Organic Light Emitting Device Using Heteroaryl Compounds
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Solution Overview
Problem
There is a need for an organic light emitting device with improved driving voltage, efficiency, and lifetime, as existing devices face limitations in these areas.
Innovation Solution
The organic light emitting device incorporates a light emitting layer comprising specific compounds represented by Chemical Formulas 1 and 2, which enhance the device's performance by optimizing the injection and recombination of holes and electrons, leading to improved efficiency and extended lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional organic materials are used in the light emitting layer, then the device structure can be kept simple, but the driving voltage remains high and efficiency and lifetime are limited
Solution Approach 1:
The patent changes the chemical parameters of the organic materials by introducing specific heteroatoms (N, O, S) in defined positions within the molecular structure. This parameter change in material composition enables improved charge transport properties, leading to reduced driving voltage and enhanced device efficiency and lifetime without complicating the overall device structure
Solution Approach 2:
The patent employs composite organic materials combining multiple functional groups and heteroatoms within the light emitting layer compounds. This composite approach creates materials with optimized electronic properties that simultaneously achieve low driving voltage and high efficiency/lifetime performance
2Ease of manufacture
If conventional organic materials are used in the light emitting layer, then the material selection is straightforward, but the driving voltage is high and efficiency is limited
Solution Approach 1:
The patent systematically varies molecular parameters such as heteroatom type and position, aromatic ring structures, and substituent groups to optimize material performance. This structured parameter exploration identifies compounds with optimal HOMO/LUMO levels and charge mobility, achieving low driving voltage while maintaining clear material selection criteria
Solution Approach 2:
The patent introduces specific functional groups and heteroatoms at particular positions within the molecular structure to create local regions with optimized electronic properties. This local modification approach enables precise control over charge injection and transport, reducing driving voltage without requiring complete material replacement
3Reliability
If conventional organic materials are used in the light emitting layer, then the device can operate with standard materials, but the efficiency and lifetime are improved only with new compound structures
Solution Approach 1:
The patent modifies molecular parameters including heteroatom composition, aromatic ring systems, and substituent patterns to enhance material performance. These targeted parameter changes improve charge transport and recombination efficiency, achieving high efficiency and lifetime while maintaining relatively simple molecular architectures based on common organic building blocks
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 these compounds in the light emitting layer results in reduced driving voltage and improved efficiency, along with extended lifetime characteristics for the organic light emitting device.
Implementation Method 1
an organic light emitting phenomenon refers to a phenomenon where electric energy is converted into light energy by using an organic material
Data Source
AI summary
An organic light emitting device having improved driving voltage, efficiency and lifetime. The device includes a light emitting layer containing a compound of Chemical Formulae 1 and 2:wherein: X1-X7 are each independently CR1 or N, at least one of X1-X7 is N, and each R1 is independently hydrogen, deuterium, or a substituted or unsubstituted C6-60 aryl or C2-60 heteroaryl containing any one or more of N, O and S; Ar1 and Ar2 are each independently a substituted or unsubstituted C6-60 aryl or C2-60 heteroaryl containing at least one of N, O and S; A and B are each independently hydrogen, deuterium, or a substituted or unsubstituted C6-60 aryl or C2-60 heteroaryl containing at least one of N, O and S, provided that at least one of A and B is and the other substituents are described in the specification.