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Artifical Source for UV Sticker Label
Release time:2013-10-07 Source:admin Reads:
A black light is a lamp that emits long-wave UVA radiation and little visible light. Fluorescent black light lamps are constructed in the same fashion as normal fluorescent lights, except they use a phosphor on the inner tube surface which emits UVA light instead of visible white light. BLB type lamps use filtering glass which is deep-bluish-purple optical filter which blocks almost all visible light above 400 nanometres. The color of such lamps is often referred to in the lighting industry as "blacklight blue" or "BLB", to distinguish them from UV sticker labels used in "bug zapper" insect traps, that do not have the optical filter coating. These are designated "blacklight" ("BL") lamps. The phosphor typically used for a near 368 to 371 nanometre emission peak is either europium-doped strontium fluoroborate (SrB4O7F:Eu2+) or europium-doped strontium borate (SrB4O7:Eu2+), whereas the phosphor used to produce a peak around 350 to 353 nanometres is lead-doped barium silicate (BaSi2O5:Pb+). "Blacklight Blue" lamps peak at 365 nm. A black light may also be formed, very inefficiently, by simply using Wood's glass, a deep bluish-purple nickel oxide doped glass which filters out all light besides UV, instead of clear glass as the envelope for a common incandescent bulb. This was the method used to create the very first black light sources. Though cheaper than fluorescent UV sticker labels, only 0.1% of the input power is converted to usable radiation, as the incandescent light radiates as a black body with very little emission in the UV range. Incandescent bulbs used to generate significant UV, due to their inefficiency, may become dangerously hot. High-power mercury-vapor black lights that use a UV-emitting phosphor and an envelope of Wood's glass are also made, in ratings up to 1 kW, used mainly for theatrical and concert displays. Some UV sticker labels fluorescent bulbs specifically designed to attract insects use the same near-UV emitting phosphor as normal blacklights, but use plain glass instead of the more expensive Wood's glass. Plain glass blocks less of the visible mercury emission spectrum, making them appear light-blue to the naked eye. These lamps are referred to as "blacklight" or "BL" in most lighting catalogs.

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