Organic Electroluminescent Host Material Composite for Efficiency and Lifetime
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Solution Overview
Problem
Existing organic electroluminescent devices, particularly those using triplet emission (phosphorescence), face challenges in efficiency, operating voltage, and service life, despite advancements in host and matrix materials.
Innovation Solution
A combination of specific electron-transporting and hole-transporting host materials, represented by compounds of formulas (1) and (2), is used in the light-emitting layer of organic electroluminescent devices, enhancing device properties such as service life, efficiency, and operating voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If phosphorescent emitters are used in organic electroluminescent devices, then energy efficiency is improved, but service life and operating voltage performance deteriorate
Solution Approach 1:
The patent employs a composite host material system consisting of two distinct components: a first host material (compounds of formula (1)) that provides electron transport and triplet energy, and a second host material (compounds of formula (2)) that provides hole transport. This composite approach allows the device to simultaneously achieve high energy efficiency through phosphorescent emission while improving service life by distributing the operational stress and enhancing stability through the synergistic interaction of the two host materials, thereby resolving the contradiction between efficiency and reliability.
2Loss of energy
If phosphorescent emitters are used in organic electroluminescent devices, then energy efficiency is improved, but operating voltage performance deteriorates
Solution Approach 1:
The patent employs a composite host material system consisting of two distinct components: a first host material (compounds of formula (1)) that provides electron transport and triplet energy, and a second host material (compounds of formula (2)) that provides hole transport. This composite approach allows the device to simultaneously achieve high energy efficiency through phosphorescent emission while improving service life by distributing the operational stress and enhancing stability through the synergistic interaction of the two host materials, thereby resolving the contradiction between efficiency and reliability.
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 host material combinations in the light-emitting layer improves the service life and maintains or enhances efficiency and operating voltage of organic electroluminescent devices, particularly when used with phosphorescent emitters at specific concentrations.
Implementation Method 1
Organic electroluminescent device comprising a light-emitting layer, wherein the light-emitting layer contains two host materials
Implementation Method 2
thereof, in particular with regard to lifetime, as well as to provide the corresponding electroluminescent device... especially in the presence of a light-emitting component in the emission layer, especially in combination with emitters of formula (5)
Data Source
AI summary
The present invention relates to an organic electroluminescent apparatus containing a mixture that comprises an electron-transporting host material and a hole-transporting host material, as well as to a formulation containing a mixture of the host materials and to a mixture containing the host materials. The electron-transporting host material corresponds to a compound of formula (1) from the class of compounds containing a bispirofluorenyl unit.