Organic Electroluminescent Element Boron-Nitrogen Dopants
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current organic electroluminescent elements lack materials with high quantum efficiency and long lifetime, particularly for light emitting layers.
Innovation Solution
Incorporating a combination of polycyclic aromatic compounds linked by boron, nitrogen, or oxygen atoms in the light emitting layer to achieve better carrier balance and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic materials are used in the light emitting layer, then the device structure can be simplified, but quantum efficiency and lifetime are insufficient
Solution Approach 1:
The patent employs composite materials by combining a host material with specific dopant materials (compounds of formula 1 or 2) in the light emitting layer. This composite approach enables achieving high quantum efficiency and long lifetime simultaneously, resolving the contradiction between reliability improvement and device complexity.
Solution Approach 2:
The patent changes the chemical structure parameters of the dopant materials by introducing specific compounds with formulae (1) and (2) that contain particular functional groups and molecular structures. This parameter change in material composition leads to improved quantum efficiency and lifetime without significantly increasing device structural complexity.
2Reliability
If a single material is used in the light emitting layer, then the manufacturing process is simpler, but carrier balance is insufficient
Solution Approach 1:
The patent uses a composite material system consisting of a host material and dopant materials (formulae 1 or 2) in specific weight ratios. This composite approach achieves good carrier balance while maintaining relatively simple manufacturing processes, as the materials can be deposited using conventional vacuum deposition techniques.
Solution Approach 2:
The patent introduces dopant materials with specific local molecular structures (formulae 1 and 2) into the light emitting layer to locally improve carrier transport properties. This local quality enhancement achieves good carrier balance without requiring complex manufacturing processes, as the dopants are simply mixed with the host material in controlled weight ratios.
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 use of polycyclic aromatic compounds as dopants in the light emitting layer enhances quantum efficiency and extends the lifetime of organic electroluminescent elements.
Implementation Method 1
an organic electroluminescent element comprising: a pair of electrodes composed of a positive electrode and a negative electrode; and a light emitting layer disposed between the pair of electrodes
Implementation Method 2
since a compound having a conjugated structure involving high energy of triplet exciton (T1) can emit phosphorescent light having a shorter wavelength
Data Source
AI summary
Provided is an organic electroluminescent element including a light emitting layer containing, as a dopant, at least two compounds selected from a compound group consisting of a polycyclic aromatic compound represented by the following general formula (1) and a multimer thereof:wherein the symbols are defined in the specification.