A new Eu(III) complex [Eu(tta)3DPA][1] (tta = 2-Thenoyltrifluoroacetone and DPA = 2,2′-Dipyridylamine) has been synthesized and characterized by analytical and spectroscopic techniques. Photoluminescence (PL) properties of [Eu(tta)3DPA] were determined in the solid state and in a range of solvents to understaand the effect of high energy oscillators on the PL and the results were correlated to radiative (AR) and non-radiative (ANR) decay rates. The theoretical values are in good agreement with the experimental results. A flexible transparent thin film was developed by embedding [Eu(tta)3DPA] into poly(urethane)(PU) polymer, PU@[Eu(tta)3DPA]. PL studies of the hybrid material displayed typical monochromatic emission identical to that of [Eu(tta)3DPA]. Thermal stability, photostability (under UV radiation) and Laser properties of [Eu(tta)3DPA] and PU@[Eu(tta)3DPA] were also investigated.

Acknowledgements:

MSK acknowledges His Majesty's Trust Fund for Strategic Research (Grant No. SR/SQU/SCI/CHEM/21/01) and The Ministry of Higher Education, Research and Innovation (MoHERI), Oman (Grant No: RC/RG-SCI/CHEM/22/01) for funding.

References:

[1] R. Ilmi, S. Anjum, A. Haque, M.S. Khan, J. Photochem. Photobiol., A, 383 (2019) 111968.