Organic Electroluminescence Device Using Alkyl Hydrocarbon for Low Voltage
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Solution Overview
Problem
Current organic electroluminescence devices face challenges in achieving low driving voltage and high external quantum efficiency while maintaining durability, as existing materials and structures do not effectively combine to optimize charge injection and transfer.
Innovation Solution
Incorporating a hydrocarbon compound with an alkyl structure, specifically a saturated straight chain hydrocarbon, in conjunction with a charge transporting material within the organic layers, particularly in the light-emitting layer, to control molecular interaction and enhance charge mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a light-emitting layer consisting of only a material comprising a light-emitting material and a single bond alone is used, then light emitting efficiency is improved, but driving voltage increases due to lack of π electron bearing charge transporting capability
Solution Approach 1:
The patent combines a light-emitting material with a hydrocarbon compound having an alkyl structure (specifically a saturated straight chain hydrocarbon containing -CH2CH2- structure) to create a composite light-emitting layer. This composite structure maintains the efficiency benefits of single-bond materials while the hydrocarbon compound provides charge transporting capability through its molecular structure, thereby resolving the contradiction between efficiency and driving voltage.
Solution Approach 2:
The patent changes the chemical composition parameters of the light-emitting layer by introducing a hydrocarbon compound with specific structural characteristics (alkyl structure, saturated straight chain, -CH2CH2- unit). This parameter change enables the material to simultaneously achieve high light emitting efficiency and low driving voltage by providing both the necessary optical properties and charge transporting capability.
2Productivity
If a monocyclic saturated hydrocarbon compound with a phosphorescent material is used, then light emitting efficiency is improved, but driving voltage is not reduced
Solution Approach 1:
The patent specifies a particular local structural quality - a saturated straight chain hydrocarbon compound containing the -CH2CH2- structure - rather than just any saturated hydrocarbon. This specific local structural characteristic provides enhanced charge transporting capability that monocyclic structures lack, thereby achieving both high efficiency and reduced driving voltage simultaneously.
3Use of energy by moving object
If an organic layer having a thickness of 10 nanometers is used, then resistance is large and electric current hardly flows, but if the layer is extremely thin (several nanometers), then applied voltage lowers but the layer is too thin for practical use
Solution Approach 1:
The patent changes the electrical parameters of the organic layer by incorporating a hydrocarbon compound with specific charge transporting properties. This material modification enables the layer to maintain both low resistance and practical thickness, resolving the contradiction between voltage reduction and current flow capability.
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 reduces driving voltage, improves external quantum efficiency, and extends the device's lifespan by stabilizing the material properties and preventing decomposition.
Implementation Method 1
a light-emitting layer consisting of only a material comprising a light-emitting material and a single bond alone... a compound consisting of a single bond alone has no π electron bearing charge transporting
Implementation Method 2
organic electroluminescence device capable of converting electric energy to light and emitting light
Implementation Method 3
For the improvement of light emitting efficiency, an organic luminescence device having a light-emitting layer consisting of only a material comprising a light-emitting material and a single bond alone is described... increment in efficiency of the devices has been advanced by the use of phosphorescent materials
Data Source
AI summary
Provided is an organic electroluminescence device including: a pair of electrodes; and at least one organic layer including a light-emitting layer being provided between the pair of electrodes, wherein at least any one of the at least one organic layer contains both at least one hydrocarbon compound having an alkyl structure and a charge transporting material.