Multifunctional Compound OLED for Efficient Deep Blue Emission
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Solution Overview
Problem
Existing OLED technologies face challenges in achieving high quantum efficiency and realizing deep blue color due to inefficient energy transfer between singlets and triplets, wide emission spectra, and material stability issues.
Innovation Solution
An organic light emitting diode incorporating a multifunctional compound with an exciplex forming moiety and an emitting moiety, allowing for efficient energy transfer and reduced energy difference between singlets and triplets, facilitating deep blue color emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heavy metals such as Pt or Ir are used to increase spin-orbit coupling, then triplet emission efficiency is improved, but material cost increases and blue color stability deteriorates due to high singlet HOMO-LUMO gap energy
Solution Approach 1:
The patent introduces an exciplex forming compound as an intermediary substance that mediates energy transfer between the electron donor and acceptor molecules. This exciplex forming compound enables efficient triplet energy transfer to the dopant without requiring expensive heavy metals, thus improving triplet emission efficiency while maintaining material stability and blue color characteristics.
2Productivity
If TADF method is used to increase internal quantum efficiency, then energy transfer efficiency is improved, but emission spectrum FWHM widens making deep blue color realization difficult
Solution Approach 1:
The patent applies local quality by creating a specific exciplex structure between the electron donor and acceptor molecules, where the energy transfer characteristics are locally optimized. This localized exciplex formation enables efficient triplet energy transfer while maintaining a narrow emission spectrum FWHM, thus achieving both high internal quantum efficiency and deep blue color realization.
3Productivity
If exciplex is formed between electron donor and acceptor molecules to reduce energy difference between singlet and triplet, then light emission efficiency is improved, but emission spectrum FWHM remains very wide preventing deep blue color
Solution Approach 1:
The patent changes the energy parameters by carefully selecting the electron donor and acceptor molecules with specific HOMO-LUMO gap energies. By optimizing the energy level alignment between these molecules, the patent achieves efficient triplet energy transfer while maintaining a narrow emission spectrum FWHM, thus realizing both high light emission efficiency and deep blue color.
4Shape
If dopant is added to obtain deep blue color from exciplex, then color purity is improved, but quantum efficiency decreases due to inefficient energy transfer from exciplex to dopant
Solution Approach 1:
The exciplex forming compound acts as an intermediary that facilitates efficient energy transfer from the exciplex to the dopant. This intermediary mechanism ensures that the triplet energy from the exciplex is effectively transferred to the dopant, achieving both deep blue color purity and high quantum efficiency simultaneously.
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 organic light emitting diode achieves high quantum efficiency and deep blue color emission by effectively transferring exciplex energy to the emitting moiety, minimizing energy loss and maintaining material stability.
Implementation Method 1
the exciplex forming moiety forms an exciplex with the exciplex forming compound
Implementation Method 2
the emitting moiety emits light by receiving excited energy of the exciplex, which is transferred to the emitting moiety
Implementation Method 3
Organic Light Emitting Diode (OLED) is a device that emits light by forming excitons by combining holes injected from the anode and electrons injected from the cathode in the emission layer
Implementation Method 4
the multifunctional compound includes an exciplex forming moiety and an emitting moiety; the exciplex forming moiety forms an exciplex with the exciplex forming compound; and the emitting moiety emits light by receiving excited energy of the exciplex, which is transferred to the emitting moiety
Data Source
AI summary
The present disclosure relates to an organic light emitting diode including an emission layer including a multifunctional compound.