1,3,5-Triazine Derivative Electron Transport Material for OLEDs
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Solution Overview
Problem
Organic electroluminescent devices have high driving voltage and low efficiency, leading to high power consumption and short lifetime due to the properties of electron transport materials, particularly the lack of effective substitutes for Tris(8-quinolinolato)-aluminum (III) (Alq) as electron transport materials.
Innovation Solution
A specific 1,3,5-triazine derivative with substituents such as pyrazyl, pyrimidyl, quinoxalyl, quinazolyl, quinolyl, or isoquinolyl groups is developed, which forms an amorphous thin film and is used as an electron transport material in organic electroluminescent devices, reducing driving voltage and enhancing lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electron transport materials (such as Alq, oxadiazole derivatives, quinoxaline derivatives) are used, then the device structure is established, but the driving voltage is high and the lifetime is short
Solution Approach 1:
The patent applies parameter changes by modifying the molecular structure of electron transport materials through specific chemical substitutions. The invention introduces compounds with particular heterocyclic groups (pyrazyl, pyrimidyl, quinoxalyl, quinazolyl, quinolyl, or isoquinolyl groups) at defined positions on the triazine ring, which fundamentally changes the electrical and optical parameters of the material, resulting in reduced driving voltage and improved device lifetime.
Solution Approach 2:
The patent employs composite materials by creating new organic compounds that combine triazine core structures with multiple heterocyclic substituents. These composite molecular structures integrate the beneficial properties of different heterocyclic groups to achieve superior electron transport performance, lower driving voltage, and enhanced device stability compared to conventional single-function materials.
2Power
If conventional electron transport materials are used, then the device can operate, but the efficiency is low and driving voltage is high
Solution Approach 1:
The patent applies parameter changes by systematically varying the substituents on the triazine ring to optimize electron mobility and energy level alignment. By changing the heterocyclic groups and their positions, the invention achieves better charge transport parameters and reduced energy barriers, resulting in lower driving voltage and higher device efficiency.
Solution Approach 2:
The patent applies segmentation by dividing the electron transport function into distinct molecular components - the triazine core provides the fundamental electron transport pathway while the heterocyclic substituents (pyrazyl, pyrimidyl, quinoxalyl, etc.) provide specialized functions such as energy level tuning and molecular packing optimization, achieving synergistic performance.
Data Source
AI summary
A 1,3,5-triazine derivative represented by the formula (1):wherein R1, R2 and R3 each independently represent a hydrogen atom or a methyl group; X represents a carbon atom or a nitrogen atom; Ar1 represents a substituted or unsubstituted aromatic hydrocarbon group; Ar2 represents an C1-4 alkyl-substituted or unsubstituted aromatic 6-membered heterocyclic group having one or two nitrogen atoms, which may be a condensed ring compound. An organic electroluminescent device comprising the 1,3,5-triazine derivative exhibits low power consumption and long lifetime.