Driving LED with an N-Channel MOSFET
The problem is most likely that the mosfet does not have enough voltage to fully turn on. Vgs is probably not high enough. I couldn't find the datasheet for the CMPD7002 (or any part named that). First make sure the Vgs will give you enough current, find how much Vgs you need for the Rds on. You'll need to do one or more of these things:

1) If the GPIO's on the microcontroller are 3.3V tolerant (or if 3.3V is fine with a pull down) Then use open drain on the GPIO and a pull up to 3.3V

2) Use a circuit or buffer to translate 1.8 to 3.3V

3) Select a different mosfet that turns on at 1.8V and has a low rdson at 1.8V.

4) Calculate the current vs LED drop and size R1 correctly.