OLED Electron Transporting Region Using Rare Earth Telluride
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Solution Overview
Problem
Organic light emitting diode (OLED) display devices face challenges in maintaining electron injection efficiency and stability against oxidation, particularly when exposed to the atmosphere, which affects driving voltage and current efficiency.
Innovation Solution
Incorporating a tellurium compound of a rare earth metal, such as LaTe, CeTe, or YbTe, in the electron transporting region of the OLED, with a permittivity range of 5 to 12 and electronic polarizability of 8 to 15, along with a second electrode alloy of Ag, Mg, and Yb, to enhance electron injection and reduce oxidation effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electron transporting materials are used in OLED, then device structure is simple, but electron injection efficiency deteriorates and oxidation resistance is poor
Solution Approach 1:
The patent uses composite materials by combining tellurium compounds of rare earth metals with conventional electron transporting materials. This composite approach improves electron injection efficiency and oxidation resistance while maintaining manageable device structure, directly resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The patent changes the chemical and physical parameters of the electron transporting region by introducing tellurium compounds with specific properties (permittivity range of 5 to 12, electronic polarizability of 8 to 15). This parameter modification enhances electron injection efficiency without excessively complicating the device structure.
2Reliability
If conventional electron transporting materials are used in OLED, then manufacturing process is simple, but stability against oxidation deteriorates when exposed to atmosphere
Solution Approach 1:
The composite material system combines tellurium compounds with conventional electron transporting materials, providing superior oxidation resistance. The manufacturing process remains relatively simple as the new material can be integrated into existing OLED fabrication processes, thus resolving the contradiction between reliability and ease of manufacture.
Solution Approach 2:
The tellurium compound acts as an intermediary material between the electrode and the emission layer, providing oxidation protection while facilitating electron transport. This intermediary approach improves oxidation resistance without significantly complicating the manufacturing process.
3Reliability
If tellurium compound of rare earth metal is added to electron transporting region, then electron injection efficiency is improved, but material cost increases
Solution Approach 1:
The patent optimizes the concentration and properties of tellurium compounds to achieve the desired electron injection efficiency at minimal cost. By carefully controlling the permittivity (5-12) and electronic polarizability (8-15) parameters, the patent achieves high performance while managing material costs.
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 solution improves the reliability and stability of the OLED by maintaining excellent electron injection efficiency and reducing physical property deterioration due to atmospheric exposure, resulting in improved light emitting efficiency and consistent performance.
Implementation Method 1
A permittivity of the tellurium compound of the rare earth metal may be in a range of 5 to 12
Implementation Method 2
An electronic polarizability of the tellurium compound of the rare earth metal may be in a range of 8 to 15
Implementation Method 3
electrons injected from one electrode and holes injected from another electrode are combined with each other in a light emitting layer thereby generating excitons, and energy is outputted from the excitons to emit light
Data Source
AI summary
A light emitting diode including a first electrode; a second electrode overlapping the first electrode; an emission layer positioned between the first electrode and the second electrode; and an electron transporting region positioned between the second electrode and the emission layer, wherein the electron transporting region includes a tellurium compound of a rare earth metal.