OLED Host Compounds with Aromatic Linkers for Red Phosphorescence
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Solution Overview
Problem
Current organic light-emitting diode (OLED) technologies face challenges in achieving efficient phosphorescent emission, particularly for red and near-infrared phosphorescent dopants, due to limitations in host materials that can effectively enhance the performance of these emitters.
Innovation Solution
The development of specific host compounds, such as those described in Formula I and Formula II, which are optimized to work with phosphorescent dopants, forming a direct or aromatic linker bond with these dopants, thereby improving the efficiency and performance of OLEDs, especially for orange or red phosphorescent emitters and near-IR emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional host materials are used with phosphorescent dopants, then the device structure is simple, but the electroluminescence efficiency is insufficient for red and near-infrared phosphorescent dopants
Solution Approach 1:
The patent modifies the host compound structure by introducing specific substituents (Formula III structures with aromatic linkers) to change the electronic and steric parameters of the host material, thereby optimizing its interaction with phosphorescent dopants and improving electroluminescence efficiency for red and near-infrared emissions
Solution Approach 2:
The patent creates composite emissive systems by combining specifically designed host compounds (Formula I and Formula II) with phosphorescent dopants, where the host compound acts as a matrix that enhances the phosphorescent emission properties through optimized molecular interactions and energy transfer mechanisms
2Power
If conventional host materials are used, then the manufacturing process is simple, but the power efficiency and luminance are limited
Solution Approach 1:
The patent optimizes the host compound structure by incorporating Formula III substituents with aromatic linkers, which modify the HOMO-LUMO energy levels, triplet energy, and molecular packing parameters to enhance power efficiency and luminance output in OLED devices
Solution Approach 2:
The host compound serves as an intermediary between the phosphorescent dopant and the electrical excitation, facilitating efficient energy transfer and enhancing the luminance output through optimized electronic coupling and energy level alignment
3Productivity
If conventional host materials are used, then the device is easy to manufacture, but the efficiency improvement for orange and red phosphorescent emitters is insufficient
Solution Approach 1:
The patent systematically varies the substituents in Formula I and Formula II to optimize the host-guest interaction parameters, thereby achieving significant efficiency improvements for orange and red phosphorescent emitters through enhanced triplet energy transfer and reduced non-radiative decay pathways
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
These host compounds significantly enhance the electroluminescence efficiency, power efficiency, and luminance of OLEDs, demonstrating improved performance compared to conventional hosts, with specific examples showing up to 135% better efficiency in certain devices.
Implementation Method 1
One application for phosphorescent emissive molecules is a full color display
Implementation Method 2
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
A compound selected from the group consisting ofwherein at least one of RG or at least one of RJ of Formula II includes a structure of Formula III, wherein the structure of Formula II forms a direct bond to Formula III through a carbon of one of X21 to X24, a carbon of one of X25 to X28, or RN, or optionally, the structure of Formula II is linked to Formula III through a carbon of one of X21 to X24, a carbon of one of X25 to X28, or RN, by an aromatic linkerAn organic light emitting diode/device (OLED) with an organic layer disposed between an anode and a cathode. The organic layer includes a compound of Formula I or Formula II. The OLED can be incorporated into one or more of a consumer product, an electronic component module, and/or a lighting panel.