| Application | Neon glows with a bright red‑orange light when electrified, making it the premier fill gas for outdoor advertising signs and architectural lighting displays. Tiny neon glow lamps serve as reliable power‑on indicators and circuit‑testing devices in electronics. Neon is the active lasing medium in helium–neon (He–Ne) lasers at 632.8 nm, extensively used in laboratory spectroscopy and medical diagnostics. As a buffer gas in excimer laser mixtures, neon enables deep‑ultraviolet photolithography for semiconductor chip fabrication. Liquefied neon provides a cryogenic refrigerant with ~40× the cooling capacity of liquid helium, ideal for ultra‑low‑temperature research.
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