transparent with smooth edges ?

i have something like this as a opacity mask, if i apply this to the model it looks like this.

it doesn’t display smoothness on the edges,

and if i use a Translucent it looks okay on the preview

but if i put it on the map, it’s glowing, even though there’s any kind of light inside of it.

what should I do to get a nice transparent with smooth edges that works with proper lighting ?, i tried using “Dither Temporal AA node” on masked blend mode but it looks too noizey to use it.