Organic EL Hole-Transport Layer Structure for Low Voltage and Leakage
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Solution Overview
Problem
Conventional organic electroluminescence devices (organic EL devices) face challenges in achieving low driving voltage and suppressing lateral leakage, despite advancements in material improvements.
Innovation Solution
The device incorporates a hole-transporting zone with a first layer comprising a specific compound represented by formula (1), having a thickness of 0.10 to 3.00 nm, which includes a divalent group (X101 to X103) and an aryl or heterocyclic group (R1) for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials and layer configurations are used in organic EL devices, then device performance is maintained at current levels, but driving voltage remains high and lateral leakage cannot be suppressed
Solution Approach 1:
The patent applies parameter changes by introducing a specific compound with formula (1) containing divalent groups and aryl/heterocyclic substituents into the hole-transporting zone. This compound has optimized molecular parameters including ionization potential and electron mobility, which directly alter the electrical characteristics of the device. The thickness parameter of the first layer is precisely controlled at 0.10 to 3.00 nm to achieve optimal performance
Solution Approach 2:
The patent employs composite materials by combining the novel compound of formula (1) with other hole-transporting materials in the hole-transporting zone. The first layer contains the specific compound while the second layer contains different hole-transporting materials, creating a composite structure that leverages the advantages of each material to achieve both low driving voltage and high performance
2Device complexity
If conventional hole-transporting zone configurations are used, then device structure is simple, but lateral leakage occurs and performance is insufficient
Solution Approach 1:
The patent applies segmentation by dividing the hole-transporting zone into two distinct layers: a first layer containing the compound of formula (1) with thickness 0.10 to 3.00 nm, and a second layer with different hole-transporting materials. This segmented structure allows each layer to perform its specific function optimally, with the first layer suppressing lateral leakage and the second layer providing efficient hole transport
Solution Approach 2:
The patent implements local quality by assigning different functional properties to different parts of the hole-transporting zone. The first layer is specifically designed with the compound of formula (1) to provide lateral leakage suppression at the interface with the emitting layer, while the second layer is optimized for bulk hole transport. Each region has tailored material properties suited to its local function
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
This configuration results in an organic EL device with a low driving voltage and reduced lateral leakage, enhancing overall device performance.
Implementation Method 1
a hole-transporting zone disposed between the anode and the emitting layer, wherein the hole-transporting zone comprises a first layer and a second layer in this order from the anode side
Data Source
AI summary
An organic electroluminescence device, comprising: a cathode, an anode, an emitting layer disposed between the cathode and the anode, and a hole-transporting zone disposed between the anode and the emitting layer, wherein the hole-transporting zone contains a first layer and a second layer in this order from the anode side, the first layer contains a compound represented by the following formula (1), and the first layer has a thickness of 0.10 to 3.00 nm.