Perovskite Light-Emitting Device Double-Sided Emission
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Solution Overview
Problem
Current transparent display technologies based on organic light-emitting diodes suffer from low color purity, requiring color filters to produce pure colors.
Innovation Solution
A perovskite light-emitting device is developed with a structure including a first injection layer of indium tin oxide, a light-emitting layer of halide perovskite, and a second injection layer of carbon nanotubes, which allows for double-sided light emission and improved electrical conductivity and stability, enhancing color purity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If organic materials are used in light-emitting diodes for transparent display, then the device can be made transparent, but the color purity is low
Solution Approach 1:
The patent uses halide perovskite as the light-emitting layer material, which is a composite material combining organic and inorganic components. This composite material achieves both high color purity (color rendering index Ra≥90) and transparency, resolving the contradiction between using organic materials for transparency and achieving color purity. The perovskite structure allows for excellent color saturation and purity while maintaining the transparency needed for display applications.
2Manufacturing precision
If halide perovskite is used as the light-emitting layer, then color purity is improved, but device stability may be compromised
Solution Approach 1:
The patent employs a composite material structure where halide perovskite is integrated with organic charge transport layers and inorganic charge injection layers. This composite approach leverages the advantages of each material type: halide perovskite provides high color purity and efficiency, while the surrounding organic and inorganic layers provide stability and protection, thereby achieving both high color purity and device stability simultaneously.
Solution Approach 2:
The patent introduces organic charge transport layers and inorganic charge injection layers as intermediary layers between the halide perovskite light-emitting layer and the electrodes. These intermediary layers protect the halide perovskite from degradation while facilitating charge transport, thus improving device stability without compromising the high color purity provided by the perovskite material.
3Reliability
If indium tin oxide and carbon nanotubes are used as injection layers, then electrical conductivity is improved, but device complexity increases
Solution Approach 1:
The patent segments the charge injection function into two distinct layers: an inorganic indium tin oxide layer for electron injection and an organic carbon nanotube layer for hole injection. This segmentation allows each layer to be optimized for its specific function, achieving high electrical conductivity and stable performance while maintaining a relatively simple overall device structure through clear functional division.
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 perovskite light-emitting device achieves high color purity and efficient light transmission with the use of indium tin oxide and carbon nanotubes, offering improved electrical conductivity and stability, and exceeding 20% external quantum efficiency for green and red light emission.
Implementation Method 1
the indium tin oxide with transparent and conductive properties is used as the first injection layer
Implementation Method 2
the carbon nanotubes themselves have good conductivity and stability, and when the carbon nanotubes are coated on the second transport layer, a conductive mesh structure is formed
Implementation Method 3
the holes between different carbon nanotubes allow light to pass through, thereby achieving light transmission
Implementation Method 4
by introducing the halide perovskite as the light-emitting layer, which has high fluorescence quantum efficiency
Implementation Method 5
magnetron sputtering indium tin oxide on a substrate to obtain a first injection layer
Data Source
AI summary
The present application discloses a perovskite light-emitting device, a preparation method thereof, and a display. The perovskite light-emitting device includes a first injection layer, a first transport layer, a light-emitting layer, a second transport layer, and a second injection layer, which are sequentially stacked, wherein the first injection layer includes indium tin oxide, the second injection layer includes carbon nanotubes, the light-emitting layer includes halide perovskite, and light emitted by the light-emitting layer is simultaneously emitted from the first injection layer and the second injection layer. The perovskite light-emitting device of the present application can stably emit light on double sides.