Do tube lights emit multicolored light?
The sunset is just falling; the flower lights come on. The brightly colored tube lights combine all kinds of letters and drawings, adorn the whole bustling street like bright fireworks, making the eyes of the eye can’t see it.
Have you ever thought of why tube lights emit colorful light when watching this beautiful street?
The earliest electric lamps that humans used were filament lamps, a product invented by the inventor Edison. This type of bulb allows current to flow through the filament. After reaching the whitening state, it emits light. The efficiency is very low because most of the electricity turns into heat dissipated, only a small part transformed into light. In 1802, American scientist Hubert had hypothesized that if a filament is not fitted in a vacuum glass tube but loaded with some gas so that the excited gas emits light, it is possible to reduce Heat dissipation? So he loaded a small amount of mercury vapor into the vacuum tube and inserted two electrodes at the tube’s ends. After applying the voltage, under the electric arc’s spark, the mercury vapor emitted glare. The spectrum of this type of light is close to the sun; the glare is very strong, which is very suitable for movie shooting. It was later called a mercury lamp.
The success of the mercury lamp makes people excited. Can a mercury lamp be illuminated after being electrified, so can it be with other gases? Someone immediately thought of some very rigid inert gases that were discovered by scientists a decade ago. This gas has very stable properties, does not react with almost any other matter, and uses them to withstand stimulation and emit light is a very good choice.
In 1910, the French chemist Claude loaded nitrogen – a colorless inert gas, into the tube. After the electrolysis, the neon gas undergoes an electric field, emitting a mandarin-colored light. The neon light’s red light has a very strong penetrating force in the air that can penetrate thick fog. Therefore, neon lights are often used in port, airport, and traffic lights. Based on the English transliteration of the word “nêon,” people call that lamp a neon or neon lamp. Argon is another inert gas; its content in the air reaches 1%, relatively easy to obtain. Under the electric field’s stimulation, the argon will emit a faint indigo light, so it can also be used to fill tube tubes. In addition to nitrogen and argon, there are also tubes filled with helium gas, which can emit pale red light. Tube lamps are containing a mixture of four types of gases (or three, two types) of nitrogen, argon, helium and mercury vapor, etc.
Due to the different proportions of gases, one receives, tubes of different colors are available. Why, then, is the light emitted by different gases having a different color? We know that an atom is made up of an atomic nucleus and a few electrons spinning around it. The inner ring electron subject to the electric field’s stimulation can absorb “some yield” of energy and jump into some outer orbital, into a state subject to the stimulation. Because the excited state is very unstable, it can soon jump back to its original orbit and emit “yield” of the newly absorbed energy in the form of light. That energy yield is just right equal to the atom’s energy difference in the excited state and the initial state.
Different gases have different atomic structures and energy levels, the amount of absorbed and radiated energy that is large and small. So the frequency of light radiated by that energy “one” is also different, but the light’s color is determined entirely by the frequency. Therefore, tubes filled with different gases emit light of different colors.