Platinum NNCN Complex for Deep Red OLED Efficiency
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Solution Overview
Problem
The development of high-quality red phosphorescent materials for OLEDs is hindered by small energy gaps, stability issues, and quenching phenomena, leading to low luminescence efficiency and short service life.
Innovation Solution
A platinum complex with an NNCN tetradentate ligand is used in organic light emitting diodes, enhancing luminescence efficiency and stability, and allowing for the creation of deep red phosphorescent materials with improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If red phosphorescent materials are used in OLEDs, then deep red light emission is achieved, but luminescence efficiency is reduced due to small energy gaps and quenching phenomena
Solution Approach 1:
The patent changes the chemical composition parameters of the phosphorescent material by incorporating platinum complex with NNCN tetradentate ligand, which has specific electronic structure characteristics. This parameter change in material composition resolves the contradiction by enabling deep red emission while maintaining high luminescence efficiency through the unique properties of the Pt-NNCN complex structure.
Solution Approach 2:
The patent uses a composite material system consisting of platinum complex coordinated with NNCN tetradentate ligand. This composite structure combines the advantages of heavy metal platinum for high phosphorescence efficiency with the specific electronic properties of the NNCN ligand system, achieving both deep red emission and high luminescence efficiency simultaneously.
2Illumination intensity
If red phosphorescent materials are used to achieve deep red light emission, then the energy gap is reduced, but stability is worsened due to increased susceptibility to quenching
Solution Approach 1:
The patent modifies the molecular structure parameters of the phosphorescent material by designing specific NNCN tetradentate ligand structures coordinated with platinum. This structural parameter change creates a more stable electronic configuration that reduces quenching susceptibility while maintaining the small energy gap needed for deep red emission, thus resolving the stability contradiction.
Solution Approach 2:
The NNCN tetradentate ligand acts as an intermediary between the platinum center and the external environment, providing steric protection and electronic stabilization. This intermediary structure shields the excited state from quenching interactions while allowing the necessary optical transitions for deep red emission, resolving the stability issue.
3Adaptability or versatility
If conventional phosphorescent materials are used, then green emission is well-developed, but red and blue phosphorescent materials lag behind due to material limitations
Solution Approach 1:
The patent systematically changes the ligand structure parameters of the phosphorescent complex to tune the emission wavelength. By modifying the NNCN tetradentate ligand structure, the patent achieves deep red emission while maintaining high performance, thereby expanding the versatility of phosphorescent materials across the visible spectrum while ensuring reliability.
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 platinum complex-based luminescent materials exhibit improved luminescence efficiency and extended service life, meeting industrial requirements for OLEDs, particularly in achieving dark red light emission with lower driving voltage and higher efficiency.
Implementation Method 1
Due to the strong spin-orbit coupling of the electronic structure of d6 and d8, the probability of intersystem cross from the singlet state to triplet state is increased, the phosphorescence efficiency is greatly improved
Implementation Method 2
the phosphorescence efficiency is greatly improved, the phosphorescence lifetime is shortened, the phosphorescence quenching is reduced, and the phosphorescence phenomenon at room temperature is realized
Implementation Method 3
The organometallic complex luminescent materials have heavy metal complexes, such as iridium (Ir) complex and platinum (Pt) complex
Data Source
AI summary
A luminescent material made of platinum complex having NNCN tetradentate ligand, and applications thereof in light emitting diode are provided. The platinum complex is a compound has a structure as shown in Formula (I). When applied to an organic light emitting diode, and has the potential to be applied to the field of organic electroluminescent devices. An organic electroluminescent device is further provided, which includes a cathode, an anode and an organic layer. The organic layer is selected from the group consisting of an electron hole injection layer, an electron hole transport layer, a luminescent layer, an electron hole blocking layer, an electron transport layer, an electron injection layer, and any combination thereof. At least one of the organic layers contains a compound represented by structural formula (I).