a first compound (Formula 1) with at least one of a second compound (Formula HT-1) or third compound (Formula ET-1) in the emission layer. This composite approach leverages the complementary properties of different compounds to achieve both improved service life and enhanced material stability, resolving the contradiction between reliability and compositional stability.
Solution Approach 2:
The patent utilizes thermally activated delayed fluorescence (TADF) mechanisms that involve changing the energy state parameters of the material through thermal activation. By controlling the triplet-triplet annihilation process and managing the thermal energy distribution, the material achieves stable operation and extended service life while maintaining compositional integrity.
2Productivity
If phosphorescence emission materials are used to achieve high efficiency, then luminous efficiency improves, but service life and stability become more difficult to maintain
Solution Approach 1:
The patent introduces an intermediary mechanism through the use of a first compound that facilitates thermally activated delayed fluorescence. This intermediary approach allows the system to capture triplet excitons and convert them to singlet excitons through thermal activation, thereby maintaining high luminous efficiency while improving service life through the controlled energy transformation process.
Solution Approach 2:
The patent ensures continuous useful action by utilizing the delayed fluorescence mechanism that continuously converts triplet excitons to singlet excitons over an extended period. This continuous energy transformation process maintains high luminous efficiency throughout the operational life of the device, simultaneously improving both productivity and reliability.
3Productivity
If thermally activated delayed fluorescence materials are developed to improve efficiency, then luminous efficiency increases, but material stability and service life remain challenging to achieve
Solution Approach 1:
The patent employs composite materials by combining a first compound (Formula 1) with at least one of a second compound (Formula HT-1) or third compound (Formula ET-1) in the emission layer. This composite approach leverages the complementary properties of different compounds to achieve both improved service life and enhanced material stability, resolving the contradiction between reliability and compositional stability.
Solution Approach 2:
The patent applies local quality by designing the emission layer with specific spatial distribution of different compounds. The first compound is positioned to facilitate TADF, while the second or third compound is strategically placed to enhance stability and extend service life in specific regions, optimizing both luminous efficiency and material stability through localized functional assignment.
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 solution extends the service life of the light emitting element while maintaining high luminous efficiency and low driving voltage, addressing the material stability and efficiency challenges in organic electroluminescence display devices.
Implementation Method 1
Development is currently directed to a material for thermally activated delayed fluorescence (TADF) using delayed fluorescence phenomenon
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
technologies on phosphorescence emission which uses energy in a triplet state
Implementation Method 4
the organic electroluminescence display device is a so-called self-luminescent display device in which holes and electrons 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
Data Source
AI summary
Embodiments provide a light emitting element that 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, wherein the emission layer includes a compound represented by Formula 1, thereby exhibiting long service life characteristics. Formula 1 is explained in the specification.