Red Phosphorescent Compound for OELD Color Purity
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Solution Overview
Problem
Current red phosphorescent compounds for organic electroluminescent devices (OELDs) face challenges in achieving high color purity, luminescence efficiency, and long lifetime, as higher color purity leads to decreased relative spectral sensitivity and luminance efficiency.
Innovation Solution
A red phosphorescent compound with a specific host and dopant structure, represented by Formula 2, where R1-R7 are selected from hydrogen, alkyl, and pyrrole groups, and X and Y from hydrogen and fluorine-substituted alkyl, enhancing color purity and luminescence efficiency by incorporating alkyl and pyrrole substitutions in phenyl and quinoline parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the color purity of red phosphorescent material is increased, then the CIE X index increases, but the relative spectral sensitivity and luminance efficiency decrease
Solution Approach 1:
The patent changes the chemical composition parameters of the phosphorescent material by incorporating specific host materials (BAlq, Alq3, Bpy-OXD) and dopant materials with defined molecular structures containing carbazole, triphenylene, and pyridine groups. This compositional parameter change achieves high color purity (CIE X>0.65) while maintaining luminance efficiency through optimized material interactions
Solution Approach 2:
The patent creates a composite phosphorescent material system combining host materials (BAlq, Alq3, Bpy-OXD) with dopant materials containing specific functional groups. This composite structure enables simultaneous achievement of high color purity and luminance efficiency by leveraging the complementary properties of different materials in the composite system
2Illumination intensity
If the color purity of red phosphorescent material is increased, then the CIE X index increases, but the lifetime of the OELD decreases
Solution Approach 1:
The patent modifies the molecular structure parameters of the phosphorescent materials by selecting host materials with specific properties (BAlq, Alq3, Bpy-OXD) and dopants containing carbazole, triphenylene, and pyridine groups. This parameter optimization achieves high color purity while extending device lifetime through improved material stability and reduced degradation
Solution Approach 2:
The patent develops a composite phosphorescent system where host materials (BAlq, Alq3, Bpy-OXD) and dopant materials with specific functional groups work synergistically. This composite approach maintains high color purity while enhancing lifetime through the stabilizing effects of the composite material structure
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 red phosphorescent compound achieves high color purity (CIE X index > 0.65), high luminescence efficiency, and extended lifetime, improving the performance of OELDs with increased brightness and prolonged operational hours.
Implementation Method 1
A red phosphorescent compound having high color purity, high luminescent efficiency and improved lifetime
Data Source
AI summary
A red phosphorescent compound, includes a host material being capable of transporting an electron or a hole; and a dopant material represented by the following formula 1:wherein each of R1 to R4 is selected from the group consisting of hydrogen atom (H), C1 to C6 alkyl and C1 to C6 alkoxy, and at least one of R1 to R4 is C1 to C6 alkyl, and wherein each of R5 to R7 is selected from the group consisting of hydrogen, C1 to C6 alkyl and pyrrole, and at least one of R5 to R7 is pyrrole, and wherein each of X and Y is selected from the group consisting of H, non-substituted C1 to C6 alkyl and C1 to C6 alkyl substituted by fluorine.