Fluorescent lamp tube with inner wall coatings

The utility model relates to a fluorescent tube with coating on the inner wall and relates to the fluorescent lamp field. The utility model aims at solving the problems of the prior art that more black sodium amalgam generate, the lumen output of a lamp is reduced and the lumen depreciation is poor. Water diluent material of nanometer titanium dioxide is used for coating the inner wall of the florescent tube. And a film structure is formed, the internal of which is lamp inner wall glass and the external of which is the titanium dioxide coating. The coating thickness is generally 0.8-1.3 Mu m, and the selected particle of the nanometer titanium dioxide is 10-80nm. The nanometer titanium dioxide has the characteristics of stable mechanical properties, good compatibility with base material, all-round shielding, etc. Thus, compared with the alumina coating used in the prior art, sodium atoms are hard to diffuse to the surfaces of phosphor particles through the thermal diffusion to react with mercury atoms, the black sodium amalgams are reduced greatly, the lumen depreciation is increased by 6-8 percent than the common alumina coating, and the service life of the lamp is greatly prolonged.