Polycyclic Compound Emission Layer for OLED Efficiency and Lifespan
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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 stabilizing these characteristics for effective light emission.
Innovation Solution
Incorporating a polycyclic compound represented by specific formulas in the emission layer of a light emitting device, which includes a first electrode, a second electrode, and functional layers such as a hole transport region and an electron transport region, to enhance luminous efficiency and service life through delayed fluorescence mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic electroluminescence materials are used, then the device can emit light, but the luminous efficiency and service life are insufficient
Solution Approach 1:
The patent modifies molecular parameters of the organic compound by introducing specific heteroatoms (nitrogen, oxygen) and functional groups (carboxylic acid, amide) to optimize the HOMO-LUMO energy gap and improve delayed fluorescence characteristics, thereby simultaneously enhancing luminous efficiency and service life
Solution Approach 2:
The invention creates a composite emission layer by combining the novel polycyclic compound with host materials and dopants, forming a multi-component system that leverages synergistic effects to achieve both high luminous efficiency and extended service life
2Productivity
If phosphorescence emission using triplet state energy is used, then luminous efficiency can be improved, but device complexity and material stability become issues
Solution Approach 1:
The patent extracts and utilizes the delayed fluorescence mechanism from the polycyclic compound structure, separating this beneficial property from the complexity of phosphorescent systems. By focusing on singlet exciton generation through TTA rather than triplet state phosphorescence, the invention simplifies the material system while maintaining high efficiency
Solution Approach 2:
The novel compound structure inherently possesses the ability to generate singlet excitons through triplet-triplet annihilation, making the system self-sufficient for delayed fluorescence emission without requiring additional phosphorescent dopants or complex multi-layer structures
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 improves the luminous efficiency and extends the service life of the light emitting device by optimizing the emission layer's performance, specifically through enhanced delayed fluorescence characteristics and photoluminescence quantum yield.
Implementation Method 1
technologies pertaining to phosphorescence emission using triplet state energy or to delayed fluorescence emission which uses the generating phenomenon of singlet excitons by the collision of triplet excitons (triplet-triplet annihilation, TTA) are being developed
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
a so-called self-luminescent light emitting 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 of the emission layer emits light
Data Source
AI summary
Embodiments provide a light emitting device that includes a first electrode, a second electrode facing the first electrode, and at least one functional layer disposed between the first electrode and the second electrode. The at least one functional layer includes: a first compound represented by Formula 1; and at least one of a second compound represented by Formula HT or a third compound represented by Formula ET, wherein Formula 1, Formula HT, and Formula ET are each explained in the specification. The light emitting device exhibits low voltage, high efficiency, and long service life characteristics.