Finally, we reach the MacGyver hack. Could a smartphone's LED flash be used to create a UV light? The answer is perhaps. You must comprehend the operation of an LED in order to comprehend this hack. The Light Emitting Diode is a solid state diode, which it is in fact. Similar to excited electrons in a neon gas tube (you've seen these neon signs), the LED emits light. The excited electrons in neon light, however, alter energy levels at the atomic level. In a solid state material, the electrons in an LED shift energy levels. Actually, it is the sole distinction. However, this implies that the value of this energy transition determines the frequency of light generated by an LED. There is just one transition, and as a result, only one type of light.
So how does one create a white LED light? Now that they are widespread, how do they function? Undoubtedly, you could purchase red, green, and blue LEDs and combine them to create white light, but that isn't how most of them function. An ultraviolet or violet LED with fluorescent material, on the other hand, makes up a white LED. The material fluoresces to create different hues (lower frequency) when exposed to the high frequency light that the LED emits (either violet or UV).
Given the inefficiency of this fluorescent material, some UV light could get through and combine with the white light. Simply block the visible colors while allowing the UV light to flow through if you wish to use a white LED to generate UV light. Some substances, such as fluorite or fused quartz, do just that and may be utilized to create some really amazing UV images. However, are there any alternative materials that could work? Maybe. In the MacGyver episode, he utilizes the 3.5-inch disk's floppy disk portion (nowadays, youngsters just refer to this as a "save icon"). Different floppy disks are made of various materials, and this circular disk could let UV light through while blocking visible light.
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Let's take a short look back. Here's how you use a smartphone to create a UV light.
To begin, pick up a smartphone with an LED flash for the camera. You require this light for two purposes. It should firstly be a UV LED made of fluorescent material, and it shouldn't be 100% efficient.
Find a substance that filters UV radiation but not visible light next; this step could take some trial and error.
Cut the lights off. Why? If you don't, certain objects that you want to look at will still glow under UV light, but you won't be able to know because of all the other visible light that will be reflected off the objects.
This is obviously not going to work with just any light or substance, but it is at least conceivable.
