Gallium

(source: https://www.rsc.org/periodic-table/element/31/gallium)

Gallium arsenide is an important component of many semiconductors.

It is also used in red LEDs: Epitaxial wafer for light-emitting diode (1996).

Solar panels containing gallium arsenide have been used in planetary exploration (Gallium Arsenid Solar Cell Systems (1987)).

Gallium nitride is also a semiconductor.; it has particular properties that make it very versatile. It has important uses in Blu-ray technology (Gallium nitride-based semiconductor laser diode (2011)), mobile phones, and blue LEDs (Blue light emitting LED of gallium nitride semiconductor – has semi-insulating p=doped I-layer with double layer structure of low and high impurity concentration respectively (1993)), and green LEDs (High brightness gallium nitride-based light emitting diode with transparent conducting oxide spreading layer (2006)).

It remains liquid over a large temperature range, which makes it ideal as a liquid metal thermometer for recording very high temperatures which would vaporise a normal thermometer (Use of metallic gallium alloys as an expansion liquid in thermometers (2004)).

Gallium also melts in your hand: https://youtu.be/0Hx2DYx4umQ.

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References:

All patent information has been obtained from Espacenet (European Patent Office).