Organic Light Emitting Element Triphenylene Host Material
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Solution Overview
Problem
Phosphorescent organic light emitting elements face inefficiencies due to greater hole mobility than electron mobility in the light emitting layer, leading to reduced light emission as excitons are distributed over a wide area, affecting both efficiency and lifespan.
Innovation Solution
An organic light emitting element is designed with an organic material layer incorporating a specific compound represented by chemical formula 1, which enhances the host material's triplet level and stability, improving light emission efficiency and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If phosphorescent organic light emitting element uses conventional host material, then material stability is maintained, but light emission efficiency is reduced due to exciton distribution over wide area
Solution Approach 1:
The patent changes the chemical structure parameters of the host material by introducing a specific compound with formula (1) containing triphenylene or spirobifluorene core structures with particular substituent patterns. This structural parameter change increases triplet energy levels to 2.5 eV or higher, which confines excitons more effectively and improves light emission efficiency while maintaining material stability through the rigid aromatic core structure.
Solution Approach 2:
The patent employs a composite host material system where the new compound (formula 1) is combined with guest dopant materials having appropriate energy levels. This composite approach allows the host to provide structural stability and triplet energy confinement, while the guest material contributes to efficient light emission, resolving the contradiction between stability and efficiency.
2Use of energy by moving object
If driving voltage is increased to improve efficiency, then light emission efficiency increases, but Joule heating increases causing crystallization and reduced lifespan
Solution Approach 1:
The patent changes the electrical transport parameters by selecting host and guest materials with appropriate LUMO energy levels and electron mobility characteristics. The compound of formula (1) provides optimized electron transport properties that reduce resistive heating at operating voltages, thereby improving efficiency without excessive Joule heating that would cause crystallization.
Solution Approach 2:
The patent converts the potential harm of Joule heating by designing materials with high thermal stability and appropriate phase transition temperatures. The rigid aromatic structures in formula (1) resist crystallization even at elevated temperatures, effectively converting the thermal stress into a beneficial demonstration of material robustness rather than degradation.
3Use of energy by moving object
If host material triplet level is increased to improve efficiency, then exciton confinement improves, but material stability may be compromised
Solution Approach 1:
The patent carefully adjusts the triplet energy level parameter to be 2.5 eV or higher by modifying the molecular structure of formula (1), while simultaneously ensuring material stability through the use of robust aromatic core structures (triphenylene, spirobifluorene) that resist degradation. This parameter optimization achieves both high exciton confinement and material 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 proposed organic light emitting element achieves higher efficiency and longer lifespan by effectively distributing excitons and reducing Joule heating, thereby enhancing light emission properties.
Implementation Method 1
organic light emission refers to a phenomenon in which electric energy is converted into light energy by an organic material
Implementation Method 2
the crystallization of the organic material by the Joule heating during driving is reduced
Data Source
AI summary
Embodiments of the disclosure relate to an organic light emitting element. Specifically, there may be provided an organic light emitting element having high efficiency or long lifespan by including a first electrode, a second electrode, and an organic material layer positioned therebetween wherein the organic material layer includes a specific compound.