What is the use of UV LEDs in my fridge?
Yes, the UV light will make your fruit and vegetables last longer.  Really it depends on the wavelength of UV. 275nm is used for killing bacteria and will burn your retinas, 385nm is less harsh to the skin or eyes and will still kill bacteria to a degree.  

I just read a study in which they used 285nm in a controlled refrigerator setting against a static test with no UV on strawberries and how long they would stay fresh.  The UV irradiated strawberries lasted 9 days without growing mold.  The non uv, started growing mold all over them by 9 days. They tested the nutritional content of each and the UV treated had a higher content of nutrition then the non uv.