My iPhone screen is completely black but it's on

My phone screen is completely black but my phone is on and I can hear it get alerts it can still get calls the screen is just blank. This happened yesterday while i was actively using it the screen started to fade out and turn green before it just suddenly went black and it has not come back on yet. I have work information that I need and this has just been a big inconvenience

[Re-Titled by Moderator]