Diphenylfluorenyl Organic Layer Material for Low-Voltage OLEDs
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Solution Overview
Problem
Existing organic electroluminescent elements face challenges in achieving high efficiency and long lifespan, with driving voltage being a critical factor that affects both efficiency and life span, and these issues are exacerbated as display sizes increase.
Innovation Solution
The use of a compound represented by a specific formula, which can be incorporated into the organic material layer to optimize energy levels, T1 values, and inherent material properties, thereby improving luminous efficiency and reducing driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If efficiency is increased, then driving voltage is relatively lowered and life span increases, but efficiency cannot be maximized only by simply improving the organic material layer
Solution Approach 1:
The patent introduces a specific compound with formula (1) that has optimized energy level parameters (HOMO: -5.8 to -6.2 eV, LUMO: -2.0 to -2.4 eV) and T1 value (2.3 to 3.5 eV). By changing the molecular structure parameters of the organic compound, the patent achieves better energy level alignment with adjacent layers, improving efficiency without requiring complex multilayer modifications
Solution Approach 2:
The patent uses a composite approach by combining the novel compound of formula (1) with specific host materials (e.g., mCP, TCTA, TAPC) and dopants (e.g., Ir(ppy)3, Eu(III) complexes). This composite material strategy optimizes the overall layer performance through synergistic effects, achieving high efficiency and long lifespan without increasing structural complexity
2Duration of action of stationary object
If driving voltage is lowered to reduce Joule heating and extend life span, then efficiency improves, but achieving optimal energy levels and T1 values among respective layers is required
Solution Approach 1:
The patent specifies precise parameter ranges for the compound: HOMO level of -5.8 to -6.2 eV, LUMO level of -2.0 to -2.4 eV, and T1 value of 2.3 to 3.5 eV. These parameter optimizations ensure proper energy level alignment with hole transport and electron transport layers, enabling low driving voltage operation that reduces Joule heating and extends device lifespan
Solution Approach 2:
The compound of formula (1) acts as an intermediary material between the hole transport layer and electron transport layer. Its optimized energy levels serve as a bridge that facilitates efficient charge carrier injection and transport, enabling low-voltage operation without requiring complex optimization of all adjacent layers
3Area of stationary object
If display size is increased, then efficiency and life problems are exacerbated, but the compound addresses these issues through optimized material properties
Solution Approach 1:
The patent optimizes key material parameters including HOMO level (-5.8 to -6.2 eV), LUMO level (-2.0 to -2.4 eV), and T1 value (2.3 to 3.5 eV) of the compound. These parameter optimizations ensure stable charge carrier injection and transport even in large-area displays, preventing efficiency roll-off and maintaining long operational lifespan across the entire display area
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 compound lowers the driving voltage and enhances the luminous efficiency and lifetime of the organic electric element, addressing the efficiency and lifespan challenges faced by existing technologies.
Implementation Method 1
Generally, organic luminescence refers to the phenomenon of converting electrical energy into light energy using organic materials
Implementation Method 2
the crystallization of an organic material due to Joule heating generated during operation is reduced as driving voltage is lowered
Data Source
AI summary
Provided are a compound represented by Formula 1, an organic electric element including a first electrode, a second electrode, and an organic material layer between the first electrode and the second electrode, and an electronic device thereof, wherein the compound represented by Formula 1 is included in the organic material layer, thereby the driving voltage of the organic electric element can be lowered, and the luminous efficiency and life time can be improved.