Fluorescent Lamps Explained with Quantum Physics - A Level Physics

This video introduces fluorescent lamps and explains them with quantum physics for A Level Physics.

These common light fittings are used because they are relatively cheap and highly efficient. A glass tube is filled with mercury vapour at a low pressure. When excited by electrons the mercury atoms become ionised, losing an electron. As the electron returns to its ground state, it then emits an ultraviolet photon. A phosphor coating on the inside of the tube then absorbs the UV photon, finally emitting a range of visible photons which we see as white light.

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