OLED Emissive Compounds 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 colors for full color displays, and conventional methods for producing white light often require complex stack structures or absorption filters, which can be inefficient and costly.
Innovation Solution
Development of organometallic compounds with specific structural formulas that can be used as hosts or emitters in OLEDs, including compounds with monocyclic or multicyclic ring systems and specific ligand configurations, enabling efficient emission of saturated colors without the need for complex stack structures or filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional methods use white OLED with absorption filters to produce saturated colors, then color saturation can be achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and eliminates the need for absorption filters and complex stack structures by developing organic compounds that directly emit saturated colors. The compounds in Formula I are designed to emit red, green, and blue colors directly without requiring white light conversion through filters, thereby simplifying the device architecture while maintaining color saturation.
Solution Approach 2:
The patent changes the emission parameters of the organic compounds by designing specific molecular structures with Formula I that enable direct emission of saturated colors. By modifying the chemical structure parameters (ring systems, substituents, and molecular configuration), the compounds achieve tuned emission wavelengths that correspond to saturated red, green, and blue colors, eliminating the need for color conversion filters.
2Illumination intensity
If conventional methods use absorption filters to produce saturated colors from white light, then color purity can be achieved, but manufacturing cost increases
Solution Approach 1:
The patent removes the expensive absorption filter components from the manufacturing process by designing organic compounds that inherently emit saturated colors. The compounds' molecular structures are engineered to produce pure red, green, and blue emission without requiring additional filtering layers, thereby reducing material costs and simplifying manufacturing.
Solution Approach 2:
The patent employs organic compounds with Formula I that can be synthesized cost-effectively and deposited as thin films. These organic materials are generally cheaper than inorganic alternatives and can be processed using solution-based methods, reducing overall manufacturing costs while achieving the desired color purity through direct emission.
3Illumination intensity
If OLEDs use complex stack structures to achieve saturated colors, then color performance can be maintained, but device reliability decreases
Solution Approach 1:
The patent merges the functions of color emission and structural simplicity by designing organic compounds that directly emit saturated colors without requiring separate filtering or conversion layers. The molecular structure in Formula I integrates the color generation function at the molecular level, reducing the number of device layers and potential failure points, thereby improving reliability while maintaining color 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 proposed compounds enhance the efficiency and cost-effectiveness of OLEDs by directly emitting saturated colors, simplifying the manufacturing process and reducing the complexity of color production in display technologies.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
Provided are compounds comprising a structure comprising at least five rings which are fused together, and which contain a central nitrogen atom, wherein at least two of the five rings are aromatic and at least one ring is a five-membered ring which is optionally aromatic. Also provided are formulations comprising these compounds. Further provided are organic light emitting devices (OLEDs) and related consumer products that utilize these compounds.