The research progress of mercury-free metal halide solar lamp

Current proposed to replace the metal halide is another class of substances such as mercury ScI2, ZnI4 etc, these substances into can make in the 40 - mercury-free metal halide lamp work 70 volts light pressure drop, but this kind of metal halide lamp light pressure drop increase is not due to formation of large elastic collision electronic suffered under high pressure, but because the discharge near the arc area and the metal halide molecule dissociation appeared a lot of free Br or I atoms, this kind of electronegative halogen atom is easy to electronic form a negative ion adsorption, the space charge effect of a large number of negative ions to make the space of potential gradient rise form the high pressure drop light. In such a state of ionization excitation of the decrease in the number of electrons, and energy slants big, ionization excitation efficiency is lower, photosynthetic efficiency is low and the arc bending. The emergence of a large number of free halogen atoms will corrosion effect to the light components in the lower the lamp life, thus completely with metal halide instead of mercury is not the best policy. Snow Wright mercury-free metal halide lamp r&d snow Wright mercury-free metal halide lamp is adopted and the patent of different approaches, snow Wright is used to replace the mercury selenium element form material ( Se) 。 Selenium is a trace elements necessary for human body, it is said that each day if added 200 ugse can prevent cancer, too, of course, is toxic. Se valence of plus or minus 2 minus 2 price, atomic weight for 78. 96, there are 6 kinds of non radioactive isotope, ranked 34 in the periodic table, 6 of the family, is a kind of semiconductor materials, room temperature is stable, Se the ionization potential of 9. 75V( Slightly less than 10 of Hg. 4V) Potential for 5, resonant. 95 V and 6, 30 V ( Mercury is 4. 67 and six. 70V) ； The corresponding harmonic radiation spectrum for 207. 4 nm and 196 nm ( Hg for 253. 7海里,185海里) The Hg allows, all of these parameters, more important is the Se does not have any chemical reaction, and tungsten, molybdenum and Se the boiling point of temperature is 688 ~ (only 2 is higher than that of mercury 356. 6 ~ C but less than a lot of light with metal halide, zinc is lower than that in the normal work of the metal halide lamp arc tubes temperatures all vaporizing easily, forming a high enough Se steam pressure, thus ensuring close to filling mercury lamp buffer vapor density and the main working parameters, such as the pressure drop is the lamp of about 50 ~ 70 v, about 70 - light efficiency 80 lm / w。 Such as polyatomic molecule, so under the condition of Se for mercury will appear all sorts of selenium excitation spectra of molecules ( Superposition of molecular spectroscopy and atomic spectrum). , thus the rich continuous spectrum and infrared spectrum, and photosynthetic efficiency decreased after using selenium instead of mercury is caused by rich red light and infrared radiation. While the emergence of a large number of continuous spectrum color rendering of lamp significantly improved. Snow Wright photoelectric developed two types of mercury-free metal halide lamp, one kind is filled with high pressure xenon 35 w selenium metal halide lamp, small power motor of the study results show that the different color WenJin halide lamp to selenium generation after mercury lamp of color temperature, photosynthetic efficiency and pressure drop are slightly lower, the color rendering index were significantly increased compared with that of red. Snow Wright photovoltaic research and development of another class of mercury-free metal halide lamp is in the power of 250 w with the stage of low-pressure argon filling selenium metal halide lamp, its relevant situation similar to 35 v/se xenon metal halide lamp. Developed in such no mercury lamp spectrum is still a little residual mercury in the spectrum of trace, this is because to keep a good and joined the trace HgBr by tungsten halogen cycle. After finding pure HgBr2, completely can be used to replace HgBr made absolutely no mercury lamp. Regardless of the automotive xenon metal halide or stage with selenium selenium argon metal halide lamp are close to filling mercury lamp structure ( Figl、Pig2) 。 Snow Wright photoelectric has also developed a compound Hgse [ 7] Instead of Hg has no element mercury metal halide lamp, the lamp with various parameters between mercury metal halide lamp and selenium for filling all kinds of metal halide lamp, mercury nig5 shows that in low argon filled with 250 w with compound Hgse instead of element of Hg stage metal halide lighting spectrum curve, due to high temperature region of the arc Hgse is decomposed into Hg and Se atoms, so in no mercury lamp to Hgse instead of mercury appeared obvious Hg; Of course also appeared the selenium spectral spectrum. Mercury-free metal halide lamp development has been included in the agenda, the snow Wright took the lead in this field to make the exploration pace, in has developed a variety of no mercury lamp scheme has obvious feasibility and superiority of our project. This scheme to replace the mercury is a non-toxic, stable chemical properties of selenium, the material does not react with any materials in the lamp, low evaporation temperature, evaporation after for neutral atoms or polyatomic molecules pure selenium steam, can become a good performance of the buffer gas and long-term stability can be guaranteed to work. Snow Wright optoelectronic