Dendron Phosphorescent Composition for High Efficiency OLEDs
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Solution Overview
Problem
Light emitting devices using existing compositions have insufficient external quantum efficiency.
Innovation Solution
A composition comprising a phosphorescent compound with an emission spectrum between 380 nm and 495 nm, two or more phosphorescent compounds with emission spectra between 495 nm and 750 nm having a dendron, and a specific compound structure, enhancing the external quantum efficiency of light emitting devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing phosphorescent compounds without dendron are used in light emitting devices, then the device structure is simple, but the external quantum efficiency is insufficient
Solution Approach 1:
The patent uses composite phosphorescent materials comprising dendron-containing phosphorescent compounds combined with specific host materials. The dendron structure (containing multiple aromatic rings and heteroatoms)复合 with the phosphorescent metal complex creates a composite material that achieves high external quantum efficiency while maintaining manageable device complexity
Solution Approach 2:
The patent changes the molecular structure parameters of the phosphorescent compounds by introducing dendron groups with specific aromatic ring configurations and heteroatom compositions. This structural parameter change enhances the phosphorescent properties and external quantum efficiency without overly complicating the device structure
2Reliability
If phosphorescent compounds with dendron structure are used, then the external quantum efficiency improves, but the molecular structure complexity increases
Solution Approach 1:
The dendron structure is introduced locally at specific positions on the phosphorescent compound molecule rather than throughout the entire structure. This localized modification enhances external quantum efficiency while keeping the overall molecular structure manageable and synthesis feasible
3Ease of manufacture
If conventional light emitting materials are used, then the manufacturing process is simple, but the luminance life is insufficient
Solution Approach 1:
The dendron-containing phosphorescent compounds act as intermediaries that facilitate better energy transfer and stabilization in the light emitting layer. This intermediary structure enhances the stability and luminance life of the device while maintaining compatibility with conventional manufacturing processes
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 significantly improves the external quantum efficiency and luminance life of light emitting devices, particularly in light emitting layers.
Implementation Method 1
a phosphorescent compound (B) having an emission spectrum the maximum peak wavelength of which is between 380 nm or more and less than 495 nm... two or more phosphorescent compounds (DGR) having an emission spectrum the maximum peak wavelength of which is between 495 nm or more and less than 750 nm
Data Source
AI summary
A composition comprising a phosphorescent compound having an emission spectrum the maximum peak wavelength of which is between 380 nm or more and less than 495 nm, having no dendron and represented by the formula (1'), two or more phosphorescent compounds having an emission spectrum the maximum peak wavelength of which is between 495 nm or more and less than 750 nm and having a dendron, and a specific compound: wherein M represents an iridium atom or the like, n1 represents an integer of 1 or more, n2 represents an integer of 0 or more, E1 and E2 represent a carbon atom or the like, the ring R1' represents a diazole ring, the ring R2 represents a 6-membered aromatic hydrocarbon ring or the like, and A1-G1-A2 represents an anionic bidentate ligand.