Mercury alloy for low gas pressure discharge lamp

Abstract

This invention discloses a Hg alloy containing InPbSnHg used in low air pressure gas discharge lamps, in which, the mass ratio of them is: In : Pb : Sn :Hg=20-38 :12-30 :22-50 :2-8. This invented Hg alloy enables the accuracy of Hg air pressure about 0.8Pa in the working temperature region 100-130deg.C.

Description

technical field [0001] The invention relates to a solid amalgam material, in particular to an amalgam for a low-pressure gas discharge lamp. Background technique [0002] Low-pressure gas discharge lamps use ultraviolet rays with a wavelength of 253.7nm to sterilize or excite phosphors to generate visible light. The output of ultraviolet radiation with a wavelength of 253.7nm has the highest quantum efficiency near the mercury vapor pressure of 0.8Pa. Compact fluorescent lamps, built-in compact fluorescent lamps (compact fluorescent lamps with outer bulbs, PAR lamps with built-in compact fluorescent lamps), electrodeless lamps, germicidal lamps, small-diameter cold cathode fluorescent lamps, etc., such low-pressure gas discharge lamp tube walls The temperature is high, the mercury vapor pressure of liquid mercury is much higher than 0.8Pa at high temperature, the output efficiency of 253.7nm ultraviolet radiation is low, and the luminous efficiency is low. To obtain high lum...

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Problems solved by technology

Compact fluorescent lamps, built-in compact fluorescent lamps (compact fluorescent lamps with outer bulbs, PAR lamps with built-in compact fluorescent lamps), electrodeless lamps, germicidal lamps, small-diameter cold cathode fluorescent lamps, etc., such low-pressure gas discharge lamp tube walls The temperature is high, the mercury vapor pressure of liquid mercury is much higher than 0.8Pa at high temperature, the output efficiency of 253.7nm ultraviolet radiation is low, and the luminous efficiency is low. To obtain high luminous efficiency, it must be controlled and stabilized at a higher temperature. At present, bismuth-indium amalgam is generally used instead of liquid mercury, and the bismuth-indium amalgam is placed in the exhaust pipe of the lamp. The temperature at the amalgam varies depending on the lamp specification and structure, and is between 85-135°C.

For traditional bismuth-indium amalgam in the working temperature range of 70-120°C, the change law of mercury vapor pressure with temperature rise is: 0.3Pa-0.8Pa-0.3Pa-0.8Pa-2.5Pa, in this temperature range relative to liquid mercury It has high luminous efficiency, but the mercury vapor pressure of bismuth-indium amalgam fluctuates greatly with the change of temperature. In the middle temperature range of 95-110℃, the mercury vapor pressure will drop to 0.3Pa or even lower. Some lamps are due to discrete The main reason is that the bismuth-indium amalgam is in this temperature range, and the luminous efficiency is low; at the same time, the light output of the bismuth-indium amalgam is significantly lower when it is higher than 125°C, and the working temperature is lower than 135°C.

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