OLED Emissive Compound Structure for Saturated Color Without Filters
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Solution Overview
Problem
Existing organic light emitting diodes (OLEDs) face challenges in achieving saturated red, green, and blue pixel emissions required by industry standards, and conventional methods for white OLEDs often require complex stack structures or absorption filters, which can be inefficient.
Innovation Solution
The development of a compound with a specific structure (Formula I) that can be used in OLEDs to enhance emission capabilities, allowing for direct production of saturated colors or white light without the need for complex stack structures or filters, by incorporating metals like Pt, Pd, or Au, and various ring systems with specific substitutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional white OLEDs use absorption filters to produce saturated colors, then color purity can be achieved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts and eliminates the absorption filter layer from the conventional white OLED stack structure. By using a single-emissive-layer design with thermally activated delayed fluorescence (TADF) materials, the invention removes the need for separate color filtering components, thereby reducing device complexity while maintaining color purity through the inherent emission properties of the TADF compound.
Solution Approach 2:
The TADF compound serves multiple functions simultaneously: it acts as the emissive material, the color-determining element, and eliminates the need for separate filter layers. This multi-functional approach allows a single material system to achieve what previously required multiple specialized layers (white emission layer + red/green/blue filters), thereby simplifying the overall device structure.
2Manufacturing precision
If conventional white OLEDs use absorption filters, then saturated colors can be produced, but manufacturing cost and process difficulty increase
Solution Approach 1:
The invention extracts and removes the absorption filter layer from the manufacturing process. By using TADF materials that inherently emit saturated colors through thermal activation, the patent eliminates the need for separate filter fabrication steps, thereby simplifying the manufacturing process while maintaining color saturation through the compound's intrinsic emission characteristics.
Solution Approach 2:
The patent changes the emission mechanism from conventional electroluminescence to thermally activated delayed fluorescence. This parameter change in the emission physics allows the material to produce saturated colors through thermal energy conversion rather than requiring optical filtering, thereby simplifying manufacturing while achieving the desired color saturation.
3Manufacturing precision
If conventional OLEDs use multiple emissive layers and filters, then saturated colors are achieved, but device structure becomes complex
Solution Approach 1:
The patent merges the functions of multiple separate layers (white emissive layer, red filter, green filter, blue filter) into a single TADF emissive layer. This consolidation achieves color accuracy through the inherent emission spectrum of the TADF compound, eliminating the need for multiple separate functional layers and thereby reducing overall device structural complexity.
Solution Approach 2:
The TADF compound performs the function of all color-specific emissive layers and filter layers simultaneously. This universal material approach allows a single compound system to replace what would traditionally require multiple specialized layers, achieving color accuracy while simplifying the overall device architecture.
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 enables efficient production of saturated red, green, and blue pixels, or white light in OLEDs, simplifying the manufacturing process and improving color accuracy without the need for additional filters or complex layering.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
A compound including a structure of Formula I,is provided. In Formula I, M is Pt, Pd, or Au; moiety A is a 5-membered or 6-membered ring; each of moiety B, C, and D is a monocyclic ring or a polycyclic fused ring system; each of X1 to X6 and Z1 to Z3 is C or N; X9 is CRE or N; each of K1 and K2 is independently a direct bond or a linking group; each of L1 to L3 is a direct bond or a linking group; each R substituent is hydrogen or a General Substituent defined herein; and at least one of RF and RF′ is not hydrogen, and at least one of RG and RG′ is not hydrogen. Formulations, OLEDs, and consumer products containing the compound are also provided.