The 3-0 triumph sees the Gunners reach the quarterfinals 4-3 on aggregate.
Emery stated: "It was a good evening. 3-0 is good for us.
"We had chances to score the fourth goal and be more calm. I'm very proud of the supporters and players. We worked very well this week. We can be happy.
"We were very competitive over 90 minutes but can do better. We could have had more control of the ball. It's easy to say here instead of on the pitch."