By Contributor – Updated March 24, 2022
Neon was first isolated in 1898 by William Ramsay and M.W. Travers. As one of the six noble gases—alongside helium, argon, krypton, xenon, and radon—neon is chemically inert, meaning it rarely reacts with other elements. Its unique electronic structure gives it a distinct red glow, making it the first gas ever used to create illuminated signs.
Gas‑filled tubes containing neon can last between eight and fifteen years, depending on power, tube quality, and usage patterns. Neon signs, now synonymous with bright, eye‑catching advertising, also find use in decorative lighting, such as under‑car accent lights and nighttime bedroom fixtures.
The first U.S. neon sign appeared in 1925, marking the beginning of a new era in visual communication. Today, designers can create signs featuring dozens of colors by combining different gases, elements, colored glass, and fluorescent powders.
When voltage is applied, electrons are liberated from the atoms inside the tube. These free electrons collide with other atoms, become excited, and then fall back into lower energy states. During this transition, they release energy in the form of visible light—the familiar glow of a neon sign.
Each noble gas emits a characteristic color when excited:
By blending gases and adding small amounts of metal salts, manufacturers can craft a wide spectrum of hues. Fluorescent powders coated on the inside of glass tubes further refine the shade, while colored glass itself can enhance or alter the final appearance.
Each letter or element of a neon sign is assembled and sealed separately, allowing designers to mix colors within a single sign without contamination. This modular approach has made neon a versatile medium for artistic expression as well as commercial messaging.
