Phosphorescent Host Material Heteroatom Combination for OLED Efficiency
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Solution Overview
Problem
Current organic electronic elements face challenges with low charge carrier mobility and oxidation stability, particularly in phosphorescent host materials, where the energy transfer from host to dopant materials affects efficiency and lifespan, and there is a need for improved host materials for emitting layers.
Innovation Solution
A specific combination of a first and second host material is used in the emitting layer of a phosphorescent organic electronic element to control the HOMO level, reducing energy barriers and maximizing charge balance, thereby enhancing efficiency and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a 5-membered cyclic compound with same heteroatom is used, then the synthesis is simplified, but charge carrier mobility and oxidation stability are low
Solution Approach 1:
The patent changes the heteroatom parameter in the 5-membered cyclic compound from a single type (N, O, or S) to a combination of different heteroatoms (N, O, and S together). This parameter change resolves the contradiction by enabling both reasonable synthesis complexity and improved charge carrier mobility and oxidation stability through the synergistic effects of multiple heteroatoms.
Solution Approach 2:
The patent creates a composite heterocyclic structure by combining multiple heteroatoms (N, O, S) within the 5-membered cyclic compound. This composite approach allows the material to exhibit enhanced electronic properties and oxidation stability while maintaining synthetic feasibility, thus resolving the technical contradiction.
2Force
If the HOMO level of host material is not controlled, then the energy barrier is high, but charge balance and efficiency are reduced
Solution Approach 1:
The patent optimizes the HOMO level parameter of the host material by carefully selecting and combining heteroatoms (N, O, S) in the 5-membered cyclic compound. This parameter optimization simultaneously reduces the energy barrier for charge injection and improves charge balance and device efficiency, resolving the contradiction between energy barrier height and productivity.
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 solution achieves high luminous efficiency and low driving voltage with improved device lifespan by optimizing the energy transfer and charge balance in the emitting layer.
Implementation Method 1
organic light emitting phenomenon refers to a phenomenon that converts electronic energy into light energy by using an organic material
Implementation Method 2
the energy transfer from host to dopant materials affects efficiency and lifespan
Data Source
AI summary
Provided are an organic electric element comprising as a phosphorescent host material, a mixture of the compounds of Formula (1) and Formula (2), and an organic electronic device or apparatus thereof for achieving a high luminous efficiency, a low driving voltage, and an improved lifespan.