Heterocyclic Compound Dopant for OLED Efficiency and Voltage
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Solution Overview
Problem
Current organic electroluminescence devices face challenges in achieving high efficiency and low driving voltage due to limitations in the materials used for the light emitting layer, particularly in thermally activated delayed fluorescence applications.
Innovation Solution
Incorporating a heterocyclic compound represented by Formula 1, which includes electron-donating and electron-accepting groups, as a dopant in the light emitting layer to enhance efficiency and reduce driving voltage, utilizing a host material and other thermally activated delayed fluorescence dopants to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional materials are used in the light emitting layer, then the device structure is simple, but the efficiency is low and driving voltage is high
Solution Approach 1:
The patent employs composite material strategy by combining the heterocyclic compound (containing both electron-donating and electron-accepting groups) with a host material to form a dopant system. This composite approach enables simultaneous achievement of high efficiency and low driving voltage through synergistic interactions between the dopant and host materials, while maintaining manageable device structure.
Solution Approach 2:
The patent utilizes parameter changes by modifying the molecular structure of the light emitting materials - specifically incorporating heterocyclic compounds with electron-donating and electron-accepting groups. This structural parameter modification enables the material to achieve superior electroluminescence properties including high efficiency and low driving voltage characteristics.
2Productivity
If conventional dopants are used, then the device is easy to manufacture, but the efficiency and performance are limited
Solution Approach 1:
The patent applies parameter changes by designing heterocyclic compounds with specific structural features (electron-donating and electron-accepting groups) that enhance light emitting efficiency. The compound formula and structural parameters are optimized to achieve superior performance while maintaining compatibility with conventional manufacturing processes.
3Power
If simple light emitting materials are used, then the device structure is straightforward, but the driving voltage remains high
Solution Approach 1:
The patent uses composite materials approach by formulating a dopant system consisting of heterocyclic compounds combined with host materials. This composite structure enables effective charge transport and recombination processes that reduce driving voltage requirements, while the overall device architecture remains relatively simple and straightforward to implement.
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 use of the heterocyclic compound results in improved efficiency and lower driving voltage for organic electroluminescence devices, outperforming comparative examples by utilizing two electron-donating groups and hexagonal rings for enhanced performance.
Implementation Method 1
the light emitting layer includes a heterocyclic compound represented by Formula 1... the dopant may be a thermally activated delayed fluorescence dopant
Data Source
AI summary
An organic electroluminescence device includes a first electrode, a hole transport region disposed on the first electrode, a light emitting layer disposed on the hole transport region, an electron transport region disposed on the light emitting layer, and a second electrode disposed on the electron transport region. The light emitting layer includes a heterocyclic compound represented by Formula 1 below. In Formula 1, D1 and D2 are each independently represented by Formula 2 below, and A is represented by any one of Formulas 3-1 to 3-3 below.D1-A-D2 Formula 1