Quantum Dot Light Emitting Device Electron Auxiliary Layer
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Solution Overview
Problem
Existing light emitting devices using quantum dots face challenges in improving performance due to differences in light emitting principles compared to traditional light emitting materials.
Innovation Solution
A light emitting device is developed with a light emitting layer comprising quantum dots and an electron auxiliary layer containing metal oxide nanoparticles and a nitrogen-containing metal complex, which enhances electron transport and injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are used as light emitting body in electroluminescent device, then light emitting characteristics can be controlled by particle size, but device performance is difficult to improve due to different light emitting principle from traditional materials
Solution Approach 1:
The patent introduces an electron auxiliary layer as an intermediary component between the electron transport layer and quantum dot light emitting layer. This layer mediates the interaction between electrons and quantum dots, facilitating efficient electron injection and transport while addressing the compatibility issues between different light emitting mechanisms. The electron auxiliary layer acts as a buffer that adapts the electron supply from traditional materials to the quantum dot light emitting process.
Solution Approach 2:
The electron auxiliary layer is constructed as a composite material system combining metal oxide nanoparticles (such as zinc oxide) with nitrogen-containing metal complexes. This composite structure leverages the advantages of both components: metal oxide nanoparticles provide electron transport pathways and surface area, while nitrogen-containing complexes enhance electron injection efficiency. The composite material approach resolves the performance limitations by integrating multiple functional properties in a single layer.
2Adaptability or versatility
If traditional light emitting materials are used, then established light emitting principles apply, but quantum dots cannot achieve optimal performance with conventional structures
Solution Approach 1:
The patent modifies the structural and compositional parameters of the device by inserting the electron auxiliary layer with specific characteristics (metal oxide nanoparticles with nitrogen-containing complexes). This parameter change enables the device to accommodate quantum dots as the light emitting material, transforming the device architecture to be compatible with nanoscale semiconductor particles while maintaining or enhancing overall 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 device achieves improved light emitting characteristics, including a maximum external quantum efficiency of greater than or equal to 10% and a maximum luminance of greater than or equal to 35,000 cd/m2, while extending the device's lifespan.
Implementation Method 1
an electron auxiliary layer disposed on the light emitting layer, the electron auxiliary layer configured to transport electrons, inject electrons into the light emitting layer
Implementation Method 2
an electron auxiliary layer disposed on the light emitting layer, the electron auxiliary layer configured to transport electrons, inject electrons into the light emitting layer
Implementation Method 3
semiconductor nanocrystals also known as quantum dots may be supplied with photoenergy or electrical energy and may emit light in a wavelength corresponding to sizes of the quantum dots
Implementation Method 4
Physical characteristics (e.g., bandgap energies, melting points, etc.) of nanoparticles that are intrinsic characteristics may be controlled by changing the particle sizes of the of nanoparticles, unlike bulk materials
Implementation Method 5
the metal oxide nanoparticles include zinc and optionally a dopant metal, wherein the dopant metal includes an alkali metal, an alkaline-earth metal, a Group IIIB metal, a Group IVB metal, a Group IIIA metal, cobalt, tungsten, or a combination thereof
Data Source
AI summary
A light emitting device and a production method thereof. The light emitting device includes a light emitting layer including a plurality of quantum dots, and an electron auxiliary layer disposed on the light emitting layer, the electron auxiliary layer configured to transport electrons, inject electrons into the light emitting layer, or a combination thereof, wherein the electron auxiliary layer includes a plurality of metal oxide nanoparticles and a nitrogen-containing metal complex. The metal oxide nanoparticles include zinc and optionally a dopant metal, the dopant metal includes Mg, Co, Ga, Ca, Zr, W, Li, Ti, Y, Al, Co, or a combination thereof and a mole ratio of nitrogen to zinc in the electron auxiliary layer is greater than or equal to about 0.001:1.