Pt/Pd OLED Emitters for Saturated RGB Without Absorption 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 for full color displays, and conventional methods for white OLEDs often rely on absorption filters which can be inefficient.
Innovation Solution
The development of a compound represented by Formula I, which includes platinum (Pt) or palladium (Pd) coordination compounds, is used in the organic layer of OLEDs to enhance emission capabilities, allowing for direct production of saturated colors without the need for additional filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional white OLEDs use absorption filters to produce saturated colors, then color display capability is improved, but device efficiency deteriorates due to energy loss from filtering
Solution Approach 1:
The patent extracts and eliminates the absorption filter component from the OLED structure. By developing emitter compounds that directly produce saturated red, green, and blue emissions, the solution removes the filtering step that causes energy loss, allowing the OLED to achieve color saturation through the emitter's intrinsic properties rather than post-emission filtering
Solution Approach 2:
The patent changes the emission parameters of the OLED by designing compounds with specific photophysical properties. The emitter compounds are engineered to have narrow emission bandwidths and high quantum efficiencies at specific wavelengths, enabling direct generation of saturated colors without filtering. This parameter optimization allows the system to achieve both color saturation and high efficiency simultaneously
2Illumination intensity
If conventional OLEDs use multiple emissive layers or stack structures for full color display, then color accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the color emission function into three distinct emitter compounds, each optimized for a specific color (red, green, or blue). Each compound is designed with specific molecular structures and substituents that enable it to emit only its designated color with high saturation. This segmentation allows each pixel to be self-contained with a single emitter type, eliminating the need for complex multi-layer structures or color filters while maintaining color accuracy
Solution Approach 2:
The patent creates a universal emitter platform based on the general Formula I structure that can be adapted to produce different colors by modifying substituents. The core molecular framework (containing Pt or Pd with cyclometalating ligands) serves multiple functions: it provides the emission mechanism, determines the emission color through substituent selection, and maintains high efficiency across all color variants. This multi-functionality simplifies device design by using a single emitter type for all color requirements
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 emissions, improving the performance of OLEDs in displays by eliminating the need for post-emission filtering, thereby enhancing color accuracy and efficiency.
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 of Formula I. Also provided are formulations comprising these compounds. Further provided are OLEDs and related consumer products that utilize these compounds.