Platinum Complex Near-Infrared Emission via Trigonal Bipyramidal Geometry
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Solution Overview
Problem
Current OLED technologies face challenges in synthesizing platinum complexes with efficient luminescence in the near-infrared region beyond 700 nm and require time-consuming purification processes, hindering mass production and effective emission in this range.
Innovation Solution
A platinum complex with a nitrogen-containing bidentate chelate and a 6-membered ring structure is developed, enhancing rigidity and planarity, leading to improved photophysical properties such as red-shifted emission wavelengths and increased photoluminescence quantum efficiency, allowing for efficient near-infrared emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional tetra-coordinated platinum complexes are synthesized, then emission properties in visible region are achieved, but purification steps become time-consuming and near-infrared emission beyond 700 nm cannot be obtained
Solution Approach 1:
The patent changes the coordination geometry parameter from conventional tetra-coordinated square-planar to five-coordinated trigonal bipyramidal geometry. This structural parameter change fundamentally alters the electronic structure and emission properties, enabling near-infrared emission beyond 700 nm while simplifying the synthesis process and eliminating time-consuming purification steps
Solution Approach 2:
The patent employs a composite molecular structure combining platinum center with specific organic ligands (containing nitrogen-containing bidentate chelates and 6-membered ring structures). This composite design achieves both the desired near-infrared emission properties and simplified synthesis, resolving the contradiction between manufacturing ease and productivity
2Ease of manufacture
If conventional molecular designs are used for platinum complexes, then synthesis is straightforward, but efficient luminescence in near-infrared region beyond 700 nm cannot be achieved
Solution Approach 1:
The patent fundamentally changes the coordination number parameter from 4 to 5, creating a trigonal bipyramidal geometry. This parameter change enables access to new electronic states that emit in the near-infrared region beyond 700 nm, while the synthetic route remains straightforward without requiring complex purification steps
3Illumination intensity
If existing platinum complexes are used, then visible region emission is achieved, but emission wavelength cannot be red-shifted into near-infrared region
Solution Approach 1:
The patent changes the coordination geometry parameter to five-coordinated trigonal bipyramidal structure, which fundamentally alters the HOMO-LUMO energy gap. This parameter change enables red-shifting of emission wavelength into the near-infrared region beyond 700 nm, achieving broader illumination range without excessively complicating the molecular 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
The platinum complex achieves stable and efficient near-infrared emission with extended π-conjugation, facilitating easier synthesis and improved luminescence efficiency, overcoming the limitations of existing technologies in the near-infrared region.
Implementation Method 1
The invention provides a platinum complex having a structure represented by general formula (I)... The platinum complex of this invention has two nitrogen-containing aryl chelating chelates, and one 6-membered ring structure is added between the two nitrogen-containing aryl chelates. Therefore, the rigidity and the planarity may be significantly enhanced. The platinum complex of this invention has a better planar molecular structure and more effective and better extended π-conjugation, and the latter is provided by the multiple connected 6-membered ring structure within the chelate. In the invention, these structural characteristics provide the resulting platinum complex with better photophysical properties, such as red shifted emission wavelength into the near-infrared region and increased photoluminescence quantum efficiency.
Data Source
AI summary
Provided is a platinum complex having a structure represented by formula (I):wherein A1 to A3 each independently represent a 5-membered or 6-membered unsaturated ring, A3 is optionally formed between A1 and A2; X1, X2, and X3 each independently represent carbon or nitrogen; R1 represents hydrogen, substituted or unsubstituted C1-C6 alkyl, —CF2H, —CFH2, substituted or unsubstituted C6-C12 aryl or —CmF2m+1, m is an integer of 1 to 5; R2 and R3 each independently represent hydrogen, C1-C12 alkyl, substituted or unsubstituted C1-C6 alkoxyl, substituted or unsubstituted C6-C12 aryl, or —CnF2n+1, n is an integer of 0 to 3; p and q each independently represent an integer of 1 to 2; and when p or q is equal to 2, two R2's or R3's may join to form a C3-C8 aromatic or nitrogen-containing heteroaromatic ring.