OLED Electron Injection Layer with Calcium and Composite Electrode
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Solution Overview
Problem
Conventional liquid crystal display (LCD) technologies face limitations such as requiring a backlight, slow response speed, and restricted viewing angles, prompting the need for a more efficient self-emitting display solution.
Innovation Solution
An organic light emitting element is designed with a first and second electrode facing each other, an emission layer in between, and an electron injection layer containing Ca, with the second electrode composed of materials like Ag, Al, and Mg, and Yb, Ca, Sm, Eu, Tb, Sr, Ba, and Ce, along with organic transport layers and auxiliary layers for enhanced light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If LCD technology is used, then the display device can be made thinner and lighter, but it requires an additional backlight and has slow response speed and restricted viewing angle
Solution Approach 1:
The organic light emitting element generates its own light through electroluminescence in the emission layer, eliminating the need for a separate backlight unit. The element injects electrons from the second electrode through the electron injection layer and holes from the first electrode through the hole injection layer, which combine in the emission layer to produce light autonomously.
2Use of energy by moving object
If conventional electron injection layers are used, then the device structure is simpler, but the luminance efficiency and lifespan are limited
Solution Approach 1:
The second electrode is constructed as a composite structure with a base layer (first electrode material: Ag, Al, or Mg) and an overlayer (second electrode material: Yb, Ca, Sm, Eu, Tb, Sr, Ba, La, or Ce). This composite configuration optimizes both electron injection efficiency and device stability, achieving high luminance efficiency and extended lifespan.
3Adaptability or versatility
If the emission layer alone is used for light emission, then the structure is simpler, but the viewing angle and contrast are restricted
Solution Approach 1:
The light emitting element is divided into functionally distinct layers: a first electrode with hole injection layer, an emission layer for light generation, an electron transport layer for charge carrier management, and a second electrode with electron injection layer. This segmentation allows each layer to be optimized for its specific function, achieving wide viewing angle and excellent contrast.
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 organic light emitting element achieves improved luminance efficiency and extended lifespan, overcoming the limitations of LCDs by providing a wide viewing angle and fast response time, as demonstrated in the efficiency-luminance characteristics graph.
Implementation Method 1
an electron injection layer between the second electrode and the emission layer. The electron injection layer includes Ca
Implementation Method 2
the organic light emitting element forms excitons from combination of electrons injected from one electrode and holes injected from another electrode in an emission layer, and the excitons emit energy such that light is emitted
Implementation Method 3
an electron transport layer between the emission layer and the electron injection layer and a hole transport layer between the emission layer and the first electrode
Data Source
AI summary
An organic light emitting element is provided. An organic light emitting element according to an exemplary embodiment includes: a first electrode and a second electrode that face each other; an emission layer provided between the first electrode and the second electrode; and an electron injection layer provided between the second electrode and the emission layer, wherein the electron injection layer includes Ca, and the second electrode includes a first material including at least one of Ag, Al, and Mg and a second material including at least one of Yb, Ca, Sm, Eu, Tb, Sr, Ba, La, and Ce.