Quantum Dot Conversion Elements on Carrier Substrates
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Solution Overview
Problem
Conventional conversion materials for LEDs, such as phosphors, struggle to achieve a broad color range due to their broad band emission, which is difficult to manage in high-resolution displays like 2K or 4K Ultra High Definition screens, whereas quantum dot wavelength converters offer narrow band emission but cannot be directly arranged on LEDs for stability reasons.
Innovation Solution
A method involving a carrier substrate with a matrix material and a barrier substrate is used to produce conversion elements, where quantum dot wavelength converters are integrated in a non-continuous pattern, allowing for precise application on LEDs, either directly or semi-remotely, to achieve high color purity and flexibility in emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If quantum dot wavelength converters are directly arranged on LEDs, then color purity and emission flexibility are improved, but stability deteriorates
Solution Approach 1:
The patent introduces a carrier substrate as an intermediary component between the LED and the quantum dot wavelength converter. This carrier substrate provides mechanical support and stability while allowing the quantum dot converter to be positioned close to the LED for optimal optical performance. The carrier substrate acts as a mediator that enables both direct arrangement benefits (color purity) and stability requirements to coexist.
2Reliability
If conventional phosphor converter materials are used, then stability is maintained, but color range and emission precision deteriorate
Solution Approach 1:
The patent changes the material parameter from conventional phosphor to quantum dot wavelength converter, which fundamentally alters the emission characteristics. Quantum dots provide narrow band emission with precise controllable wavelengths, enabling high color purity and broad color range while maintaining stability through the carrier substrate support structure.
3Reliability
If conversion elements are produced with complex multilayer structures, then stability and protection are improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the conversion element into distinct functional layers: a carrier substrate for mechanical support, a quantum dot wavelength converter layer for optical conversion, and optional barrier substrate layers for protection. This segmentation allows each layer to be optimized independently and simplifies the manufacturing process compared to integrated complex structures.
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
This approach enables the production of conversion elements with quantum dot wavelength converters that can be applied directly or semi-remotely to LEDs, providing high color purity and flexibility in emission, addressing the stability and color range challenges of conventional materials.
Implementation Method 1
quantum dot wavelength converters offer narrow band emission
Data Source
AI summary
A method for producing a plurality of conversion elements (10) is specified, comprising providing a carrier substrate (1), introducing a converter material (3) into a matrix material (2), applying the matrix material (2) with the converter material (3) to individual regions (8) of the carrier substrate (1) in a non-continuous pattern, applying a barrier substrate (5) to the matrix material (2) and to the carrier substrate (1), and singulating the carrier substrate (1) with the matrix material (2) and the barrier substrate (5) into a plurality of conversion elements (10) along singulation lines (V), wherein the conversion elements (10) in each case comprise at least one of the regions (8) of the matrix material (2).