PtM3 Heterotetranuclear Complex for OLED Phosphorescence
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Solution Overview
Problem
Current phosphorescent materials for organic light-emitting diodes, particularly cyclometallic iridium(III) complexes, face challenges such as high cost, incomplete chromaticity, and resource scarcity, while ionic phosphorescent metal complexes offer better stability and cost-effectiveness but lack efficient phosphorescent emission.
Innovation Solution
A phosphorescent PtM3 heterotetranuclear metal alkynyl complex is developed, with the formula [PtM3{(PR″2CH2)3P}(C≡CR)(C≡CR′)(μ—Cl)]2+An−2/n, where M is Au(I) or Ag(I), and R, R′, and R″ are various alkyl, aryl, and heteroaryl groups, providing strong phosphorescent emission and high quantum yield in both solid and thin film forms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cyclometallic iridium(III) complexes are used as phosphorescent materials, then the light-emitting layer can be conveniently prepared by vacuum thermal evaporation, but the materials are expensive and iridium resources are scarce
Solution Approach 1:
The patent changes the chemical composition parameters by replacing iridium with platinum and adopting a heterotetranuclear structure with gold or silver atoms, while maintaining the phosphorescent properties and vacuum thermal evaporation compatibility. This substitution reduces material cost and resource scarcity issues while preserving the manufacturing convenience.
Solution Approach 2:
The invention creates a composite heterotetranuclear complex containing platinum, gold/silver, and organic ligands in a specific structural arrangement. This composite structure combines the advantages of different metals and organic components to achieve both cost-effectiveness and manufacturing feasibility through vacuum thermal evaporation.
2Quantity of substance
If ionic phosphorescent metal complexes are used, then the preparation cost is reduced and stability is improved, but phosphorescent emission efficiency is insufficient
Solution Approach 1:
The patent modifies the structural parameters by designing a heterotetranuclear complex with specific metal combinations (Pt-Au-Au-Au or Pt-Ag-Ag-Ag) and organic ligand arrangements. This structural optimization enhances phosphorescent emission efficiency while maintaining the cost-effectiveness and stability of ionic complexes, resolving the contradiction between efficiency and cost.
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 PtM3 heterotetranuclear metal alkynyl complex achieves high phosphorescence quantum efficiency (>60%) and wide color distribution, making it suitable as a dopant for light-emitting layers in organic light-emitting diodes with improved electro-optical conversion efficiency and reduced production costs.
Implementation Method 1
The PtM3 heterotetranuclear metal alkynyl complex produces strong phosphorescent emission in both solid powder and thin film, and the phosphorescence quantum yield is higher than 60% in the thin film
Data Source
AI summary
An ionic phosphorescent metal complex complex has a formula of [PtM3{(PR″2CH2)3P}(C≡CR)(C≡CR′)(μ—Cl)]2+ An−2/n. M is selected from Au(I) and Ag(I). R, R′ and R″ are identical or different, and are independently selected from alkyl, alkenyl, alkynyl, aryl, and heteroaryl. Each of the alkyl, alkenyl, alkynyl, aryl, and heteroaryl may be substituted with one or more substituents selected from alkyl, alkenyl, alkynyl, alkoxy, amino, halogen, halogenated alkyl, aryl, and heteroaryl. The substituent is optionally further substituted with one or more of the following groups: alkyl, alkenyl, alkynyl, alkoxy, amino, halogen, halogenated alkyl, aryl, and heteroaryl. An− is a monovalent or divalent anion, n is 1 or 2, μ—represents bridging linkage. The organic light-emitting diode prepared by using the complex as the light-emitting layer dopant has an external quantum efficiency of 10% or more, and can be applied to the fields of flat panel display and daily lighting.