To investigate the potential applications of graphene/Eu-organic heterostructures in photonics and imaging, we studied the Photoluminescence (PL) signal, and its lifetime, as well as the effects of the laser irradiation dose on these properties. Micro-PL spectra collected from different areas of the sample after 100 ALD/MLD cycles of Eu-BDC upon 532 nm laser excitation (Figure ) revealed four characteristic PL peaks of Eu 3+ located at ≈579 nm, ≈592 nm, ≈612 nm (the most intense and sharp red emission line), and ≈652 nm for Eu-BDC on SiO2 and TPO graphene. For pristine graphene with minimal Eu-BDC deposition, only the peaks at ≈579 nm and ≈612 nm were visible due to the small amount of PL material.