IMO it was a really bad time to bluff -- and yeah, I'm late since we saw the answer -- but if a flush doesn't get there then I always look for a bluffer -- because that's the donk's bluff -- the busted flush bluff.
With your bluff, if I'm villain...well if I'm villain I'm not in that position with QJ. But if I'm villain with AQ and I think I was ahead on the turn, I still believe I am ahead on the river. There's nothing that 2 did for you. And you had to runner runner the straight AND do it with the 4. I just don't see it.
Now if you bluffed me on the turn...I'm gone.