Is it safe to use a one minute UV light to kill germs on the iPhone?

Hello Dolly8figure and welcome to Apple Support Communities.

I see you have a question about cleaning your iPhone.

You'll find the officially-sanctioned methods for cleaning here:

Cleaning your iPhone - Apple Support

Apple does not publish any info on using UV light to disinfect their devices.

Cheers.

It is not safe to use UV light sterilization with any device using an OLED display. UV light damages OLED displays.