Guangya Exhibition this year, a very obvious feature is the major LED manufacturers of light quality, vigorously into the special application of lighting and color segments of the scene, you can see a lot of related products launched today to talk about some related products, behind about some tall on the propaganda language technology.
1, enhance the whiteness of LED pictured above from the perspective of phenomenon, whitening LED lamp can make white clothes look more white, its principle is to use the fluorescent effect; general white objects including white dress, white all contain fluorescent whitening agent, fluorescent whitening agent is a kind of invisible ultraviolet absorption, a chemical emission of visible light the common absorption peak wavelength is 370 + 20nm, the maximum emission peak wavelength is 440 + 20nm. as shown in the figure, the output 440nm can compensate the white matter in shades of blue yellow, which makes the products appear More white, more bright white LED; general blue chip 460nm stimulate the yellow phosphor, fluorescent effect and 460nm obviously can not stimulate the fluorescent whitening agent, fluorescent whitening agent can not play the effect. Therefore, some LED companies launched LED UV excited white light, see typical UV excited white LED spectrum. UV LED peak wavelength is 400-410nm, can realize the effect of fluorescence excitation, whitening effect whitening effect on the market that all LED have adopted this "trick" to achieve a similar effect, this trick is questionable: 1400-410nm UV LED chip is obviously not the best choice, fluorescent whitening agent the best absorption peak wavelength in the vicinity of 370nm, 400-410nm and UV LED is clearly not the maximum fluorescence excitation effect, the relevant manufacturers have tested 385nm, 385nm, 365nm and other UV LED chip 2?, Optimize UV LED chip of the best brightness, so that can maximize the fluorescent effect, and does not cause damage to the human body, the relevant manufacturers have to test it?
