There is no such thing as a 220V LED though. All LEDs work at voltages WELL bellow that, if you have an LED that works on 220V it has a resistor inline with it which drops the rest of the voltage to a safe level so that it can run off the 220V, or some other kind of current limiter.
You didn't answer my question, you have digital I/O control already, why are you trying to power the LED via 220v? Just power it from the digital I/O power supply, which in general should be high enough. Then you just turn the Dgitial I/O line on when you want the LED to be on, so the blinking is all done is software and can be controlled anyway you want.