Dendron Phosphorescent Compounds for Extended Luminance Life
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Solution Overview
Problem
Light emitting devices using compositions with blue, green, and red phosphorescent compounds without dendrons have insufficient luminance life.
Innovation Solution
A composition comprising phosphorescent compounds with specific emission spectra and dendron structures, along with a polymer compound, to enhance luminance life in light emitting devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If phosphorescent compounds without dendrons are used in the light emitting layer, then the device can be manufactured with simpler materials, but the luminance life is insufficient
Solution Approach 1:
The patent uses composite phosphorescent compounds that combine dendron structures with phosphorescent moieties. The dendron provides structural stability and extended lifespan, while the phosphorescent portion maintains light emission functionality. This composite approach resolves the contradiction by integrating both durability and manufacturability.
Solution Approach 2:
The patent modifies the molecular structure parameters of phosphorescent compounds by introducing dendron groups with specific branching patterns and molecular weights. These parameter changes enhance the stability and luminance life of the light emitting layer while maintaining compatibility with standard manufacturing processes.
2Duration of action of stationary object
If phosphorescent compounds with dendron structures are used, then the luminance life is improved, but the molecular complexity increases
Solution Approach 1:
The phosphorescent compounds are segmented into distinct functional modules: dendron groups for stability and phosphorescent moieties for light emission. This segmentation allows the complex molecular structure to be designed systematically, with each segment performing a specific function, thereby managing complexity while achieving improved luminance life.
Solution Approach 2:
The dendron structures serve multiple functions simultaneously: they provide structural stability for extended luminance life, facilitate proper packing in the light emitting layer, and maintain compatibility with device fabrication processes. This multi-functionality reduces the need for additional components, managing overall system complexity.
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 composition provides a light emitting device with improved luminance life by utilizing phosphorescent compounds with emission spectra between 400 nm and 680 nm and a polymer compound, optimizing emission properties.
Implementation Method 1
a phosphorescent compound having an emission spectrum the maximum peak wavelength of which is between 400 nm or more and less than 480 nm and having a dendron (DB) and a phosphorescent compound having an emission spectrum the maximum peak wavelength of which is between 480 nm or more and less than 680 nm and having a dendron (DGR)
Data Source
AI summary
A composition is provided containing a first phosphorescent compound (DB) having an emission spectrum whose maximum peak wavelength is from 400 nm to less than 480 nm and having a dendron and a second phosphorescent compound (DGR) having an emission spectrum whose maximum peak wavelength is from 480 nm to less than 680 nm and having a dendron.