The normal disinfection and sterilization was described.
There are heat sterilization,sterilization by ultraviolet rays irradiation and chemical agent disinfection. 

Heat sterilization will takes a long time. The temperature is too high,we need someone to watch it all the time.
For chemical agent disinfection,there are cracks can’t be cleaned properly, and some cannot touch the liquid like our mobile phone screen can be easily corroded by chemical agent disinfection.
We recommend ultraviolet rays irradiation now.
Easy and quick sterilization
low energy consumption
Compact and lightweight
No damage to the item
Where the light strikes, the bacteria disappear，
Eliminate clean bacteria

UV light causes the body to produce vitamin D (specifically, UVB), which is essential for life. The human body needs some UV radiation to maintain adequate vitamin D levels;
Vitamin D promotes the creation of serotonin. The production of serotonin is in direct proportion to the degree of bright sunlight the body receives. Serotonin is thought to provide sensations of happiness, well being and serenity to human beings.

— World Health Organization