Deuterated Host Composition for Low-Voltage Organic EL Emission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic electroluminescence devices face challenges in maintaining the advantages of multiple materials used in combination, often leading to suboptimal performance, high drive voltage, and short device lifetime.
Innovation Solution
The use of a specific combination of two host materials, one of which contains deuterium, in the emitting layer of the organic electroluminescence device, comprising a cathode, anode, and an emitting layer with a dopant material, enhances device performance by reducing drive voltage and increasing external quantum efficiency while extending the device's lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two or more materials are used in combination in an organic layer, then the advantage of features of each material can be utilized, but the advantages are not necessarily maintained and performance may be deteriorated
Solution Approach 1:
The patent applies parameter changes by incorporating deuterium atoms into the host material structure. This isotopic substitution modifies the physical and chemical parameters of the host material, leading to improved exciton management and reduced degradation while maintaining the benefits of multi-material combinations
Solution Approach 2:
The patent uses composite materials by combining deuterated host materials with specific dopant materials in the emitting layer. This composite approach allows the deuterated host to provide enhanced stability and exciton confinement, while the dopant materials contribute their specific optical and electrical properties, achieving both versatility and reliability
2Reliability
If conventional materials are used in the emitting layer, then the device can operate, but the drive voltage is high and the lifetime is short
Solution Approach 1:
The patent applies parameter changes through deuterium substitution in the host material structure. This isotopic modification changes the vibrational frequencies and binding energies, resulting in reduced non-radiative decay and improved device lifetime while maintaining operational reliability
Solution Approach 2:
The patent converts the typically harmful effect of exciton-polaron interactions and material degradation into a benefit through deuterium substitution. The deuterated structure reduces degradation pathways and transforms exciton management into an advantageous mechanism for extended device lifetime
3Reliability
If conventional materials are used in the emitting layer, then the device can operate, but the drive voltage is high
Solution Approach 1:
The patent applies parameter changes by using deuterium substitution to modify the energy levels and charge transport properties of the host material. This results in improved charge injection efficiency and reduced drive voltage while maintaining device operational reliability
Solution Approach 2:
The deuterated host material acts as an intermediary that facilitates efficient charge transport and exciton formation. It mediates between the electrodes and the dopant materials, improving charge injection and reducing the drive voltage required for device operation
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 drive voltage, high external quantum efficiency, and a prolonged lifespan.
Implementation Method 1
When voltage is applied to an organic electroluminescence device (hereinafter, referred to as an organic EL device), holes and electrons are injected into an emitting layer from an anode and a cathode, respectively. Then, thus injected holes and electrons are recombined in the emitting layer, and excitons are formed therein.
Data Source
Figure 1
AI summary
An organic electroluminescence device, comrpising a cathode, an anode, and at least one emitting layer disposed between the cathode and the anode, wherein the emitting layer contains a first host material, a second host material, and a dopant material, wherein the first host material is a compound represented by the following formula (1), the second host material is a compound represented by the following formula (2), and one or more selected from the group consisting of the compound represented by the formula (1) and the compound represented by the formula (2) have at least one deuterium atom.