Metal-Coordinated Organic OLED Materials for Saturated Color
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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 require complex stack structures or absorption filters, which can be inefficient.
Innovation Solution
Development of a compound with a first ligand LA coordinated to a metal M, comprising specific monocyclic or polycyclic ring systems, which can be used in an OLED layer to enhance color emission, potentially eliminating the need for complex stack structures and absorption filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional methods are used to achieve saturated red, green, and blue pixel emissions, then color saturation is improved, but device complexity increases due to requiring complex stack structures or absorption filters
Solution Approach 1:
The patent extracts and eliminates the need for complex stack structures and absorption filters by using a single emissive layer with carefully designed organic compounds that directly emit saturated red, green, and blue colors. This removes unnecessary components while maintaining color saturation requirements.
Solution Approach 2:
The patent changes the chemical and structural parameters of the emissive materials to achieve different color emissions from a single layer. By modifying molecular structures, substitution patterns, and compound compositions, the patent enables direct emission of saturated colors without requiring complex optical filtering systems.
2Illumination intensity
If conventional methods with absorption filters are used, then color emission is achieved, but energy efficiency deteriorates due to light absorption and filtering losses
Solution Approach 1:
The patent removes absorption filters from the device architecture, eliminating the energy losses associated with light absorption and filtering. The system directly emits the desired colors through carefully selected emissive materials, avoiding the inefficiencies of filtering approaches.
3Device complexity
If a single emissive layer is used, then device complexity is reduced, but achieving saturated color emissions becomes more difficult
Solution Approach 1:
The patent employs composite organic materials with specific molecular structures, substitution patterns, and compositional ratios within the single emissive layer. These composite material designs enable the layer to simultaneously achieve saturated color emissions while maintaining structural simplicity.
Solution Approach 2:
The patent applies local quality by designing specific regions within the emissive layer with tailored molecular structures and compositions optimized for particular color emissions. Different compounds or molecular arrangements are placed in specific locations or configurations to achieve saturated red, green, and blue emissions from a single layer.
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 in OLEDs, simplifying the manufacturing process and improving 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 comprising a structure of Formula I,is provided. In Formula I, LA is coordinated to a metal M selected from the group consisting of Ir, Rh, Re, Ru, Os, Pt, Pd, Ag, Au, and Cu; each of moiety A, moiety B, and moiety C is a monocyclic ring or a polycyclic fused ring system; A1 is selected from the group consisting of B, N, P, P═O, P═S, Al, Ga, SiR″, GeR″, and SnR″; at least two of Y1, Y2, and Y3 are present and are a direct bond or a linker; Z is a direct bond to metal M, or Z is a direct bond or an organic linker to a ring or a polycyclic fused ring system that is coordinated to M. Formulations, OLEDs, and consumer products containing the same are also provided.