OLED Emitting Layer Host Compound for Quenching-Resistant Efficiency
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Solution Overview
Problem
Existing organic light emitting diodes (OLEDs) face limitations in lifespan and emitting efficiency due to the concentration quenching problem of dopants in the emitting material layer (EML) and the use of conventional hosts like CBP, which restricts the energy level of triplet state.
Innovation Solution
An organic compound with a dibenzofuran core and specific substituents is used as an n-type host in the EML, enhancing the energy level of triplet state and incorporating a dual-dopant system of delayed fluorescent and fluorescent dopants to improve efficiency and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional host like CBP is used in the emitting material layer, then the device can operate, but the lifespan and emitting efficiency are limited due to concentration quenching of dopants and insufficient triplet state energy level
Solution Approach 1:
The patent changes the energy level parameter of the host material by introducing a dibenzofuran core structure with specific substituents (Formula 2). This structural modification increases the triplet state energy level (ET) to 2.92 eV, which resolves the concentration quenching problem and improves both lifespan and emitting efficiency simultaneously
Solution Approach 2:
The patent creates a composite emitting material layer combining the newly synthesized host compound (Formula 1 or Formula 3) with dopant materials. This composite structure enables energy transfer from host to dopant while preventing concentration quenching, thereby improving both reliability and energy efficiency
2Loss of energy
If the energy level of triplet state is increased to prevent concentration quenching, then emitting efficiency improves, but the device complexity increases due to specific molecular structure requirements
Solution Approach 1:
The patent systematically modifies molecular parameters by varying substituents (X1, X2, X3, R1-R6) on the dibenzofuran core to optimize triplet state energy level. The general Formula 1 and Formula 3 structures provide a framework that balances high ET (2.92 eV) with synthesizability, avoiding overly complex structures while achieving the required energy level
Solution Approach 2:
The molecular structure is segmented into a core dibenzofuran unit (Formula 2) and variable substituent groups (R1-R6). This segmentation allows independent optimization of the core structure for high triplet state energy while keeping substituent modifications relatively simple and systematic
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 organic compound with a high triplet state energy level and n-type property improves emitting efficiency and lifespan by optimizing the recombination zone, achieving higher quantum efficiency and color purity in OLED devices.
Implementation Method 1
the organic compound having a high energy level of triplet state... improves emitting efficiency... by transferring energy to the dopant
Implementation Method 2
The organic light emitting diode emits light by injecting electrons from a cathode... combining the electrons with the holes, generating an exciton, and transforming the exciton from an excited state to a ground state
Data Source
AI summary
The present disclosure provides an organic compound having the following formula and an organic light emitting diode (OLED) and an OLED device including the organic compound.