Organic Electric Element Host Material Blend for Charge Balance
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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 LUMO and HOMO levels of host materials significantly impact efficiency and lifespan, and there is a need for improved energy transfer methods from host to dopant materials.
Innovation Solution
Incorporating a specific second host material in combination with a first host material to control the HOMO level, reducing energy barriers and maximizing charge balance in the emitting layer, thereby enhancing efficiency and lifespan of organic electronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single host material is used in the emitting layer, then the device structure is simple, but the charge carrier mobility and oxidation stability are low
Solution Approach 1:
The patent uses a composite host material system consisting of a first host material (formula 1) and a second host material (formula 2) in specific weight ratios (30-70 wt% and 70-30 wt% respectively). This composite approach combines the advantages of both materials to achieve high charge carrier mobility and oxidation stability while maintaining balanced charge transport properties in the emitting layer.
2Use of energy by moving object
If the HOMO level is not optimized, then the energy barrier is high, but the device structure remains simple
Solution Approach 1:
The patent optimizes the HOMO level of the host material combination to be within the range of 5.8-6.5 eV by carefully selecting and combining the first host material (formula 1) and second host material (formula 2) with specific structural parameters. This parameter optimization reduces the energy barrier for charge carrier injection and transport, improving device efficiency without requiring complex additional components.
3Productivity
If charge balance is not maximized, then the efficiency is low, but the emitting layer composition is simple
Solution Approach 1:
The patent creates local quality optimization in the emitting layer by distributing the first and second host materials with different properties in specific proportions (30-70 wt% and 70-30 wt%). This local composition control ensures optimal charge balance and energy transfer characteristics throughout the emitting layer, maximizing luminous efficiency through improved charge carrier balance and reduced recombination losses.
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 proposed 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
there is a need for improved energy transfer methods from host to dopant materials
Data Source
AI summary
Provided are an organic electric element for achieving high light-emitting efficiency, low driving voltage and improved lifespan, which comprises a mixture of a compound of Formula (1) and a compound of Formula (2) as a phosphorescent host material; and an electronic device thereof.