Anthracene-Pyrene Emitter for Low-Voltage OLED Efficiency
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Solution Overview
Problem
Current organic electroluminescence devices require high driving voltage, exhibit low luminescence intensity, and have short lifetimes, limiting their practical use for lighting and display applications.
Innovation Solution
Incorporating an anthracene derivative and a pyrene derivative in the emitting layer of the organic electroluminescence device, with specific structural formulations, to enhance luminous efficiency and extend the device's lifespan while reducing the driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a typical organic EL device structure is used, then the device can be manufactured with conventional materials, but the driving voltage is high and luminous efficiency is low
Solution Approach 1:
The patent uses a composite material system consisting of an anthracene derivative (compound 1) as host material and a pyrene derivative (compound 21) as dopant material. This composite organic compound system enables simultaneous achievement of low driving voltage and high luminous efficiency by combining the electrical transport properties of the anthracene host with the luminescent properties of the pyrene dopant.
2Duration of action of stationary object
If conventional organic EL materials are used, then the device structure is simple, but the lifetime is short due to serious property degradation
Solution Approach 1:
The patent changes the chemical parameters of the organic materials by selecting specific anthracene and pyrene derivatives with optimized molecular structures. The anthracene derivative (compound 1) with specific substituents and the pyrene derivative (compound 21) are chosen to have appropriate HOMO/LUMO energy levels, mobility, and stability parameters that collectively extend device lifetime while maintaining manufacturing feasibility.
3Illumination intensity
If the emission wavelength is shortened for blue emission, then color reproductivity is improved, but luminous efficiency and lifetime are insufficient
Solution Approach 1:
The patent uses the anthracene derivative (compound 1) as an intermediary host material that facilitates efficient energy transfer to the pyrene derivative (compound 21) dopant. This intermediary system enables blue emission with improved color purity while maintaining high luminous efficiency and extended lifetime through optimized energy transfer pathways and reduced non-radiative decay.
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 electroluminescence device achieves high luminous efficiency and extended lifetime while being driven at a low voltage, improving its suitability for electronic devices such as lighting and displays.
Implementation Method 1
When an electric field is applied between the electrodes, electrons are injected from a cathode while holes are injected from an anode. Recombination of the electrons with the holes in the emitting layer results in generation of an excited state. When the excited state returns to a ground state, energy is released as light.
Data Source
AI summary
An organic electroluminescence device according to the invention includes: a cathode; an anode; and an organic layer being interposed between the cathode and the anode, the organic layer comprising one or more layers comprising at least an emitting layer. The emitting layer contains: an anthracene derivative represented by a formula (1) below; and a pyrene derivative represented by a formula (21) below.