Question

what are cfl bulb and tubes coated with​

Answer 1

Answer:

Delving deeper, the CFL contains a few key components involved in this emission of visible light including the presence of elemental mercury vapor, a noble gas (argon, xenon, neon or krypton) and an inner coating called a phosphor which is the substance actually responsible for producing visible light out of the CFL.

Answer 2

Answer:

In a CFL, an electric current is driven through a tube containing argon and a small amount of mercury vapor. This generates invisible ultraviolet light that excites a fluorescent coating (called phosphor) on the inside of the tube, which then emits visible light.