Electroluminescent Device with Metal Oxide-Organic Polymer Composite ETL
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Solution Overview
Problem
Existing electroluminescent devices face challenges in achieving high luminous efficiency and lifespan due to issues with leakage current and electron transport properties.
Innovation Solution
An electroluminescent device is designed with a metal oxide particle-organic polymer composite electron transport layer, where the organic polymer is present in a specific weight percentage and has a specific molecular weight, combined with quantum dots, to enhance electron transport and hole blocking capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional electron transport layers are used, then device structure is simple, but leakage current increases and luminous efficiency decreases
Solution Approach 1:
The electron transport layer uses a composite material consisting of metal oxide particles dispersed in an organic polymer matrix. This composite structure combines the high electron mobility of metal oxides with the film-forming capability and tunability of organic polymers, achieving low leakage current and high luminous efficiency while maintaining reasonable device complexity
Solution Approach 2:
The patent optimizes the weight percentage of organic polymer in the electron transport layer (7-30 wt%) and controls the particle size of metal oxide particles (0.1-10 nm). These parameter changes enable precise control over electron transport properties and leakage current, improving luminous efficiency without excessive complexity
2Speed
If electron transport layer is optimized for electron mobility, then electron transport improves, but hole blocking performance may deteriorate
Solution Approach 1:
The electron transport layer is designed with specific local properties: metal oxide particles provide high electron mobility in specific regions, while the organic polymer matrix provides hole blocking capability. The composite structure creates local quality differentiation that simultaneously achieves both electron transport and hole blocking functions
Solution Approach 2:
By adjusting the weight percentage of organic polymer (7-30 wt%) and metal oxide particle size (0.1-10 nm), the patent optimizes the balance between electron transport speed and hole blocking reliability. The specific parameter ranges ensure both functions are satisfied 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 solution improves luminous efficiency and lifespan by minimizing leakage current and optimizing electron transport, resulting in enhanced performance and durability of the electroluminescent device.
Implementation Method 1
The plurality of metal oxide particles may be dispersed in the organic polymer
Implementation Method 2
The organic polymer is adsorbed on at least a portion of the plurality of metal oxide particles
Implementation Method 3
an electroluminescent device includes a first electrode; a hole transport layer disposed on the first electrode; an emission layer disposed on the hole transport layer and including a plurality of light emitting particles
Data Source
AI summary
An electroluminescent device comprising a first electrode; a hole transport layer disposed on the first electrode; an emission layer disposed on the hole transport layer and comprising a plurality of light emitting particles; an electron transport layer disposed on the emission layer and comprising a metal oxide particle-organic polymer composite comprising a plurality of metal oxide particles and an organic polymer; and a second electrode disposed on the electron transport layer, wherein the organic polymer is present in the metal oxide particle-organic polymer composition in an amount of about 7 weight percent to about 30 weight percent based on a total weight of the electron transport layer.