A lot of new work are in arxiv.org. So if you search arxiv for deep learning, you will find it there.
Also one of the places you can find relevant work is by following NIPS (https://nips.cc/) proceedings. Most of the novel work in CS are presented in conferences unlike other engineering disciplines.
Most of the Machine Learning journals would be good. IEEE PAMI, IEEE transaction on Neural Networks , Neural Networks Journals are good places to try (I myself is targetting one of these :-)). You may target, application / domain based journals depending upon your implementations (like in my case am implementing on Bio-informatics look for Bioinformatics journal). Impact factor and reputation are crucial aspects.
attached a list of CS journal with impact.
Research Journal Ranking based on Impact Factor, 2017 (Computer Scien...