Micro LED Wavelength Conversion Layer for Color Tuning
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Solution Overview
Problem
Current micro LED devices lack the ability to efficiently produce tunable color emission spectra for lighting and display applications, relying on bulk materials that do not offer the same level of color tunability as quantum dots, and existing technologies face challenges in integrating quantum dots effectively for white backlighting in LCDs and QD-LEDs.
Innovation Solution
The integration of micro LED devices with a wavelength conversion layer containing phosphor particles, such as quantum dots, around the micro LED devices, allowing for precise control of light emission spectra through the size and shape of the phosphor particles, enabling the creation of specific color emission profiles and improved color gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If quantum dots are used for wavelength conversion, then color tunability and emission precision are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The wavelength conversion function is segmented into multiple quantum dot layers, each layer containing quantum dots of specific sizes that emit at different wavelengths. This segmentation allows precise control over the emission spectrum while maintaining manageable device structure through modular layering
Solution Approach 2:
Different regions of the device utilize quantum dots with locally optimized properties - smaller quantum dots for blue-green emission in certain layers, larger quantum dots for red emission in other layers. Each layer is tailored with specific quantum dot size distributions to achieve the desired color emission profile at that location
2Area of moving object
If micro LED size is reduced, then pixel density and resolution are improved, but light emission intensity decreases
Solution Approach 1:
The device combines micro LEDs with quantum dot wavelength conversion layers to create a composite structure. The quantum dot layer acts as an optical amplifier that converts the LED's emission into a broader, more intense spectrum, effectively boosting the light output intensity while maintaining the small micro LED footprint
Solution Approach 2:
Instead of increasing micro LED area in the planar dimension to boost intensity, the solution adds a vertical dimension through multiple quantum dot conversion layers. This multi-layer stacking approach intensifies the emitted light through cumulative wavelength conversion without increasing the horizontal pixel area
3Manufacturing precision
If quantum dot size is reduced, then emission wavelength shifts to blue-violet region, but manufacturing control and uniformity become more difficult
Solution Approach 1:
The quantum dot size distribution is segmented into discrete groups, with each group targeting a specific wavelength range. Rather than attempting to manufacture a continuous size distribution, the process produces distinct size categories that are easier to control and manufacture with current technology
Solution Approach 2:
The manufacturing approach changes the critical parameter from precise continuous size control to controlled size ranges. By accepting and optimizing for discrete size categories rather than continuous variation, the manufacturing process becomes more robust and easier to implement with existing quantum dot synthesis techniques
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 solution enables highly efficient light emission with reduced power consumption, precise color control, and improved color mixing, allowing for the production of a wide range of colors and patterns, including white light, while minimizing unintended color shifts and secondary absorption issues.
Implementation Method 1
The micro LED device can be designed to emit at specific wavelengths in the ultraviolet (UV) or visible spectrum
Implementation Method 2
a wavelength conversion layer around the micro LED device. The wavelength conversion layer includes phosphor particles
Implementation Method 3
The phosphor particles exhibit luminescence due to their composition
Data Source
AI summary
A light emitting device and method of manufacture are described. In an embodiment, the light emitting device includes a micro LED device bonded to a bottom electrode, a top electrode in electrical contact with the micro LED device, and a wavelength conversion layer around the micro LED device. The wavelength conversion layer includes phosphor particles. Exemplary phosphor particles include quantum dots that exhibit luminescence due to their size, or particles that exhibit luminescence due to their composition.