Micro Panchromatic QLED Array via Deep Silicon Etching Templates
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Solution Overview
Problem
Current micro-LEDs face challenges in achieving multi-color display due to high technological complexity and physical damage from external environments, making it difficult to fill and transfer multi-color quantum dots effectively.
Innovation Solution
A micro panchromatic QLED array device is developed using a quantum dot transfer process of deep silicon etching templates, where a substrate with a blue/violet LED epitaxial wafer is etched to form square table structures and micro holes, filled with red, green, yellow, and blue quantum dots, and isolated with a light absorption material to enhance light isolation and reduce physical damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a micro pillar structure is adopted for micro-LEDs, then light output and transfer of electroluminescence spectra are improved, but physical damage from external environments increases and quantum dot filling becomes difficult
Solution Approach 1:
The invention divides the micro-LED structure into separate components: the micro pillar for light emission and the micro hole for quantum dot placement. This segmentation allows the micro pillar to maintain its light output advantages while the micro hole provides protection against physical damage and facilitates quantum dot filling.
Solution Approach 2:
The micro hole structure acts as an intermediary between the external environment and the quantum dots. It protects the quantum dots from physical damage while still allowing optical interaction with the micro pillar structure, resolving the contradiction between protection and functionality.
2Loss of energy
If multiple monochromatic lights are mixed (RGB-LED mode), then lighting quality with higher quantum efficiency is achieved, but technological complexity increases making multi-color quantum dot filling difficult
Solution Approach 1:
The invention segments the color generation process by using individual micro holes for each quantum dot color (red, green, yellow, blue) rather than requiring complex multi-color quantum dot filling in a single structure. This simplifies the manufacturing process while maintaining high quantum efficiency through selective quantum dot placement.
Solution Approach 2:
Each micro hole is designed with specific local properties (size, depth, position) optimized for holding specific quantum dot colors. This local optimization allows different quantum dots to be placed in different micro holes with high precision, achieving multi-color display without increasing overall device complexity.
3Manufacturing precision
If quantum dots are transferred to micro-LEDs, then color conversion is improved, but physical damage to quantum dots increases due to external environment exposure
Solution Approach 1:
The quantum dots are placed in the micro holes before final assembly, and the micro hole structure provides immediate protection. This preliminary placement in a protected environment prevents physical damage during subsequent manufacturing steps while maintaining precise color conversion properties.
Solution Approach 2:
The micro hole structure acts as a protective shell or cavity that encloses the quantum dots, shielding them from external physical damage while allowing optical interaction for color conversion. This protective enclosure maintains quantum dot integrity throughout the device lifecycle.
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 method allows for high-yield, low-cost production of QLEDs with improved lighting performance and color conversion, enabling effective multi-color display without the need for dedicated ink-jet printing devices, thus overcoming the limitations of traditional micro-LED technologies.
Implementation Method 1
a blue LED is matched with fluorescent powder to form white light; and (2) multiple monochromatic lights are mixed, namely an RGB-LED
Implementation Method 2
isolated with a light absorption material to enhance light isolation
Data Source
AI summary
A micro panchromatic QLED array device based on a quantum dot transfer process of deep silicon etching templates. Array-type square table structures pass through a p-type GaN layer and a quantum well active layer and are deep to an n-type GaN layer are disposed on a blue LED epitaxial wafer, wherein micro holes are formed through etching in the structures. Every 2*2 table structures constitute an RGB pixel unit. Among the four micro holes, three of the holes are filled with red light, green light and yellow light quantum dots respectively, and one of the holes emits blue light/is filled with a blue light quantum dot. Micro holes in a silicon wafer are formed through etching with a deep silicon etching technology; the micro holes in the silicon wafer are aligned with quantum dot filling areas on a micro-LED.