[Differentiated fluorescence centers in europium acetylacetonate hydrate doped poly methyl methacrylate]

Poly methyl methacrylate (PMMA) was doped with europium acetylacetonate hydrate. Judd-Ofelt parameters Ω2 (19.73 x 10(-20) cm2) and Ω4(2.19 x 10(-20) cm2) indicate a high inversion asymmetry and strong covalent environment arounc Eu3+ in PMMA. The maximum stimulated emission cross-sections for the 5D0 --> 7F(J); (J = l, 2 and 4) transitions in EAH doped PMMA were calculated to be 0.38 x 10(-21), 4.90 x 10(-21) and 0.36 x 10(-21) cm2, respectively. Efficient purplish-red and red fluorescence was obtained from ediropium acetylacetonate hydrate doped PMMA under 365 and 254 nm excitation respectively, indicating that it can be used as UV sensitive components for fiber optic sensors. Because of the suitable refractive index difference between doped sample and pure PMMA, it is expected to fabricate standard 9 μm/125 μm optical fiber which supports multimode transmission, providing basis of further development for medical fiber, flexible communication fiber and fiber optic sensor.