In general, REE minerals tend to be fluorescent. In our lab we deal a lot with REE and we have a UV lamp just for fun, to see the colours. Other minerals that are commonly associated with REE deposits are also fluorescent, with the best example being calcite, fluorite, and apatite.
The fluorescent properties of REE-bearing solid state ...
I think the answer to your question have to be no.
Lots of minerals are fluorescent in UV light,You can take a look here https://geology.com/articles/fluorescent-minerals/
So as you can see in the linked summary of fluorescent minerals it can be hard to tell what you have found unless you know what to look for.
A better way to find Rare Earth Elements ...