LED light source using filter with dual-function of stopping ultraviolet rays and infrared rays
A technology of LED light source and optical filter, which is applied in the field of optical filtration, can solve the problems of no filtering, etc., and achieve the effects of simple preparation method, reduction of light radiation hazards, and high ultraviolet cut-off rate
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Embodiment 1
[0051] see figure 1 , an LED device 1, in which an LED chip 11 is packaged, and an optical filter 2 is located above the LED chip 11 and fixed.
[0052] When working, the light emitted by the LED chip 11 must pass through the optical filter 2 before it can be emitted to the outside. The optical filter 2 filters the light emitted by the LED chip within the range of wavelengths less than 445nm and greater than 700nm.
[0053] LED chip 11 can choose any desired emission wavelength, such as green light with a dominant wavelength of 530nm, or red light with a dominant wavelength of 620nm; another example is blue light with a dominant wavelength of 460nm, and mix a certain proportion in the potting glue YAG powder, the blue light emitted by the LED chip excites the YAG powder, and finally obtains white light with a color temperature of 8000K or other required color temperatures.
[0054] The preparation of the optical filter with dual functions of cutting off ultraviolet rays and i...
Embodiment 2
[0066] It is basically the same as Example 1, the difference is the preparation of the optical filter. Firstly, the inner layer film is deposited by electron beam evaporation on the transparent substrate with the silicon target and the tantalum pentoxide target. On this basis, the titanium oxide -The cerium oxide target is subjected to electron beam evaporation to coat the outer film to obtain the product.
Embodiment 3
[0068] Basically the same as Embodiment 1, the difference is that the optical filter is formed into a circular lens surface by a transparent substrate, such as figure 2 shown; or shaped into a square lens surface, and then cleaned and coated.
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