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Proceedings Paper

Realization of high efficiency ultrasound-powered micro-LEDs for optogenetics
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Paper Abstract

We present the fabrication, characterization, and demonstration of high-efficiency ultrasound-powered micro- light emitting diodes (μLED) for use in optogenetic applications. InGaN based blue-emitting LED material wafers grown on a patterned sapphire substrate (PSS) were used to assist in the out-scattering of the light. The turn-on voltage of the LEDs is around 2.5 volts and the electrical ideality factor is 1.2 confirming high radiative recombination efficiency. A power density of more than 50 mW/mm2 was obtained from a 130 x 300 μm2 LED with a mesa of 100 μm diameter at 3 mA which is much more than is required to excite channelrhodopsin transfected neural cells. A high external quantum efficiency (EQE) of 33% is obtained at 3 mA measured in an integrating sphere. The peak wavelength of the μLED was measured at 483 nm at different current densities. The μLEDs are integrated directly onto a rectifier and Piezoelectric Transducer (PZT) harvester to realise a highly efficient ultrasound-powered light delivery unit capable to generate mWs of optical power. The concept was validated by powering the integrated device with ultrasound.

Paper Details

Date Published: 2 April 2020
PDF: 8 pages
Proc. SPIE 11364, Integrated Photonics Platforms: Fundamental Research, Manufacturing and Applications, 113641I (2 April 2020); doi: 10.1117/12.2555762
Show Author Affiliations
Tanmay Mondal, Univ. College Cork (Ireland)
Kjeld Laursen, Aarhus Univ. (Denmark)
Seyedsina Hosseini, Aarhus Univ. (Denmark)
Amin Rashidi, Aarhus Univ. (Denmark)
Farshad Moradi, Aarhus Univ. (Denmark)
Brian Corbett, Univ. College Cork (Ireland)

Published in SPIE Proceedings Vol. 11364:
Integrated Photonics Platforms: Fundamental Research, Manufacturing and Applications
Roel G. Baets; Peter O'Brien; Laurent Vivien, Editor(s)

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