OLED Hole Transport Layer Dipole Material Injection
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Solution Overview
Problem
Conventional liquid crystal display devices have limitations in response speed and viewing angle due to their requirement for a separate backlight, making them less suitable for applications requiring weight reduction and slimness, such as modern monitors and televisions.
Innovation Solution
An organic light emitting diode (OLED) structure is developed, comprising a first and second electrode with an emission layer and a hole transport layer made of organic material and dipole material, where the dipole material includes components with differing polarities and work functions, enhancing hole injection and transport efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If liquid crystal display is used to achieve weight reduction and slimness, then the device becomes lighter and thinner, but response speed is limited and viewing angle is restricted
Solution Approach 1:
The patent replaces the liquid crystal display mechanism with an organic light emitting diode (OLED) structure. The OLED uses organic compounds that emit light when electric current passes through them, eliminating the need for liquid crystals and backlight systems. This substitution of the fundamental display mechanism enables both weight reduction and improved response speed, as OLEDs are self-luminous and do not require the mechanical liquid crystal rotation or backlight systems that limit LCD response times.
Solution Approach 2:
The patent modifies the material parameters by using specific organic compounds with optimized work functions and dipole moments. The hole transport layer uses organic materials with work functions of 4.0 eV or more, and the dipole material has a dipole moment of 5 Debye or greater. These parameter changes in material properties enable efficient charge transport and light emission, achieving rapid response times while maintaining the lightweight structure.
2Weight of moving object
If liquid crystal display is used to achieve weight reduction and slimness, then the device becomes lighter and thinner, but viewing angle is limited
Solution Approach 1:
The patent replaces the liquid crystal display mechanism with an organic light emitting diode (OLED) structure. The OLED uses organic compounds that emit light when electric current passes through them, eliminating the need for liquid crystals and backlight systems. This substitution of the fundamental display mechanism enables both weight reduction and improved response speed, as OLEDs are self-luminous and do not require the mechanical liquid crystal rotation or backlight systems that limit LCD response times.
3Device complexity
If conventional hole transport layer is used, then the structure is simple, but hole injection and transport efficiency is insufficient
Solution Approach 1:
The patent creates a composite hole transport layer by combining organic materials with dipole materials. The organic material provides the base structure for charge transport, while the dipole material (with a dipole moment of 5 Debye or greater) enhances the hole injection efficiency by creating favorable electric field conditions at the interface. This composite structure achieves high hole injection efficiency without significantly increasing device complexity, as the dipole material is integrated into the existing layer structure.
Solution Approach 2:
The patent modifies the material parameters by using specific organic compounds with optimized work functions and dipole moments. The hole transport layer uses organic materials with work functions of 4.0 eV or more, and the dipole material has a dipole moment of 5 Debye or greater. These parameter changes in material properties enable efficient charge transport and light emission, achieving rapid response times while maintaining the lightweight structure.
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 OLED structure achieves improved luminous efficiency and extended lifespan by optimizing hole injection and transport, while also providing a wide viewing angle and rapid response time, overcoming the limitations of traditional display technologies.
Implementation Method 1
the dipole material including a first component and a second component, the first component having a polarity different from that of the second component and the first component and the second component being combined with each other
Implementation Method 2
the first component may include a metal or a non-metal and has a work function of 4.0 eV or more
Implementation Method 3
the organic light emitting diode emits light by combining electrons injected from one electrode with holes injected from another electrode in an emission layer to form excitons and letting the excitons emit energy
Data Source
AI summary
An organic light emitting diode and an organic light emitting display device, the organic light emitting diode including a first electrode and a second electrode facing each other; an emission layer between the first electrode and the second electrode; and a hole transport layer between the first electrode and the emission layer, wherein the hole transport layer includes an organic material and a dipole material, the dipole material including a first component and a second component, the first component having a polarity different from that of the second component and the first component and the second component being combined with each other.