Polycyclic Compound Dopant for OLED Luminous Efficiency
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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, with existing technologies not effectively addressing these requirements.
Innovation Solution
A light emitting element incorporating a novel polycyclic compound in the emission layer, specifically designed to enhance luminous efficiency, where the polycyclic compound is used as a dopant in the emission layer, facilitating delayed fluorescence and optimized for a center wavelength of 460 nm to 650 nm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional light emitting materials are used, then the device structure is simple, but the luminous efficiency is insufficient
Solution Approach 1:
The patent employs composite materials by combining the novel polycyclic compound (Formula 1) with host materials (Formula E-2a or E-2b) to create an emission layer with enhanced luminous efficiency. The composite system leverages the unique properties of both materials: the polycyclic compound provides superior luminescence characteristics while the host material facilitates charge transport and exciton management, thereby resolving the contradiction between structural simplicity and high luminous efficiency.
2Productivity
If phosphorescence emission or TADF materials are used to improve luminous efficiency, then the luminous efficiency increases, but the device complexity increases
Solution Approach 1:
The patent utilizes parameter changes by optimizing the molecular structure of the polycyclic compound (Formula 1) with specific substituents (R1-R14) to achieve desired photophysical properties. By adjusting structural parameters such as substituent types and positions, the compound exhibits enhanced delayed fluorescence characteristics and appropriate energy levels, enabling high luminous efficiency without requiring complex multi-layer device structures or additional auxiliary materials.
3Power
If existing emission layer materials are used, then the driving voltage is maintained at acceptable levels, but the service life is insufficient
Solution Approach 1:
The patent employs the novel polycyclic compound as a dopant in the emission layer that enables efficient exciton utilization through delayed fluorescence mechanisms. This approach allows for complete utilization of both singlet and triplet excitons, significantly reducing energy waste and heat generation, thereby extending the operational lifetime of the device while maintaining acceptable driving voltage levels. The compound acts as a replaceable active material that can be optimized independently of the overall device structure.
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 novel light emitting element exhibits improved luminous efficiency and delayed fluorescence characteristics, achieving high luminous performance while maintaining low driving voltage and extended service life.
Implementation Method 1
thermally activated delayed fluorescence (TADF) materials using delayed fluorescence phenomenon are being developed
Implementation Method 2
delayed fluorescence using triplet-triplet annihilation (TTA) in which singlet excitons are generated by collision of triplet excitons
Implementation Method 3
holes and electrons injected from a first electrode and a second electrode recombine in an emission layer, and thus a luminescent material of the emission layer emits light
Data Source
AI summary
A light emitting element includes a first electrode, a second electrode, and at least one functional layer which is disposed between the first electrode and the second electrode and includes a compound represented by Formula 1 below, thereby exhibiting high efficiency characteristics. The compound of Formula 1 may be included in the emission layer of the light emitting element as a dopant.