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A CCFL consists of a tube filled with a mixture of mercury vapour and ‘penning gas’ at about 7 hPa pressure.
The gas discharge mainly produces a 253.7 nm ultraviolet radiation from mercury atoms. Meanwhile, the penning gas enhances the ionization of mercury at lower voltage.
The interior of the tube is covered with a mixture of phosphorus to convert ultraviolet into visible light.
A broad range of colours can be obtained by an appropriate choice of phosphorus.
