Used as a dopant in semiconductor materials, particularly in gallium arsenide (GaAs) and gallium nitride (GaN), which are critical in high-frequency and high-power electronic devices such as microwave circuits, LEDs, and power amplifiers. Widely employed in the production of solar cells due to its ability to improve efficiency in photovoltaic materials. Key component in the manufacturing of blue and green light-emitting diodes (LEDs) and laser diodes used in displays, Blu-ray technology, and optical communications. Utilized in thermometers as a non-toxic alternative to mercury, especially in medical and high-temperature applications. Plays a role in some medical imaging and radiopharmaceuticals, where gallium compounds are used to detect inflammation and certain types of cancer. Also used in alloys with low melting points for use in thermal safety devices and high-temperature thermometers.