Phenanthrene-Fluoranthene Nitrogen Compound for OLED Stability
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Solution Overview
Problem
Current organic electroluminescent devices face challenges in luminescence efficiency, driving voltage, and service life due to limitations in thermal, photochemical, and electrochemical stability of organic functional materials.
Innovation Solution
A compound connecting phenanthrene and fluoranthene via nitrogen is developed, offering improved film forming properties, optical, electrical, and thermal stability, and high luminescence efficiency, suitable for use as a hole transport or electron blocking layer material in OLED devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic functional materials are used in OLED devices, then the device structure can be maintained, but the luminescence efficiency, driving voltage, and service life are insufficient
Solution Approach 1:
The patent changes the chemical structure parameters of organic functional materials by introducing specific molecular structures (compounds of formula 1) with particular arrangements of phenanthrene and fluoranthene groups connected via nitrogen atoms. This structural parameter change simultaneously improves luminescence efficiency and service life while maintaining device functionality
Solution Approach 2:
The patent employs composite molecular structures combining phenanthrene and fluoranthene groups linked through nitrogen atoms. This composite approach creates materials with synergistic properties that achieve both high luminescence efficiency and extended service life, resolving the contradiction between these two performance parameters
2Stability of the object's composition
If organic functional materials with improved stability are used, then thermal and photochemical stability are enhanced, but film forming stability and crystallinity may be compromised
Solution Approach 1:
The patent applies local quality by designing specific regions within the molecular structure (formula 1) with different functional characteristics. The phenanthrene and fluoranthene groups and nitrogen connections create localized structural features that provide thermal stability while maintaining overall film forming stability and controlling crystallinity at appropriate levels
3Ease of operation
If phenanthrene groups are bonded to nitrogen atoms as described in prior art, then hole transport function is achieved, but luminescence efficiency and stability need further improvement
Solution Approach 1:
The patent merges phenanthrene groups with fluoranthene groups through nitrogen atom connections in a specific molecular arrangement (formula 1). This merging creates a unified structure that simultaneously provides hole transport functionality and enhanced optical stability, eliminating the need for separate functional components
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 compound achieves low electric voltage, long service life, and enhanced luminescence efficiency, making it suitable for applications in the AMOLED industry, outperforming reference compounds in driving voltage, luminescence efficiency, and device service life.
Implementation Method 1
Under the driving of a current, holes and electrons are injected from a cathode and an anode, respectively. After moving a certain distance, the holes and the electrons are compounded in a light-emitting layer, and then released in the form of light or heat to achieve luminescence of the OLED.
Data Source
AI summary
Provided in the present invention are a compound and application thereof. The compound of the present invention has a structure as shown in the formula (1). The compound obtained in the present invention by connecting phenanthrene and fluoranthene groups via nitrogen has the advantages of great optical, electrical, and thermal stability, high luminescence efficiency, low electric voltage, and long service life, and can be used in organic electroluminescent devices. In particular, the compound has the potential for application in the AMOLED industry as an electron blocking layer material or a hole transport layer material.