Corey is an American semiconductor equipment manufacturer, and XPE is the brand trademark of Corey LED. The brand's products include LED, hand-cranked light bulbs, industrial and mining LED lights, stage LED lights and so on.

Light-emitting diode is called led for short. Made of compounds containing gallium (Ga), arsenic (As), phosphorus (P), nitrogen (N), etc. When electrons recombine with holes, they can emit visible light, so they can be used to make light-emitting diodes. Used as an indicator light in circuits and instruments, or as a text or digital display. Gallium arsenide diodes emit red light, gallium phosphide diodes emit green light, silicon carbide diodes emit yellow light and gallium nitride diodes emit blue light. Because of its chemical properties, it can be divided into organic light-emitting diode and inorganic light-emitting diode LED.