Organic Electroluminescence Device Using Condensed Nitrogen Heterocyclic Compound
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Solution Overview
Problem
Current organic electroluminescence devices face challenges in achieving high luminous efficiency while being driven at low voltage, with existing phosphorescent materials not adequately balancing high efficiency and durability.
Innovation Solution
Incorporating a highly condensed nitrogen-containing heterocyclic compound in the organic electroluminescence device's light emitting layer, which enhances electron injection and maintains hole injection properties, thereby improving charge balance and efficiency at lower voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If phosphorescent materials (iridium complexes, platinum complexes) are used to improve luminous efficiency, then device efficiency increases, but device durability remains insufficient
Solution Approach 1:
The patent changes the chemical structure parameters of the organic compound by introducing a highly condensed nitrogen-containing heterocyclic ring system. This structural modification alters the electronic properties and charge transport characteristics, enabling the device to achieve high luminous efficiency through improved charge balance without relying solely on phosphorescent materials, thereby addressing the durability issue
Solution Approach 2:
The patent employs a composite approach by combining the highly condensed nitrogen-containing heterocyclic compound with other organic materials in the light-emitting layer. This composite material strategy allows optimization of both efficiency and durability through synergistic effects of different materials with complementary properties
2Productivity
If conventional nitrogen-containing heterocyclic compounds are used to achieve high efficiency, then luminous efficiency improves, but operating voltage remains too high
Solution Approach 1:
The patent modifies the molecular parameters of nitrogen-containing heterocyclic compounds by creating a highly condensed ring structure. This structural change optimizes the HOMO-LUMO energy levels and electron affinity, facilitating easier electron injection and reducing the operating voltage while maintaining high luminous efficiency
Solution Approach 2:
The patent introduces specific functional groups and structural features at localized positions within the heterocyclic compound. The highly condensed nitrogen-containing ring system creates localized regions with enhanced electron-accepting properties, which improve charge balance and reduce voltage requirements without compromising overall device efficiency
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 condensed nitrogen-containing heterocyclic compound in the organic electroluminescence device leads to improved luminous efficiency and low-voltage operation by facilitating easier electron injection into the light emitting layer, resulting in a balanced charge transfer and enhanced device performance.
Implementation Method 1
enhances electron injection and maintains hole injection properties, thereby improving charge balance and efficiency at lower voltages
Implementation Method 2
An organic electroluminescence (EL) device is being watched as a promising display device because light emission with high brightness is obtained at a low voltage
Data Source
AI summary
An organic electroluminescence device includes: a pair of electrodes; and at least one organic layer including a light emitting layer, the light emitting layer being provided between the pair of electrodes, wherein at least one layer of the at least one organic layer contains a compound represented by formula (1):wherein each of Z11 and Z12 independently represents an aromatic heterocyclic ring or an aromatic hydrocarbon ring; R11 represents a hydrogen atom or a substituent, provided that a plurality of R11s are the same or different; m represents an integer of 1 or more; and L1 represents a single bond or an m-valent linking group and is linked to any one of C atoms in R11, Z11 and Z12, provided that when m is 1, L1 does not exist.