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Material World
Element · Ne

Neon

A noble gas whose only significant use is the one it is named for — glowing red in a tube — plus a quieter role in the lasers that print microchips.

Neon is the second-lightest noble gas and among the least reactive substances known: no stable neon compound has ever been made. It is present in the atmosphere in tiny proportion and is recovered as a by-product of liquefying air for oxygen and nitrogen, which makes its supply dependent on demand for other gases entirely.

Its fame rests on one property. Excited by an electric discharge, neon emits an intense orange-red that no phosphor or filter is needed to produce. Every other colour in what people call neon signage comes from a different gas or a coated tube; only the red is actually neon.

Uses

Neon signage is the visible use and the smaller one. The commercially critical application is the excimer laser used in photolithography — the machines that pattern silicon wafers rely on neon as the bulk gas in their laser cavities, and semiconductor manufacturing is sensitive to its supply in a way few outside the industry noticed until shortages made the news.

Liquid neon is also a cryogenic refrigerant with far greater cooling capacity per unit volume than liquid helium, used where that density matters more than reaching the very lowest temperatures.

Medium confidence Weak evidence

How we know: checked recently · only one source, so there is nothing to cross-check it against · stated directly by the source.

How this connects

Where a connection has been confirmed by an outside reference, that reference is named beside it.

is used as

  • Lighting — application · the orange-red no phosphor or filter is needed to produce

is produced by

  • Air separation — process · recovered as a side-stream in proportion to the air processed, never on its own account

is found in

  • Air — material · eighteen parts per million, recovered only as a by-product of large-scale oxygen production — which is why the semiconductor industry's neon supply depends on a handful of steelworks

Sources

  • Material World
    Our own writing
  • Wikidata
    Wikimedia Foundation · Creative Commons CC0 1.0 Universal (public domain dedication)
  • PubChem
    US National Library of Medicine · Mixed — aggregated third-party content, rights retained by depositors
  • NIST — National Institute of Standards and Technology
    United States Department of Commerce · US Government work — public information, credit requested

Questions this page answers

Where it comes from, and what it becomes

Follow Neon back to what it starts as, and forward into what it becomes. Each step is a documented one — a real route material takes, not a chain of inference.

Upstream — what it comes from

  • Neon → is produced by (recovered as a side-stream in proportion to the air processed, never on its own account) → Air separation → takes as input (the feedstock, and an unusual one in being free, unlimited and available anywhere — the cost is entirely the energy to liquefy it) → Air

Downstream — what it becomes

  • Neon → is used as (the orange-red no phosphor or filter is needed to produce) → Lighting