Organic Light-Emitting Layer Composition for Low-Voltage Color Purity
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Solution Overview
Problem
Existing organic electric elements face issues with high driving voltage, reduced efficiency, and shortened lifespan due to intermolecular interactions and deterioration in color purity, particularly in large display devices with limited power sources.
Innovation Solution
Incorporation of a specific compound mixture in the light-emitting layer, represented by Formulas 1 and 2, to optimize energy levels and charge balance, thereby lowering driving voltage and enhancing luminous efficiency and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single light emitting material is used, then the device structure is simple, but the maximum luminescence wavelength shifts to longer wavelength and color purity deteriorates
Solution Approach 1:
The patent uses a host/dopant composite material system where a host material and dopant material are combined in the light emitting layer. The dopant (e.g., Ir(ppy)3, PtOEP) has a smaller energy band gap than the host, enabling efficient energy transfer while maintaining color purity and luminous efficiency, thus resolving the contradiction between structural simplicity and color quality
2Productivity
If efficiency is increased, then driving voltage is lowered, but Joule heating increases causing organic material crystallization
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: energy levels of host and dopant materials, Ti values, inherent material properties (mobility, interfacial properties), and layer structure. This comprehensive parameter optimization achieves high efficiency while controlling Joule heating and preventing crystallization, resolving the contradiction between efficiency and temperature control
3Duration of action of stationary object
If driving voltage is lowered to reduce Joule heating, then lifespan increases, but efficiency may be compromised
Solution Approach 1:
The patent achieves optimal balance by carefully selecting and optimizing energy levels, Ti values, and material properties of the host/dopant system. This allows simultaneous achievement of high efficiency and extended lifespan through coordinated parameter optimization rather than sacrificing one for the other
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 compound mixture improves luminous efficiency and extends the lifespan of the organic electric element by optimizing energy levels and charge balance, reducing driving voltage and minimizing crystallization from Joule heating.
Implementation Method 1
excitons generated in the light emitting layer are transported to the dopant, thus emitting light with high efficiency
Implementation Method 2
crystallization of an organic material due to Joule heating generated during operation
Data Source
AI summary
An organic electric element according to an embodiment of the present disclosure includes a first electrode, a second electrode, and an organic material layer formed between the first electrode and the second electrode. The organic material layer includes compounds represented by Formula 1 and Formula 2 of the present invention, thereby the driving voltage the organic electric element can be lowered, and the luminous efficiency and the life time of the organic electric element can be improved.