Organic Compound Emissive Layer for OLED Efficiency and Lifespan
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Solution Overview
Problem
Existing organic light emitting diodes (OLEDs) face challenges in achieving improved luminous efficiency and luminous lifespan, with fluorescent materials exhibiting low efficiency due to the use of only singlet excitons and phosphorescent materials having short lifespans due to metal complexes.
Innovation Solution
Development of organic compounds with specific structures that can be applied in OLEDs to enhance driving voltage, luminous efficiency, and luminous lifespan, including the use of organic compounds with phenyl and naphthyl groups in the emissive layer to improve exciton blocking and charge transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If phosphorescent materials are used to improve luminous efficiency, then luminous efficiency is improved, but luminous lifespan becomes too short for commercial use
Solution Approach 1:
The patent changes the chemical composition parameters of the emissive layer by using specific host-guest combinations (mCP host with TCTA and Alq3 guests) to achieve high luminous efficiency without relying on phosphorescent metal complexes, thereby avoiding the short lifespan problem while maintaining efficiency
Solution Approach 2:
The patent replaces the short-living phosphorescent metal complex materials with organic compounds that have longer operational stability, effectively substituting a material with a fundamental flaw (short lifespan) with a more durable alternative that achieves similar or better performance
2Duration of action of stationary object
If fluorescent materials are used to extend luminous lifespan, then luminous lifespan is improved, but luminous efficiency becomes low due to use of only singlet excitons
Solution Approach 1:
The patent creates a composite emissive layer system combining multiple organic compounds (mCP host, TCTA guest, Alq3 guest) that work synergistically to achieve both long lifespan and high efficiency by utilizing both singlet and triplet excitons through triplet-triplet energy transfer mechanisms
Solution Approach 2:
The patent introduces TCTA as an intermediary substance that facilitates energy transfer between the host and Alq3, enabling efficient utilization of triplet excitons and improving overall luminous efficiency while maintaining the stability of fluorescent materials
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 compounds improve the luminous efficiency and lifespan of OLEDs by optimizing the energy levels and charge transport properties, leading to reduced driving voltage and enhanced performance.
Implementation Method 1
organic compounds with phenyl and naphthyl groups in the emissive layer to improve exciton blocking and charge transport
Implementation Method 2
organic compounds with beneficial luminous properties, and organic light emitting diodes (OLEDs)
Data Source
AI summary
The present disclosure relates to an organic compound, an organic light emitting diode (OLED) and an organic light emitting device having thereof. In particular, an organic compound having the following structure of Chemical Formula 1 is provided. Luminous lifespan of an organic light emitting diode (OLED) and an organic light emitting device containing the OLED (e.g., a display device or a lighting device) can be improved by applying the organic compound in an emissive layer in the OLED.