University of Tokyo researchers have created tiny LED lights which levitate in the presence of ultrasound. Named Luciola for its resemblance to the firefly, each hemispherical particle weighs 16.2mg, has a diameter of 3.5mm, and emits a red light that can illuminate text. The developers hope Luciola will be commercially viable in 5-10 years for use in moving displays.
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05:07 pm on 23 Feb
Source
https://www.inshorts.com/en/news/japanese-scientists-invent-floating-firefly-light-1519385863029