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Monolithic chip-scale integration of QD color converters with GaN microLED chips

Manufacturing in particular mass transfer and repair remain the biggest challenges in realization of microLED displays. To simplify the process, many propose to transfer only the blue (or even a UV) LED and achieve RGB by depositing color converters such as quantum dots. This requires an additional deposition step. But what if one could achieve chip-scale monolithic integration of QDs and GaN microLED chips? Indeed, Saphlux proposes just this and will present this on 30Nov-1Dec 2022 at TechBlick's microLED and QD event

Saphlux has taken this approach one step further. Instead of post-transfer deposition of QDs, their technology enables chip-scale integration of quantum dots and microLEDs. In this technique, a nano-porous structure is directly formed inside LEDs to serve as a natural vessel for in-situ QD integration. The effective light path can be extended by nano-porous structure to boost the overall efficiency due to the strong scattering effect. The reliability of quantum dots is - it is claimed- also improved greatly because of the high thermal conductivity of gallium nitride material.

Importantly, this technology claims to be able to integrate red, green, and blue pixels monolithically into a single chip to greatly reduce the complexity and cost of Micro-LED display manufacturing.

In this technique, nanopores in LEDs can be created by dipping the material in an acidic solution and applying a bias voltage, which drives electro-chemical etching of n-type GaN. By adjusting the etching voltage, one can change both the porosity and the size of the nanopores. Then the blue LED are bonded with exposed nanopores GaN to a current-driver panel and red/green QDs are selectively loaded to achieve Micro-LED full-color conversion.

Saphlux will present this on 30Nov-1Dec 2022 at TechBlick's microLED and QD event


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