photoluminescence is the process that a material/compound shows emisson of UV/Vis /NIRlight after it absorbed light

Fluorescence is one of the forms of the emission of light

see wikipedia: however, some of the explanations are not good there!

Why do you want to know this

Fluorescence is a photoluminescence where both the excited and ground states involved have same spin multiplicity (deltaS=0). So all fluorescence is photoluminescence but all photoluminescence are not fluorescence. Organic molecule exhibits fluorescence (or phosphorescence). But heavy metal complexes or materials (perovskite) do not have pure spin (due to spin orbit coupling) so we call their emission photoluminescence or simply luminescence.

Thanks Sir.

Thanks Brink sir.

I need some knowledge of this as I have a paper communicated in RSC in which one of the reviewers put a query regarding the difference in the origins of Fluorescence and Photoluminescence. Upto my knowledge Fluorescence is fast type of Photoluminescence.

As dr Khan indicates

It depends on the compound and discipline whether the process is called PL or rather fluorescence

Thanks to both of you (Brink Sir and Khan Sir) for this information.