Monolithic Flexible Vertical GaN Light-Emitting Diodes for a Transparent Wireless Brain Optical Stimulator

Advanced Materials
Han Eol LeeKeon Jae Lee

Abstract

Flexible inorganic-based micro light-emitting diodes (µLEDs) are emerging as a significant technology for flexible displays, which is an important area for bilateral visual communication in the upcoming Internet of Things era. Conventional flexible lateral µLEDs have been investigated by several researchers, but still have significant issues of power consumption, thermal stability, lifetime, and light-extraction efficiency on plastics. Here, high-performance flexible vertical GaN light-emitting diodes (LEDs) are demonstrated by silver nanowire networks and monolithic fabrication. Transparent, ultrathin GaN LED arrays adhere to a human fingernail and stably glow without any mechanical deformation. Experimental studies provide outstanding characteristics of the flexible vertical μLEDs (f-VLEDs) with high optical power (30 mW mm-2 ), long lifetime (≈12 years), and good thermal/mechanical stability (100 000 bending/unbending cycles). The wireless light-emitting system on the human skin is successfully realized by transferring the electrical power f-VLED. Finally, the high-density GaN f-VLED arrays are inserted onto a living mouse cortex and operated without significant histological damage of brain.

References

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Citations

Oct 12, 2019·Sensors·Young-Geun ParkJang-Ung Park
Sep 2, 2020·Advanced Materials·Seong Kwang HongKeon Jae Lee
Apr 17, 2020·Advanced Materials·Yong-Cheol JeongDaesoo Kim
Sep 10, 2019·Journal of Colloid and Interface Science·Jianan WangRob Atkin
Aug 21, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Alexey V GulyukAlbena Ivanisevic
Oct 16, 2019·ACS Applied Materials & Interfaces·Young-Geun ParkJang-Ung Park
Aug 28, 2021·ACS Applied Materials & Interfaces·Yu-Hang JiPaul K Chu

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