OLED Electron Injection Layer Dipole Material Work Function
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid-crystal display (LCD) technologies are limited by their need for an additional backlight, slow response time, and narrow viewing angle, making them unsuitable for lightweight and thin personal devices like computers and televisions.
Innovation Solution
An organic light emitting diode (OLED) structure is developed, comprising a first electrode, a second electrode, an emission layer, and an electron injection layer with a metal having a work function of 4.0 eV or less and a dipole material with a higher dipole moment than LiF, along with an oxide having relative permittivity of 10 or more, enhancing electron injection and light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional LCD technology is used, then the display device can be manufactured with existing technology, but the response time is slow and viewing angle is narrow
Solution Approach 1:
The patent removes the backlight unit and other liquid crystal components from the display structure, extracting only the essential light-emitting elements (OLEDs) to achieve fast response time and wide viewing angle while simplifying the overall device complexity
Solution Approach 2:
The patent replaces the mechanical liquid crystal rotation system with electro-luminescent OLED elements that emit light directly through electrical excitation, eliminating the need for complex liquid crystal alignment mechanisms and backlight systems
2Length of stationary object
If LCD technology is used, then the display can be produced with current manufacturing processes, but an additional backlight is required increasing device thickness
Solution Approach 1:
The patent extracts and removes the backlight unit, diffusers, and other auxiliary components from the display structure, retaining only the essential OLED light-emitting elements to achieve thin profile while reducing structural complexity
Solution Approach 2:
The patent merges the light source function and display function into a single integrated OLED structure, eliminating the need for separate backlight units and optical layers, thereby reducing thickness and simplifying the overall display structure
3Productivity
If traditional electron injection layers are used, then the manufacturing process is simple, but electron injection efficiency is insufficient
Solution Approach 1:
The patent employs composite electron injection layers combining multiple materials (e.g., LiF, Alq3, BCP) with different functional properties to achieve synergistic electron injection enhancement, where each material contributes specific characteristics such as electron affinity, mobility, or interface compatibility
Solution Approach 2:
The patent applies different materials with optimized properties to specific regions or layers within the electron injection structure, tailoring the local electronic characteristics to maximize electron injection efficiency at each interface while managing overall structural complexity
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 improves light emitting efficiency and lifespan, offering a wide viewing angle, fast response time, and high contrast, suitable for thin display devices.
Implementation Method 1
a dipole material including a first component and a second component having different polarities. The dipole material may have a dipole moment that is higher than that of LiF
Implementation Method 2
the electron injection layer including a metal having a work function of 4.0 eV or less
Implementation Method 3
The electron injection layer may include an oxide having relative permittivity of 10 or more
Implementation Method 4
an emission layer between the first electrode and the second electrode
Data Source
AI summary
An 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 an electron injection layer between the second electrode and the emission layer, the electron injection layer including a metal having a work function of 4.0 eV or less and a dipole material including a first component and a second component having different polarities.