Copper Complex Emissive Dopant for OLED Color Saturation
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Solution Overview
Problem
Current organic light-emitting diode (OLED) technologies face challenges in achieving saturated colors, particularly in red, green, and blue emissions, which are essential for full-color displays, and there is a need for materials that can efficiently emit light across a wide range of wavelengths while being cost-effective and flexible.
Innovation Solution
A compound with the structure of formula (I), comprising a monovalent copper atom and specific ligands, is used as an emissive dopant in OLEDs, enabling phosphorescent emission and potentially improving the color gamut and efficiency of OLEDs by tuning the emission wavelength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional OLED materials are used, then device fabrication is simpler, but achieving saturated colors (especially red, green, and blue) is difficult
Solution Approach 1:
The patent modifies the molecular structure of emissive materials by incorporating specific ligand combinations (e.g., cyclometalating ligands with auxiliary ligands) to tune emission wavelengths and achieve saturated colors. This changes the optical parameters of the material without fundamentally altering the device architecture.
Solution Approach 2:
The invention uses composite emissive materials comprising host materials and dopant materials with specific molecular structures. The host-guest system allows for optimized color emission while maintaining device fabrication simplicity.
2Adaptability or versatility
If phosphorescent emissive materials are used to achieve full color display, then color gamut is improved, but material cost and complexity increase
Solution Approach 1:
The patent employs phosphorescent materials with specific molecular structures (e.g., iridium complexes with tailored ligands) to achieve broad color gamut coverage. By adjusting ligand types and substituents, the emission wavelength and phosphorescence efficiency are optimized for saturated red, green, and blue pixels.
3Ease of manufacture
If organic materials are used for OLED fabrication, then cost and flexibility are improved, but achieving high efficiency emission across wide wavelength range is challenging
Solution Approach 1:
The patent develops organic emissive materials with optimized molecular structures that balance solution processability (for low-cost fabrication) with high photoluminescence quantum yield and electroluminescence efficiency. Structural modifications include adjusting conjugation length, adding electron-donating or electron-withdrawing groups, and selecting appropriate host-guest combinations.
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 enhances the emission efficiency and color accuracy of OLEDs, allowing for the production of devices with improved performance and cost-effectiveness, suitable for various applications including displays and lighting panels.
Implementation Method 1
A compound with the structure of formula (I), comprising a monovalent copper atom and specific ligands, is used as an emissive dopant in OLEDs, enabling phosphorescent emission
Implementation Method 2
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 structure according to formula (I)is disclosed. In formula (I), Cu is a monovalent copper atom; *C is a carbene carbon; X1 and X2 are selected from alkyl, cycloalkyl, alkoxy, amino, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, heteroalkynyl, arylalkyl, aryloxy, aryl, heteroalkyl, heteroaryl, and combinations thereof; X1 is bonded to *C by a C atom, and X2 is bonded to *C by an N atom; X1 and X2 are optionally joined to form a ring; and Y is selected halide, alkyl, cycloalkyl, alkoxy, amino, phosphine, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, heteroalkynyl, arylalkyl, aryloxy, aryl, heteroalkyl, heteroaryl, and combinations thereof. A formulation containing compound having a structure according to formula (I), and a device with an organic layer comprising disposed between an anode and a cathode, that includes a compound having a structure according to formula (I) are also described.