Guangmai Technology is professional in making the 265nm UVC LED 6565 6868 4W 8W for sterilizer.
Questions about GMKJ UVC smd leds:
Can deep ultraviolet rays decompose formaldehyde?
There are two kinetic processes in the decomposition of formaldehyde by ultraviolet rays: one is that photolysis is directly interrupted by ultraviolet rays; the other is that ultraviolet rays interact with water in the air to generate OH radicals and decompose formaldehyde. (Mercury tubes are fine). Deep ultraviolet rays can directly decompose organic pollutants such as formaldehyde by breaking the chemical bond of formaldehyde.
Can deep ultraviolet decompose organic pollutants such as formaldehyde? In fact, many people think it should not work, but in fact it can. The bond energy of the O-O bond is 5.1eV corresponding to 243nm, but the necessary C-H bond energy in organic matter is 4.31eV, corresponding to 283nm, and C-O is 3.39eV corresponding to 366nm. Ultraviolet photon energy can be higher than the bond energy to break it, just as it destroys the DNA molecular chain, so ultraviolet light can decompose formaldehyde.
But we should also note that the decomposition process of formaldehyde is actually very complicated, and its two decomposition processes are also directly related to the wavelength. Changes in the quantum yield of the decomposition process of formaldehyde at different wavelengths. Although I don't understand what the two peaks are at 305nm and 340nm, there is no doubt that ultraviolet rays can decompose formaldehyde by themselves. It can be decomposed by analogy to toluene, TVOC, and ultraviolet light.
How far is the transmission distance of deep ultraviolet UVC-LED in water?
Both pure water and tap water show good transmission characteristics for light with wavelengths between 250 and 800 nm. The transmittance of 5 mm thickness is above 80%. When the wavelength is shorter than 250 nm, the light absorption rate of both increases rapidly. In particular, tap water absorbs light <250 nm more strongly. 2.4cm attenuation to 70%; 8.5cm attenuation to 30%; 16.3cm attenuation to 10%.
On the basis of the topic of effective distance, how far is the penetration distance of UVC ultraviolet rays in water? Everything is back to the concept of bond energy. In water molecules, the bond energy of the H-O bond is 485kJ/mol, which corresponds to 4.98eV, which is about 249nm. Therefore, when testing the transmission spectrum of pure water, the measured absorption edge starts to drop at about 249nm. Based on this data, it can be said that normal tap water with relatively few impurities in drinking water does not have strong absorption of 275 nm UVC-LED. The ultraviolet sterilization device based on the principle of UVC sterilization can kill a long distance.
The most important consideration is that it should be the rapid divergence of light in the propagation process, resulting in a sharp drop in the far-end intensity. In fact, hemispherical small-angle packaging is very common in the UVA industry. The same applies to UVC packaging. The small-angle light can make UVC spread farther. It is very suitable for manufacturers such as water cups, long water tanks, and overflow water sterilization devices.
High ambient humidity does not cause significant absorption of UVC, which means that even in the sauna room, UVC ultraviolet rays can be used for real-time sterilization.
265nm UVC LED 6565 6868 4W 8W for sterilizer package size:
265nm UVC LED 6565 6868 4W 8W for sterilizer application
About Guangmai LED/ GMKJ LED
Datasheet:
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You can download the English Version datasheet of 265nm UVC LED 6565 6868 4W 8W for sterilizer from the head of this page.
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