OLED Matrix Compounds Optimizing Triplet Energy and Charge Transport
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Solution Overview
Problem
Current organic electroluminescent devices (OLEDs) face challenges in efficiency, operating voltage, and lifetime, particularly in triplet emission phosphorescent OLEDs, where the performance of phosphorescent emitters is influenced by the properties of other materials like matrix materials.
Innovation Solution
Development of specific compounds with the formula (1) that can be used as matrix materials, electron-transport materials, hole-blocking materials, hole-transport materials, electron-blocking materials, or fluorescent emitters, which enhance the performance of OLEDs by providing long lifetime, high efficiency, and low operating voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If phosphorescent organometallic complexes are used as emitting materials in OLEDs, then triplet emission is achieved, but efficiency, operating voltage, and lifetime need improvement
Solution Approach 1:
The patent modifies the molecular structure of matrix materials by introducing specific functional groups (formula 2 with Z1, Z2, Z3 being O, S, or N-Ar) to optimize the triplet energy level and other parameters, thereby improving both efficiency and lifetime of phosphorescent OLEDs
Solution Approach 2:
The invention creates composite material systems combining phosphorescent emitters with specifically designed matrix materials having complementary properties, where the matrix material's triplet energy is optimized to be higher than the emitter's triplet energy to prevent energy back-transfer and improve device performance
2Productivity
If conventional matrix materials are used in phosphorescent OLEDs, then device operation is achieved, but efficiency and lifetime are limited
Solution Approach 1:
The patent introduces localized functional groups (formula 2) at specific positions in the matrix material molecule to create local regions with optimized electronic properties, particularly triplet energy levels, that enhance the overall device efficiency and stability without requiring complete molecular redesign
3Loss of energy
If OLEDs with improved efficiency are developed, then energy conversion is enhanced, but operating voltage may increase
Solution Approach 1:
The matrix materials of formula (1) are designed to perform multiple functions simultaneously: they provide the necessary triplet energy level for phosphorescent emission, facilitate charge transport, and maintain appropriate HOMO/LUMO levels for efficient charge injection, thereby achieving high efficiency without compromising voltage characteristics
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 these compounds results in OLEDs with improved efficiency, extended lifetime, and reduced operating voltage, making them suitable for various applications in organic electroluminescent devices.
Implementation Method 1
electron-transport materials
Implementation Method 2
hole-blocking materials
Implementation Method 3
hole-transport materials
Implementation Method 4
electron-blocking materials
Implementation Method 5
fluorescent emitters
Data Source
AI summary
The invention relates to compounds of formula (1) which are suitable for use in electronic devices, and to electronic devices, in particular organic electroluminescent devices, containing said compounds. X is, identically or differently in each occurrence, CR or N, or two adjacent X stand for a group of the following formula (2), wherein the dashed bonds mark the bonding of said group in formula (1), with the stipulation that the compound of formula (1) contains one or two groups of formula (2); X1 is, identically or differently in each occurrence, CR or N; Y is, identically or differently in each occurrence, CR or N; Z1, Z2, Z3 are, identically or differently in each occurrence, O, S, N—Ar or CR2.