Tetrazine Electron Transport Material for Low-Voltage OLED Stability
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Solution Overview
Problem
Conventional organic light-emitting-diodes (OLEDs) face challenges with high driving voltage and low luminous efficiency due to energy barriers between electrodes and organic layers, and nitrogen-containing heterocyclic compounds used as electron transport materials are unstable, reducing durability.
Innovation Solution
A compound with a nitrogen-containing six-membered aromatic ring structure, substituted by at least three nitrogen-containing six-membered aromatic groups, is used as an electron transport material, offering high electron transport characteristics and thermal stability, thereby reducing driving voltage and improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If nitrogen-containing heterocyclic compounds are used as electron transport materials to reduce driving voltage, then electron transport capability is improved, but stability and durability are reduced
Solution Approach 1:
The patent changes the chemical structure parameters of electron transport materials by replacing conventional nitrogen-containing heterocyclic compounds (pyridine, pyrimidine rings) with tetrazine ring structures. This structural parameter change maintains electron transport capability while significantly improving thermal stability and chemical inertness, thereby resolving the contradiction between low driving voltage and durability
Solution Approach 2:
The patent employs composite material strategies by combining tetrazine core structures with various electron-withdrawing groups (cyano, carbonyl, trifluoromethyl groups) and aromatic substituents. This creates composite molecular structures that synergistically achieve both excellent electron transport properties and enhanced stability, overcoming the limitations of single-structure compounds
2Use of energy by moving object
If conventional electron transport materials are used to achieve low driving voltage, then power efficiency is improved, but thermal stability is insufficient
Solution Approach 1:
The patent modifies molecular parameters by introducing tetrazine rings with high thermal stability characteristics and incorporating electron-withdrawing groups that enhance thermal resistance. These parameter changes enable the material to maintain structural integrity at elevated temperatures while preserving efficient electron transport and low driving voltage characteristics
3Speed
If nitrogen-containing heterocyclic compounds are used as hole blocking layer to improve electron transport, then electron mobility is enhanced, but interaction with holes causes device deterioration
Solution Approach 1:
The patent converts the harmful reactivity of nitrogen-containing heterocyclic compounds with holes into a beneficial property by using tetrazine structures that are chemically inert toward holes. The electron-withdrawing groups on the tetrazine ring create a potential well for electrons while forming a barrier for holes, thus converting potential chemical degradation into effective charge separation and transport without device deterioration
Data Source
AI summary
Provided are a compound having the nitrogen-containing six-membered aromatic ring structure with high electron transport characteristic and high thermal stability, thereof electron transport material, and an OLED using the same. That is to say, a compound having the nitrogen-containing six-membered aromatic ring structure substituted by at least three nitrogen-containing six-membered aromatic groups, and an OLED material and an electron transport material comprising the compound having the nitrogen-containing six-membered aromatic ring structure. An OLED having a pair of anode and cathode and at least one organic layer including a light-emitting layer between the pair of the electrodes, wherein any of the organic layers comprises the compound having the nitrogen-containing six-membered aromatic ring structure. The compound having the nitrogen-containing six-membered aromatic ring structure according to this invention excellent in electron transport characteristic and thermal stability is suitable for an OLED material, especially an electron transport material.