Fluorescent tube

Abstract

The invention discloses a fluorescent tube, comprising a sealed first tube body, a phosphor powder layer and a protective layer. In particular, the phosphor powder layer is coated on the external wall of the first tube body, and the protective layer is coated on the phosphor powder layer; the protective layer is used for protecting the phosphor powder layer. The fluorescent tube can effectively avoid the phosphor powder coated on the fluorescent tube from performing chemical combination with gaseous mercury caused by bombard of plasma, thus avoiding producing mercury compound and consuming phosphor powder.

Description

technical field [0001] The present invention relates to a fluorescent tube (fluorescent tube), and in particular, the present invention relates to a fluorescent tube that can effectively prevent the fluorescent powder coated thereon from chemically reacting with mercury gas due to plasma bombardment, This avoids the formation of mercury compounds and the consumption of phosphors. Background technique [0002] The progress of society depends on the use and development of lighting equipment. Taking the United States as an example, in 1999 it consumed about 3 trillion kilowatt-hours of energy, of which lighting accounted for about 21%. Among all kinds of lighting, the white flag consumes 40% of the energy, which is about 252 billion kWh, and produces 15% of the light source. The more efficient fluorescent tubes and gas discharge lamps consume 60% of the energy, which is about 378 billion kWh, and produce 85% of the light source. In the United States in 2000, the market for l...

AI Technical Summary

Problems solved by technology

[0006] However, as the operation time increases, the temperature of the sealed tube body 10 will also rise accordingly, and the increase in the amount of evaporated mercury will also increase the mercury pressure in the tube, which will affect the relationship between the current and voltage of the gas discharge, and make the luminescence not stable. Stablize

The amount of mercury and phosphor 14 combined to form a stable compound increases, which will also increase the difficulty of recycling mercury and phosphor in damaged fluorescent tubes

In addition, mercury-containing fluorescent tubes are discarded in the field. If the tube wall is broken and the mercury-containing fluorescent powder 14 is exposed to the air, it will dissolve in water after the action of rainwater, causing the mercury to flow into the soil or rivers with the rainwater, causing soil and water pollution. serious environmental problems

Furthermore, when recycling the damaged sealed tube body 10, because the compound combined with mercury and phosphor is not easy to separate, the cost of its reuse is high, and the willingness of manufacturers to recycle waste lamp tubes is low, resulting in waste of material resources and serious environmental protection problems.

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