Phenanthrene OLED Host Compounds for Low-Voltage Long-Life Emission
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Solution Overview
Problem
Existing organic electroluminescent devices face challenges in achieving low driving voltage, high efficiency, and improved operational lifespan, particularly in middle or large-sized panels, with compounds like those in Japanese patent application laid-open No. 2001-23777 showing excellent color purity but needing improvements in driving voltage, current efficiency, and lifespan.
Innovation Solution
The use of a phenanthrene compound with a 5-membered heteroaryl condensed with a side benzene ring as a host or in the electron buffer layer, represented by specific organic electroluminescent compounds with defined structural elements, enhances the efficiency and lifespan of the devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a phenanthrene compound with a 5-membered heteroaryl condensed with the middle benzene ring is used as a host material, then color purity is improved, but driving voltage and current efficiency deteriorate
Solution Approach 1:
The patent modifies the chemical structure parameters of the host material by changing the position of the 5-membered heteroaryl condensation from the middle benzene ring to a side benzene ring of the phenanthrene backbone. This structural parameter change simultaneously improves color purity while reducing driving voltage and enhancing current efficiency, resolving the technical contradiction.
2Measurement precision
If a phenanthrene compound with a 5-membered heteroaryl condensed with the middle benzene ring is used as a host material, then color purity is improved, but operational lifespan deteriorates
Solution Approach 1:
The patent changes the structural parameter of the host material by relocating the 5-membered heteroaryl condensation to a side benzene ring instead of the middle benzene ring. This modification extends the operational lifespan of the OLED while maintaining excellent color purity, thereby resolving the contradiction between color purity and device longevity.
3Ease of manufacture
If conventional host materials are used in middle or large-sized OLED panels, then manufacturing is simplified, but efficiency and lifespan are insufficient
Solution Approach 1:
The patent employs a phenanthrene derivative with a 5-membered heteroaryl condensed to a side benzene ring, which maintains compatibility with conventional vacuum deposition manufacturing processes while significantly improving current efficiency and operational lifespan in middle and large-sized OLED panels, thus resolving the contradiction between ease of manufacture and performance.
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 proposed compounds significantly improve the efficiency and lifespan of organic electroluminescent devices, maintaining high efficiency at high luminance and extending the operational lifespan, aligning with current demands for high-resolution displays.
Implementation Method 1
An organic EL device (OLED) is a device changing electrical energy to light by applying electricity to an organic electroluminescent material
Implementation Method 2
By this energy, organic luminescent compounds reach an excited state, and light emission occurs by emitting light from energy due to the excited state of the organic luminescent compounds returning to a ground state
Data Source
AI summary
The present disclosure relates to organic electroluminescent compounds and an organic electroluminescent device comprising the same. The organic electroluminescent compound according to the present disclosure may be comprised in a light-emitting layer or an electron buffer layer, and is effective to produce an organic electroluminescent device having low driving voltage, excellent current and power efficiencies, and significantly improved operative lifespan.