Continuous Fluidic Printing Of MicroLEDs

Tech ID: 30100 / UC Case 2019-164-0

Brief Description

A fluidic printing technique for inorganic semiconducting materials and devices using acoustic focusing.


Micro light-emitting diodes (LEDs) that use III-nitrides and III-V semiconductors are being used in display applications such as near-eye displays for virtual and augmented-reality and in large-area self-emitting displays. Mass transfer techniques that use pick and place methods are commonly used. While these mass transfer techniques are important for integrating microLEDs with different colors, pick and place methods are time consuming when transferring a large number of devices and limit the scalability of current mass transfer methods. 


Researchers at the University of California, Santa Barbara have created a fluidic printing technique for inorganic semiconducting materials and devices using acoustic focusing.  With this process, the orientation of devices can be controlled by the application of external electric or magnetic fields. The process takes advantage of acoustic focusing to align microLEDs into position in a solid-liquid two-phase mixture and to print microLEDs in an ordered two- dimensional array. This allows for scalable mass transfer techniques suitable for microLEDs and overcomes the challenges of the conventional pick-and-place methods.  The process is compatible with fluidic and other printing methods.


  • Allows fluidic printing and roll-to-roll manufacturing of II-nitride micro-LEDs
  • Compatible with multiple printing methods


  • MicroLEDs 

Patent Status

Patent Pending


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Other Information


Semiconductor materials, Printing technique, MicroLEDs, Acoustic focusing, indfeat, indled

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