OLED Emitting Layer Host Composition for Stable Co-Evaporation
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Solution Overview
Problem
There is a continuous need for developing new materials for organic light emitting devices to improve efficiency and stability.
Innovation Solution
An organic light emitting device incorporating a light emitting layer composed of a compound represented by Chemical Formula 1 and a compound represented by Chemical Formula 2, which includes boron-containing and anthracene host materials, facilitating a stable co-evaporation mixture and enhancing electron transfer and hole balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If new materials are developed for the organic light emitting device, then efficiency and stability are improved, but device complexity increases
Solution Approach 1:
The patent employs composite materials by combining a boron-containing host material (Formula 1) with an anthracene host material (Formula 2) in the light emitting layer. This composite approach achieves improved efficiency and stability through synergistic effects: the boron-containing material provides high triplet energy level (≥2.10 eV) for efficient phosphorescent emission, while the anthracene material contributes to stable co-evaporation and balanced charge transport. The combination resolves the contradiction by delivering enhanced reliability through material synergy rather than single-material optimization, thereby managing complexity through purposeful multi-material integration.
2Productivity
If a multi-layered structure with different materials is used, then efficiency and stability are improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the functions of multiple materials into a single light emitting layer that achieves both high efficiency and stable manufacturing. By combining the boron-containing host material (providing phosphorescent emission capability with T≥2.10 eV) and the anthracene host material (providing stable co-evaporation characteristics) in a unified layer structure, the invention attains high luminescent efficiency while simplifying the manufacturing process. The merged structure enables stable co-evaporation deposition, reducing the need for separate layer fabrication steps and thereby improving ease of manufacture without sacrificing productivity.
3Power
If the light emitting layer uses compounds with specific structures (Formulas 1 and 2), then driving voltage is reduced and efficiency is improved, but material selection complexity increases
Solution Approach 1:
The patent applies parameter changes by establishing specific structural parameters for the host materials that directly influence device performance. Formula (1) specifies a boron-containing structure with defined substituents (R1-R6, L1-L6) and Formula (2) defines an anthracene core with specific substituent positions. These parameterized structures ensure the boron-containing material achieves the required triplet energy level (T≥2.10 eV) for low driving voltage operation, while the anthracene structure provides stable co-evaporation. The parameter changes approach reduces material selection complexity by providing clear structural guidelines that guarantee both low driving voltage and manufacturing stability.
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 device achieves low driving voltage, high efficiency, and extended service life through the use of these compounds in the light emitting layer.
Implementation Method 1
An organic light emission phenomenon generally refers to a phenomenon converting electrical energy to light energy using an organic material
Implementation Method 2
facilitating a stable co-evaporation mixture
Data Source
AI summary
Disclosed is an organic light emitting device including: an anode; a cathode; and a light emitting layer provided between the anode and the cathode, in which the light emitting layer includes a compound represented by Chemical Formula 1 and a compound represented by Chemical Formula 2.