Light-Emitting Element Excited Complex for Blue Phosphorescence
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Solution Overview
Problem
Current light-emitting elements with phosphorescent compounds face challenges in achieving high light emission efficiency and low power consumption, particularly for blue light emission, due to difficulties in developing stable compounds with high triplet excitation energy levels, and there is a need to efficiently convert triplet excited states into light emission.
Innovation Solution
A light-emitting element is designed with a high molecular material and a guest material that form an excited complex, where the high molecular material includes chains with specific skeletons for hole and electron transport, and the guest material converts triplet excitation energy into light emission, optimizing the energy difference between singlet and triplet excited states to enhance light emission efficiency and reduce driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If phosphorescent compounds are used to convert triplet excited states into light emission, then light emission efficiency is improved, but it becomes difficult to achieve stable compounds with high triplet excitation energy levels particularly for blue light emission
Solution Approach 1:
The patent introduces a host material as an intermediary that absorbs electrical energy and generates triplet excited states, which then transfer energy to the phosphorescent guest material. This mediator approach allows the host to handle the high energy requirements while the guest handles the light emission, resolving the contradiction between efficiency and stability.
Solution Approach 2:
The patent optimizes the energy level parameters of both host and guest materials, specifically designing the triplet energy level of the host to be higher than that of the guest, enabling efficient energy transfer while maintaining compound stability. This parameter optimization allows blue light emission with high efficiency and stability.
2Productivity
If the energy difference between singlet and triplet excited states is large, then triplet excited states can be converted into light emission, but the driving voltage increases and element characteristics are affected
Solution Approach 1:
The patent carefully controls the energy level parameters, specifically designing the singlet-triplet energy difference to be optimized for efficient phosphorescence while keeping the driving voltage within acceptable ranges. The host-guest energy level matching minimizes energy loss and reduces driving voltage requirements.
3Ease of manufacture
If high molecular compounds are used to form thin films with excellent uniformity, then manufacturing ease is improved, but the ability to efficiently convert triplet excited states into light emission is reduced
Solution Approach 1:
The patent creates a composite light-emitting layer combining host high molecular compound and guest phosphorescent material. The host provides excellent film-forming properties and thermal stability, while the guest provides efficient phosphorescence. This composite approach resolves the contradiction between manufacturability and emission efficiency.
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 solution results in a light-emitting element with high light emission efficiency and low power consumption, efficiently converting triplet excited states into singlet excited states for effective light emission, thereby improving the overall performance of the light-emitting device.
Implementation Method 1
Light emission from the triplet excited state is referred to as phosphorescence
Implementation Method 2
a light-emitting element in which a triplet exciton is converted into a singlet exciton and light can be emitted from a compound containing the singlet exciton
Implementation Method 3
The first skeleton has a function of transferring holes, and the second skeleton has a function of transferring electrons
Implementation Method 4
light-emitting elements using electroluminescence (EL)
Data Source
AI summary
A light-emitting element containing a light-emitting material with high light emission efficiency is provided. The light-emitting element includes a high molecular material and a guest material. The high molecular material includes at least a first high molecular chain and a second high molecular chain. The guest material has a function of exhibiting fluorescence or converting triplet excitation energy into light emission. The first high molecular chain and the second high molecular chain each include a first skeleton, a second skeleton, and a third skeleton, and the first skeleton and the second skeleton are bonded to each other through the third skeleton. The first high molecular chain and the second high molecular chain have a function of forming an excited complex.