Polycyclic OLED Compounds for High Efficiency at Low Driving Voltage
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Solution Overview
Problem
Current organic electronic elements face challenges in achieving high luminous efficiency, long life, and low driving voltage due to limitations in the development of stable and efficient organic material layers, particularly for OLEDs, where the optimal combination of energy levels and intrinsic properties is difficult to achieve.
Innovation Solution
The development of specific polycyclic compounds represented by Formulas (1) and (18) for use in organic electronic elements, which improve luminous efficiency, driving voltage, and heat resistance, and are incorporated into various layers such as the emitting layer, hole transport layer, and electron transport layer to enhance the performance of OLEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a light emitting material is used in an organic electric element, then luminous efficiency is improved, but driving voltage increases
Solution Approach 1:
The patent modifies the molecular structure of polycyclic compounds by changing parameters such as ring fusion positions, heteroatom types and arrangements, and substituent groups. These parameter changes optimize the energy levels (HOMO, LUMO) and electrical characteristics of the materials, enabling high luminous efficiency while maintaining low driving voltage through improved charge transport and balanced electron-hole injection.
Solution Approach 2:
The patent develops composite organic material systems comprising multiple functional layers with different polycyclic compounds. Each layer is composed of materials with optimized energy level alignment, creating a composite structure that achieves both high luminous efficiency and low driving voltage through synergistic effects of charge generation, transport, and recombination across interfaces.
2Power
If the efficiency is increased, then the driving voltage is decreased, but the crystallization of organic material due to joule heating increases
Solution Approach 1:
The patent modifies molecular parameters including increasing molecular weight, adding bulky substituents, and designing rigid polycyclic structures with high glass transition temperatures. These parameter changes increase thermal stability and reduce crystallization tendency, allowing the material to withstand joule heating effects even at low driving voltages where high efficiency operation generates heat.
Solution Approach 2:
The patent develops organic materials with inherent thermal stability that prevent crystallization during operation. By designing materials that resist phase transitions under operating conditions, the invention ensures long-term device stability without requiring additional protective structures or cooling mechanisms.
3Productivity
If a host/dopant system is used to increase luminous efficiency, then color purity is improved, but the maximum light emission wavelength shifts to long wavelength
Solution Approach 1:
The patent designs polycyclic compounds with specific molecular parameters including conjugation length, ring fusion patterns, and heteroatom composition that directly control the energy band gap. By optimizing these parameters, the invention achieves high luminous efficiency through effective charge transport while maintaining short emission wavelengths in the blue to green region, preventing unwanted spectral shifts.
Solution Approach 2:
The patent introduces specific functional groups and heteroatoms at localized positions within the polycyclic molecular structure to tune the energy levels and emission characteristics. This local modification approach allows precise control over emission wavelength while maintaining the overall high efficiency characteristics of the polycyclic core 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
These compounds significantly improve the color purity, lifetime, and efficiency of organic electronic elements by maintaining or reducing driving voltage, while providing high thermal stability and charge balance, outperforming comparative compounds in electroluminescent properties and device longevity.
Implementation Method 1
organic light emitting phenomenon refers to a phenomenon that converts electric energy into light energy by using an organic material
Implementation Method 2
the excitons generated in the emitting layer are transported to the dopant to emit light with high efficiency
Data Source
AI summary
Provided is a compound capable of improving luminous efficiency, stability and lifetime of an organic electronic device, an organic electric element using the same, and an electronic device comprising the element.