Organic Electronic Device Injection Layer for Voltage Reduction
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Solution Overview
Problem
Existing organic electronic devices face challenges with high operating voltage and short device lifetime due to injection barriers and instability of low work function metals used for charge carrier injection, which also affect the efficiency and stability of OLEDs and organic solar cells.
Innovation Solution
An organic electronic device is developed with a compound of formula (I) as an electron transport matrix, which is air-stable, capable of being evaporated without decomposition, and soluble in various solvents, used in transport and injection layers to improve charge carrier injection and conductivity, reducing operating voltage and enhancing device stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If low work function metals are used for charge carrier injection, then charge carrier injection is improved, but device stability and lifetime deteriorate due to instability and oxidation of the metals
Solution Approach 1:
An organic injection layer comprising a compound of formula (I) is introduced as an intermediary between the electrode and the electron transport material. This organic layer mediates charge carrier injection while being air-stable and resistant to oxidation, thus improving injection without compromising device stability and lifetime.
Solution Approach 2:
The injection layer uses a composite material approach by combining the compound of formula (I) with an electron transport material. This composite structure provides both the low work function characteristics needed for good charge carrier injection and the air stability required for long device lifetime.
2Device complexity
If conventional electron transport materials are used, then device structure is simple, but operating voltage is high and power efficiency is low
Solution Approach 1:
The compound of formula (I) modifies key parameters of the electron transport layer, including HOMO and LUMO energy levels, to optimize charge carrier injection and transport. These parameter changes enable lower operating voltages and improved power efficiency while maintaining a relatively simple device structure.
3Productivity
If metal electrodes are used for charge carrier injection, then injection efficiency is improved, but device lifetime is reduced due to oxidation and instability of metals
Solution Approach 1:
The patent replaces unstable metal injection layers with an organic compound-based injection layer that is inherently stable and resistant to degradation. This organic layer acts as a long-lasting alternative to the short-lived metal-based injection layers, maintaining high injection efficiency throughout the device lifetime.
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 use of the compound in the organic electronic device significantly improves the lifetime and reduces the operating voltage, leading to higher power efficiency and stability, particularly in OLEDs and organic solar cells.
Implementation Method 1
charge carriers are injected into the organic material and a charge transport takes place from holes or electrons to a recombination zone
Implementation Method 2
OLEDs are based on the principle of electroluminescence in which electron-hole pairs, so-called excitons, recombine under the emission of light
Implementation Method 3
The subsequent radiant recombination of excitons causes the emission of the visible useful light emitted by the light-emitting diode
Implementation Method 4
a charge transport takes place from holes or electrons to a recombination zone (light emitting layer) in the organic layer
Data Source
AI summary
The present invention relates to an organic electronic device, comprising a first electrode, a second electrode, and a substantially organic layer comprising a compound according to formula (I) between the first and the second electrode:wherein A1 is a C6-C20 arylene and each of A2-A3 is independently selected from a C6-C20 aryl, wherein the aryl or arylene may be unsubstituted or substituted with groups comprising C and H or with a further LiO group, provided that the given C count in an aryl or arylene group includes also all substituents present on the said group.