OLED Emissive Compounds for Direct Saturated Color Emission
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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, with conventional methods relying on absorption filters for white light emission leading to inefficiencies.
Innovation Solution
Development of a compound with a first ligand LA comprising a polycyclic fused ring system, coordinated to a metal M, and substituted with various functional groups, which can be used in an organic layer of OLEDs to directly emit specific colors without the need for filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If absorption filters are used to produce saturated colors from white light, then color saturation is improved, but device complexity and energy efficiency deteriorate
Solution Approach 1:
The patent extracts and eliminates the absorption filter components from the OLED structure. Instead of using white light emission with filters, the invention directly emits saturated colors through specially designed organic compounds in the emissive layer, removing the unnecessary filter layers and simplifying the device structure.
Solution Approach 2:
The conventional approach is inverted: instead of generating white light and filtering it to obtain saturated colors, the patent directly generates saturated colors through the emissive properties of specially designed organic compounds. This inversion eliminates the need for filters and improves both structural simplicity and energy efficiency.
2Illumination intensity
If absorption filters are used to produce saturated colors, then color saturation is improved, but energy efficiency deteriorates
Solution Approach 1:
The patent removes the energy-wasting absorption filter components from the system. By directly emitting saturated colors through the emissive layer, the invention eliminates the energy loss associated with filtering white light, thereby improving overall energy efficiency.
Solution Approach 2:
The organic compounds in the emissive layer are designed to self-generate saturated colors through their inherent photophysical properties. The molecules are structured to emit specific wavelengths directly without requiring external filtering, making the system self-sufficient and energy-efficient.
3Ease of manufacture
If conventional materials are used in OLEDs, then manufacturing simplicity is maintained, but performance and color saturation deteriorate
Solution Approach 1:
The patent modifies the molecular parameters and chemical structure of the organic materials used in the emissive layer. By changing the chemical composition and molecular architecture of the compounds, the invention achieves saturated color emission while maintaining compatibility with existing OLED manufacturing processes.
Solution Approach 2:
The invention employs specially designed composite organic materials with specific molecular structures that combine the desired optical properties for saturated color emission with manufacturing feasibility. These composite materials integrate multiple functional groups and moieties to achieve both performance and manufacturability.
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 direct emission of saturated colors, improving efficiency and reducing the complexity of OLED structures, thereby enhancing display performance.
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 having a first ligand LA of Formula Iis provided. In Formula I, moiety A is a polycyclic fused ring system, wherein each ring of the polycyclic fused ring system is independently a 5-membered to 10-membered carbocyclic or heterocyclic ring and at least one of the following is true: (i) RA comprises a non-aromatic heterocyclic ring AH, or (ii) two RA are joined to form a non-aromatic heterocyclic ring A′ fused to moiety A, wherein the non-aromatic heterocyclic ring comprises at least one O, S, or N ring atom. Formulations, OLEDs and consumer products containing the compound are also provided.