It's hard to tell because the pic is blurry but I think what you're looking for is a high density print?
One of the ways to achieve this is by creating a thicker stencil by layering your emulsion on the screen. Let the first 2 coats dry then add more passes of emulsion. Repeat until you get a good thick layer of emulsion, and increase your exposure time accordingly
You can also look into high density base or puff additive