Pt/Pd Organic Emissive Compounds for Saturated Color OLEDs
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Solution Overview
Problem
Conventional OLEDs face challenges in achieving saturated color emission, particularly in red, green, and blue pixels, which are essential for full-color displays, and existing technologies struggle to efficiently utilize organic materials for flexible and cost-effective opto-electronic devices.
Innovation Solution
The development of a compound of Formula I, specifically designed for use in OLEDs, which includes platinum (Pt) or palladium (Pd) as the metal center, with specific ring and substituent configurations, enabling enhanced emission properties and flexibility in organic light-emitting diodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional organic materials are used in OLEDs, then cost and flexibility are improved, but color saturation and emission efficiency deteriorate
Solution Approach 1:
The patent modifies the molecular structure parameters of organic compounds by introducing specific heterocyclic rings (triazole, tetrazole, oxadiazole, thiadiazole) and adjusting substituent positions to optimize both color saturation and efficiency while maintaining cost-effectiveness of organic materials
Solution Approach 2:
The patent creates composite emissive compounds combining metal centers (Ir, Pt, Pd) with organic ligand systems containing heterocyclic rings, achieving enhanced color saturation and efficiency properties that neither component alone could provide
2Adaptability or versatility
If conventional organic materials are used in OLEDs, then flexibility is improved, but emission efficiency deteriorates
Solution Approach 1:
The patent optimizes molecular weight, rigidity, and functional group parameters of organic compounds to achieve high emission efficiency while preserving the flexibility inherent in organic materials, enabling fabrication on flexible substrates
Solution Approach 2:
The patent replaces conventional fluorescent emission mechanisms with phosphorescent and TADF mechanisms, utilizing spin-orbit coupling and triplet state management to dramatically improve emission efficiency while maintaining organic material flexibility
3Manufacturing precision
If saturated color emission is achieved using conventional methods, then color saturation is improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the need for complex color filtering layers and multiple emissive layers by achieving saturated color emission directly from single-layer phosphorescent and TADF compounds, simplifying overall device structure
Solution Approach 2:
The patent develops universal heterocyclic ligand frameworks that can be adapted to produce different saturated colors (red, green, blue) by modifying substituents, allowing single-material-platform approach to replace multiple specialized components
4Manufacturing precision
If phosphorescent emissive molecules are used for full color display, then color saturation is improved, but manufacturing cost increases
Solution Approach 1:
The patent modifies ligand structure parameters to use abundant, low-cost organic ligands (triazole, tetrazole, oxadiazole, thiadiazole derivatives) coordinated with metal centers, achieving saturated phosphorescent emission at reduced material cost
Solution Approach 2:
The patent employs organic ligands with shorter lifetimes and lower synthesis costs that can be efficiently processed and deposited, replacing expensive conventional phosphorescent materials while maintaining color saturation performance
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 improves the efficiency and color saturation of OLEDs, leading to higher photoluminescence quantum yield and electroluminescence efficiency, making them suitable for flexible and cost-effective full-color displays.
Implementation Method 1
One application for phosphorescent emissive molecules is a full color display
Implementation Method 2
higher photoluminescence quantum yield
Data Source
AI summary
A compound of Formula I,is provided. In Formula I, M is Pt or Pd; rings B, C, and D are each independently 5-membered or 6-membered rings; X1 to X5 are C or N, with at lest two being C; K1 is O or S; Z3 is C or N; each represents a single bond or a double bond; L1 is a linker, each R, R′, R″, R1, RA, RB, RC, and RD is independently hydrogen or a substituent selected from the group general substituent; and any two substituents may be joined or fused together to form a ring. Formulations, OLEDs, and consumer products including the compound of Formula I are also provided.